Flow device, oil and gas well injection system and use method

Abstract

The present application provides a circulation device, an oil and gas well injection system and a method of use, a circulation device, an oil and gas well injection system and a method of use, the circulation device includes a mounting pipe, a mounting seat, a one-way circulation component and a ring set; the one-way circulation component is arranged in the conducting pipe, and controls the one-way flow of the liquid in the annular area to the lumen of the mounting pipe. The oil pipe can be connected through the mounting pipe, so that the liquid enters the lumen of the oil pipe through the lumen of the mounting pipe; by setting the ring set, the ring set can be surrounded by the mounting seat and the outer wall of the mounting pipe to form an annular area, and the annular area can accommodate liquid for cleaning; by setting the guiding circulation component, the liquid flowing into the lumen of the oil pipe is controlled, and by controlling the flow rate of the liquid, an appropriate amount of liquid is introduced into the oil pipe, reducing the possibility of contact between the liquid and the reservoir, reducing the possibility of affecting the reservoir quality, and avoiding affecting the oil and gas production.

Description

Technical Field

[0001] The present application relates to the technical field of pipeline cleaning, and in particular to a circulation device, an oil and gas well injection system and a use method. Background Art

[0002] Oil and gas pipelines are composed of oil pipes and their accessories. According to the needs of the process flow, they can be equipped with corresponding power pump groups to form a complete pipeline system for the connection, unloading and transfer of oil and gas. In this process, the fluid in the reservoir flows from bottom to top under the action of pressure, and the temperature and pressure of the fluid will change, which is easy to cause salt precipitation and scaling, cooling and waxing, etc.

[0003] In the prior art, in order to solve the scaling and waxing problems, a combination of prevention and treatment is usually adopted to take process measures, by injecting a large amount of working fluid into the oil pipe for circulation and cleaning, and using the working fluid to dissolve the salt scale and wax blocks accumulated in the oil pipe to complete the dredging.

[0004] However, in the above-mentioned cleaning method, the working fluid is likely to come into direct contact with the reservoir, which will affect the quality of the reservoir and further reduce the oil and gas production. Summary of the invention

[0005] In order to solve at least one of the problems mentioned in the background technology, the present application provides a circulation device, an oil and gas well injection system and a method of use, aiming to solve the technical problem that the working fluid is easily in direct contact with the reservoir in the cleaning method of the related technology, which will affect the quality of the reservoir and thus reduce the oil and gas production.

[0006] In order to achieve the above-mentioned object, the present application provides a flow device for oil pipes of oil and gas wells, the flow device comprising a mounting pipe, a mounting seat, a one-way flow assembly and a ring kit;

[0007] The mounting seat is connected to the outer tube wall of the mounting tube, the mounting tube is used to communicate with the oil pipe, the ring sleeve is installed on the mounting seat, and is arranged around the outer side of a portion of the mounting tube, and together with the corresponding outer tube wall of the mounting tube, forms an annular area;

[0008] The mounting seat is provided with a conducting pipe communicating with the annular area, and the conducting pipe is communicated with the tube cavity of the mounting tube through a through hole provided on the tube wall of the mounting tube;

[0009] The one-way flow component is arranged in the conducting pipe, and controls the one-way flow of the liquid in the annular area to the lumen of the installation pipe.

[0010] In the above-mentioned circulation device, optionally, the mounting seat includes a plurality of mounting members, the plurality of mounting members are sequentially arranged along the outer circumference direction of the mounting tube, and each two adjacent mounting members abut against each other;

[0011] The conducting pipe is provided on each of the mounting parts.

[0012] In the above-mentioned flow device, optionally, the conducting pipe includes a first pipe section and a second pipe section, the first pipe section extends in a first direction, the second pipe section extends in a second direction, and the first direction intersects with the second direction;

[0013] The first pipe segment has a first end and a second end that are oppositely disposed, the first end is connected to the annular area, and the second end is connected to the second pipe segment; the second pipe segment has a third end and a fourth end that are oppositely disposed, the third end is connected to the first pipe segment, and the fourth end is connected to the tube cavity of the installation pipe;

[0014] The one-way flow component includes a first one-way flow component and a second one-way flow component. The first one-way flow component is located in the first pipe section and is disposed close to the first end; the second one-way flow component is located in the second pipe section and is disposed close to the third end.

[0015] In the above-mentioned circulation device, optionally, the first pipe segment includes a first sub-pipe segment and a second sub-pipe segment that are connected to each other, the first sub-pipe segment is close to the first end, the second sub-pipe segment is close to the second end, the diameter of the first sub-pipe segment is larger than the diameter of the second sub-pipe segment, and the first sub-pipe segment is connected to the annular area;

[0016] The first one-way flow member is located in the first sub-tube segment of the first tube segment.

[0017] In the above-mentioned circulation device, optionally, the second pipe segment includes a third sub-pipe segment and a fourth sub-pipe segment that are connected to each other, the third sub-pipe segment is close to the third end, the fourth sub-pipe segment is close to the fourth end, the diameter of the third sub-pipe segment is smaller than the diameter of the fourth sub-pipe segment, the third sub-pipe segment is connected to the second sub-pipe segment, and the fourth sub-pipe segment is connected to the tube cavity of the installation tube;

[0018] The second one-way flow member is located in the third sub-tube segment of the second tube segment.

[0019] In the above-mentioned circulation device, optionally, the first one-way circulation member includes a one-way valve core, an upper base, a sleeve and a lower base, the upper base, the sleeve and the lower base are connected in sequence, the sleeve is located between the upper base and the lower base, the upper base is close to the first end, and the lower base is close to the second end;

[0020] The upper base has a first conical groove, the lower base has a second conical groove, the sleeve has a through hole connecting the first conical groove and the second conical groove, and the one-way valve core is located in the through hole;

[0021] The first conical groove and the second conical groove each include a small diameter end and a large diameter end that are oppositely arranged, and the large diameter end of the first conical groove and the large diameter end of the second conical groove are both located on a side close to the sleeve.

[0022] In the above-mentioned circulation device, optionally, a mounting protrusion is provided on the mounting seat, the mounting protrusion is located at the bottom end of the mounting seat, and the mounting protrusion is used to protect the ring kit;

[0023] And / or, the ring set is an elastic member.

[0024] In the above-mentioned circulation device, optionally, a communication hole is provided at a position where the mounting seat is connected to the mounting tube, and the number of the communication holes is multiple, and the multiple communication holes are arranged in an array on the mounting tube.

[0025] In a second aspect, the present application further provides an oil and gas well injection system, comprising a casing, a liquid infusion device, the circulation device and a plurality of oil pipes, wherein the installation pipe of the circulation device is connected to two adjacent oil pipes, the casing is located in an oil and gas channel opened underground, and the installation pipe is located in the casing;

[0026] An upper annulus area and a lower annulus area are formed between the casing and the oil pipe, the annular area of ​​the circulation device is located between the upper annulus area and the lower annulus area, the upper annulus area is communicated with the annular area, and is also communicated with the infusion device.

[0027] In a third aspect, the present application also provides a method for using an oil and gas well injection system, which is used for an oil and gas well injection system. The method comprises:

[0028] Generate design solutions based on reservoir location;

[0029] Install the oil and gas well injection system according to the design scheme;

[0030] Controlling the liquid infusion device of the oil and gas well injection system to pass the liquid into the lumen of the installation pipe through the upper annular space, the annular area, the conducting pipe and the connecting hole;

[0031] The working time and working frequency of the infusion device are selected according to production characteristics.

[0032] The present application provides a circulation device, an oil and gas well injection system and a method of use. The circulation device is used for oil pipes in oil and gas wells. The circulation device includes a mounting pipe, a mounting seat, a one-way circulation component and a ring kit. The mounting seat is connected to the outer pipe wall of the mounting pipe, the mounting pipe is used to communicate with the oil pipe, the ring kit is installed on the mounting seat, and is arranged around the outer side of a portion of the mounting pipe, and together with the outer pipe wall of the corresponding mounting pipe, forms an annular area. The mounting seat is provided with a conducting pipe connected to the annular area, and the conducting pipe is connected to the pipe cavity of the mounting pipe through a through hole provided on the pipe wall of the mounting pipe; the one-way circulation component is arranged in the conducting pipe, and controls the one-way flow of liquid in the annular area to the pipe cavity of the mounting pipe. By setting a mounting seat to install a one-way circulation component and a ring kit, the structural stability of the circulation device can be improved; by using a mounting tube, the oil pipe can be connected so that the liquid enters the lumen of the oil pipe through the lumen of the mounting tube; by setting a ring kit, the ring kit can form an annular area together with the mounting seat and the outer tube wall of the mounting tube, and the annular area can accommodate liquid for cleaning; by setting a guiding circulation component, the liquid flowing into the lumen of the oil pipe can be controlled, and by controlling the flow rate of the liquid, an appropriate amount of liquid can be introduced into the oil pipe, thereby reducing the possibility of contact between the liquid and the reservoir, reducing the possibility of affecting the reservoir quality, and avoiding affecting the oil and gas production.

[0033] The structure of the present application and its other application objects and beneficial effects will be more clearly understood through the description of the preferred embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 A schematic diagram of the structure of the circulation device provided in the embodiment of the present application;

[0036] Figure 2 A schematic cross-sectional view of a flow device provided in an embodiment of the present application;

[0037] Figure 3 A schematic diagram of the structure of the mounting member and the mounting pipe of the flow device provided in the embodiment of the present application;

[0038] Figure 4 A schematic cross-sectional view of a mounting member and a mounting pipe of a flow device provided in an embodiment of the present application;

[0039] Figure 5 A schematic diagram of the structure of a second one-way flow member of a flow device provided in an embodiment of the present application;

[0040] Figure 6 A schematic diagram of the structure of a first one-way circulation member of a circulation device provided in an embodiment of the present application;

[0041] Figure 7 A flow chart of a method for using the oil and gas well injection system provided in an embodiment of the present application.

[0042] Description of reference numerals:

[0043] 100- circulation device;

[0044] 101-installation pipe;

[0045] 110-mounting seat;

[0046] 120-One-way flow assembly;

[0047] 130-Ring Kit;

[0048] Z-annular region;

[0049] 111-conducting pipeline;

[0050] 112-mounting parts;

[0051] 140-threaded member;

[0052] 1111-first pipe section;

[0053] 1112-second pipe section;

[0054] Y-first direction;

[0055] X-second direction;

[0056] 111A-first end;

[0057] 111B-second end;

[0058] 111C-third end;

[0059] 111D-4th end;

[0060] 121-first one-way flow member;

[0061] 122-second one-way flow member;

[0062] 1221-valve bonnet;

[0063] 1222-valve body;

[0064] 11111-first sub-pipe section;

[0065] 11112-second sub-pipe section;

[0066] 11121-the third sub-pipe section;

[0067] 11122-the fourth sub-pipe section;

[0068] 1211- one-way valve core;

[0069] 1212-upper base;

[0070] 1213-sleeve;

[0071] 1214-lower base;

[0072] 12121-first cone groove;

[0073] 12141-second cone groove;

[0074] a-small diameter end;

[0075] b-large diameter end;

[0076] 1121-installation protrusion;

[0077] 1011-Connecting hole.

[0078] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0079] In the related technology, a combination of prevention and treatment is used to clean the oil pipe. A large amount of working fluid is injected into the oil pipe for circulation cleaning, and the salt scale and wax blocks accumulated in the oil pipe are dissolved by the working fluid to complete the dredging. However, in the above-mentioned cleaning method, the working fluid is easy to come into direct contact with the reservoir, which will affect the quality of the reservoir and thus reduce the oil and gas production; the working fluid will affect the collection of oil and gas in the reservoir, which is easy to affect the efficiency of oil and gas collection, affect the normal output of oil and gas, and is not conducive to the normal operation of oil and gas wells.

[0080] Based on the above-mentioned technical problems, an embodiment of the present application provides a circulation device, an oil and gas well injection system and a method of use. The circulation device is used for the oil pipe of the oil and gas well, and the circulation device includes a mounting pipe, a mounting seat, a one-way circulation component and a ring kit; the mounting seat is connected to the outer pipe wall of the mounting pipe, the mounting pipe is used to communicate with the oil pipe, the ring kit is installed on the mounting seat, and is arranged around the outside of part of the mounting pipe, and together with the outer pipe wall of the corresponding mounting pipe, it forms an annular area; a conducting pipe connected to the annular area is provided on the mounting seat, and the conducting pipe is connected to the pipe cavity of the mounting pipe through a through hole provided on the pipe wall of the mounting pipe; the one-way circulation component is arranged in the conducting pipe, and controls the one-way flow of liquid in the annular area to the pipe cavity of the mounting pipe. By setting a mounting seat to install a one-way circulation component and a ring kit, the structural stability of the circulation device can be improved; by using a mounting tube, the oil pipe can be connected so that the liquid enters the lumen of the oil pipe through the lumen of the mounting tube; by setting a ring kit, the ring kit can form an annular area together with the mounting seat and the outer tube wall of the mounting tube, and the annular area can accommodate liquid for cleaning; by setting a guiding circulation component, the liquid flowing into the lumen of the oil pipe can be controlled, and by controlling the flow rate of the liquid, an appropriate amount of liquid can be introduced into the oil pipe, thereby reducing the possibility of contact between the liquid and the reservoir, reducing the possibility of affecting the reservoir quality, and avoiding affecting the oil and gas production.

[0081] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiment of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0082] In the description of the embodiments of the present application, it should be understood that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0083] Figure 1 A schematic diagram of the structure of the circulation device provided in the embodiment of the present application; Figure 2 A schematic cross-sectional view of a flow device provided in an embodiment of the present application; Figure 3A schematic diagram of the structure of the mounting member and the mounting pipe of the flow device provided in the embodiment of the present application; Figure 4 A schematic cross-sectional view of a mounting member and a mounting pipe of a flow device provided in an embodiment of the present application; Figure 5 A schematic diagram of the structure of a second one-way flow member of a flow device provided in an embodiment of the present application; Figure 6 A schematic structural diagram of a first one-way flow component of a flow device provided in an embodiment of the present application.

[0084] In the first aspect, an embodiment of the present application provides an oil and gas well injection system, including casing, an infusion device, a circulation device 100 and multiple oil pipes, the installation pipe of the circulation device 100 is connected to two adjacent oil pipes, the casing is located in an oil and gas channel opened underground, and the installation pipe 101 is located in the casing.

[0085] An upper annulus area and a lower annulus area are formed between the casing and the oil pipe. The annular area of ​​the circulation device is located between the upper annulus area and the lower annulus area. The upper annulus area is connected with the annular area and is also connected with the infusion device.

[0086] Specifically, there can be an upper annulus area and a lower annulus area between the casing and the oil pipe. The upper annulus area is close to the infusion device. The upper annulus area and the annular area are connected by liquid. The infusion device passes the liquid through the upper annulus area into the annular area Z formed by the circulation device 100 until the upper annulus area and the annular area Z are filled with liquid. The first one-way circulation component 121 can circulate the liquid. The liquid enters the first pipe section 1111 of the conductive pipe 111 under the action of hydraulic pressure and gravity. After the one-way circulation of the first one-way circulation component 121, the liquid flow rate changes and enters the second pipe section 1112 of the conductive pipe 111. Then, after the one-way circulation of the second one-way circulation component 122, the liquid flow rate further changes and enters the lumen of the installation pipe 101 through the second pipe section 1112, and finally enters the lumen of the oil pipe. The user can control the infusion device to pass an appropriate amount of liquid into the oil pipe, thereby reducing the possibility of contact between the liquid and the reservoir, reducing the possibility of affecting the reservoir quality, and avoiding affecting the oil and gas production.

[0087] It is understandable that the infusion device may be a liquid pump or other device that can push the liquid to flow. The embodiments of the present application do not limit the specific form of the infusion device, nor are they limited to the above examples.

[0088] It should be noted that during the operation of the oil and gas well injection system, the user can determine the pressure required for the circulation of the one-way circulation component through the production characteristics. The production characteristics may be relevant characteristics of the acquired oil and gas. The user can determine the required position of the oil pipe based on the acquired oil and gas, such as the concentration of the oil and gas, the purity of the oil and gas, etc., and install the circulation device at that position. Based on the required position, the pressure required for the circulation of the one-way circulation component of the circulation device at that position is obtained, thereby realizing the control of the liquid circulation by the circulation device.

[0089] Refer to the attached Figure 1 and attached Figure 2 As shown, in a second aspect, the embodiment of the present application further provides a circulation device 100, which can be used for oil pipes in oil and gas wells to control the liquid from entering the lumen of the installation pipe 101, thereby controlling the liquid from entering the lumen of the oil pipe.

[0090] It can be understood that the shape of the mounting tube 101 can be arbitrary. For example, the mounting tube 101 can be a cylindrical mounting tube 101, a rectangular mounting tube 101, a prismatic mounting tube 101, etc. The embodiment of the present application does not limit the specific shape of the mounting tube 101, nor is it limited to the above examples.

[0091] The following description will be made by taking the cylindrical shape of the mounting tube 101 as an example.

[0092] Correspondingly, the shape of the oil pipe may be the same as or different from the shape of the mounting pipe 101 . The following description will be made by taking the example that the shape of the oil pipe and the shape of the mounting pipe 101 are both cylindrical.

[0093] It should be noted that in order to improve the tightness of the connection between the oil pipe and the mounting pipe 101 and avoid the formation of a gap between the oil pipe and the mounting pipe 101 to affect the flow of liquid, the oil pipe and the mounting pipe 101 can be integrally formed.

[0094] It can be understood that the introduced liquid can be a mixture used to clean the installation pipe and the oil pipe. The mixture can include water and a cleaning agent, wherein the water can be cold water, warm water, hot water, or distilled water; the cleaning agent can include liquid potassium soap, sodium petroleum sulfate, benzyl alcohol, silicone oil, ethanol, lecithin, emulsifier, charcoal ash, etc. The embodiments of the present application do not limit the specific components of the mixture, nor are they limited to the above examples.

[0095] It should be noted that the introduced liquid may also include chemical reagents that react chemically with the reservoir to improve the purity and concentration of the obtained oil and gas. The embodiments of the present application do not limit the liquid components injected by the oil and gas well injection system, nor are they limited to the above examples.

[0096] Refer to the attached Figure 1 and attached Figure 2 As shown, specifically, the circulation device 100 may include a mounting tube 101, a mounting seat 110, a one-way circulation component 120 and a ring kit 130. The mounting seat 110 is connected to the outer tube wall of the mounting tube 101. The mounting tube 101 is used to communicate with the oil pipe. The ring kit 130 is installed on the mounting seat 110. The ring kit 130 is arranged around the outer side of part of the mounting tube 101 and together with the outer tube wall of the corresponding mounting tube 101, it forms an annular area Z.

[0097] It can be understood that the annular area Z can circulate liquid. Specifically, the annular area Z can be connected to an external infusion device through the upper annular space between the oil pipe and the casing. The infusion device passes the liquid into the annular area Z. The annular area Z can be used to carry the liquid and pass the liquid into the lumen of the installation pipe 101, and finally into the lumen of the oil pipe to clean the installation pipe 101 and the inside of the oil pipe.

[0098] Furthermore, a conducting pipe 111 connected to the annular area Z is provided on the mounting seat 110, and the conducting pipe 111 is connected to the lumen of the mounting tube 101 through a through hole provided on the tube wall of the mounting tube 101; the one-way flow component 120 is provided in the conducting pipe 111, and controls the one-way flow of the liquid in the annular area Z to the lumen of the mounting tube 101, and finally to the lumen of the oil pipe.

[0099] It should be noted that the embodiment of the present application does not limit the size of the installation pipe 101 and the ring kit 130, nor is it limited to the above example, that is, the size of the annular area Z is not limited, and is only used to connect the upper annular space area and the conductive pipe 111.

[0100] It can be understood that the direction of liquid circulation provided by the one-way circulation component 120 is one-way. For example, the direction in which the liquid can flow in the one-way circulation component 120 is from the annular area Z toward the lumen of the mounting tube 101. The one-way circulation component 120 can control whether the liquid enters the lumen of the mounting tube 101. By controlling the flow rate of the liquid, an appropriate amount of liquid can be passed into the mounting tube 101 and into the oil pipe, thereby reducing the possibility of liquid contacting the reservoir, reducing the possibility of affecting the reservoir quality, and avoiding affecting the oil and gas production.

[0101] It should be noted that the direction of liquid flow provided by the one-way flow component 120 may or may not change. Exemplarily, the one-way flow component 120 includes multiple one-way flow components, and the flow directions of the one-way flow components are different. By changing the direction of liquid flow, it is beneficial to buffer the flow velocity of the liquid and facilitate controlling the liquid flow into the installation pipe 101 and into the oil pipe; the flow directions of the one-way flow components are the same, and the liquid enters the installation pipe 101 and enters the oil pipe through multiple one-way flow components in the same direction, thereby reducing the possibility of liquid contact with the reservoir, reducing the possibility of affecting the reservoir quality, and avoiding affecting the oil and gas production.

[0102] Among them, the number of one-way flow components can be arbitrary. For example, the number of one-way flow components can be two, three, four, five, etc. The embodiment of the present application does not limit the number of one-way flow components, nor is it limited to the above examples.

[0103] The following description is made by taking the case where the number of the one-way flow components is two as an example, that is, the one-way flow component 120 includes two one-way flow components.

[0104] By setting the above-mentioned circulation device 100, the mounting seat 110 can improve the structural stability of the circulation device 100; through the mounting tube 101, the oil pipe can be connected, so that the liquid enters the lumen of the oil pipe through the lumen of the mounting tube 101; the ring kit 130 can form an annular area Z together with the mounting seat 110 and the outer tube wall of the mounting tube 101, and the annular area Z can accommodate liquid for cleaning; by setting the one-way circulation component 120, the direction of liquid circulation can be changed to buffer the flow rate of the liquid, and an appropriate amount of liquid can be introduced into the mounting tube 101 and into the oil pipe within a preset time, thereby reducing the possibility of liquid contact with the reservoir, reducing the possibility of affecting the reservoir quality, and avoiding affecting the oil and gas production.

[0105] Refer to the attached Figure 1 and attached Figure 2 As shown, as an optional embodiment, the mounting seat 110 includes a plurality of mounting members 112 , and the plurality of mounting members 112 are sequentially arranged along the circumferential direction of the mounting tube 101 , and each two adjacent mounting members 112 abut against each other; each mounting member 112 is provided with a conducting pipe 111 .

[0106] It is understandable that the plurality of mounting members 112 may be sequentially arranged along the radial circumferential direction of the mounting tube 101. Figure 3 and attached Figure 4 As shown, the conducting pipe 111 on each mounting member 112 can be connected to the same position of the mounting tube 101 along the axial direction. Correspondingly, the conducting pipe 111 of the mounting member 112 can be connected to the same position of the annular area Z along the axial direction. The liquid enters the tube cavity of the mounting tube 101 at the same position of the mounting tube 101 along the axial direction from the annular area Z through the conducting pipe 111, so as to facilitate the liquid to evenly clean the radial position of the mounting tube 101, thereby improving the cleaning effect, saving cleaning efficiency, and thereby reducing the amount of liquid used, reducing the possibility of liquid contact with the reservoir, reducing the possibility of affecting the reservoir quality, and avoiding affecting the oil and gas production.

[0107] It should be noted that the number of mounting parts 112 can be arbitrary. For example, the number of mounting parts 112 can be two, three, four, five, etc. The embodiment of the present application does not limit the number of mounting parts 112, nor is it limited to the above examples.

[0108] The following description takes the case where the number of the mounting members 112 is four as an example, that is, the mounting seat 110 includes four mounting members 112 .

[0109] It is understandable that two adjacent mounting members 112 may be welded to achieve mutual abutment, so as to avoid a gap between the two adjacent mounting members 112 and to avoid affecting the structural stability of the circulation device.

[0110] Furthermore, the mounting member 112 is fixed on the outer tube wall at the corresponding position of the mounting tube 101. Exemplarily, the mounting member 112 can be threadedly connected to the outer tube wall. For example, the mounting member 112 has a mounting hole for the threaded member to pass through, and the threaded member passes through the mounting hole and is threadedly connected to the outer tube wall of the mounting tube 101.

[0111] It should be noted that the threaded member 140 can be a pressurized locking screw, which can include a locking screw, a pressure cap and a gasket. The locking screw is pre-fabricated with an external thread, which can pass through the mounting hole of the mounting member 112 and be connected to the mounting tube 101. The pressure cap is pre-fabricated with an internal thread, which can be threadedly connected to the locking screw. The pressure cap is rotated and the gasket is compressed, so that the mounting member 112 is fitted with the mounting tube 101 to achieve assembly of the mounting seat 110 and the mounting tube 101.

[0112] By providing a mounting seat 110 including a plurality of mounting members 112 , the flow device 100 on the mounting tube 101 can be disassembled, that is, the mounting members 112 of the flow device 100 can be disassembled to install or disassemble the mounting seat 110 , the one-way flow assembly 120 and the ring set 130 of the flow device 100 .

[0113] As an optional implementation, the circulation device 100 further includes a sealing ring 150 . The sealing ring 150 may be disposed between the mounting member 112 and the mounting tube 101 to seal the gap between the mounting member 112 and the mounting tube 101 .

[0114] It should be noted that the number of sealing rings 150 can be arbitrary. For example, the number of sealing rings 150 can be one, two, three, four, etc. The embodiment of the present application does not limit the number of sealing rings 150, nor is it limited to the above examples.

[0115] The following description takes the case where there are two sealing rings 150 as an example. The two sealing rings may be located on two opposite sides of the mounting member 112 .

[0116] Refer to the attached Figure 4As shown, as an optional embodiment, the conducting pipe 111 includes a first pipe segment 1111 and a second pipe segment 1112, the extension direction of the first pipe segment 1111 is a first direction Y, the extension direction of the second pipe segment 1112 is a second direction X, and the first direction Y intersects with the second direction X; the first pipe segment 1111 has a first end 111A and a second end 111B that are relatively arranged, the first end 111A is connected to the annular area Z, and the second end 111B is connected to the second pipe segment 1112; the second pipe segment 1112 has a third end 111C and a fourth end 111D that are relatively arranged, the third end 111C is connected to the first pipe segment 1111, and the fourth end 111D is connected to the tube cavity of the installation tube 101.

[0117] It can be understood that the angle between the first direction Y and the second direction X can be arbitrary. For example, the angle between the first direction Y and the second direction X can be 15°, 30°, 45°, 60°, 75°, 90°, 105°, 120°, 135°, 150°, 165°, etc. The embodiment of the present application does not limit the specific angle between the first direction Y and the second direction X, nor is it limited to the above examples.

[0118] The following description is made by taking the angle between the first direction Y and the second direction X as 90° as an example.

[0119] The process of liquid entering the installation pipe 101 from the annular area Z is as follows:

[0120] The liquid enters the first pipe segment 1111 from the annular area Z through the first end 111A of the first pipe segment 1111, enters the second pipe segment 1112 from the second end 111B of the first pipe segment 1111, and finally enters the tube cavity of the installation tube 101 from the second end 111B of the second pipe segment 1112.

[0121] By setting the above-mentioned conducting pipe 111, the direction of liquid flow changes, which can buffer the flow rate of the liquid, so as to allow an appropriate amount of liquid to enter the installation pipe 101, reduce the possibility of liquid contact with the reservoir, reduce the possibility of affecting the reservoir quality, and avoid affecting the oil and gas production.

[0122] Refer to the attached Figure 2 As shown, as an optional embodiment, the one-way flow component 120 includes a first one-way flow member 121 and a second one-way flow member 122. The first one-way flow member 121 is located in the first pipe segment 1111 and is arranged close to the first end 111A; the second one-way flow member 122 is located in the second pipe segment 1112 and is arranged close to the second end 111B.

[0123] The process of liquid entering the installation pipe 101 from the annular area Z is as follows:

[0124] The liquid enters the first pipe segment 1111 from the annular area Z through the first end 111A of the first pipe segment 1111, passes through the first one-way flow component 121, and then flows unidirectionally from the second end 111B of the first pipe segment 1111 to the second pipe segment 1112, passes through the second one-way flow component 122, and then flows unidirectionally from the second end 111B of the second pipe segment 1112 to the tube cavity of the mounting tube 101.

[0125] It should be noted that the second one-way flow member 122 can be a limit check one-way valve to prevent the liquid in the installation tube 101 from entering the conducting pipe 111, reducing the purity of the liquid in the conducting pipe 111 and the annular area Z, thereby affecting the cleaning ability of the liquid.

[0126] Refer to the attached Figure 5 As shown, further referring to the accompanying drawings, the second one-way flow member 122 can be composed of a valve cap 1221 and a valve body 1222. The valve cap 1221 includes a limit column and a slide rail, the limit column can form a channel for circulating liquid, the slide rail is slidably connected to the valve body 1222, and the valve body 1222 is threadedly connected to the mounting member 112.

[0127] Refer to the attached Figure 4 As shown, as an optional embodiment, the first pipe segment 1111 includes a first sub-pipe segment 11111 and a second sub-pipe segment 11112 which are interconnected, the first sub-pipe segment 11111 is close to the first end 111A, the second sub-pipe segment 11112 is close to the second end 111B, and the first sub-pipe segment 11111 is connected to the annular area Z; the first one-way flow member 121 is located in the first sub-pipe segment 11111 of the first pipe segment 1111.

[0128] It can be understood that the shapes of the first sub-segment 11111 and the second sub-segment 11112 can be arbitrary. For example, the shape of the first sub-segment 11111 can be cylindrical, and the shape of the second sub-segment 11112 can be rectangular. In another example, the shape of the first sub-segment 11111 can be rectangular, and the shape of the second sub-segment 11112 can be rectangular. In another example, the shape of the first sub-segment 11111 can be cylindrical, and the shape of the second sub-segment 11112 can be cylindrical, and so on.

[0129] The embodiment of the present application does not limit the specific shapes of the first sub-segment 11111 and the second sub-segment 11112, nor is it limited to the above examples.

[0130] The following description is made by taking the example that the first sub-segment 11111 and the second sub-segment 11112 are both cylindrical.

[0131] Refer to the attached Figure 4As shown, further, the diameter of the first sub-segment 11111 is greater than the diameter of the second sub-segment 11112, that is, in the radial direction of the installation pipe 101, the cross-sectional area of ​​the first sub-segment 11111 is greater than the cross-sectional area of ​​the second sub-segment 11112, and when the axial dimension of the first sub-segment 11111 is the same as the axial dimension of the second sub-segment 11112, the liquid flow rate flowing through the first sub-segment 11111 is greater than the liquid flow rate flowing through the second sub-segment 11112, and when the liquid passes through the first one-way flow component 120 of the first sub-segment 11111, the liquid flow rate decreases, and when entering the second sub-segment 11112, the liquid flow rate decreases again, so that the user can easily introduce an appropriate amount of liquid into the installation pipe 101, reduce the possibility of liquid contact with the reservoir, reduce the possibility of affecting the reservoir quality, and avoid affecting the oil and gas production.

[0132] Refer to the attached Figure 4 As shown, as an optional embodiment, the second pipe segment 1112 includes a third sub-segment 11121 and a fourth sub-segment 11122 which are interconnected, the third sub-segment 11121 is close to the third end 111C, the fourth sub-segment 11122 is close to the fourth end 111D, the third sub-segment 11121 is connected to the second sub-segment 11112, and the fourth sub-segment 11122 is connected to the tube cavity of the mounting tube 101; the second one-way flow member 122 is located in the third sub-segment 11121 of the second pipe segment 1112.

[0133] It can be understood that the shapes of the third sub-segment 11121 and the fourth sub-segment 11122 can be arbitrary. For example, the shape of the third sub-segment 11121 can be cylindrical, and the shape of the fourth sub-segment 11122 can be rectangular. In another example, the shape of the third sub-segment 11121 can be rectangular, and the shape of the fourth sub-segment 11122 can be rectangular. In another example, the shape of the third sub-segment 11121 can be cylindrical, and the shape of the fourth sub-segment 11122 can be cylindrical, and so on.

[0134] The embodiment of the present application does not limit the specific shapes of the third sub-segment 11121 and the fourth sub-segment 11122, nor is it limited to the above examples.

[0135] The following description is made by taking the example that the third sub-segment 11121 and the fourth sub-segment 11122 are both cylindrical.

[0136] Refer to the attached Figure 4As shown, further, the diameter of the third sub-segment 11121 is smaller than the diameter of the fourth sub-segment 11122, that is, in the axial direction of the mounting tube 101, the cross-sectional area of ​​the third sub-segment 11121 is smaller than the cross-sectional area of ​​the fourth sub-segment 11122, and when the axial dimension of the third sub-segment 11121 is the same as the axial dimension of the fourth sub-segment 11122, the liquid flow rate flowing through the third sub-segment 11121 is smaller than the liquid flow rate flowing through the fourth sub-segment 11122, and when the liquid passes through the second one-way circulation component 120 of the third sub-segment 11121, the liquid flow rate decreases, and then when entering the fourth sub-segment 11122, the liquid flow rate increases, which facilitates the liquid to enter the tube cavity of the mounting tube 101, and can reduce the time required for the liquid to circulate in the circulation device 100 while achieving liquid flow rate buffering, so as to facilitate cleaning of the mounting tube 101.

[0137] See attached Figure 2 and attached Figure 6 As shown, as an optional embodiment, the first one-way circulation member 121 includes a one-way valve core 1211, an upper base 1212, a sleeve 1213 and a lower base 1214, the upper base 1212, the sleeve 1213 and the lower base 1214 are connected in sequence, the sleeve 1213 is located between the upper base 1212 and the lower base 1214, the upper base 1212 is close to the first end 111A, and the lower base 1214 is close to the second end 111B; the upper base 1212 has a first cone groove 12121, the lower base 1214 has a second cone groove 12141, the sleeve 1213 has a through hole connecting the first cone groove 12121 and the second cone groove 12141, and the one-way valve core 1211 is located in the through hole.

[0138] Specifically, the process of liquid entering the second pipe section 1112 from the annular area Z through the first one-way flow member 121 is as follows:

[0139] The liquid enters the first pipe section 1111 from the annular region Z through the first end 111A of the first pipe section 1111, passes through the upper base 1212, the one-way valve core 1211 and the lower base 1214 of the first one-way flow member 121 in sequence, and then flows into the second pipe section 1112 from the second end 111B of the first pipe section 1111 in one-way flow. By providing the first one-way flow member 121 including the upper base 1212, the one-way valve core 1211 and the lower base 1214, the one-way valve core 1211 can be located between the upper base 1212 and the lower base 1214, the one-way valve core 1211 has good structural stability, and can better achieve one-way flow of the liquid.

[0140] Furthermore, the first conical groove 12121 and the second conical groove 12141 each include a small diameter end a and a large diameter end b that are relatively arranged, and the large diameter end b of the first conical groove 12121 and the large diameter end b of the second conical groove 12141 are both located on a side close to the sleeve 1213 .

[0141] Furthermore, the process of liquid entering the second pipe section 1112 from the annular area Z through the first one-way flow member 121 is as follows:

[0142] The liquid enters the first pipe section 1111 from the annular region Z through the first end 111A of the first pipe section 1111, passes through the small diameter end a of the upper base 1212 of the first one-way flow member 121, the large diameter end b of the upper base 1212, the one-way valve core 1211, the large diameter end b of the lower base 1214, and the small diameter end a of the lower base 1214 in sequence, and then flows into the second pipe section 1112 from the second end 111B of the first pipe section 1111 in one-way flow. By providing the above-mentioned upper base 1212 and lower base 1214, the flow rate of the liquid can be further adjusted, so that the liquid can stably pass through the one-way valve core 1211, and the one-way flow of the liquid can be better achieved.

[0143] See attached Figure 1 -Attached Figure 4 As shown, as an optional embodiment, the mounting seat 110 is provided with a mounting protrusion 1121, and the mounting protrusion 1121 is located at the bottom end of the mounting seat 110. It can be understood that when the mounting tube 101 extends in the vertical direction, the mounting protrusion 1121 can be located at the bottom end of the mounting seat 110 to protect the ring kit 130; when the mounting tube 101 extends in the horizontal direction, the mounting protrusion 1121 can be located at the front end of the mounting tube 101 in the deep direction.

[0144] Furthermore, the mounting protrusion 1121 is used to protect the ring kit 130, that is, in the diameter direction of the mounting tube 101, the maximum outer diameter of the mounting protrusion 1121 is larger than the maximum outer diameter of the ring kit 130, and thus the mounting protrusion 1121 can protect the ring kit 130 to avoid damage to the ring kit 130 and affect the annular area Z containing the liquid; at the same time, in the process of the oil pipe and the mounting tube 101 going deep into the ground, the mounting protrusion 1121 can scrape off burrs and other adverse factors on the inner wall of the casing to avoid damage to the ring kit.

[0145] It should be noted that the specific form of the mounting protrusion 1121 can be arbitrary. For example, the mounting protrusion 1121 can be an arc block, and the maximum outer diameter of the arc block is greater than the maximum outer diameter of the ring set 130; the mounting protrusion 1121 can also be an annular block, and the maximum outer diameter of the annular block is greater than the maximum outer diameter of the ring set 130; the mounting protrusion 1121 can also be a column, and the dimension of the distance from the end of the column away from the mounting seat to the center of the oil pipe is greater than the maximum outer diameter of the ring set 130, etc. The embodiments of the present application do not limit the specific form of the mounting protrusion 1121, nor are they limited to the above examples.

[0146] The following description will be made by taking the mounting protrusion 1121 as an annular block as an example.

[0147] As an optional embodiment, the ring set 130 is an elastic member. Exemplarily, the ring set 130 can be a rubber ring set 130. The embodiment of the present application does not limit the material of the ring set 130, nor is it limited to the above example. By setting the ring set 130 as an elastic member, the ring set 130 can be deformed when carrying liquid, and can thus accommodate more liquid.

[0148] Specifically, a portion of the ring sleeve 130 is sleeved around the mounting base 110 and can be fixed on the mounting base 110; another portion of the ring sleeve 130 forms an annular area Z with the outer side of a portion of the conductive mounting tube 101 to accommodate more liquid.

[0149] It can be understood that when the ring set 130 carries liquid, the ring set 130 is deformed and can abut against the inner wall of the casing, thereby isolating the upper annulus area from the lower annulus area; when the liquid pressure in the reservoir is too large, the liquid can exert pressure on the ring set 130 from the lower annulus area, so that a gap is formed between the ring set 130 and the inner wall of the casing, and then liquid or gas with a certain pressure can be discharged to the ground through the lower annulus area and the upper annulus area, thereby ensuring the pressure balance underground.

[0150] See attached Figure 1 and attached Figure 2 As shown, as an optional embodiment, a connecting hole 1011 is provided at the position where the mounting tube 101 is connected to the circulation device 100 . There are multiple connecting holes 1011 , and the multiple connecting holes 1011 are arranged in an array on the mounting tube 101 .

[0151] Specifically, the connecting holes 1011 arranged in an array are connected to the second pipe section 1112 at the same time, so that the liquid flowing out unidirectionally from the second one-way flow member 122 can be diverted to form a uniform and fine liquid, which is convenient for cleaning the installation pipe 101.

[0152] Figure 7 A flow chart of a method for using the oil and gas well injection system provided in an embodiment of the present application.

[0153] See attached Figure 7 As shown, in a third aspect, the embodiment of the present application further provides a method for using an oil and gas well injection system, comprising:

[0154] S100: Generate a design plan according to the reservoir location.

[0155] Specifically, the reservoir position can be the depth of the reservoir from the ground, and the coordinate position corresponding to the ground, that is, the reservoir position can include the horizontal position and vertical position of the reservoir relative to the ground. The design plan includes the length of the casing, the length of the mounting pipe 101 and the position of the circulation device 100, etc.

[0156] S. Install the oil and gas well injection system according to the design plan.

[0157] Specifically, the installation of the oil and gas well injection system can be to connect the installation pipe of the circulation device 100 of the oil and gas well injection system with the oil pipe of the oil and gas well injection system, and place it in the casing of the oil and gas well injection system, the oil pipe and the circulation device 100 are located in the casing, and the infusion device is connected to the circulation device 100 through the upper annulus area and the annular area Z. The infusion device can be located on the ground, and the casing, oil pipe and circulation device 100 are all located underground to process the reservoir underground and obtain oil and gas.

[0158] S300, controlling the liquid infusion device of the oil and gas well injection system to pass the liquid into the lumen of the oil pipe through the upper annulus area, the annular area, the conducting pipe and the connecting hole.

[0159] Specifically, the liquid enters between the inner wall of the casing and the outer wall of the oil pipe, i.e., the upper annulus area, through the infusion device. As the liquid increases, the annular sleeve 130 deforms and accommodates the liquid, gradually forming a liquid channel and annular area Z that are interconnected. The infusion device continues to infuse the liquid, the liquid channel circulates, and generates hydraulic pressure, so that the liquid in the annular area Z enters the lumen of the mounting tube 101 through the first one-way flow component 121 and the second one-way flow component 122, and finally enters the lumen of the oil pipe.

[0160] S400, selecting the working time and working frequency of the infusion device according to production characteristics.

[0161] Specifically, the production characteristics may include the scaling condition inside the mounting tube 101, and may also include the structural strength of the mounting tube 101, etc. The infusion device may periodically input liquid, that is, the infusion time and frequency may be controlled according to actual conditions to better clean the mounting tube 101.

[0162] It should be noted that the user can obtain production characteristics based on experience to control the infusion device; or the user can obtain production characteristics through a detection device, which can detect the structural information of the installation pipe 101 and the oil pipe in real time, such as detecting the thickness of the installation pipe 101 and the oil pipe to correspond to the scaling conditions in the installation pipe 101 and the oil pipe. It is understandable that the detection device can be any device with detection function, such as a sensor, etc. The embodiment of the present application does not limit the specific implementation of the detection device, nor is it limited to the above examples.

[0163] It should be noted that the production characteristics can be relevant characteristics of the acquired oil and gas. The user can judge the wall conditions of the oil pipe and the installation pipe 101 based on the acquired oil and gas, such as the concentration of oil and gas, the purity of oil and gas, etc., and then adjust the infusion device of the oil and gas well injection system.

[0164] The terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application. In the description of the present application, "plurality" means two or more, unless otherwise specified.

[0165] The terms "first", "second", "third", "fourth", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0166] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A circulation device, characterized in that: A tubing for oil and gas wells, the circulation device comprising a mounting pipe, a mounting seat, a one-way circulation assembly and a ring kit; The mounting seat comprises a plurality of mounting parts, which are arranged in sequence along the outer circumference of the mounting tube, and each two adjacent mounting parts abut against each other; Each of the mounting parts is provided with a conducting pipe; Wherein, the conducting pipe on each mounting member is connected to the same position of the mounting tube along the axial direction, and correspondingly, the conducting pipe of the mounting member is connected to the same position of the annular area along the axial direction; The mounting seat is connected to the outer tube wall of the mounting tube, the mounting tube is used to communicate with the oil pipe, the ring sleeve is installed on the mounting seat, and is arranged around the outer side of a portion of the mounting tube, and together with the corresponding outer tube wall of the mounting tube, forms an annular area; The mounting seat is provided with a conducting pipe communicating with the annular area, and the conducting pipe is communicated with the tube cavity of the mounting tube through a through hole provided on the tube wall of the mounting tube; The one-way flow component is arranged in the conducting pipe and controls the flow rate of the liquid in the annular area to flow one-way to the lumen of the installation pipe; The conducting pipe comprises a first pipe section, wherein the first pipe section has a first end and a second end which are arranged opposite to each other; The one-way flow assembly comprises a first one-way flow member, the first one-way flow member comprises a one-way valve core, an upper base, a sleeve and a lower base, the upper base, the sleeve and the lower base are connected in sequence, the sleeve is located between the upper base and the lower base, the upper base is close to the first end, and the lower base is close to the second end; The upper base has a first conical groove, the lower base has a second conical groove, the sleeve has a through hole connecting the first conical groove and the second conical groove, and the one-way valve core is located in the through hole; The first conical groove and the second conical groove each include a small diameter end and a large diameter end that are oppositely arranged, and the large diameter end of the first conical groove and the large diameter end of the second conical groove are both located on a side close to the sleeve.

2. The circulation device according to claim 1, characterized in that: The conducting pipe further includes a second pipe segment, the first pipe segment extends in a first direction, the second pipe segment extends in a second direction, and the first direction intersects with the second direction; The first end is connected to the annular area, and the second end is connected to the second pipe section; The second pipe section has a third end and a fourth end that are arranged opposite to each other, the third end is connected to the first pipe section, and the fourth end is connected to the lumen of the installation pipe; The one-way flow component further includes a second one-way flow member, wherein the first one-way flow member is located in the first pipe section and is disposed close to the first end; the second one-way flow member is located in the second pipe section and is disposed close to the third end.

3. The circulation device according to claim 2, characterized in that: The first pipe segment includes a first sub-pipe segment and a second sub-pipe segment that are connected to each other, the first sub-pipe segment is close to the first end, the second sub-pipe segment is close to the second end, the diameter of the first sub-pipe segment is larger than the diameter of the second sub-pipe segment, and the first sub-pipe segment is connected to the annular area; The first one-way flow member is located in the first sub-tube segment of the first tube segment.

4. The circulation device according to claim 3, characterized in that: The second pipe segment includes a third sub-pipe segment and a fourth sub-pipe segment that are connected to each other, the third sub-pipe segment is close to the third end, the fourth sub-pipe segment is close to the fourth end, the diameter of the third sub-pipe segment is smaller than the diameter of the fourth sub-pipe segment, the third sub-pipe segment is connected to the second sub-pipe segment, and the fourth sub-pipe segment is connected to the tube cavity of the installation pipe; The second one-way flow member is located in the third sub-tube segment of the second tube segment.

5. The flow device according to any one of claims 1 to 4, characterized in that: The mounting seat is provided with a mounting protrusion, the mounting protrusion is located at the bottom end of the mounting seat, and the mounting protrusion is used to protect the ring kit; And / or, the ring set is an elastic member.

6. The flow device according to any one of claims 1 to 4, characterized in that: A communicating hole is provided at a position where the mounting seat communicates with the mounting tube. There are a plurality of communicating holes, and the plurality of communicating holes are arranged in an array on the mounting tube.

7. An oil and gas well injection system, characterized in that: It comprises a casing, a liquid infusion device, a circulation device as claimed in any one of claims 1 to 6, and a plurality of oil pipes, wherein the installation pipe of the circulation device is connected with two adjacent oil pipes, the casing is located in an oil and gas channel opened underground, and the installation pipe is located in the casing; An upper annulus area and a lower annulus area are formed between the casing and the oil pipe, the annular area of ​​the circulation device is located between the upper annulus area and the lower annulus area, the upper annulus area is communicated with the annular area, and is also communicated with the infusion device.

8. A method for using an oil and gas well injection system, characterized in that: For the oil and gas well injection system according to claim 7, the method of use comprises: Generate design solutions based on reservoir location; Install the oil and gas well injection system according to the design scheme; Controlling the liquid infusion device of the oil and gas well injection system to pass the liquid into the lumen of the oil pipe through the upper annular space, the annular area, the conducting pipe and the connecting hole; The working time and working frequency of the infusion device are selected according to production characteristics.

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