CN116241237A - A real-time measurement device for formation resistivity around the well during packer well testing - Google Patents

Abstract

The invention relates to a real-time measuring device for formation resistivity around a well during a packer well test, comprising a packer well test module and a resistivity measurement module, two ends of the resistivity measurement module are symmetrically arranged with two said packers. The packer well testing module; the packer well testing module includes a packer base, on which a setting module and an extraction module are arranged. A closed annulus is formed between the sealing modules, and the extraction module is used to extract the drilling fluid in the annulus; the resistivity measurement module includes a measurement probe base, and the measurement probe base is provided with a measurement module. The measurement module is used to measure the change value of formation resistivity with time at different depths from the borehole wall; the two packer base bodies are respectively connected to the two ends of the measurement probe base body. The invention can monitor in real time the variation of formation fluid distribution with time during the well test suction process.

Description

A real-time measurement device for formation resistivity around the well during packer well testing

technical field

The invention belongs to the field of formation resistivity testing around wells, and in particular relates to a real-time measuring device for formation resistivity around wells during the well testing process of a packer.

Background technique

In the process of packer well testing, it is necessary to know the change of formation fluid flow in different directions around the well.

There is an annulus between the periphery of the drill collar and the well wall. Before the well testing operation, the initial fluid in the annulus is drilling fluid, and the fluid near the well wall in the formation is the mixed liquid of drilling fluid and formation fluid, that is, the liquid in the flushing zone, away from the well wall The liquid in the formation is the formation fluid, and the formation fluid and the fluid in the annular space are in a state of pressure balance.

The existing packer well testing technology cannot obtain real-time image information of fluid changes in the wellbore formation.

The existing electrical imaging technology can only measure the image of the borehole wall formation along the depth, and cannot reflect the change of the fluid in the formation with time.

Contents of the invention

In order to solve all or part of the above-mentioned problems, the object of the present invention is to provide a real-time measuring device for the resistivity of the formation around the well in the process of the packer well test, by measuring the resistivity information of the formation around the well in different directions during the packer test It reflects the change of formation fluid distribution in different azimuths around the well with time.

According to the present invention, a real-time measuring device for formation resistivity around the well during the packer well testing process is provided, including a packer well testing module and a resistivity measurement module, and two ends of the resistivity measurement module are symmetrically arranged. The packer well testing module;

The packer well testing module includes a packer base, on which a setting module and an extraction module are arranged, and after expansion, the setting module is close to the inner wall of the oil well so that the gap between the two setting modules A closed annulus is formed between them, and the extraction module is used to extract the drilling fluid in the annulus;

The resistivity measurement module includes a measuring probe base, and the measuring probe base is provided with a measuring module, and the measuring module is used to measure the change value of the formation resistivity with time at different depths from the borehole wall;

The two packer base bodies are respectively connected to the two ends of the measurement probe base body.

Optionally, the sealing module includes a packer rubber sleeve, the packer rubber sleeve is sleeved on the corresponding packer base, and the packer rubber sleeve and the corresponding packer base A packer fluid cavity is formed between them, and a sealing pump is connected to the packer fluid cavity.

Optionally, a setting fluid channel is opened on the base of the packer, and each of the packer fluid chambers is respectively connected to the setting pump through a corresponding setting fluid channel, and the setting pump is fixed on on the base of the packer.

Optionally, fixing rings are sleeved on the packer base on both sides of the packer rubber cylinder.

Optionally, two ends of the base body of the packer are provided with quick-twist nuts, and one of the quick-twist nuts is threadedly connected to the base body of the measuring probe, and several sealing rings are also provided at the joints.

Optionally, the pumping module includes a well testing pump, an accommodation chamber and a well testing fluid channel, the accommodation chamber is opened in the axial middle of the packer base body and the measurement probe base body, and the well testing pump is set At both ends of the accommodation chamber, the well testing fluid channel is opened on the packer base and communicates with the accommodation chamber and the annulus.

Optionally, the measurement module includes a plurality of excitation coils, the excitation coils are sleeved on the base body of the measurement probe, and several azimuthal resistivity measurement probes are distributed in the circumferential direction of the middle part of the base body of the measurement probe, and the An insulating structure is arranged between the excitation coil and the base body of the measuring probe, and the insulating structure is arranged near the side of the azimuth resistivity measuring probe.

Optionally, grooves are formed on the base body of the measuring probe, and an insulating ring is sheathed on each of the grooves, and the excitation coil is fixed on the corresponding insulating ring.

Optionally, a coil protection sleeve is sheathed at the opening of each groove.

Optionally, an electronic compartment is provided on the base of the measuring probe, and a measurement circuit module is arranged in the electronic compartment, and a cover is provided on the base of the measuring probe, and the cover is sealed on the electronic compartment.

Optionally, the excitation coil, the coil protection sleeve, the insulating ring, the electronic compartment, the measurement circuit module, and the compartment cover are arranged outside the two packer well testing modules.

It can be seen from the above technical scheme that a real-time measuring device for the resistivity of the formation around the well during the packer well testing process provided by the present invention has the following beneficial effects:

During the packer well testing process, the resistivity information of different azimuths around the wellbore is measured, and an image is generated to reflect the change of the formation fluid distribution in different azimuths around the wellbore over time.

While obtaining the formation resistivity and permeability information around the wellbore, the change characteristics of the formation resistivity in various azimuths around the wellbore during the formation fluid flow process are obtained, so as to analyze the formation pore connectivity and formation fluid distribution in different azimuths around the wellbore.

The present invention obtains comprehensive formation information from two dimensions of time and space, has high integration and strong comprehensiveness, provides very valuable formation information for reservoir evaluation, and will be widely used in logging operations.

Description of drawings

Fig. 1 is a cross-sectional view of a real-time measuring device for formation resistivity around a well during a packer well testing process according to an embodiment of the present invention;

Fig. 2 is a sectional view along C-C in Fig. 1;

Figure 3 is an enlarged view of the upper half of Figure 1;

Fig. 4 is an enlarged view of the lower half of Fig. 1 .

The numbers in the figure are: formation 1, quick-twist nut 2, fixed ring 3, packer rubber barrel 4, packer base 5, measuring probe base 6, coil protection sleeve 7, excitation coil 8, insulating ring 9, tank cover 10. Electronic warehouse 11, azimuthal resistivity measuring probe 12, annular space 13, well testing pump 14, packer fluid cavity 15, seating fluid channel 16, seating pump 17, well testing fluid channel 18, and accommodation cavity 19.

Detailed ways

In order to better understand the purpose, structure and function of the present invention, a real-time measurement device for formation resistivity around the well during the packer well testing process of the present invention will be described in further detail below in conjunction with the accompanying drawings.

As shown in Fig. 1 and Fig. 2, it is shown as a real-time measuring device for formation resistivity around the well during a packer well test process of an embodiment of the present invention. There is an oil well drilled in the formation 1, and during the packer well test process , the real-time measurement device for formation resistivity around the well is set in the oil well.

The real-time measurement device for formation resistivity around the well during the packer well testing process in this embodiment includes a packer well test module and a resistivity measurement module; the packer well test modules are two with the same structure, and they are symmetrically arranged At both ends of the resistivity measurement module; taking one of the packer well testing modules as an example, it specifically includes a packer base 5, a setting module and an extraction module, and the setting module and the extraction module are arranged on the packer base 5 , so there are two seating modules in total, and after the expansion of the two seating modules, they are close to the inner wall of the oil well so that a closed annular space 13 is formed between the two seating modules and the inner wall of the oil well, and the extraction module can extract the drilling fluid in the annular space 13 liquid; the resistivity measurement module includes a measurement probe base 6 and a measurement module, the measurement module is arranged on the measurement probe base 6, and the measurement module is used to measure the change value of the formation resistivity with time at different depths from the well wall; in addition, the packer base 5 They are respectively connected to the two ends of the base body 6 of the measuring probe.

The real-time measurement device for formation resistivity around the well during the packer well testing process in this embodiment is mainly composed of a packer well test module and an azimuth resistivity real-time measurement module, which can be realized during the packer well test operation. Real-time measurement of the change in resistivity of the formation around the wellbore at different azimuths and at different depths from the wellbore wall over time, so as to monitor the change of formation fluid distribution over time during the well test pumping process in real time.

On the basis of the above embodiments, the setting module in this embodiment specifically includes a packer rubber sleeve 4, and the packer rubber sleeve 4 is sleeved on the corresponding packer base 5. In addition, the packer rubber sleeve 4 and A packer fluid cavity 15 is formed between the corresponding packer bases 5, and the packer fluid cavity 15 is connected to the sealing pump 17, so when the high-pressure fluid is injected into the packer fluid cavity 15 through the setting pump 17 , it can make the packer rubber sleeve 4 expand and become thicker. With the continuous injection of high-pressure fluid, the packer rubber sleeve 4 expands to be close to the inner wall of the oil well. When the packer rubber sleeve 4 at both ends of the resistivity measurement module is uniform After being closely attached to the formation, it is equivalent to forming a sealed annular space 13 between the two packer rubber sleeves 4 and the oil well, and the resistivity measurement module is located in the annular space 13 . Specifically, a sealing fluid channel 16 is opened on the packer base 5, and each packer fluid chamber 15 is respectively connected to the setting pump 17 through the corresponding setting fluid channel 16, that is, the setting pump 17 first The high-pressure fluid is injected into the setting fluid channel 16 , and with the continuous injection of the high-pressure fluid, the fluid in the setting fluid channel 16 flows into the packer fluid chamber 15 , thereby achieving sealing through the expansion of the packer rubber tube 4 .

On the basis of the above embodiments, in order to realize the fixing of the sealing pump 17, the sealing pump 17 is fixed on the packer base 5 in this embodiment. Specifically, a fixing groove can be opened on the packer base body 5, and the seat seal pump 17 can be installed and fixed in the fixing groove.

On the basis of the above embodiments, in this embodiment, the packer base 5 on both sides of the packer rubber cylinder 4 is sleeved with a fixing ring 3, and the packer rubber cylinder 4 can be fixed by setting the fixing ring 3 On the packer base 5 , the arrangement of the fixing ring 3 can seal the two ends of the packer rubber cylinder 4 , thereby improving the sealing performance of the packer fluid chamber 15 .

As shown in Figure 1 and Figure 2, the two ends of the packer matrix 5 are provided with quick-twist nuts 2, which are screwed to the measurement probe base 6 through a quick-twist nut 2, and several sealing rings are arranged at the connection to ensure the connection sealed state. Another quick-twist nut 2 of the packer base body 5 can realize connection with other components, such as drill collars.

On the basis of the above embodiments, the pumping module in this embodiment includes a well testing pump 14, an accommodation chamber 19 and a well testing fluid channel 18, and the accommodation chamber 19 is provided in the axial middle of the packer base body 5 and the measuring probe base body. The well pump 14 is arranged at both ends of the housing chamber 19, and the well testing fluid channel 18 is set on the packer base 5 and communicates with the housing chamber 19 and the annulus 13, and the well testing fluid channel 18 is used for fluid flow in the annulus 13 , the well test pump 14 is used to pump the fluid in the annulus 13 to the containing chamber 19, after the fluid in the annulus 13 is pumped, the pressure in the annulus 13 decreases, and the formation fluid in the formation 1 flows into the annulus under the action of the pressure difference 13 in flow.

On the basis of the above embodiments, the measurement module in this embodiment includes a plurality of excitation coils 8, the excitation coils 8 are sleeved on the measurement probe base 6, and there are several azimuth resistivity measurement probes distributed in the middle circumferential direction of the measurement probe base 6 12. An insulating structure is provided between the exciting coil 8 and the measuring probe base 6, and the insulating structure is set close to the side of the azimuth resistivity measuring probe 12. The alternating voltage can be generated under the action of the transmitting circuit through the exciting coil 8. In the alternating voltage The azimuth resistivity measuring probe 12 can transmit current to the formation 1 under the action of the formation 1, and the current returns to the packer base 5 through the formation 1, so that the formation resistivity can be measured; in addition, the azimuth resistivity measurement probe 12 is distributed along the circumference, so that it can measure Resistivity at different locations.

The excitation coil 8 is equivalent to a power supply device, which is wireless power transmission, and is used to supply power to multiple resistivity measurement probes 12 at the same time. The wireless power transmission device and the measuring probe are equivalent to the primary loop and the secondary loop, and the energy transmission between the primary loop and the secondary loop is performed through coupling without direct electrical contact. The excitation coil 8 adopts a spiral wound ring structure, and AC power is supplied to the primary circuit of the excitation coil 8, and an AC voltage with the same frequency as the excitation coil 8 is generated between the coil upper base and the coil lower base. Under the action of AC voltage, power is supplied to multiple measuring probes at the same time.

On the basis of the above embodiment, in this embodiment, a plurality of grooves are opened on the base body 6 of the measuring probe, and an insulating ring 9 is sleeved on each groove, and the excitation coil 8 is fixed on the corresponding insulating ring 9. The insulation ring can play the role of insulation.

The insulating ring 9 can also be extended to the outside of the groove, close to the side of the azimuth resistivity measuring probe 12 . The insulating ring 9 is used to avoid a short circuit between the coil upper substrate and the coil lower substrate, which will affect the measurement effect of the azimuthal resistivity measurement probe 12 . The insulating ring 9 can be made of a composite material made of nylon and glass fiber to meet the requirements of high temperature resistance and reliable insulation performance. The insulating ring 9 can also be other insulating materials, such as polytetrafluoroethylene, urea-formaldehyde resin, alkyd resin and acetal resin.

On the basis of the above embodiments, in order to protect the excitation coil 8, the outer side of the excitation coil 8 is covered with a coil protection sleeve 7, which is specifically arranged at the opening of the groove.

On the basis of the above embodiments, an electronic compartment 11 is provided on the measuring probe base 6, and a measuring circuit module is arranged in the electronic compartment. superior.

The measuring probe base 6 can be provided with radial wire-passing holes corresponding to the power supply device, the measuring circuit module, and a plurality of probes, and the measuring probe base 6 is provided with axial wire-passing holes, and the signal transmission lines pass through the radial wire-passing holes and the shaft respectively. To the wire hole, the circuit connection arrangement of the signal transmission line inside the measurement probe base 6 is realized, and the electrical connection of the power supply device, multiple probes and the measurement circuit module is realized.

The above-mentioned excitation coil 8, coil protection sleeve 7, insulating ring 9, electronic chamber 11, measurement circuit module, chamber cover 10 and other components are arranged between two packer well testing modules, and can also be arranged between two packer well test modules. The outer side of the spacer well test module does not affect its normal function. At this time, the outer sides of the two packer well testing modules also need to be provided with a matrix, which is the structural basis for the above-mentioned components.

In order to facilitate the understanding of a real-time measuring device for formation resistivity around a well during a packer well testing process according to an embodiment of the present invention, its working process will be described in detail below.

When the measuring device reaches the target well section, firstly, two setting pumps 17 inject high-pressure fluid into the packer fluid chamber 15 through the setting fluid channel 16. With the continuous injection of high-pressure fluid, the packer rubber sleeve 4 expands to the same The inner wall of the oil well is tightly attached to realize the seat seal, and a sealed annular space 13 is formed between the two packer rubber sleeves 4 and the oil well;

After the setting is completed, the extraction module and the measurement module start to work at the same time; specifically, the well testing pump 14 sucks the fluid in the annular space 13 through the well testing fluid channel 18, so that the pressure in the annular space drops, and the formation fluid in the formation 1 is under the action of the pressure difference. It flows downward into the annular space 13; at the same time, the transmitting circuit provides an alternating voltage to the exciting coil 8, and an alternating voltage is generated in the exciting coil. The formation 1 returns to the packer base body 5, so as to realize the measurement of the resistivity of formations at different depths and azimuths around the well.

During the well testing operation, the fluid in the formation 1 continuously flows to the annulus 13 under the action of the pressure difference. Since the resistivity of the formation fluid and the fluid in the flushing zone are different, the azimuthal resistivity measurement probe 12 measures the formation resistivity at each depth. Constantly changing, thus reflecting the change of formation fluid distribution over time.

The different azimuth resistivity measuring probes 12 can reflect in real time the flow of formation fluids in different azimuths around the well during the pumping process, thereby reflecting the permeability of formations in different azimuths.

In addition, it should be noted that before the start of the well testing operation, the initial fluid in the annular space is drilling fluid, the fluid in the formation near the wellbore wall is the mixed liquid of drilling fluid and formation fluid, that is, the liquid in the flushing zone, and the fluid in the formation far away from the wellbore wall is the formation fluid , the formation fluid and the fluid in the annular space are in a state of pressure equilibrium.

It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application shall have the usual meanings understood by those skilled in the art to which the present invention belongs.

In this application, terms such as "installation", "connection", "connection" and "fixation" should be interpreted in a broad sense, for example, it can be a fixed connection or a detachable connection, unless otherwise clearly specified and limited. , or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. All of them should be covered by the scope of the claims and description of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (10)

1. A real-time measuring device for formation resistivity around a well in a packer well testing process, characterized in that it comprises a packer well testing module and a resistivity measurement module, and two ends of the resistivity measurement module are symmetrically arranged with two The packer well testing module; The packer well testing module includes a packer base, on which a setting module and an extraction module are arranged, and after expansion, the setting module is close to the inner wall of the oil well so that the gap between the two setting modules A closed annulus is formed between them, and the extraction module is used to extract the drilling fluid in the annulus; The resistivity measurement module includes a measuring probe base, and the measuring probe base is provided with a measuring module, and the measuring module is used to measure the change value of the formation resistivity with time at different depths from the borehole wall; The two packer base bodies are respectively connected to the two ends of the measurement probe base body. 2. A device for real-time measurement of formation resistivity around a well in a packer well testing process according to claim 1, wherein the setting module includes a packer rubber sleeve, and the packer rubber sleeve sleeve It is arranged on the corresponding packer base body, a packer fluid chamber is formed between the packer rubber cylinder and the corresponding packer base body, and the packer fluid chamber is connected with a sealing pump. 3. The real-time measuring device for formation resistivity around the well during a packer well testing process according to claim 2, characterized in that, the base of the packer is provided with a setting fluid channel, and each of the packers The fluid chambers of the packer are respectively connected with the seal pumps through corresponding seal fluid passages, and the seal pumps are fixed on the base body of the packer. 4. The real-time measuring device for formation resistivity around the well during a packer well testing process according to claim 3, characterized in that, the packer matrix on both sides of the packer rubber cylinder is sleeved With fixing ring. 5. The real-time measuring device for formation resistivity around the well in a packer well testing process according to claim 1, characterized in that, the two ends of the packer base body are provided with quick-twist nuts, through which one quick-twist nut is The screw nut is threadedly connected with the base body of the measuring probe, and several sealing rings are arranged at the connection. 6. The device for real-time measurement of formation resistivity around a well in a packer well testing process according to claim 1, wherein the pumping module includes a well testing pump, an accommodation chamber and a well testing fluid channel, and the accommodating The cavity is set in the axial middle of the packer base and the measuring probe base, the well testing pump is set at both ends of the accommodation cavity, and the well testing fluid channel is set on the packer base And it communicates with the accommodating cavity and the annular space. 7. A real-time measurement device for formation resistivity around the well during packer well testing according to claim 1, characterized in that the measurement module includes a plurality of excitation coils, and the excitation coils are sleeved on the measurement On the probe base, several azimuth resistivity measuring probes are distributed in the middle circumferential direction of the measuring probe base, and an insulating structure is arranged between the excitation coil and the measuring probe base, and the insulating structure is close to the azimuth resistivity measuring probe. Probe side setting. 8. A real-time measuring device for formation resistivity around a well during a packer well testing process according to claim 7, characterized in that grooves are provided on the base of the measuring probe, and each of the grooves is covered with An insulating ring is provided, and the excitation coil is fixed on the corresponding insulating ring. 9. A real-time measuring device for formation resistivity around a well during a packer well testing process according to claim 8, wherein the opening of each groove is covered with a coil protection sleeve. 10. A device for real-time measurement of formation resistivity around the well during packer well testing according to claim 9, characterized in that an electronic cabin is provided on the base of the measurement probe, and a measurement circuit is arranged in the electronic cabin module, the base body of the measuring probe is provided with a cover, and the cover is sealed on the electronic compartment; Alternatively, the excitation coil, the coil protection sleeve, the insulating ring, the electronic compartment, the measurement circuit module, and the compartment cover are arranged outside the two packer well testing modules.

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