CN115853473A - A Selective Inflow Controller - Google Patents

Abstract

The invention discloses a selective inflow controller, which includes a control device and a third fluid control mechanism, wherein the control device includes a first fluid control mechanism and a second fluid control mechanism, and the third fluid control mechanism can drive the second fluid control mechanism. The fluid control mechanism moves to control the flow rate of the fluid delivered to the outside by the first fluid control mechanism through the second fluid control mechanism. The device can effectively solve the problem of water control during oil and gas production, ensure the uniform production of liquid in each section, and achieve the effect of water control and stable oil production.

Description

A Selective Inflow Controller

technical field

The invention relates to the field of oil and gas exploitation, in particular to a selective inflow controller.

Background technique

Well fluids produced from subsurface rocks contain particles or sand. Generally, the solid particles in the well fluid are filtered by installing sand control screens in the well. Sand control screen is mainly composed of sand screen, base pipe and inflow controller. Wherein, the inflow controller can adjust the flow rate of the fluid entering the interior of the base pipe according to different types of fluid.

The inflow controller is the core tool in this process, which mainly plays the role of inhibiting the liquid production in the high-permeability section and balancing the pressure in the entire wellbore. In the prior art, according to the different effects produced by the use of the inflow controller, it is divided into a variety of different styles such as nozzle type, channel type and orifice type. However, the disadvantage of this inflow controller cannot be ignored. On the one hand, the device cannot be adjusted again after it has been put into use. On the other hand, this device can only limit the formation fluid production rate locally in the wellbore. Therefore, only relying on the current technology cannot meet the requirements of production.

Contents of the invention

The object of the present invention is to propose a selective inflow controller with double gates for controlling fluid. In the first checkpoint, fluid is injected into the chamber through the swirl flow control assembly to form a vortex, so that part of the fluid (such as oil in the oil well) flows to the outside through the second channel. The second hurdle, because the second fluid control mechanism has the ability to respond differently to the difference in fluid viscosity, by selectively closing the entrance of the second channel, the flow of fluid flowing to the outside can be effectively controlled, thereby solving It is difficult to control water during oil and gas production, so as to ensure the uniform production of liquid in each stage and achieve the effect of water control and stable oil production.

According to the present invention, a selective inflow controller is provided, comprising: a control device, the control device includes a first fluid control mechanism arranged on the top for receiving fluid, and a second fluid control mechanism arranged inside, One end of the second fluid control mechanism communicates with the first fluid control mechanism, the other end communicates with the outside, and a third fluid control mechanism, one end of the third fluid control mechanism communicates with the first fluid control mechanism , and the other end communicates with the second fluid control mechanism, wherein the third fluid control mechanism is configured to drive the movement of the second fluid control mechanism to control the fluid delivered by the first fluid control mechanism through the second fluid control mechanism Flow of fluid to the outside.

In one embodiment, the first fluid control mechanism includes a chamber for receiving fluid, the top of the chamber is equipped with a swirl control assembly, and the bottom of the chamber leads to the second fluid control mechanism .

In one embodiment, the swirl flow control assembly includes a plurality of first passages, the first passages communicate with the chamber, and each of the first passages is configured to guide fluid into the chamber along a tangential direction. chamber such that the fluid forms a vortex within the chamber.

In one embodiment, the second fluid control mechanism includes a piston and an oil bladder in order from top to bottom, and the second fluid control mechanism is configured to be able to adjust the longitudinal position of the piston by changing the deformation of the oil bladder, thereby Flow of fluid through the chamber into the second fluid control mechanism is controlled.

In one embodiment, the bottom of the oil bag communicates with the third fluid control mechanism, and the oil bag is configured to absorb fluid and deform itself to apply longitudinal pressure to the bottom of the piston, thereby The piston is driven to move longitudinally.

In one embodiment, a pressure cavity is formed inside the oil bladder, and the pressure cavity is configured to generate different pressures in response to different viscosities of fluid flowing into the oil bladder, so that the piston moves longitudinally.

In one embodiment, after the fluid with higher viscosity flows into the oil bag, the pressure in the pressure chamber is lower than the pressure applied by the fluid to the piston, and the piston moves downstream; After the fluid flows into the oil bag, the pressure in the pressure chamber is greater than the pressure applied by the fluid flowing to the piston, and the piston moves upstream.

In one embodiment, a throttling nozzle is connected downstream of the pressure chamber for delivering part of the fluid in the pressure chamber to the outside.

In one embodiment, it is characterized in that the second fluid control mechanism includes a plurality of second channels uniformly arranged in the control device along the circumferential direction, and one end of the second channel is connected to the second fluid The control mechanism is connected, and the other end leads to the outside.

In one embodiment, it is characterized in that the third fluid control mechanism is formed as a helical tube for being wound on the outside of the control device.

Description of drawings

The present invention will be described in detail below in conjunction with accompanying drawing, in the figure:

Figure 1 schematically shows a longitudinal sectional view of a selective inflow controller according to the present invention;

Figure 2 schematically shows a transverse cross-sectional view of the selective inflow controller according to the present invention, specifically showing the communication relationship between the first channel and the chamber;

Figure 3 schematically shows a bottom view of a selective inflow controller according to the present invention.

In the figures, the same parts are given the same reference numerals. The figures are not drawn to scale.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing. Directional terms "longitudinal" or "axial" direction, that is, the vertical direction in Figure 1, the term "transverse" or "radial" refers to the direction perpendicular to the "longitudinal" or "axial", that is, 1 in the horizontal direction. In addition, the terms "upstream" and "downstream" are both understood with respect to the direction of fluid flow.

Fig. 1 schematically shows a longitudinal sectional view of a selective inflow controller according to the present invention. As shown in FIG. 1 , the selective inflow controller 100 according to the present invention mainly includes a control device 10 . The control device 10 includes a housing 11 , a first fluid control mechanism 20 , a second fluid control mechanism 40 and a third fluid control mechanism 60 . Wherein, the first fluid control mechanism 20 is arranged in the housing 11 and is used to guide the upstream fluid (ie from the formation) to flow to the housing 11 . The second fluid control mechanism 40 is arranged inside the casing 11, and one end communicates with the first fluid control mechanism 20, and the other end communicates with the outside (such as a wellbore). In addition, the second fluid control mechanism 40 can guide the fluid in the first fluid control mechanism 20 to flow to the outside. The third fluid control mechanism 60 is arranged on the outer periphery of the housing 11, and one end communicates with the first fluid control mechanism 20, and the other end communicates with the second fluid control mechanism 40, so as to guide part of the fluid in the first fluid control mechanism 20 to the second fluid control mechanism 40 .

As shown in FIG. 1 , the first fluid control mechanism 20 includes a chamber 30 and a swirl control assembly 31 . Wherein, the swirl flow control component 31 communicates with the chamber 30 . The chamber 30 is disposed inside the housing 11 for receiving fluid from the swirl control assembly 31 . In addition, the bottom of the chamber 30 communicates with the second fluid control mechanism 40 for guiding the fluid in the chamber 30 to flow to the second fluid control mechanism 40 . The swirl flow control component 31 is installed on the chamber 30 and communicates with it, and is used to guide the upstream fluid to flow to the chamber 30 .

The swirl control assembly 31 includes several first channels 311 . FIG. 2 schematically shows a transverse cross-sectional view of the selective inflow controller according to the present invention, specifically showing the communication relationship between the first channel 311 and the chamber 30 . As shown in FIG. 2 , the first passage 311 is in communication with the chamber 30 , and the first passage 311 is configured to guide fluid into the chamber 30 along a tangential direction, so that the fluid forms a vortex in the chamber 30 .

According to the selective inflow controller 100 of the present invention, it can be seen that the fluid with higher viscosity (for example, oil in an oil well) suffers a large additional resistance when rotating in the chamber 30, so the flow velocity of this part of the fluid is small and the circulation is good. , can directly flow to the outside through the second fluid control mechanism 40 . Fluids with less viscosity (such as water and gas in oil wells) bear little additional resistance when rotating in the chamber 30, so the flow velocity of this part of the fluid is high and the circulation is not good, forming a vortex in the chamber 30, So as to achieve the effect of water control and oil stabilization.

As shown in FIG. 1 , the second fluid control mechanism 40 includes a piston 41 , an oil bag 42 and a second channel 50 . The second channel 50 is disposed inside the casing 11 along the circumferential direction, and communicates with the chamber 30 at one end and communicates with the outside at the other end, for guiding the fluid in the chamber 30 to flow to the outside. The piston 41 is arranged downstream of the chamber 30 (ie, in the direction of the wellbore) and communicates with the second passage 50 for receiving fluid from the chamber 30 and guiding the fluid to the second passage 50 . The oil bag 42 is disposed downstream of the piston 41 and communicates with the third fluid control mechanism 60 for receiving fluid from the third fluid control mechanism 60 .

In a specific embodiment of the present invention, the oil bag 42 includes a bag made of elastic and soft material. The oil bladder 42 can deform the bladder according to the flow rate of fluid flowing into the bladder. That is to say, the second fluid control mechanism 40 is configured to adjust the longitudinal position of the piston 41 by changing the deformation of the oil bladder 42 , so as to control the flow of fluid flowing into the second channel 50 through the chamber 30 . In addition, as the fluid flowing into the oil bag 42 from the third fluid control mechanism 60 increases, the volume of the bag gradually increases, and the oil bag 42 exerts upward pressure on the piston 41 to drive the piston 41 to move upstream. In this way, the path leading from the chamber 30 to the second channel 50 is gradually closed.

According to the present invention, a pressure cavity (not shown) is formed inside the oil bladder 42 , and the pressure cavity can generate different pressures according to the viscosity of the fluid flowing into the oil bladder 42 . Specifically, when the viscosity of the fluid is low, the pressure in the pressure chamber increases, and the volume of the bladder gradually increases; when the viscosity of the fluid is high, the pressure in the pressure chamber decreases, and the volume of the bladder gradually decreases. By changing the volume of the bag, the piston 41 is effectively pushed, so that the piston 41 can reciprocate in the longitudinal direction.

That is, in a specific embodiment of the present invention, when oil occupies a major part of the fluid, the viscosity of the fluid is higher. In this way, after the fluid with higher viscosity flows into the oil bag 42 , the pressure in the pressure chamber is lower than the pressure applied by the fluid flowing to the piston 41 . At this time, the piston 41 moves downward. A fluid is less viscous when water, or air, or the combination of water and air makes up the majority of the fluid. In this way, after the fluid with lower viscosity flows into the oil bag 42 , the pressure in the pressure chamber is greater than the pressure exerted by the fluid flowing to the piston 41 . At this time, the oil bag 42 pushes the piston 41 to move upward.

As shown in FIG. 1 , a throttle nozzle 43 is connected downstream of the oil bag 42 for discharging fluid to the outside. In this way, when the piston 41 closes the second channel 50 , part of the fluid in the oil bag 42 can be discharged from the throttling nozzle 43 to the outside.

As shown in FIG. 1 , the third fluid control mechanism 60 includes a first pipe port 61 and a second pipe port 62 . Wherein, the first pipe port 61 is directly connected with the chamber 30 for receiving part of the fluid from the chamber 30 so as to guide the part of the fluid to the second pipe port 62 . The second conduit port 62 directly communicates with the oil bladder 42 for guiding the fluid in the third fluid control mechanism 60 into the oil bladder 42 .

In one embodiment of the present invention, the third fluid control mechanism 60 is formed as a helical pipe for winding on the outside of the control device 10 . In this way, the overall installation of the selective inflow controller 100 is facilitated.

Figure 3 schematically shows a bottom view of a selective inflow controller according to the present invention. As shown in FIG. 3 , the bottom end of the casing 11 is provided with a plurality of channel outlets 111 along the circumferential direction. The channel outlet 111 communicates with the second channel 50 for guiding the fluid in the second channel 50 to flow to the outside. In addition, a throttling nozzle discharge port 431 is provided at the center of the bottom end of the casing 11 for guiding the fluid in the throttling nozzle 43 to flow to the outside.

In one embodiment of the present invention, as shown in FIG. 1 , support members 44 are provided at both ends of the piston 41 . The supporting member 44 can support the piston 41 to reciprocate longitudinally in the casing 11 .

The working principle of the selective inflow controller 100 of the present invention:

The device has two fluid flow logging, which are as follows:

1. The upstream fluid flows directly to the outside through the first channel 311 , the chamber 30 and the second channel 50 respectively. At this time, the second channel 50 is in an open state, and the piston 41 is in an initial position, allowing fluid to flow into the second channel 50 through the chamber 30 .

2. The upstream fluid flows into the chamber 30 from the first channel 311 , and then flows into the oil bag 42 through the third fluid control mechanism 60 , and part of the fluid in the oil bag 42 can flow out through the throttling nozzle 43 . At this time, the second channel 50 is in a closed state.

The specific working process of the first fluid control mechanism 20 is as follows:

The fluid is injected tangentially into the chamber 30 through the first channel 311 , and the fluid forms a vortex in the chamber 30 . The fluid at this time is divided into two parts: one part of the fluid with higher viscosity (such as oil) bears a large additional resistance in the chamber 30, the flow velocity is small, and the flowability is good, and it flows directly to the outside through the second channel 50; The small fluids (such as water and gas) in the chamber 30 bear little additional resistance, have a high flow velocity, and have poor circulation, forming eddy currents in the chamber 30 .

The specific working process of the second fluid control mechanism 40 is as follows:

After the upstream fluid flows into the chamber 30 from the first channel 311 , more fluid flows to the second fluid control mechanism 40 through the chamber 30 , and less fluid flows to the third fluid control mechanism 60 through the chamber 30 .

The first process: when the viscosity of the fluid flowing into the second fluid control mechanism 40 is high, the pressure exerted by the fluid on the piston 41 is greater than the pressure in the pressure chamber, and the fluid in the second fluid control mechanism 40 passes directly through the second fluid control mechanism 40. The second channel 50 flows to the outside. At this time, the second channel 50 is in an open state.

Second process: when the viscosity of the fluid flowing into the second fluid control mechanism 40 is low, the pressure applied by the fluid flowing to the piston 41 is lower than the pressure in the pressure chamber. The pressure in the pressure chamber gradually increases, and the volume of the oil bag 42 gradually increases, thereby pushing the piston 41 to move upward until closing the second channel 50 . At this time, part of the fluid in the oil bag 42 flows from the throttle nozzle 43 to the outside.

After that, as the viscosity of the fluid flowing into the second fluid control mechanism 40 increases, the pressure in the pressure chamber gradually decreases, and the volume of the oil bag 42 gradually shrinks. Under the action of fluid gravity, the piston 41 moves downward, so that the second Channel 50 is reopened. So far, the second process is transferred to the first process.

The invention has dual control functions for fluids with different viscosities. The first control action consists in injecting fluid tangentially into the chamber 30 through the swirl control assembly 31 . In the chamber 30 , the fluid with higher viscosity directly flows to the outside through the second passage 50 , and the fluid with lower viscosity forms a vortex in the chamber 30 , so as to achieve the effect of controlling water and stabilizing oil. The second control function is that the second fluid control mechanism 40 has the ability to respond differently to the difference in fluid viscosity. In this way, the piston 41 can be controlled to reciprocate in the longitudinal direction by changing the deformation of the oil bag 42, thereby selectively closing the entrance of the second passage 50, thereby effectively controlling the flow of the fluid flowing to the outside, and then solving the problem of oil and gas. It is difficult to control water during mining, so as to ensure that the liquid produced in each section is uniform and realize the effect of water control and stable oil production.

The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art can easily make changes or changes within the disclosed scope of the present invention, and such changes or changes should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (10)

1. A selective inflow controller (100), comprising:

a control device (10), said control device (10) comprising a first fluid control means (20) arranged at the top for receiving a fluid, and a second fluid control means (40) arranged inside, one end of said second fluid control means (40) being in communication with said first fluid control means (20) and the other end being in communication with the outside, and

a third fluid control mechanism (60), one end of the third fluid control mechanism (60) being in communication with the first fluid control mechanism (20) and the other end being in communication with the second fluid control mechanism (40),

wherein the third fluid control mechanism (60) is configured to drive the second fluid control mechanism (40) to move so as to control the flow rate of the fluid which is conveyed to the outside by the first fluid control mechanism (20) through the second fluid control mechanism (40).

2. The selective inflow control device of claim 1, wherein the first fluid control mechanism (20) comprises a chamber (30) for receiving fluid, a swirl control assembly (31) mounted to a top of the chamber (30), and a bottom of the chamber (30) open to the second fluid control mechanism (40).

3. The selective inflow controller of claim 2, wherein the swirl control assembly (31) comprises a number of first channels (311), the first channels (311) being in communication with the chamber (30),

each of the first channels (311) is configured to direct a tangential flow of fluid into the chamber (30) such that the fluid forms a vortex within the chamber (30).

4. The selective inflow control device of claim 3, wherein the second fluid control mechanism (40) comprises, in order from top to bottom, a piston (41) and an oil bladder (42),

the second fluid control mechanism (40) is configured to be able to control the flow rate of fluid through the chamber (30) into the second fluid control mechanism (40) by changing the amount of deformation of the oil bladder (42) to adjust the position of the piston (41) in the longitudinal direction.

5. The selective inflow control of claim 4, wherein a bottom of the oil bladder (42) is in communication with the third fluid control mechanism (60),

the oil bag (42) is configured to absorb fluid to deform itself to apply a pressure in a longitudinal direction to a bottom of the piston (41) to drive the piston (41) to move in the longitudinal direction.

6. The selective inflow controller of claim 5, wherein an interior of the oil bladder (42) forms a pressure chamber configured to generate different pressures in response to a difference in viscosity of a fluid flowing into the oil bladder (42) such that the piston (41) moves in a longitudinal direction.

7. The selective inflow controller of claim 6,

after the fluid with higher viscosity flows into the oil bag (42), the pressure of the pressure cavity is smaller than the pressure exerted by the fluid flowing onto the piston (41), and the piston (41) moves downstream;

after the fluid having a lower viscosity flows into the oil pocket (42), the pressure of the pressure chamber is greater than the pressure exerted by the fluid flowing onto the piston (41), and the piston (41) moves upstream.

8. The selective inflow control according to claim 7, wherein a throttling nozzle (43) is connected downstream of the pressure chamber for conveying a portion of the fluid in the pressure chamber to the outside.

9. The selective inflow control device according to any one of claims 1 to 8, wherein the second fluid control mechanism (40) comprises a plurality of second passages (50) uniformly circumferentially disposed within the control device (10), each of the second passages (50) having one end communicating with the second fluid control mechanism (40) and the other end open to the outside.

10. The selective inflow control of any of claims 1 to 8, wherein the third fluid control mechanism (60) is formed as a helical tube for wrapping around the exterior of the control device (10).

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