CN118564207A - Intelligent control liner hanger and use method thereof - Google Patents

Abstract

The invention provides an intelligent control liner hanger, which comprises: a liner hanger unit including a seat-hanging mechanism; the running tool is used for running the liner hanger unit into a well and comprises a sitting and hanging driving unit, a hydraulic releasing unit and an intelligent hydraulic control system arranged between the sitting and hanging driving unit and the axial direction of the hydraulic releasing unit; the intelligent hydraulic control system comprises a core assembly, a circuit unit and a hydraulic assembly, wherein the core assembly can receive signals transmitted by a wellhead and transmit the signals to the circuit unit so as to identify a sitting and hanging instruction or a releasing instruction and send the sitting and hanging instruction to the hydraulic assembly, and the hydraulic assembly can output high-pressure oil to the sitting and hanging driving unit according to the sitting and hanging instruction so as to drive the sitting and hanging mechanism to realize sitting and hanging actions, or output high-pressure oil to the hydraulic releasing unit according to the releasing instruction so as to realize releasing actions. The invention also provides a use method of the intelligent control liner hanger.

Description

Intelligent control liner hanger and use method thereof

Technical Field

The invention belongs to the technical field of downhole tools for well completion of oil and gas wells. In particular to an intelligent control liner hanger and a use method thereof.

Background

Along with the continuous challenges of global exploration and development technology to exploration directions such as deep layers, deep water and the like, part of blocks begin to adopt a liner cementing and then tieback non-cementing segmented fracturing well completion integrated process, and the high-temperature, high-pressure, high-sulfur and other complex environments in the pit provide higher and higher requirements for pressure resistance and long-acting sealing of liner cementing tools. The higher fracturing construction pressure in the later stage brings new test to the whole machine pressure-resistant capacity of the tail pipe hanger. Meanwhile, because of the large-scale construction of national strategic energy gas storages and the like, the gas storage wells have high dependence on the integrity of the shaft due to the characteristics of strong injection, strong production and long service life. Most of the domestic existing liner hangers integrate a power hydraulic cylinder in a hanger unit, and the power hydraulic cylinder is left underground along with a liner after well cementation, so that the elastomer sealing element at the power hydraulic cylinder has risks of ageing, sealing failure and leakage, and the ring air channeling can be caused if the elastomer sealing element is light, so that serious major accidents such as blowout, single well rejection and the like can occur.

In addition, the control modes of the existing liner hanger are mainly mechanical and hydraulic modes, and certain application limitations exist, for example, in deep wells, horizontal wells and large-displacement wells, the mechanical liner hanger cannot well judge the action condition of a tool due to the limitations of the control modes of the mechanical liner hanger. The hydraulic tail pipe hanger has the ball seat leakage, so that the hydraulic tail pipe hanger cannot be pressed, the sitting and hanging actions cannot be realized, the instantaneous surge pressure during the later ball seat is blocked, the risk of damaging the bottom layer of the naked eye exists, and meanwhile, the risk of blocking pressure transmission holes and failing sitting and hanging exists under the high-specific-gravity slurry environment. In recent years, the development force of unconventional oil and gas resources is continuously increased, large-displacement wells and horizontal wells are continuously emerging, and the phenomenon that a pipe string is difficult to put down or is not in place is more and more.

At present, the well cementing tool in China is still in a mechanical control stage, the intelligent level is low, and a new breakthrough in the aspect of intelligent well cementation is needed to be made so as to shorten the gap between the well cementing tool and foreign products of the same type.

Disclosure of Invention

Aiming at the technical problems, the invention aims to provide the intelligent control liner hanger which moves the power unit of the liner hanger to the running tool, eliminates the weak links of the liner hanger unit in the prior art, ensures the long-acting sealing of the liner hanger and the integrity of a liner shaft, integrates the hydraulic releasing unit, can realize infinite displacement circulation and rotary running of a liner string, and can effectively ensure the running reliability.

To this end, according to a first aspect of the present invention, there is provided an intelligent control liner hanger comprising: a liner hanger unit including a seat-hanging mechanism; the running tool is used for running the liner hanger unit into a well and comprises a sitting and hanging driving unit, a hydraulic releasing unit and an intelligent hydraulic control system arranged between the sitting and hanging driving unit and the axial direction of the hydraulic releasing unit; the intelligent hydraulic control system comprises a core assembly, a circuit unit and a hydraulic assembly, wherein the core assembly can receive signals transmitted by a wellhead and transmit the signals to the circuit unit so as to identify a sitting and hanging instruction or a releasing instruction and send the sitting and hanging instruction to the hydraulic assembly, and the hydraulic assembly can output high-pressure oil to the sitting and hanging driving unit according to the sitting and hanging instruction so as to drive the sitting and hanging mechanism to realize sitting and hanging actions, or output high-pressure oil to the hydraulic releasing unit according to the releasing instruction so as to realize releasing actions.

In one embodiment, the hydraulic assembly includes a hydraulic pump and a hydraulic motor in signal connection with the circuit unit, respectively, the hydraulic pump and the hydraulic motor pumping high pressure oil according to the instructions identified by the circuit unit.

In one embodiment, the cartridge assembly includes a coil configured to receive a wireless electromagnetic signal emitted from a wireless magnet ball throw delivered from a wellhead to the intelligent hydraulic control system and to pass to the circuit unit.

In one embodiment, the cartridge assembly further comprises a vibration sensor configured to receive a pulse signal emitted from the wellhead and to communicate to the circuit unit.

In one embodiment, the cartridge assembly further comprises an acoustic wave receiving device configured to receive an acoustic wave signal emitted from the wellhead and pass it to the circuit unit.

In one embodiment, the intelligent hydraulic control system further comprises a tubular mounting body, a battery assembly for supplying power and an oil bag assembly for storing hydraulic oil, wherein a plurality of mounting grooves which are circumferentially distributed at intervals are formed in the outer wall of the tubular mounting body, and the movement assembly, the circuit unit, the hydraulic assembly and the battery assembly and the oil bag assembly are respectively mounted in the corresponding mounting grooves.

In one embodiment, the liner hanger unit further comprises a cylindrical body, the seat hanging mechanism is sleeved on the cylindrical body, and a clamping groove is formed in the inner wall of the upper end of the cylindrical body and used for being connected with the hydraulic releasing unit.

In one embodiment, the setting mechanism includes a slip assembly, and the setting drive unit is capable of generating a setting thrust force to drive the slip assembly radially expanded against the wellbore casing to complete setting.

In one embodiment, the running tool further comprises a first base pipe, and the seat-hanging driving unit is sleeved on the first base pipe.

In one embodiment, the hitch drive unit includes: the piston is sleeved on the first central tube; a plug cap fixedly connected with the piston; a sitting and hanging hydraulic cylinder sleeved on the first central pipe; and a tieback barrel for transmitting setting thrust, disposed between the setting plug cap and the slip assembly; the hydraulic system comprises a hydraulic assembly, a piston cavity, a piston cap, a tie-back cylinder, a slip assembly, a tie-back cylinder, a slip sleeve, a piston cavity, a piston part, a piston cap and a tie-back cylinder, wherein the piston cavity is formed between the hydraulic assembly and the first central tube, the piston part is formed at the lower end of the piston, the piston part is arranged in the piston cavity, and the piston can descend under the action of high-pressure oil pumped by the hydraulic assembly through the piston part to generate a tie-back thrust, and is transmitted to the slip assembly through the plug cap and the tie-back cylinder.

In one embodiment, a first liquid transmission channel is arranged in the wall of the sitting and hanging liquid cylinder, and a liquid cavity corresponding to the upper end of the piston part in the piston cavity is communicated with the hydraulic assembly through the first liquid transmission channel.

In one embodiment, an anti-advance sitting and hanging component is arranged at the upper end of the tieback cylinder and used for preventing the sitting and hanging mechanism from sitting and hanging in advance.

In one embodiment, the hydraulic release unit comprises: a hollow mandrel; a spring claw sleeved on the hollow mandrel; the releasing hydraulic cylinder is sleeved on the hollow mandrel, is connected with the hollow mandrel through a releasing shear pin and is positioned between the claw part of the spring claw and the hollow mandrel; the clamping claw portion is matched with the clamping groove of the cylindrical body in an initial state, so that the tail pipe hanger unit is connected with the hydraulic releasing unit, the releasing hydraulic cylinder can shear the releasing shear pin under the action of high-pressure oil pumped by the hydraulic assembly and drive the spring claw to ascend, and the clamping claw portion is separated from the clamping groove, so that releasing action is achieved.

In one embodiment, a second liquid transfer channel is arranged in the wall of the hollow mandrel and used for communicating the releasing hydraulic cylinder with the hydraulic assembly.

According to a second aspect of the present invention there is also provided a method of using an intelligent control liner hanger as described above, comprising the steps of:

The intelligent control tail pipe hanger is assembled, connected with an upper drilling tool and a lower tail pipe string respectively, and is lowered into a shaft to a preset position;

Transmitting a sitting and hanging control signal from a wellhead, transmitting the sitting and hanging control signal to the circuit unit after receiving the sitting and hanging control signal by the core assembly so as to identify a sitting and hanging instruction and transmitting the sitting and hanging instruction to the hydraulic assembly, and outputting high-pressure oil to the sitting and hanging driving unit by the hydraulic assembly according to the sitting and hanging instruction so as to drive the sitting and hanging mechanism to realize sitting and hanging actions;

After the sitting and hanging are finished, transmitting a releasing control signal from a wellhead, and transmitting the releasing control signal to the circuit unit after receiving the releasing control signal by the core assembly so as to identify a releasing instruction and transmit the releasing instruction to the hydraulic assembly, wherein the hydraulic assembly outputs high-pressure oil to the hydraulic releasing unit according to the releasing instruction so as to realize releasing action;

And (3) providing the running tool, and transferring the running tool into a conventional tail pipe to perform well cementation operation.

Compared with the prior art, the application has the advantages that:

According to the intelligent control tail pipe hanger, through the design of the integral type tail pipe hanger unit, weak links such as pressure transmission holes and hydraulic cylinders are avoided, the long-term pressure resistance and sealing capacity of the integral tool are improved, the integrity of a shaft is guaranteed, risks such as ring air channeling and blowout are avoided, the integrity of the tail pipe shaft is guaranteed, and production operation requirements such as high temperature, high pressure and gas storage wells are met. The intelligent control liner hanger and the inner and outer annular spaces of the pipe column are not provided with pressure transmission channels, so that the height of the pressure inside and outside the pipe column can not influence the sitting and hanging action of the liner hanger unit, infinite displacement circulation of slurry in the liner lowering process can be realized, and the lowering reliability of a complex well, a long horizontal well or a large displacement well is ensured. Meanwhile, through the integrated hydraulic releasing unit and the torque tooth structure, rotary running of the tail pipe string can be realized, running reliability of the tail pipe string is guaranteed, and safe and rapid running of the tail pipe string to a design position is guaranteed. The intelligent hydraulic control system adopts three signal excitation modes of mud pulse, wireless electromagnetic or acoustic wave, can be arbitrarily combined according to the well condition, has strong applicability to complex well conditions, and improves the use reliability of tools. The intelligent hydraulic control system can be lifted out of a wellhead along with a drilling tool after construction is finished, and the purpose of reducing cost and enhancing efficiency is achieved after maintenance. In addition, the upper end of the tieback cylinder is provided with an anti-advance sitting and hanging assembly, so that the phenomenon that the tailpipe hanger unit is sitting and hanging in advance due to collision of the tieback cylinder in the process of descending the tailpipe hanger unit is prevented.

Drawings

The present invention will be described below with reference to the accompanying drawings.

Fig. 1 schematically shows the structure of an intelligent control liner hanger according to the present invention.

Fig. 2 schematically shows the configuration of the setting tool in the intelligent control liner hanger of fig. 1.

Fig. 3 schematically illustrates the construction of a liner hanger unit in the intelligent control liner hanger of fig. 1.

Fig. 4 is an enlarged view of region C in fig. 1.

Fig. 5 schematically illustrates the configuration of the extension pipe in the intelligent control liner hanger of fig. 1.

Fig. 6 schematically shows the construction of a hydraulic release unit in the intelligent control liner hanger of fig. 1.

Fig. 7 schematically shows the external configuration of the intelligent hydraulic control system in the intelligent control liner hanger of fig. 1.

Fig. 8 schematically shows the external structure from a relative perspective to the intelligent hydraulic control system shown in fig. 7.

Fig. 9 is a cross-sectional view taken along line A-A of fig. 7.

Fig. 10 schematically illustrates the external structure of the intelligent hydraulic control system of fig. 7 rotated 90 degrees.

Fig. 11 schematically illustrates the external structure from a relative perspective to the intelligent hydraulic control system shown in fig. 10.

Fig. 12 is a cross-sectional view taken along line B-B of fig. 10.

In the present application, all of the figures are schematic drawings which are intended to illustrate the principles of the application only and are not to scale.

Detailed Description

The invention is described below with reference to the accompanying drawings.

For ease of understanding, in the present application, the end closer to the wellhead is defined as the upper end, upstream end or the like, and the end farther from the wellhead is defined as the lower end, downstream end or the like. Meanwhile, a longitudinal direction along the length of the intelligent control liner hanger is referred to as a longitudinal direction, an axial direction, or the like, and a direction perpendicular thereto is referred to as a lateral direction, a radial direction, or the like.

It is further noted that the directional terms or qualifiers "upper", "lower", etc. used in the present application are used with respect to fig. 1 to be referred to for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the application.

Fig. 1 schematically shows the structure of an intelligent control liner hanger 100 in accordance with the present invention. As shown in fig. 1, the intelligent control liner hanger 100 includes a running tool and liner hanger unit 3. The running tool 1 is used for running a liner hanger unit 3 into a predetermined position downhole, and comprises a setting drive unit 11, a hydraulic release unit 12, and an intelligent hydraulic control system 13 arranged between the setting drive unit 11 and the axial direction of the hydraulic release unit 12, the intelligent hydraulic control system 13 being used for controlling the setting drive unit 11 and the hydraulic release unit 12. The liner hanger unit 3 includes a hanger mechanism 31, and the hanger driving unit 11 is used for driving the hanger mechanism 31 to hanger. The intelligent hydraulic control system 13 comprises a core assembly 131, a circuit unit 132 (see fig. 12) and a hydraulic assembly 133 (see fig. 9), wherein the core assembly 131 can receive signals emitted by a wellhead and transmit the signals to the circuit unit 132 so as to identify a sitting and hanging instruction or a releasing instruction and transmit the instructions to the hydraulic assembly 133, the hydraulic assembly 133 can output high-pressure oil to the sitting and hanging driving unit 11 according to the sitting and hanging instruction so as to drive the sitting and hanging mechanism 31 to realize sitting and hanging actions, or the hydraulic assembly 133 can output high-pressure oil to the hydraulic releasing unit 12 according to the releasing instruction so as to drive the hydraulic releasing unit 12 to realize releasing actions.

The setting tool 1 serves as a means for performing a setting and releasing operation of the liner hanger unit 3. Fig. 2 schematically shows the construction of the running tool 1, and as shown in fig. 2, the running tool 1 further comprises a first central tube 14, and the setting drive unit 11 is sleeved on the first central tube 14. At the upper end of the first central tube 14 a pull-up joint 101 is provided for connection with an upper drill. The intelligent hydraulic control system 13 is connected to the lower end of the first central pipe 14, and the hydraulic release unit 12 is connected to the lower end of the intelligent hydraulic control system 13. The liner hanger unit 3 can be adapted to be connected to the lower end of the hydraulic release unit 12.

In addition, the running tool 1 further includes a second center pipe 107, as shown in fig. 2, the upper end of the second center pipe 107 is fixedly connected to the hydraulic release unit 12, and the lower end extends downward. In the unreleased state, the second base pipe 107 passes through the liner hanger unit 3.

As shown in fig. 3, the liner hanger unit 3 further includes a tubular body 32, the seat-hanging mechanism 31 is sleeved on the tubular body 32, and a clamping groove 321 is provided on an inner wall of an upper end of the tubular body 32 for adapting connection with the hydraulic release unit 12. The setting mechanism 31 includes a slip assembly including, for example, a cone, a slip sleeve, etc. The setting drive unit 11 is capable of generating a setting thrust to drive the slip assemblies radially expanded against the wellbore casing to complete the setting.

In one embodiment, a first centering ring 102 (see FIG. 2) is provided near the upper end of the running tool 1. Meanwhile, a second centralizer ring 36 (see fig. 3) is provided on the tubular body 32 of the liner hanger unit 3, the second centralizer ring 36 being in a position below the slip assembly. The first centering ring 102 and the second centering ring 36 are capable of effectively centering the intelligent control liner hanger 100 during running, thereby ensuring that the intelligent control liner hanger 100 is centered and improving running efficiency. Preferably, a plurality of spaced apart second centralizers 36 may be provided on the tubular body 32 such that the liner hanger unit 3 can be centralized by the second centralizers 36 during subsequent operations after release.

According to the present invention, as shown in fig. 1 and 4, the seat-hanging driving unit 11 includes a piston 111 sleeved on the first central tube 14, a seat-hanging plug cap 112 fixedly connected with the piston 111, a seat-hanging hydraulic cylinder 113 sleeved on the first central tube 14, and a tieback cylinder 2 for transmitting a setting thrust. Fig. 5 schematically shows the structure of the tieback tube 2. The tieback cylinder 2 is sleeved outside the first central pipe 14, an annular space is formed between the tieback cylinder and the first central pipe 14, and the piston 111, the plug cap 112 and the hydraulic cylinder 113 are all arranged in the annular space. The tieback barrel 2 is disposed between the setting plug cap 112 and the slip assembly. The lower end of the tieback cylinder 2 is fixedly connected with a force transmission sleeve 35, the force transmission sleeve 35 is used for receiving the tieback cylinder 2 to transmit sitting and hanging thrust, and the sitting and hanging thrust transmitted by the tieback cylinder 2 can act on the slip assembly 31 to enable slips in the slip assembly 31 to expand radially to be clung to a well casing, so that sitting and hanging are completed.

In order to ensure sealing performance, a sealing assembly 34 (see fig. 3) is provided at the junction of the force-transmitting sleeve 35 and the tieback cylinder 2. Further, in order to secure the sealability of the hydraulic release unit 12, a seal core 33 (see fig. 3) is provided between the second center pipe 107 and the cylindrical body 32 of the liner hanger unit 3.

As shown in fig. 4, a piston chamber is formed between the setting hydraulic cylinder 113 and the first central tube 14, a radially protruding piston portion is formed at the lower end of the piston 111, the piston portion is disposed in the piston chamber, and the piston 111 can descend by the piston portion under the action of high pressure oil pumped by the hydraulic assembly 133 to generate a setting thrust, and is transferred to the slip assembly through the plug cap 112 and the tieback cylinder 2. Specifically, a first fluid transfer passage 1130 is provided in the wall of the hydraulic mount cylinder 113, and a fluid chamber 1131 in the piston chamber corresponding to the upper end of the piston portion communicates with a first hydraulic oil delivery passage 133a (see description below) in the hydraulic assembly 133 through the first fluid transfer passage 1130.

According to the present invention, as shown in fig. 2, an advance-preventing seat-hanging assembly 103 is provided at the upper end of the tieback tube 2 for preventing the seat-hanging mechanism 31 from being seated in advance.

As shown in fig. 4, the anti-advance seat-hanging assembly 103 includes a clamping sleeve 21 fixedly connected to the upper end of the tieback tube 2, a positioning sleeve 23 fixedly sleeved on the upper end of the first central tube 14, and a stopper 22. The inner wall of the clamping sleeve 21 is provided with a block groove 211, the positioning sleeve 23 is provided with a through hole penetrating through the side part thereof, in an initial state, the block 22 penetrates through the through hole and is mounted in the block groove 211, and the upper end of the piston 111 extends to the radial inner side of the block 22 to form radial support for the block 22. Thus, the clip positioning is formed on the tieback tube 2 by the stopper 22, and at this time, the seat-hanging mechanism 31 can be effectively prevented from being seated and hung in advance during the process of being lowered into the well.

In addition, a limiting step 212 is formed at the junction of the tieback tube 2 and the snap sleeve 21, and the plug cap 112 is spaced apart from the upper end of the limiting step 212 in the initial state. When the piston 111 descends under the action of high-pressure oil pumped by the hydraulic assembly 133, the piston cap 112 is simultaneously driven to descend to sit on the limit step 212, thereby transmitting the sitting thrust to the tieback cylinder 2. At this time, the upper end of the piston 111 no longer supports the stopper 22, and the locking sleeve 21 receives a downward force, so that the stopper 22 is released from the stopper groove 211, and the stopper 22 loses a limiting effect on the locking sleeve 21. Thereby, the setting driving unit 11 transmits the setting pushing force generated by the piston 111 to the slip assembly through the tieback cylinder 2, and thus the setting mechanism 31 is set.

According to the present invention, as shown in fig. 6, the hydraulic release unit 12 includes a hollow mandrel 121, a spring claw 122 sleeved on the hollow mandrel 121, and a release hydraulic cylinder 123 sleeved on the hollow mandrel 121, the release hydraulic cylinder 123 being connected to the hollow mandrel 121 by a release shear pin 124 and being located between a claw portion 1220 of the spring claw 122 and the hollow mandrel 121. Wherein the claw portion 1220 is fitted with the catching groove 321 of the tubular body 32 of the liner hanger unit 3 in an initial state, thereby connecting the liner hanger unit 3 with the hydraulic release unit 12. And, the releasing hydraulic cylinder 123 can shear the releasing shear pin 124 under the action of the high-pressure oil pumped by the hydraulic assembly 133, and drives the spring claw 122 to move upwards, so that the claw portion 1220 is separated from the clamping groove 321, and releasing action is realized.

In one embodiment, the release cylinder 123 is configured as a cylinder that fits over the hollow mandrel 121 with its inner wall provided with a step facing downward, while a seal assembly 1230 is provided between the release cylinder 123 and the hollow mandrel 121. Thereby, a relief hydraulic chamber is formed between the step and the seal assembly 1230. The intelligent hydraulic control system 13 can pump high-pressure oil to the releasing hydraulic chamber to drive the hydraulic releasing unit 12 to realize releasing.

As shown in fig. 6, a second fluid transfer channel 125 is provided in the wall of the hollow mandrel 121 for communicating the release cylinder 124 with the hydraulic assembly 133. Specifically, one end of the second hydraulic fluid passage 125 communicates with the release hydraulic chamber, and the other end communicates with a second hydraulic fluid delivery passage 133b (see fig. 9). The second hydraulic oil delivery passage 133b will be described later.

In addition, the hydraulic release unit 12 further includes a torque sleeve 126 and a connection fitting 127 connected to the lower end of the hollow mandrel 121. The torque teeth are respectively arranged at two ends of the torque sleeve 126, the upper end of the torque sleeve 126 is connected with corresponding torque teeth arranged at the lower end of the installation main body 5 in the intelligent hydraulic control system 13 in an adaptive manner through the torque teeth, and the lower end of the torque sleeve 126 is connected with corresponding torque teeth arranged at the upper end of the tubular body 32 of the tail pipe hanger unit 3 in an adaptive manner through the torque teeth. Therefore, through integrating the hydraulic releasing unit 12 and the torque tooth structure, the rotary running-in of the tail pipe string can be realized, and the running-in reliability of the tail pipe string is effectively ensured.

Fig. 7 to 12 schematically show the structure of the intelligent hydraulic control system 13. The hydraulic assembly 133 includes a hydraulic pump and a hydraulic motor, which are respectively in signal connection with the circuit unit 132, and pump high-pressure oil according to instructions recognized by the circuit unit 132.

According to one embodiment of the present invention, as shown in fig. 12, the movement assembly 131 includes a coil 1311, the coil 1311 being configured to receive a wireless electromagnetic signal emitted from a wellhead to the wireless magnet pitch 4 at the intelligent hydraulic control system 13 and to pass to the circuit unit 132 in signal connection with the coil 1311, thereby activating the circuit unit 132. At this time, the circuit unit 132 may control the operation of the hydraulic assembly 133 in response to the coil 1311 receiving the corresponding wireless electromagnetic signal.

According to one embodiment of the invention, the movement assembly 131 may further comprise a vibration sensor (not shown) configured to receive the pulse signal emitted by the wellhead and to pass to the circuit unit 132 in signal connection with the vibration sensor, thereby activating the circuit unit 132. At this time, the circuit unit 132 may control the operation of the hydraulic assembly 133 in response to the vibration sensor receiving the corresponding pulse signal.

According to one embodiment of the present invention, the cartridge assembly 131 may further include an acoustic wave receiving device (not shown) configured to receive an acoustic wave signal emitted from the wellhead and to pass to the circuit unit 132 in signal connection with the acoustic wave receiving device, thereby activating the circuit unit 132. At this time, the circuit unit 132 may control the operation of the hydraulic assembly 133 in response to the reception of the corresponding acoustic wave signal by the acoustic wave receiving device.

According to the invention, as shown in fig. 9, the intelligent hydraulic control system 13 further comprises a tubular mounting body 5, a battery assembly 6 for supplying power, and an oil bag assembly 7 for storing hydraulic oil. The battery assembly 6 may power the hydraulic assembly 133, the movement assembly 131, the circuit unit 132, and the like. The intelligent hydraulic control system 13 can control the hydraulic assembly 133 according to the corresponding signal to pump the hydraulic oil in the oil bag assembly 7 to the hitch driving unit 11 or the hydraulic releasing unit 12.

The outer wall of the tubular mounting body 5 is provided with a plurality of mounting grooves which are circumferentially spaced apart, and the movement assembly 131, the circuit unit 132, the hydraulic assembly 133 and the battery assembly 6, and the oil bag assembly 7 are respectively mounted in the corresponding mounting grooves. As shown in fig. 9, the hydraulic assembly 133 and the battery assembly 6 are disposed diametrically opposite each other. As shown in fig. 12, the cartridge assembly 131 and the circuit unit 132 are disposed at the same circumferential position and are disposed radially opposite to the oil bag assembly 7. Preferably, the oil bag assembly 7 includes a small oil bag 71 and a large oil bag 72.

In one embodiment, as shown in fig. 9, in order to ensure the quality of the hydraulic oil, filters 8 may be provided at both axial ends of the hydraulic assembly 133, respectively, and the filters 8 are connected to the first and second hydraulic oil delivery passages 133a and 133b, respectively, for filtering the hydraulic oil.

In order to protect the movement assembly 131, the circuit unit 132, the hydraulic assembly 133, the battery assembly 6, and the oil bag assembly 7, a protective cover plate is correspondingly provided at the corresponding mounting grooves of the movement assembly 131, the circuit unit 132, the hydraulic assembly 133, the battery assembly 6, the oil bag assembly 7, and the filter 8. As shown in fig. 7 and 8, the battery cover 61 is provided outside the battery module 6, the filter cover 81 is provided outside the filter 8, and the hydraulic module cover 1331 is provided outside the hydraulic module 133. As shown in fig. 10 and 11, the outsides of the small oil pocket 71 and the large oil pocket 72 are provided with a small oil pocket cover plate 711 and a large oil pocket cover plate 721, respectively. The deck assembly 131 and the circuit unit 132 are installed in the same installation groove of the tubular installation body 5, and the deck assembly cover 1311 is provided outside the deck assembly 131 and the circuit unit 132, whereby such a structure can form an effective protection for the internal parts of the intelligent hydraulic control system 13, which is very advantageous for improving the service life of the intelligent hydraulic control system 13.

Further, as shown in fig. 12, the tubular mounting body 5 is further provided with a communication plug 134, and the communication plug 134 is signal-connected with the deck assembly 131 and the circuit unit 132. The communication plug 134 corresponds to a switch, and when the communication plug 134 is plugged in, the whole system is in a power supply state, and when the communication plug is not plugged in, the system is in a non-power supply state. To protect the communication plug 134, a communication port cover and a communication socket cover 1341 are provided on the outside of the communication plug 134.

The invention also provides a use method of the intelligent control liner hanger 100, and the use method is described in detail below.

First, the intelligent control liner hanger 100 is assembled, connected to the upper and lower liner strings, respectively, and lowered into the wellbore to a predetermined location. In the process of the discharging, due to the structure of the torque teeth, infinite displacement circulation and rotary discharging of the pipe string can be realized, and the tail pipe is ensured to be safely and smoothly discharged in place.

After the intelligent control liner hanger 100 is lowered to the designed position, a sitting and hanging control signal is emitted from a wellhead, the movement assembly 131 receives the sitting and hanging control signal and then transmits the sitting and hanging control signal to the circuit unit 132 so as to identify a sitting and hanging instruction and transmit the sitting and hanging instruction to the hydraulic assembly 133, and the hydraulic assembly 133 outputs high-pressure oil to the sitting and hanging driving unit 11 according to the sitting and hanging instruction so as to drive the sitting and hanging mechanism 31 to realize sitting and hanging actions.

According to the present invention, the intelligent control of the setting action of the liner hanger 100 may be achieved in three ways. The first sitting and hanging control mode is to use a wireless electromagnetic signal, specifically, after the intelligent control liner hanger 100 is lowered to a designed position, a wireless magnet ball 4 is thrown from a wellhead, the wireless magnet ball 4 emits a wireless electromagnetic signal outwards, when the wireless magnet ball 4 moves to a position of an intelligent hydraulic control system 13, a coil 1311 in a core assembly 131 receives the wireless electromagnetic signal emitted by the wireless magnet ball 4 and transmits the wireless electromagnetic signal to a circuit unit 132 connected with the coil 1311 through a signal, so that the circuit unit 132 is activated. At this time, the circuit unit 132 may issue a sitting and hanging command in response to the coil 1311 receiving a corresponding wireless electromagnetic signal, control the hydraulic assembly 133 to pump high-pressure oil in the oil bag assembly 7 upward through the hydraulic pump and the hydraulic motor, and the high-pressure oil is pumped into the liquid cavity 1131 corresponding to the upper end of the piston portion in the piston cavity of the sitting and hanging driving unit 11 sequentially through the first hydraulic oil conveying channel 133a and the first liquid conveying channel 1130, and along with continuous pumping of the high-pressure oil, the upper end surface of the piston portion is subjected to the hydraulic action of the high-pressure oil so as to make the piston 111 descend and drive the piston cap 112 to descend. Thereby, the stop block 22 is retracted and slipped, so that the piston 111 continues to drive the plug cap 112 to continue to move downwards, and the tieback cylinder 2 is pressed down. The setting thrust generated by the piston 111 is thereby transferred to the tieback cylinder 2 and thus to the slip assembly, causing the setting mechanism 31 to set.

The second sitting and hanging control mode is to use pulse signals, specifically, when the intelligent control tail pipe hanger 100 is lowered to a designed position, a wellhead transmits pulse signals with a certain frequency through a regular start-stop mud pump, a pipe column regularly vibrates, and a vibration sensor on the core assembly 131 transmits the sitting and hanging signals to the circuit unit 132 after receiving the pipe column regular vibration signals, so that the circuit unit 132 is activated. At this time, the circuit unit 132 may issue a seat-hanging instruction in response to the vibration sensor receiving the corresponding pulse signal, and the subsequent actions are the same as the first seat-hanging control manner.

The third sitting and hanging control mode is to utilize an acoustic signal, specifically, when the intelligent control liner hanger 100 is lowered to a designed position, the wellhead transmits the acoustic signal, and after the acoustic signal is received by the acoustic receiving device on the core assembly 131, the sitting and hanging signal is transmitted to the circuit unit 132, so that the circuit unit 132 is activated. At this time, the circuit unit 132 may issue a sitting-hanging instruction in response to the sound wave receiving device receiving the corresponding sound wave signal, and the subsequent actions are the same as the first sitting-hanging control manner.

After the sitting and hanging are finished, a releasing control signal is transmitted from a wellhead, the movement assembly 131 receives the releasing control signal and then transmits the releasing control signal to the circuit unit 132 so as to identify a releasing instruction and transmit the releasing instruction to the hydraulic assembly 133, and the hydraulic assembly 133 outputs high-pressure oil to the hydraulic releasing unit 12 according to the releasing instruction so as to realize releasing action.

Likewise, the intelligent control of the release action of the liner hanger 100 may be accomplished in three ways. The first releasing control mode is to use a wireless electromagnetic signal, specifically, after the intelligent control liner hanger 100 is lowered to a designed position, a wireless magnet ball 4 is thrown from a wellhead, the wireless magnet ball 4 emits a wireless electromagnetic signal outwards, when the wireless magnet ball 4 moves to a position of an intelligent hydraulic control system 13, a coil 1311 in the core assembly 131 receives the wireless electromagnetic signal emitted by the wireless magnet ball 4 and transmits the wireless electromagnetic signal to a circuit unit 132 connected with the coil 1311 through a signal, so that the circuit unit 132 is activated. At this time, the circuit unit 132 may respond to the corresponding wireless electromagnetic signal received by the coil 1311 and issue a releasing instruction, and control the hydraulic assembly 133 to pump the high-pressure oil in the oil bag assembly 7 downward through the hydraulic pump and the hydraulic motor, and the high-pressure oil is pumped into the releasing hydraulic cavity of the hydraulic releasing unit 12 through the second hydraulic oil conveying channel 133b and the second hydraulic oil conveying channel 125 in sequence, and as the high-pressure oil is continuously pumped in, the releasing hydraulic cylinder 123 shears the releasing shear pin 124 under the action of the high-pressure oil and drives the spring claw 122 to move upward, so that the claw portion 1220 is separated from the clamping groove 321, thereby realizing releasing action.

The second mode of releasing control is to use pulse signals, specifically, when the intelligent control tail pipe hanger 100 is lowered to a designed position, the wellhead transmits pulse signals with a certain frequency through the regular start-stop mud pump, the pipe column regularly vibrates, and after the vibration sensor on the core assembly 131 receives the pipe column regularly vibration signals, the releasing signals are transmitted to the circuit unit 132, so that the circuit unit 132 is activated. At this time, the circuit unit 132 may issue a release instruction in response to the vibration sensor receiving the corresponding pulse signal, and the subsequent action is the same as the first release control manner.

The third mode of releasing control is to use the acoustic signal, specifically, when the intelligent control liner hanger 100 is lowered to the designed position, the wellhead transmits the acoustic signal, and after the acoustic signal is received by the acoustic receiving device on the core assembly 131, the releasing signal is transmitted to the circuit unit 132, so that the circuit unit 132 is activated. At this time, the circuit unit 132 may issue a release instruction in response to the acoustic wave receiving device receiving the corresponding acoustic wave signal, and the subsequent action is the same as the first release control manner.

After releasing, the running tool 1 is put forward, and the conventional tail pipe is shifted to perform well cementation operation.

The intelligent control liner hanger 100 according to the invention has the advantages that through the design of the integral liner hanger unit, weak links such as pressure transmission holes and hydraulic cylinders are avoided, the long-term pressure resistance and sealing capability of the whole tool are improved, the integrity of a shaft is ensured, the risks of ring air channeling, blowout and the like are avoided, the integrity of the liner shaft is ensured, and the production operation demands such as high temperature, high pressure, gas storage wells and the like are met. The intelligent control liner hanger 100 and the inner and outer annular spaces of the pipe column are not provided with pressure transmission channels, so that the sitting and hanging actions of the liner hanger unit 3 are not influenced by the pressure inside and outside the pipe column, infinite displacement circulation of slurry in the liner lowering process can be realized, and the lowering reliability of a complex well, a long horizontal well or a large displacement well is ensured. Meanwhile, through the integrated hydraulic releasing unit 12 and the torque tooth structure, rotary running of the tail pipe string can be realized, running reliability of the tail pipe string is guaranteed, and safe and rapid running of the tail pipe string to a designed position is guaranteed. The intelligent hydraulic control system 13 adopts three signal excitation modes of mud pulse, wireless electromagnetic or acoustic wave, can be arbitrarily combined according to the well condition, has strong applicability to complex well conditions, and improves the use reliability of tools. The intelligent hydraulic control system 13 is integrated with the running tool 1, and after construction is finished, the intelligent hydraulic control system 13 can be lifted out of a wellhead along with a drilling tool, and can be reused after maintenance, so that the purposes of reducing cost and enhancing efficiency are achieved. In addition, the upper end of the tieback cylinder 2 is provided with an anti-advance sitting and hanging component 103, so that the phenomenon that the liner hanger unit 3 is sitting and hanging in advance due to collision of the tieback cylinder 2 in the process of the liner hanger unit 3 is prevented.

In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, in the description herein, reference to the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that the above description is only of a preferred embodiment of the invention and is not to be construed as limiting the invention in any way. Although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the techniques described in the foregoing examples, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (15)

1. An intelligent control liner hanger comprising:

A liner hanger unit (3) comprising a seat-hanging mechanism (31);

A running tool (1) for running the liner hanger unit (3) downhole, comprising a setting drive unit (11), a hydraulic release unit (12), and an intelligent hydraulic control system (13) arranged between the setting drive unit (11) and the axial direction of the hydraulic release unit (12);

The intelligent hydraulic control system (13) comprises a core assembly (131), a circuit unit (132) and a hydraulic assembly (133), wherein the core assembly (131) can receive signals emitted by a wellhead and transmit the signals to the circuit unit (132) so as to identify a sitting and hanging instruction or a releasing instruction and send the sitting and hanging instruction to the hydraulic assembly (133), and the hydraulic assembly (133) can output high-pressure oil to the sitting and hanging driving unit (11) according to the sitting and hanging instruction so as to drive the sitting and hanging mechanism (31) to realize sitting and hanging actions, or output high-pressure oil to the hydraulic releasing unit (12) according to a releasing instruction so as to realize releasing actions.

2. The intelligent control liner hanger according to claim 1, wherein the hydraulic assembly (133) includes a hydraulic pump and a hydraulic motor in signal connection with the circuit unit (132), respectively, the hydraulic pump and the hydraulic motor pumping high pressure oil according to instructions identified by the circuit unit (132).

3. The intelligent control liner hanger according to claim 2, wherein the cartridge assembly (131) includes a coil configured to receive a wireless electromagnetic signal emitted from a wellhead to a wireless magnet ball (4) at the intelligent hydraulic control system (13) and to pass to the circuit unit (132).

4. The intelligent control liner hanger according to claim 3, wherein the cartridge assembly (131) further comprises a vibration sensor configured to receive a pulse signal emitted from a wellhead and to communicate to the circuit unit (132).

5. The intelligent control liner hanger according to claim 4, wherein the cartridge assembly (131) further comprises an acoustic wave receiving device configured to receive an acoustic wave signal emitted from a wellhead and to pass to the circuit unit (132).

6. The intelligent control liner hanger according to any one of claims 1 to 5, wherein the intelligent hydraulic control system (13) further comprises a tubular mounting body (5), a battery assembly (6) for power supply, and an oil bag assembly (7) for storing hydraulic oil,

Wherein, be equipped with a plurality of circumference interval distribution's mounting groove on the outer wall of tubular installation main part (5), core subassembly (131), circuit unit (132), hydraulic pressure subassembly (133) with battery pack (6), and oil drum subassembly (7) are installed respectively in corresponding in the mounting groove.

7. The intelligent control liner hanger according to claim 1, wherein the liner hanger unit (3) further comprises a cylindrical body (32), the seat hanging mechanism (31) is sleeved on the cylindrical body (32), and a clamping groove (321) is formed in the inner wall of the upper end of the cylindrical body (32) and is used for being connected with the hydraulic release unit (12).

8. The intelligent control liner hanger according to claim 7, wherein the setting mechanism (31) comprises a slip assembly, the setting drive unit (11) being capable of generating setting thrust to drive the slip assembly radially expanded against the wellbore casing to complete setting.

9. The intelligent control liner hanger according to claim 8, wherein the running tool further comprises a first base pipe (14), the seat-on drive unit (11) being sleeved on the first base pipe (14).

10. The intelligent control liner hanger according to claim 9, wherein the seat-hanging drive unit (11) comprises:

A piston (111) sleeved on the first central tube (14);

A plug cap (112) fixedly connected with the piston (111);

a sitting and hanging hydraulic cylinder (113) sleeved on the first central tube (14); and

A tieback cylinder (2) for transmitting setting thrust, disposed between the setting plug cap (112) and the slip assembly;

Wherein a piston cavity is formed between the sitting and hanging hydraulic cylinder (113) and the first central tube (14), a radially protruding piston part is formed at the lower end of the piston (111), the piston part is arranged in the piston cavity, the piston (111) can descend under the action of high-pressure oil pumped by the hydraulic assembly (133) through the piston part to generate sitting and hanging thrust, and the sitting and hanging thrust is transmitted to the slip assembly through the plug cap (112) and the tieback cylinder (2).

11. The intelligent control liner hanger according to claim 10, wherein a first fluid transfer passage (1130) is provided in a wall of the seat-hanging cylinder (113), and a fluid chamber (1131) in the piston chamber corresponding to an upper end of the piston portion communicates with the hydraulic assembly (133) through the first fluid transfer passage (1130).

12. The intelligent control liner hanger according to any one of claims 9 to 11, wherein an anti-advance seat-hanging assembly (103) is provided at an upper end of the tieback tube for preventing the seat-hanging mechanism (31) from being seat-hung in advance.

13. The intelligent control liner hanger according to claim 7, wherein the hydraulic release unit (12) comprises:

A hollow mandrel (121);

A spring claw (122) sleeved on the hollow mandrel (121);

A releasing hydraulic cylinder (123) sleeved on the hollow mandrel (121), wherein the releasing hydraulic cylinder (123) is connected with the hollow mandrel (121) through a releasing shear pin (124) and is positioned between a claw part (1220) of the spring claw (122) and the hollow mandrel (121);

wherein the claw portion (1220) is adapted to the engagement groove (321) of the tubular body (32) in an initial state, thereby connecting the liner hanger unit (3) with the hydraulic release unit (12),

The releasing hydraulic cylinder (123) can shear the releasing shear pin (124) under the action of high-pressure oil pumped by the hydraulic assembly (133) and drive the spring claw (122) to move upwards so that the claw part (1220) is separated from the clamping groove (321), and releasing action is realized.

14. The intelligent control liner hanger according to claim 13, wherein a second fluid transfer passage (125) is provided in a wall of the hollow mandrel (121) for communicating the release cylinder (124) with the hydraulic assembly (133).

15. A method of using the intelligent control liner hanger of any one of claims 1 to 14, comprising the steps of:

The intelligent control tail pipe hanger is assembled, connected with an upper drilling tool and a lower tail pipe string respectively, and is lowered into a shaft to a preset position;

transmitting a sitting and hanging control signal from a wellhead, wherein the movement assembly (131) receives the sitting and hanging control signal and then transmits the sitting and hanging control signal to the circuit unit (132) so as to identify a sitting and hanging instruction and transmit the sitting and hanging instruction to the hydraulic assembly (133), and the hydraulic assembly (133) outputs high-pressure oil to the sitting and hanging driving unit (11) according to the sitting and hanging instruction so as to drive the sitting and hanging mechanism (31) to realize sitting and hanging actions;

After the sitting and hanging are finished, transmitting a releasing control signal from a wellhead, and transmitting the releasing control signal to the circuit unit (132) after the core assembly (131) receives the releasing control signal so as to identify a releasing instruction and transmit the releasing instruction to the hydraulic assembly (133), wherein the hydraulic assembly (133) outputs high-pressure oil to the hydraulic releasing unit (12) according to the releasing instruction so as to realize releasing action;

the running tool (1) is put forward and is transferred to a conventional liner for cementing operation.