An injection-production integrated flow control screen pipe and pipe column system

Abstract

The application discloses an injection-production integrated flow control screen pipe and a pipe column system, and the flow control screen pipe comprises an outer pipe connected with a screen pipe at one end, a joint arranged in the outer pipe, a flow channel arranged on the joint and communicating the inner side and the outer side of the joint, a first opening and closing assembly and a plurality of second opening and closing assemblies arranged on the flow channel; when steam injection is required in the formation, the steam reaches the bottom of the well, the first opening and closing assembly drives and opens the flow channel between the inner side of the joint and the second opening and closing assembly, pushes the second opening and closing assembly to open the flow channel between the first opening and closing assembly and the outer side of the joint, and enters the formation from the screen pipe interlayer under the guidance of the flow channel, so that the pipe column injection and production integration is realized, the demand for steam injection or injection of other media in part oil and gas wells is met, the application range is expanded, and the post-operation is facilitated; when the heavy oil well of thermal recovery is operated, the workover fluid is effectively prevented from entering the formation during the workover operation, the cold damage and other pollution of the workover fluid to the formation are avoided, the applicability is high, and the operation is reliable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil production, in particular to an injection-production integrated flow control screen pipe and pipe string system. BACKGROUND

[0002] The information provided in this section is for the purpose of generally presenting the context of the disclosure. To the extent that the descriptions in this section describe the work of the inventors, and to the extent that the descriptions are not considered prior art by themselves or in combination with other prior art, they are not an admission that the field investigated is the field of the disclosure, either expressly or by implication.

[0003] At present, the flow control screen pipe and pipe string in the technical field of oil production mainly include ICD water control screen pipe, AICD water control screen pipe, etc., which can realize the purpose of water control and oil stabilization by adjusting the liquid production profile. Among them, the AICD water control screen pipe is widely used because it has the characteristics of automatically adjusting the flow pressure difference according to the different viscosities of oil and water.

[0004] The core tool of the AICD water control screen pipe is the AICD water control device, mainly including the floating disc type and the flow channel type. The floating disc type cannot realize the injection function, and the flow channel type has small holes and high injection pressure. When steam injection or other medium injection is required in the later stage of the oil and gas well, the function cannot be realized. Therefore, the AICD water control pipe string has poor applicability for heavy oil thermal recovery wells or oil and gas wells with injection requirements in the later stage. SUMMARY

[0005] In view of the defects in the prior art, the present application provides an injection-production integrated flow control screen pipe and pipe string system to solve the problems of no injection function and poor applicability of the AICD water control screen pipe in the prior art.

[0006] The above-mentioned purposes of the present application are mainly achieved by the following technical solutions:

[0007] An injection-production integrated flow control screen pipe, comprising:

[0008] an outer pipe, one end of the outer pipe being used for connecting a screen pipe;

[0009] a joint, the joint being fixedly connected in the outer pipe, a sealing sleeve being arranged on the inner side of the joint, a water control device being arranged between the joint and the screen pipe, a flow channel being arranged on the joint and communicating the inner side and the outer side of the joint, a first opening and closing assembly and a plurality of second opening and closing assemblies being arranged on the flow channel;

[0010] The first opening and closing assembly is configured to be able to conduct or close the flow channel between the inner side of the joint and the second opening and closing assembly;

[0011] The second opening and closing assembly is configured to be able to conduct or close the flow channel between the first opening and closing assembly and the outer side of the joint.

[0012] In an optional embodiment, the first opening and closing assembly comprises a sealing rod reciprocally movable in the joint, the sealing rod is provided with a through hole, and when the sealing rod moves to a position where the through hole corresponds to the flow channel, the first opening and closing assembly opens the flow channel.

[0013] In an optional embodiment, the first opening and closing assembly further comprises a plug and a first elastic member, the plug is fixedly arranged on the joint, the first elastic member is connected between the sealing rod and the plug, and the first elastic member is used to push the sealing rod to move to a position where the through hole is misaligned with the flow channel.

[0014] In an optional embodiment, a first cavity is arranged between one end of the sealing rod and the joint, and the first cavity is provided with a first liquid capable of expanding by absorbing heat, so that the first liquid pushes the sealing rod to move to a position where the through hole corresponds to the flow channel after the first liquid expands by absorbing heat.

[0015] In an optional embodiment, the second opening and closing assembly comprises a base fixedly connected to the joint and a connecting seat, the second opening and closing assembly is provided with a working channel, and the base is provided with a sealing head reciprocally movable thereon, and the sealing head is provided with a second elastic member used to drive the sealing head to close the working channel.

[0016] In an optional embodiment, the working channel comprises a first through hole arranged on the base, an intermediate cavity arranged between the base and the connecting seat, and a second through hole arranged on the connecting seat, and the second elastic member pushes the sealing head to block the second through hole, so that liquid or gas can push the sealing head to move from the second through hole and sequentially enter the intermediate cavity and the first through hole.

[0017] In an optional embodiment, the joint is provided with a stepped groove, the connecting seat is threadedly connected in the stepped groove, and the stepped groove and the connecting seat are respectively provided with abutting tapered surfaces.

[0018] In an optional embodiment, the water control device is arranged between the joint and the screen pipe through a water control joint, and the water control joint is threadedly connected to the joint and the screen pipe respectively.

[0019] In an optional embodiment, the water control device is provided with a soluble sealing ring close to one end of the joint, and the soluble sealing ring can seal the water control device before being dissolved.

[0020] Based on the same inventive concept, the application further provides a pipe string system comprising the above-mentioned injection and production integrated flow control screen pipe.

[0021] Compared with the prior art, the application has the advantages that:

[0022] The flow control screen pipe in the application comprises an outer pipe connected to one end of a screen pipe, a joint arranged in the outer pipe, a sealing sleeve arranged on the inner side of the joint, a water control device arranged between the joint and the screen pipe, a flow channel arranged on the joint to communicate the inner side of the joint with the outer side of the joint, a first opening and closing component and a plurality of second opening and closing components arranged on the flow channel, the first opening and closing component being configured to open or close the flow channel between the inner side of the joint and the second opening and closing component, and the second opening and closing component being configured to open or close the flow channel between the first opening and closing component and the outer side of the joint, when the formation needs to be injected with steam, the steam reaches the bottom of the well, the first opening and closing component drives and opens the flow channel between the inner side of the joint and the second opening and closing component, and pushes the second opening and closing component to open the flow channel between the first opening and closing component and the outer side of the joint, and under the guidance of the flow channel, the steam enters the formation from the screen pipe interlayer, realizing the integration of pipe column injection and production, meeting the needs of steam injection or injection of other media in part of the oil and gas wells, expanding the application range on the basis of the AICD water control device, facilitating the later operation, effectively preventing the workover fluid from entering the formation during the workover operation of the thermal recovery heavy oil well, avoiding the cold damage and other pollution of the workover fluid to the formation, and being suitable for the heavy oil thermal recovery well or the oil and gas well with injection needs in the later period, and being reliable in operation. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 A partial cross-sectional view of the flow control screen pipe provided in the embodiments of the application is shown in the drawings.

[0025] Figure 2 A partial enlarged view of the flow control screen pipe provided in the embodiments of the application is shown in the drawings. Figure 1

[0026] Figure 3 A partial enlarged view of the first opening and closing component provided in the embodiments of the application is shown in the drawings.

[0027] Figure 4 A partial enlarged view of the second opening and closing component provided in the embodiments of the application is shown in the drawings.

[0028] ​In the diagram: 100, outer tube; 200, connector; 201, stepped groove; 202, conical surface; 203, flow channel; 204, sealing sleeve; 300, first opening / closing assembly; 301, sealing rod; 302, through hole; 303, plug; 304, first elastic element; 305, first cavity; 400, second opening / closing assembly; 401, base; 402, connecting seat; 403, sealing head; 404, second elastic element; 405, first perforation; 406, intermediate cavity; 407, second perforation; 500, water control device; 501, soluble sealing ring; 502, water control connector; 600, screen tube. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the description of these embodiments is intended to aid in understanding the invention, but does not constitute a limitation thereof. The specific structural and functional details disclosed herein are merely for describing exemplary embodiments of the invention. However, the invention can be embodied in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0030] Figure 1 This is a partial cross-sectional view of the flow control screen provided in an embodiment of this application; Figure 2 Provided for embodiments of this application Figure 1 A magnified view of a portion of the image; Figure 3 A partially enlarged schematic diagram of the first opening / closing component is provided for the embodiments of this application; Figure 4 A partially enlarged schematic diagram of the second opening / closing component is provided for the embodiments of this application.

[0031] like Figure 1 As shown, a flow control screen tube integrating injection and production is provided. In an optional embodiment, the flow control screen tube includes an outer tube 100 and a connector 200, wherein:

[0032] One end of the outer tube 100 is used to connect to the screen tube 600. When the outer tube 100 is connected to the screen tube 600, the stability of the connection position can be increased by setting a screen tube 600 connector. While the screen tube 600 connector is threadedly connected to the outer tube 100, it can be welded at the edge of the connection position to increase reliability. The screen tube 600 connector is fixedly connected to the screen tube 600, and there are circumferentially spaced channels between the screen tube 600 connector and the screen tube 600 to maintain a stable connection and achieve communication with the outer bottom layer. In addition, multiple spaced sealing rings are provided between the screen tube 600 connector and the screen tube 600 to improve the sealing performance of the connection.

[0033] The joint 200 is fixedly connected in the outer tube 100, a sealing sleeve 204 is arranged inside the joint 200, a water control device 500 is arranged between the joint 200 and the screen pipe 600, a flow channel 203 is arranged on the joint 200 to communicate the inside and outside of the joint 200, a first opening and closing assembly 300 and a plurality of second opening and closing assemblies 400 are arranged on the flow channel 203. Specifically, the flow channel 203 is arranged in the inner wall of the joint 200, and is formed in conjunction with the assembly of the joint 200, the outer tube 100 and the sealing sleeve 204. In detail, the flow channel 203 can be machined on the outer wall of the joint 200 and form part of the flow channel 203 after the assembly of the outer tube 100 and the joint 200, a radial extending hole groove can be arranged in the joint 200 to form part of the flow channel 203, and the flow channel 203 can be machined on the inner wall of the joint 200 and form part of the flow channel 203 after the assembly of the joint 200 and the sealing sleeve 204.

[0034] The water control device 500 is an AICD water control device 500, which aims to improve the production efficiency of the oil well and optimize the water-oil ratio. The AICD water control device 500 is widely used in oil fields, especially in the exploitation of water-bearing oil layers, to reduce the production of water and improve the overall oil production rate of the oil well.

[0035] The joint 200 and the sealing sleeve 204 are arranged in sequence inside the outer tube 100, the joint 200 and the outer tube 100 are welded to improve the sealing performance, and a plurality of sealing rings are arranged between the outer wall of the joint 200 and the inner wall of the outer tube 100 to improve the sealing performance. Specifically, rubber sealing rings can be used to improve the sealing performance after assembly, and sealing rings are also arranged between the sealing sleeve 204 and the joint 200. In order to maintain the positioning accuracy of the sealing ring, annular grooves are arranged on the outer wall and the inner wall of the joint 200 to accommodate the sealing ring, so that the sealing ring can accurately play a sealing role at the target position.

[0036] As shown in Figure 2 The joint 200 is fixedly connected in the outer tube 100, a sealing sleeve 204 is arranged inside the joint 200, a water control device 500 is arranged between the joint 200 and the screen pipe 600, a flow channel 203 is arranged on the joint 200 to communicate the inside and outside of the joint 200, a first opening and closing assembly 300 and a plurality of second opening and closing assemblies 400 are arranged on the flow channel 203. Specifically, the flow channel 203 is arranged in the inner wall of the joint 200, and is formed in conjunction with the assembly of the joint 200, the outer tube 100 and the sealing sleeve 204. In detail, the flow channel 203 can be machined on the outer wall of the joint 200 and form part of the flow channel 203 after the assembly of the outer tube 100 and the joint 200, a radial extending hole groove can be arranged in the joint 200 to form part of the flow channel 203, and the flow channel 203 can be machined on the inner wall of the joint 200 and form part of the flow channel 203 after the assembly of the joint 200 and the sealing sleeve 204.

[0037] It should be noted that the plurality of second opening and closing assemblies 400 arranged in series in the flow channel 203, that is, when one second opening and closing assembly 400 has a sealing gap due to impurities and other factors, other second opening and closing assemblies 400 also provide a stable sealing state at the subsequent position of the flow channel 203, thereby effectively maintaining the flow control effect.

[0038] In an optional embodiment, the working principle of the flow control screen pipe in the application is that an outer pipe 100 connected to a screen pipe 600 at one end is provided with a connector 200 inside the outer pipe 100, a sealing sleeve 204 is arranged on the inner side of the connector 200, a water control device 500 is arranged between the connector 200 and the screen pipe 600, a flow channel 203 is arranged on the connector 200 to communicate the inner side and the outer side of the connector 200, a first opening and closing assembly 300 and a plurality of second opening and closing assemblies 400 are arranged on the flow channel 203, the first opening and closing assembly 300 is configured to open or close the flow channel 203 between the inner side of the connector 200 and the second opening and closing assembly 400, the second opening and closing assembly 400 is configured to open or close the flow channel 203 between the first opening and closing assembly 300 and the outer side of the connector 200, when the formation needs to be injected with steam, the steam reaches the bottom of the well, the first opening and closing assembly 300 drives and opens the flow channel 203 between the inner side of the connector 200 and the second opening and closing assembly 400, and pushes the second opening and closing assembly 400 to open the flow channel 203 between the first opening and closing assembly 300 and the outer side of the connector 200, and enters the formation from the screen pipe 600 under the guidance of the flow channel 203, realizing the integration of pipe column injection and production, meeting the needs of part of the oil and gas wells for steam injection or injection of other media, expanding the application range on the basis of the AICD water control device 500, and facilitating the later operation. When operating the thermal recovery heavy oil well, it effectively prevents the workover fluid from entering the formation during the workover operation, avoids the cold damage and other pollution of the workover fluid to the formation, and has strong applicability and reliable operation when the AICD water control pipe column is used in the heavy oil thermal recovery well or the oil and gas well with injection demand.

[0039] As shown in Figure 3 In an optional embodiment, the first opening and closing assembly 300 includes a sealing rod 301 that can reciprocate in the connector 200, the sealing rod 301 is provided with a through hole 302, and when the sealing rod 301 moves to a position where the through hole 302 corresponds to the flow channel 203, the first opening and closing assembly 300 opens the flow channel 203.

[0040] When the flow channel 203 between the inner side of the connector 200 and the second opening and closing assembly 400 is controlled to be open, the sealing rod 301 is operated to switch between the open and closed states, when the flow channel 203 needs to be open, the sealing rod 301 moves to a position where the through hole 302 corresponds to the flow channel 203, forming a communication state, and when the sealing rod 301 moves to a position where the through hole 302 is misaligned with the flow channel 203, forming a closed state.

[0041] In an optional embodiment, the first opening and closing assembly 300 further comprises a plug 303 fixed on the joint 200 and a first elastic member 304 connected between the sealing rod 301 and the plug 303, and the first elastic member 304 is used to push the sealing rod 301 to move to a position where the through hole 302 is misaligned with the flow channel 203. The first elastic member 304 can be a wave spring or a disc spring, and after assembly, the axial dimension is small, the overall thickness can be kept small, and the overall inner diameter of the screen pipe 600 can be ensured.

[0042] Specifically, the plug 303 is fixed on the joint 200 to form a positioning basis for the sealing rod 301, and the first elastic member 304 is connected between the plug 303 and the sealing rod 301. When the sealing rod 301 moves to a position where the through hole 302 corresponds to the flow channel 203, the first elastic member 304 is compressed, and under the action of the pushing force or the deformation recovery force of the first elastic member 304, the sealing rod 301 has a tendency to move to a misaligned state with the flow channel 203, so as to stably control the relative position of the sealing rod 301 and avoid the intermediate uncontrollable swing state of partial conduction, thereby improving the reliability. A sealing ring can also be arranged on the sealing rod 301 to improve the sealing between the sealing rod 301 and the joint 200.

[0043] In an optional embodiment, a first cavity 305 is arranged between one end of the sealing rod 301 and the joint 200, and a first liquid capable of absorbing heat and expanding is arranged in the first cavity 305, so that after the first liquid absorbs heat and expands, the first liquid pushes the sealing rod 301 to move to a position where the through hole 302 corresponds to the flow channel 203.

[0044] Further, the first liquid is arranged at one end of the sealing rod 301. When the formation needs to be injected with steam, the steam reaches the bottom of the well, and the steam causes the first liquid to absorb heat and expand. When the first liquid receives heat input, the molecules of the first liquid will have higher kinetic energy due to the increase in temperature, which will cause the interaction between the molecules to weaken, thereby reducing the density of the first liquid, i.e., expanding. After the first liquid in the first cavity 305 expands, the first liquid pushes the sealing rod 301 to move until the through hole 302 on the sealing rod 301 corresponds to the flow channel 203, at which time the driving switching of the position of the sealing rod 301 is completed, and the switching of the conduction state is more stable under the working condition of injecting steam.

[0045] When normal well flushing and pump inspection operations are performed, because the temperature of the workover fluid is low, the sealing rod 301 always maintains the through hole 302 of the sealing rod 301 in a misaligned state with the flow channel 203 under the action of the first elastic member 304. At this time, the flow channel 203 remains closed, and the liquid for operation cannot enter the formation through the flow channel 203, thereby avoiding cold damage to the formation and contamination of the workover fluid.

[0046] As Figure 4 shown, in an optional embodiment, the second opening and closing assembly 400 includes a base 401 fixedly connected to the joint 200 and a connecting seat 402, the second opening and closing assembly 400 is provided with a working channel, and the base 401 is provided with a reciprocating sealing head 403, the sealing head 403 is provided with a second elastic member 404 for driving the sealing head 403 to close the working channel, the second elastic member 404 can be provided as a wave spring or a disc spring, after assembly, the axial size is small, the overall thickness can be kept small, and the overall inner diameter of the screen pipe 600 can be kept.

[0047] It should be noted that after the second elastic member 404 is assembled, the second elastic member 404 is deformed to a certain extent, thereby having a certain deformation recovery force to keep the sealing head 403 closed in the working channel in this state, and a reliable sealing basic state is maintained, and the force acting on the sealing head 403 can also be adjusted by adjusting the elastic specification of the second elastic member 404.

[0048] A plurality of second opening and closing assemblies 400 are provided, each second opening and closing assembly 400 is sequentially arranged in the flow channel 203, and the connecting seat 402 in each second opening and closing assembly 400 is fixedly arranged on the joint 200, which can be detachably fixed by threaded connection, and further, high-temperature thread glue can be applied between the connecting seat 402 and the joint 200 during assembly, to further improve the connection stability and the connection sealing performance at this position.

[0049] The base 401 is fixedly arranged on the connecting seat 402 and is provided with a reciprocating sealing head 403, when the sealing head 403 is arranged in the working channel, the flow channel 203 where the working channel is located is also closed, and the sealing head 403 is arranged in the working channel by the second elastic member 404, and the flow pressure of the liquid or gas in the flow channel 203 can push the sealing head 403 in the working channel and compress the second elastic member 404, thereby making the displacement of the sealing head 403 open the working channel and realizing the stable connection state of the working channel to the formation during operation.

[0050] In an optional embodiment, the working channel includes a first perforation 405 arranged on the base 401, an intermediate cavity 406 arranged between the base 401 and the connecting seat 402, and a second perforation 407 arranged on the connecting seat 402, the second elastic member 404 pushes the sealing head 403 to be arranged in the second perforation 407, so that the liquid or gas can push the sealing head 403 to move in the second perforation 407 and sequentially enter the intermediate cavity 406 and the first perforation 405.

[0051] Specifically, when arranging the working channel, a first through hole 405 is formed on the base 401, a second through hole 407 is arranged on the connecting base 402, and the sealing head 403 is arranged in the middle cavity 406 between the base 401 and the connecting base 402. The sealing head 403 and the second elastic member 404 are arranged in the middle cavity 406 to move. The sealing head 403 is separated from the second through hole 407 on the connecting base 402 by the fluid or is pressed on the second through hole 407 by the second elastic member 404. The first through hole 405 arranged on the base 401 can be arranged in multiple to improve the flow efficiency in the flow channel 203.

[0052] In an optional embodiment, the joint 200 is provided with a stepped groove 201, the connecting base 402 is threadedly connected in the stepped groove 201, and the stepped groove 201 and the connecting base 402 are respectively provided with abutting tapered surfaces 202.

[0053] The stepped groove 201 is arranged to improve the length of the connecting surface between the connecting base 402 and the joint 200 after the connecting base 402 is connected, to improve the sealing performance of the connection after assembly through the turning path of the contact surface of the stepped groove 201, and to improve the assembly accuracy through the cooperation of the stepped groove 201. Correspondingly, the tapered surface 202 is further arranged to further improve the assembly accuracy and the sealing performance of the connection.

[0054] In an optional embodiment, the water control device 500 is arranged between the joint 200 and the screen pipe 600 through a water control joint 502, the water control joint 502 is threadedly connected with the joint 200 and the screen pipe 600 respectively to facilitate flexible assembly operation between structures.

[0055] In an optional embodiment, the water control device 500 is provided with a soluble sealing ring 501 near one end in the joint 200. The soluble sealing ring 501 can seal the water control device 500 before dissolving. That is, after the soluble sealing ring 501 is dissolved, the formation fluid enters the inside of the screen pipe 600 through the water control device 500. Because the second opening and closing assembly 400 is in a sealing state under the action of the second elastic member 404, all the liquid can only enter the inside of the screen pipe 600 through the water control device 500, and the water control device 500 plays a flow control role. Because the pressure outside the screen pipe 600 is greater than the pressure inside the screen pipe 600 during production, the pressure difference ensures the stable sealing state of the second opening and closing assembly 400.

[0056] Based on the same inventive concept, the application also provides a pipe string system comprising the above-mentioned injection-production integrated flow control screen pipe. Specifically, in the pipe string system, the structures, connection relationships, installation positions, etc. of other devices can refer to the related disclosures of the prior art, which will not be described here.

[0057] It should be understood that the terms first, second, etc. are used to distinguish descriptions, and cannot be understood as indicating or implying relative importance. Although the terms first, second, etc. can be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another unit. For example, the first unit can be called the second unit, and similarly the second unit can be called the first unit, without departing from the scope of the example embodiments of the present application.

[0058] It should be understood that the term "and / or" herein is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, B exists alone, and A and B exist together. The term "and" herein describes another association relationship of the associated objects, which means that there can be two relationships, for example, A and B can mean that A exists alone, and A and B exist together. In addition, the character " / " herein generally indicates that the associated objects before and after are an "or" relationship.

[0059] It should be understood that in the description of the present application, the orientation or position relationship indicated by the terms "upper", "vertical", "inner", "outer" and the like is the orientation or position relationship when the disclosed product is usually placed, or the orientation or position relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0060] It should be understood that in the description of the present application, unless otherwise explicitly specified and limited, the terms "set", "mount", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0061] The terms used herein are only used to describe specific embodiments and are not intended to limit the example embodiments of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include", "including", "contain", and / or "containing" when used herein specify the existence of the claimed features, integers, steps, operations, units and / or components, and do not exclude the existence or addition of one or more other features, quantities, steps, operations, units, components and / or combinations thereof.

[0062] In the following description, specific details are set forth to provide a thorough understanding of example embodiments. However, one having ordinary skill in the art will understand that the example embodiments can be practiced without these specific details. In other instances, well-known processes, structures and techniques have not been shown to avoid obscuring the subject matter of this description.

[0063] The above summary of the present application is provided to introduce some concepts of the application. A further appreciation of other aspects of the application can be obtained by attending to the following detailed description and appended claims.

[0064] It is to be understood that the information provided in the Background section is merely intended to provide an overview of information available to the public in order to more fully appreciate and understand the context of the present application. Therefore, none of the information contained in the Background section is to be taken as an admission that the information was known before the filing date of the present application.

Claims

1. A flow control screen tube integrating injection and extraction, characterized in that, The flow control screen pipe comprises: an outer pipe, one end of which is used for connecting the screen pipe; a joint fixedly connected in the outer pipe, an inner side of the joint being provided with a sealing sleeve, a water control device being arranged between the joint and the screen pipe, a flow channel being arranged on the joint to communicate the inner side and the outer side of the joint, a first opening and closing component and a plurality of second opening and closing components being arranged on the flow channel; the first opening and closing component is configured to open or close the flow channel between the inner side of the joint and the second opening and closing component, the first opening and closing component comprising a sealing rod reciprocally movable in the joint, a through hole being arranged on the sealing rod, the flow channel being opened when the sealing rod moves to a position corresponding to the through hole, a first cavity being arranged between one end of the sealing rod and the joint, a first liquid capable of absorbing heat and expanding being arranged in the first cavity, the first liquid being used to push the sealing rod to move to the position corresponding to the through hole after absorbing heat and expanding; the second opening and closing component is configured to open or close the flow channel between the first opening and closing component and the outer side of the joint, the second opening and closing component comprising a base fixedly connected to the joint and a connecting seat, a working channel being arranged in the second opening and closing component, a sealing head reciprocally movable being arranged on the base, a second elastic member being arranged on the sealing head to drive the sealing head to close the working channel; when the formation needs to be injected with steam, the steam reaches the bottom of the well, the first opening and closing component drives and opens the flow channel between the inner side of the joint and the second opening and closing component, and pushes the second opening and closing component to open the flow channel between the first opening and closing component and the outer side of the joint, and enters the formation from the screen pipe interlayer under the guidance of the flow channel.

2. The flow control screen of claim 1, wherein: the first opening and closing component further comprises a plug and a first elastic member, the plug being fixedly arranged on the joint, the first elastic member being connected between the sealing rod and the plug, and the first elastic member being used to push the sealing rod to move to a position where the through hole is misaligned with the flow channel.

3. The flow control screen of claim 1, wherein: the working channel comprises a first perforation arranged on the base, an intermediate cavity arranged between the base and the connecting seat, and a second perforation arranged on the connecting seat, the second elastic member pushing the sealing head to be arranged on the second perforation, so that the liquid or gas can push the sealing head to move from the second perforation and sequentially enter the intermediate cavity and the first perforation.

4. The flow control screen of claim 1, wherein: a stepped groove is arranged on the joint, the connecting seat is threadedly connected in the stepped groove, and the stepped groove and the connecting seat are respectively provided with abutting tapered surfaces.

5. The flow control screen of claim 1, wherein: the water control device is arranged between the joint and the screen pipe through a water control joint, the water control joint being threadedly connected with the joint and the screen pipe.

6. The flow control screen of claim 5, wherein: an end of the water control device close to the joint is provided with a soluble sealing ring, the soluble sealing ring being capable of sealing the water control device before being dissolved.

7. A tubular string system characterized by: the flow control screen pipe comprises the injection-production integrated control flow screen pipe as claimed in any one of claims 1-6.

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