Oil well water control production string assembly and use method thereof

Abstract

The present invention discloses an oil well water control production string assembly and a method for using the same, which solves the technical problems of low filling efficiency of oil wells and difficulty in achieving liquid production at the end of production. The device includes a central pipe, multiple bypass isolation packers, and a water control production assembly. Each water control production assembly includes multiple double-layer screen sleeves and multiple water control production short sections. Each water control production short section includes an outer casing, a sealing short section, an AICD valve, and a circulation sleeve. The sealing short section, the AICD valve, and the circulation sleeve are connected in sequence and coaxially located inside the outer casing. An annular flow channel is formed between the sealing short section, the AICD valve, the circulation sleeve, and the outer casing. The sealing short section is used to seal the annular flow channel away from the side of the circulation sleeve. The circulation sleeve is provided with multiple circulation holes, and a control unit for controlling the simultaneous opening and closing of multiple circulation holes is provided inside the circulation sleeve. The present invention can increase the return flow rate of the filling liquid, improve the filling efficiency, and achieve liquid production.

Description

Technical Field

[0001] The invention belongs to the technical field of oil well production and exploitation, and particularly relates to an oil well water control production string assembly and a use method thereof. Background Art

[0002] Offshore oil and gas field development refers to the entire process of bringing underground oil and gas resources to the surface through development wells and offshore engineering facilities using advanced technology based on the understanding and mastery of offshore oil and gas field geology and oil and gas reservoir characteristics. Currently, offshore oil and gas resource development is a hot topic and focus of the world's marine economic development.

[0003] The oil well production string in the related art usually includes a central pipe, to which a double-layer screen sleeve, an AICD valve and multiple bypass isolation packers are connected. Multiple bypass isolation packers are used to fill the open hole in sections to achieve segmented production of the oil well.

[0004] When the oil well production string in the related technology is filled, the filling material enters the annulus between the double-layer screen sleeve and the wellbore through the bypass isolation packer, and the filling liquid enters the central pipe through the flow path of the AICD valve and returns through the top port of the central pipe.

[0005] Due to the AICD valve's small flow path, fluid return is slow during staged packing with gravel or oleophilic and hydrophobic ceramsite, affecting packing efficiency. Furthermore, in the later stages of oil well production, the reservoir's water content increases significantly. Limited by the throttling effect of the AICD valve, it is difficult to increase fluid flow and production, thus affecting the well's later production efficiency and requiring improvement. Summary of the Invention

[0006] In order to solve all or part of the above problems, the purpose of the present invention is to provide an oil well water control production string assembly and its use method, which can increase the return flow rate of the filling liquid, thereby improving the filling efficiency, and at the same time can also achieve liquid lifting and production to ensure the later production and exploitation efficiency of the oil well.

[0007] In a first aspect, the present invention provides an oil well water control production string assembly, comprising a central pipe and a plurality of bypass isolation packers, the central pipe being connected to a plurality of water control production assemblies, the plurality of bypass isolation packers and the plurality of water control production assemblies being arranged at intervals, each of the water control production assemblies comprising a plurality of double-layer screen jackets and a plurality of water control production subs, the plurality of double-layer screen jackets and the plurality of water control production subs being arranged at intervals and interconnected with each other;

[0008] Each of the water control production subs is respectively provided with an outer casing, a setting sub, an AICD valve and a circulation sleeve, both ends of the outer casing are respectively connected to the outer tube of the corresponding double-layer screen jacket, the setting sub, the AICD valve and the circulation sleeve are sequentially connected and coaxially located inside the outer casing, and the setting sub and the circulation sleeve are respectively connected to the inner tube of the corresponding double-layer screen jacket;

[0009] An annular flow channel is formed between the setting nipple, the AICD valve, the circulation sleeve and the outer casing. The setting nipple is used to seal the annular flow channel away from the side of the circulation sleeve. A plurality of circulation holes are provided through the circulation sleeve. The circulation holes connect the annular flow channel with the interior of the circulation sleeve, and a control unit for controlling the simultaneous opening and closing of the plurality of circulation holes is provided in the circulation sleeve.

[0010] Optionally, the control unit includes:

[0011] A control sleeve, slidably connected to the circulating sleeve;

[0012] a limiting member, disposed between the control sleeve and the circulation sleeve;

[0013] The movement of the control sleeve is controlled by an external operating tool. When the control sleeve blocks the multiple circulation holes respectively, or the control sleeve is located on the side of the multiple circulation holes and exposes the multiple circulation holes respectively, the limiting member is used to limit the control sleeve.

[0014] Optionally, the limiting member includes:

[0015] A mounting groove is provided on the control sleeve;

[0016] A limiting clamp ring, which is C-shaped and has an inner edge that is embedded in the mounting groove;

[0017] An opening groove is provided on the inner side wall of the circulating sleeve;

[0018] A closing groove is provided on the inner side wall of the circulating sleeve;

[0019] When the outer edge of the limit clamp forms a snap fit with the opening groove, the multiple circulation holes are exposed respectively. When the outer edge of the limit clamp forms a snap fit with the closing groove, the control sleeve blocks the multiple circulation holes.

[0020] Optionally, the fixed sleeve on the control sleeve is provided with two sets of sealing rings, and the sealing rings are in tight contact with the inner side wall of the circulation sleeve.

[0021] Optionally, when the limiting snap ring forms a snap fit with the closing groove, the plurality of circulation holes are respectively located between two groups of sealing rings.

[0022] Optionally, the limiting snap ring is made of elastic metal, and a guide arc surface is provided on the limiting snap ring. The inner walls on both sides of the opening groove and the closing groove are respectively provided with guide inclined surfaces, so that the limiting snap ring can be smoothly inserted into the opening groove or the closing groove.

[0023] Optionally, the setting sub comprises:

[0024] A rubber base tube, one end of which is connected to the inner tube of the corresponding double-layer screen jacket and the other end of which is connected to the AICD valve;

[0025] The sealing rubber sleeve is sleeved on the rubber sleeve base pipe and is used for sealing between the rubber sleeve base pipe and the outer casing.

[0026] Optionally, the setting rubber cylinder is a self-expanding rubber cylinder, and is fixed to the middle position of the rubber cylinder base pipe by vulcanization, and there is a flow gap between the setting rubber cylinder and the outer casing.

[0027] Optionally, a connecting ring is fixedly provided on the rubber sleeve base tube, and a limiting ring is fixedly connected to the inner side wall of the outer protective tube. The connecting ring is threadedly connected to the limiting ring, and a plurality of flow holes are penetrated through the connecting ring.

[0028] In a second aspect, the present invention provides a method for using an oil well water control production string assembly, comprising the following steps:

[0029] S1, based on the detected oil well reservoir point location, select an appropriate number of double-layer screen sleeves and water control production subs, connect the central pipe, bypass isolation packer and water control production assembly to form the oil well water control production string assembly;

[0030] S2: Run the oil well water control production string assembly to the preset position and set all bypass isolation packers, using multiple bypass isolation packers to separate the wellbore into multiple filling layers;

[0031] S3: Ensure that the circulating sleeve at the lowest position between the filling layers is in the open state, and the other circulating sleeves are in the closed state. During the filling operation, the filling material enters the annulus between the double-layer screen jacket and the wellbore through the bypass packer. The filling liquid enters the circulating sleeve through the multiple circulation holes at the lowest end and is quickly returned through the upper port of the central pipe, thus achieving efficient filling. After the filling operation is completed, the circulating sleeve at the lowest position is closed to resume water control production.

[0032] S4, at the end of oil well production, the circulating sleeve is controlled to open, and the oil reservoir can enter the circulating sleeve through the circulating hole and return through the upper port of the central pipe to achieve oil well liquid extraction and production.

[0033] As can be seen from the above technical solutions, the oil well water control production string assembly and its use method provided by the present invention have the following advantages:

[0034] This device allows the filling liquid to be returned through multiple circulation holes and the flow path of the AICD valve, effectively increasing the return flow rate of the filling liquid and allowing the filling liquid to be quickly returned, thereby improving the filling efficiency of the oil well. At the same time, the circulation hole can also serve as a production channel for the oil reservoir in the late stage of oil well production, allowing the oil reservoir to enter the tubing through the circulation hole, thereby achieving liquid extraction and production in the oil well. Not only that, the device can achieve refined water control production in the oil well. The oil reservoirs at different locations can enter the annular flow channel nearby through the corresponding double-layer screen sleeve, reducing the risk of general mixing of oil reservoirs at different locations, and allowing low-water-content oil reservoirs to quickly enter the tubing through the corresponding AICD valve, thereby improving production efficiency.

[0035] Other features and advantages of the present invention will be set forth in the description that follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation to the technical solution of the present invention.

[0037] Figure 1 This is a schematic diagram of the overall structure of an oil well water control production string assembly according to an embodiment of the present invention;

[0038] Figure 2 This is a structural diagram of a water control production assembly in an embodiment of the present invention;

[0039] Figure 3 is a cross-sectional view of a circulating sleeve in an embodiment of the present invention;

[0040] Figure 4 is a cross-sectional view of a setting sub in an embodiment of the present invention;

[0041] Figure 5 This is a schematic diagram of the use of the oil well water control production string assembly in the filling stage according to an embodiment of the invention;

[0042] Figure 6 This is a schematic diagram of the use of the oil well water control production string assembly in the production stage according to an embodiment of the invention;

[0043] Figure 7 This is a schematic diagram of the use of the oil well water control production string assembly in the liquid extraction stage in an embodiment of the invention.

[0044] Description of reference numerals:

[0045] 1. Central pipe; 2. Bypass isolation packer; 3. Water control production assembly; 31. Double-layer screen sleeve; 32. Water control production sub; 4. Outer casing; 5. Setting sub; 51. Rubber sleeve base pipe; 52. Setting rubber sleeve; 6. AICD valve; 7. Circulation sleeve; 8. Annular flow channel; 9. Circulation hole; 10. Control unit; 101. Control sleeve; 102. Limiting piece; 103. Mounting groove; 104. Limiting snap ring; 105. Opening groove; 106. Closing groove; 11. Sealing ring; 12. Guide arc surface; 13. Guide slope; 14. Connecting ring; 15. Limiting ring; 16. Flow hole. DETAILED DESCRIPTION

[0046] To make the purpose, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other in any manner.

[0047] like Figure 1-Figure 7 The figure shows an embodiment of the present invention, in which an oil well water control production tubing assembly is disclosed, including a central pipe 1, to which are connected a plurality of bypass isolation packers 2 and a plurality of water control production assemblies 3, and the plurality of bypass isolation packers 2 and the plurality of water control production assemblies 3 are arranged at intervals, that is, there is a water control production assembly 3 between each two adjacent bypass isolation packers 2.

[0048] In one embodiment, Figure 1 、 Figure 2 As shown, each water control production assembly 3 includes multiple double-layer screen jackets 31 and multiple water control production subs 32. The multiple double-layer screen jackets 31 and multiple water control production subs 32 are arranged at intervals and interconnected. In this embodiment, only two double-layer screen jackets 31 and two water control production subs 32 are shown.

[0049] In one embodiment, Figure 1 、 Figure 2 As shown, each water control production sub 32 comprises an outer casing 4, a setting sub 5, an AICD valve 6 and a circulation sleeve 7. Both ends of the outer casing 4 are respectively connected to the outer tube of the corresponding double-layer screen jacket 31. The setting sub 5, the AICD valve 6 and the circulation sleeve 7 are threadedly connected in sequence and coaxially located inside the outer casing 4. At the same time, the setting sub 5 and the circulation sleeve 7 are respectively connected to the inner tube of the corresponding double-layer screen jacket 31.

[0050] In one embodiment, Figure 1 、 Figure 2As shown, an annulus flow channel 8 is formed between the setting nipple 5, AICD valve 6, and circulation sleeve 7, and the outer casing 4. The setting nipple 5 is used to block the side of the annulus flow channel 8 away from the circulation sleeve 7. The circulation sleeve 7 is provided with multiple circulation holes 9, which connect the annulus flow channel 8 with the interior of the circulation sleeve 7. At the same time, the circulation sleeve 7 is provided with a control unit 10 for controlling the simultaneous opening and closing of the multiple circulation holes 9.

[0051] During the filling operation, the control unit 10 can control the simultaneous opening of multiple circulation holes 9, allowing the filling liquid to be returned through the multiple circulation holes 9 and the flow path of the AICD valve 6. This effectively increases the return flow rate of the filling liquid, allowing the filling liquid to be returned quickly, thereby improving the filling efficiency of the oil well. At the same time, the circulation holes 9 can also serve as production channels for the oil reservoir in the late production stage of the oil well, allowing the oil reservoir to enter the tubing string through the circulation holes 9 to achieve liquid extraction and production in the oil well.

[0052] In one embodiment, Figure 2 、 Figure 3 As shown, the control unit 10 includes a control sleeve 101 that is slidably connected to the circulation sleeve 7, and the control sleeve 101 can respectively block multiple circulation holes 9. At the same time, a limit member 102 is provided between the control sleeve 101 and the circulation sleeve 7, and the limit member 102 is used to limit the control sleeve 101.

[0053] In one embodiment, Figure 2 、 Figure 3 As shown, the limiting member 102 includes a mounting groove 103 provided on the control sleeve 101. The mounting groove 103 is annular and arranged along the circumference of the control sleeve 101. A C-shaped limiting snap ring 104 is provided in the mounting groove 103. The inner edge of the limiting snap ring 104 is embedded in the mounting groove 103, and the outer edge is exposed outside the mounting groove 103. The inner side wall of the circulating sleeve 7 is provided with an opening groove 105 and a closing groove 106 along its circumference, and the limiting snap ring 104 can form a snap fit with the opening groove 105 or the closing groove 106.

[0054] like Figure 1 As shown, by manipulating the control sleeve 101 to the right using an external operating tool, when the outer edge of the limit collar 104 forms a snap fit with the closing groove 106, the control sleeve 101 blocks the multiple circulation holes 9, thereby closing the circulation sleeve 7. Similarly, by manipulating the control sleeve 101 to the left using an external operating tool, when the outer edge of the limit collar 104 forms a snap fit with the opening groove 105, the control sleeve 101 is positioned to the left of the multiple circulation holes 9, exposing the multiple circulation holes 9, thereby opening the circulation sleeve 7.

[0055] In one embodiment, Figure 2、 Figure 3 As shown, the control sleeve 101 is fixed with two sets of sealing rings 11, each set of sealing rings 11 having two sealing rings. The four sealing rings 11 are in close contact with the inner sidewall of the circulation sleeve 7 to achieve a stable seal between the control sleeve 101 and the circulation sleeve 7. At the same time, when the limiting clamping ring 104 and the closing groove 106 form a snap fit, the four sealing rings 11 are distributed in pairs on both sides of the multiple circulation holes 9 to achieve a seal between the circulation holes 9 and the control sleeve 101, ensuring a good sealing effect.

[0056] In one embodiment, Figure 2 、 Figure 3 As shown, the limiting snap ring 104 is made of elastic metal, and a guide arc surface 12 is integrally formed on the limiting snap ring 104, and the inner walls on both sides of the opening groove 105 and the closing groove 106 are respectively integrally formed with guide inclined surfaces 13 to ensure that the limiting snap ring 104 can be smoothly inserted into the opening groove 105 or the closing groove 106, and at the same time ensure that the limiting snap ring 104 can be smoothly removed from the opening groove 105 or the closing groove 106, thereby realizing rapid control of the opening and closing of the circulating sleeve 7.

[0057] In one embodiment, Figure 2 、 Figure 4 As shown, the setting sub 5 comprises a rubber base tube 51 and a setting rubber tube 52. One end of the rubber base tube 51 is connected to the inner tube of the corresponding double-layer screen jacket 31, and the other end is connected to the AICD valve 6. The setting rubber tube 52 is a self-expanding rubber tube and is fixed to the middle of the rubber base tube 51 by vulcanization. A flow clearance exists between the setting rubber tube 52 and the outer casing 4. After a period of filling, the setting rubber tube 52 automatically expands when exposed to oil, water, oil-water, hydrocarbons, etc., and is set between the rubber base tube 51 and the outer casing 4, thereby automatically sealing the annulus flow channel 8. Since self-expanding rubber tubes are conventional technology, they will not be described in detail here.

[0058] In one embodiment, Figure 2 、 Figure 4 As shown, a connecting ring 14 is integrally formed on the rubber base tube 51, and a limit ring 15 is integrally formed and connected to the inner sidewall of the outer casing 4. The connecting ring 14 and the limit ring 15 are threadedly connected to improve the connection stability between the rubber base tube 51 and the outer casing 4. Furthermore, a plurality of flow holes 16 are provided through the connecting ring 14, and the plurality of flow holes 16 are arranged at equal intervals along the circumference of the connecting ring 14 to ensure smooth flow of liquid within the annular flow channel 8.

[0059] like Figure 5 、 Figure 6 、 Figure 7 As shown, this embodiment also discloses a method for using an oil well water control production string assembly, comprising the following steps:

[0060] S1. According to the detected oil well reservoir point location, select an appropriate number of double-layer screen sleeves 31 and water control production subs 32, connect the central pipe 1, bypass isolation packer 2 and water control production assembly 3 to form an oil well water control production string assembly.

[0061] S2, the oil well water control production string assembly is lowered to a preset position, and all bypass isolation packers 2 are set and sealed, and the wellbore is divided into multiple filling layers using multiple bypass isolation packers 2.

[0062] S3, when lowering the water control production string of the oil well, ensure that the circulation sleeve 7 at the lowest position between the filling layers is in the open state and the other circulation sleeves 7 are in the closed state. When the filling operation is carried out, the filling material enters the annulus between the double-layer screen sleeve 31 and the wellbore through the bypass packer. Subsequently, the filling liquid enters the tubing string through the flow path of the AICD valve 6 and multiple circulation holes 9, and quickly returns through the upper port of the central pipe 1, thereby achieving efficient filling. After a period of time after the filling operation is completed, the sealing rubber sleeve 52 automatically expands and is sealed between the rubber sleeve base pipe 51 and the outer casing 4, thereby achieving automatic blocking of the annulus flow channel 8. Immediately afterwards, the circulation sleeve 7 at the lowest position is closed, and then water control production can be carried out.

[0063] S4, at the end of the oil well production, the circulation sleeve 7 is controlled to open, so that the oil reservoir can enter the circulation sleeve 7 through the circulation hole 9 and return through the upper port of the central pipe 1 to achieve oil well liquid extraction and production.

[0064] As can be seen from the above process, when the oil well is being filled, the filling liquid can be returned through the multiple circulation holes 9 and the flow path of the AICD valve 6, effectively increasing the return flow rate of the filling liquid and allowing the filling liquid to be returned quickly, thereby improving the filling efficiency of the oil well. At the same time, the circulation holes 9 can also serve as production channels for the oil reservoir in the late production stage of the oil well, allowing the oil reservoir to enter the tubing string through the circulation holes 9, thereby achieving liquid extraction and production in the oil well.

[0065] Furthermore, this device can separate the filling layer into multiple small sections. Oil from different reservoirs can enter the annular flow channel 8 through the corresponding double-layer screen jacket 31, and then be controlled by the corresponding AICD valve 6 for water production. This effectively reduces the risk of general mixing of oil from different reservoirs, thereby achieving refined water control production. Compared with the general water control production in existing technologies, this design allows oil in low-water-content reservoirs to quickly pass through the AICD valve 6, effectively improving production efficiency.

[0066] It should be noted that, unless otherwise specified, the technical or scientific terms used in the present invention should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0067] In addition, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the present invention, "plurality" means more than two, unless otherwise specifically defined.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention 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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An oil well water control production string assembly, comprising a central pipe (1) and a plurality of bypass isolation packers (2), characterized in that: The central pipe (1) is connected to a plurality of water control production assemblies (3), the plurality of bypass isolation packers (2) and the plurality of water control production assemblies (3) are arranged at intervals, each of the water control production assemblies (3) comprises a plurality of double-layer screen jackets (31) and a plurality of water control production short sections (32), the plurality of double-layer screen jackets (31) and the plurality of water control production short sections (32) are arranged at intervals and are connected to each other; Each of the water control production nipples (32) comprises an outer casing (4), a setting nipple (5), an AICD valve (6) and a circulation sleeve (7), the two ends of the outer casing (4) are respectively connected to the outer pipe of the corresponding double-layer screen jacket (31), the setting nipple (5), the AICD valve (6) and the circulation sleeve (7) are sequentially connected and coaxially located inside the outer casing (4), and the setting nipple (5) and the circulation sleeve (7) are respectively connected to the inner pipe of the corresponding double-layer screen jacket (31); An annular flow channel (8) is formed between the sealing nipple (5), the AICD valve (6), the circulation sleeve (7) and the outer casing (4). The sealing nipple (5) is used to seal the annular flow channel (8) away from the side of the circulation sleeve (7). A plurality of circulation holes (9) are provided through the circulation sleeve (7). The circulation holes (9) connect the annular flow channel (8) with the interior of the circulation sleeve (7), and a control unit (10) for controlling the simultaneous opening and closing of the plurality of circulation holes (9) is provided in the circulation sleeve (7).

2. The oil well water control production string assembly according to claim 1, characterized in that: The control unit (10) includes: A control sleeve (101) is slidably connected to the circulation sleeve (7); A limiting member (102) is provided between the control sliding sleeve (101) and the circulation sliding sleeve (7); The control sleeve (101) is controlled to move by an external operating tool. When the control sleeve (101) blocks the plurality of circulation holes (9) respectively, or the control sleeve (101) is located on the side of the plurality of circulation holes (9) and exposes the plurality of circulation holes (9) respectively, the limiting member (102) is used to limit the control sleeve (101).

3. The oil well water control production string assembly according to claim 2, characterized in that: The limiting member (102) includes: A mounting groove (103) is provided on the control sleeve (101); A limiting clamping ring (104) is C-shaped, and its inner edge is embedded in the installation groove (103); An opening groove (105) is provided on the inner side wall of the circulating sleeve (7); A closing groove (106) is provided on the inner side wall of the circulating sleeve (7); When the outer edge of the limiting snap ring (104) forms a snap fit with the opening groove (105), the plurality of circulation holes (9) are exposed respectively; when the outer edge of the limiting snap ring (104) forms a snap fit with the closing groove (106), the control sleeve (101) blocks the plurality of circulation holes (9).

4. The oil well water control production string assembly according to claim 3, characterized in that: The fixed sleeve on the control sleeve (101) is provided with two sets of sealing rings (11), and the sealing rings (11) are in close contact with the inner side wall of the circulation sleeve (7).

5. The oil well water control production string assembly according to claim 4, characterized in that: When the limiting snap ring (104) and the closing groove (106) form a snap fit, the plurality of circulation holes (9) are respectively located between the two groups of sealing rings (11).

6. The oil well water control production string assembly according to claim 3, characterized in that: The limiting snap ring (104) is made of elastic metal, and a guide arc surface (12) is provided on the limiting snap ring (104). The inner walls on both sides of the opening groove (105) and the closing groove (106) are respectively provided with guiding inclined surfaces (13), so that the limiting snap ring (104) can be smoothly inserted into the opening groove (105) or the closing groove (106).

7. The oil well water control production string assembly according to claim 1, characterized in that: The setting sub (5) comprises: A rubber base tube (51), one end of which is connected to the inner tube of the corresponding double-layer screen jacket (31) and the other end of which is connected to the AICD valve (6); The sealing rubber sleeve (52) is sleeved on the rubber sleeve base tube (51) and is used for sealing between the rubber sleeve base tube (51) and the outer protective tube (4).

8. The oil well water control production string assembly according to claim 7, characterized in that: The setting rubber cylinder (52) is a self-expanding rubber cylinder and is fixed to the middle position of the rubber cylinder base tube (51) by vulcanization, and a flow gap exists between the setting rubber cylinder (52) and the outer protective tube (4).

9. The oil well water control production string assembly according to claim 7, characterized in that: A connecting ring (14) is fixedly sleeved on the rubber sleeve base tube (51), and a limiting ring (15) is fixedly connected to the inner side wall of the outer protective tube (4). The connecting ring (14) is threadedly connected to the limiting ring (15), and a plurality of flow holes (16) are penetrated through the connecting ring (14).

10. A method for using the oil well water control production string assembly according to any one of claims 1 to 9, characterized in that: The steps include: S1, according to the detected oil well reservoir point location, select an appropriate number of double-layer screen sleeves (31) and water control production short sections (32), connect the central pipe (1), the bypass isolation packer (2) and the water control production assembly (3) to form an oil well water control production string assembly; S2, lowering the oil well water control production string assembly to a preset position, and setting all bypass isolation packers (2), using multiple bypass isolation packers (2) to separate the wellbore into multiple filling layers; S3, ensure that the circulation sleeve (7) at the lowest position between the filling layers is in an open state and the other circulation sleeves (7) are in a closed state. When the filling operation is carried out, the filling material enters the annulus between the double-layer screen sleeve (31) and the wellbore through the bypass isolation packer (2), and the filling liquid enters the circulation sleeve (7) through the multiple circulation holes (9) at the lowest end and quickly returns through the upper port of the central pipe (1), thereby achieving efficient filling. After the filling operation is completed, the circulation sleeve (7) at the lowest position is closed, and water control production can be carried out; S4, at the end of the oil well production, the circulation sleeve (7) is controlled to open, and the oil reservoir can enter the circulation sleeve (7) through the circulation hole (9) and return through the upper port of the central pipe (1) to achieve oil well liquid extraction and production.

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