Production sliding sleeve, production tubular column and production method of offshore oilfield high-temperature gas well

Abstract

The invention discloses a production sliding sleeve, a production tubular column and a production method for a high-temperature gas well of an offshore oilfield. The technical problems that opening and closing control of the production sliding sleeve is tedious, and the adaptability of the production tubular column is poor are solved. The production sliding sleeve comprises a sliding sleeve body of a cylinder structure; the upper joint is arranged at the top of the sliding sleeve main body; the production hole is formed in the sliding sleeve main body; the control cylinder is arranged in the sliding sleeve main body in a sliding manner; the opening hole is formed in the control cylinder; the opening part is used for controlling the sliding sleeve main body to move downwards and enabling the opening hole to be aligned with the production hole; and the closing part is used for controlling the sliding sleeve main body to move upwards and enabling the opening hole and the production hole to be staggered. The structure of the produced sliding sleeve is optimized, rapid and convenient opening and closing control of the produced sliding sleeve is achieved, limitation of well types and well deviation is avoided, the use adaptability is improved, the production method is simpler, and the operation convenience and the operation time efficiency can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and natural gas exploitation, and in particular relates to a production sleeve, a production tubing string and a production method for a high-temperature gas well in an offshore oil field. Background Art

[0002] In the early stages of offshore high-temperature gas well development, formation energy is sufficient, and most offshore high-temperature gas wells utilize self-flowing, layered production strings. However, as development progresses, formation energy gradually decreases, and interlayer conflicts intensify. This seriously threatens the stability of gas well production, leading to a sharp drop in gas production and even flooding and shutdown of the well, significantly reducing the recovery rate of the gas reservoir. Therefore, during the development of offshore high-temperature gas wells, it is necessary to control the gas layer production in each layer and selectively shut down the water-producing layers to extend the effective production cycle of the gas well.

[0003] Currently, the most common offshore control method is to install production sleeves at each production layer and use slickline operations to control the opening and closing of these layers. However, this control method has the disadvantage that slickline operations can only be performed in wells with inclinations less than 65°, making it unsuitable for highly deviated wells and ultra-deep wells in offshore oil and gas fields. Furthermore, offshore platform wellhead space is limited, and slickline operations occupying the wellhead would restrict the implementation of measures in other wells.

[0004] Alternatively, some wells utilize hydraulically controlled sliding sleeves, with a controller installed at the wellhead and connected to the sliding sleeve downhole via hydraulic control lines, secured outside the tubing string by a protective cover. However, this tubing string structure is complex, installation is difficult, and the cost is high. This also increases the likelihood of downhole complications during subsequent tubing string movement operations, requiring improvement. Summary of the Invention

[0005] In order to solve all or part of the above problems, the purpose of the present invention is to provide a production sleeve, production tubing and production method for high-temperature gas wells in offshore oil fields, optimize the structure of the production sleeve, realize fast and convenient opening and closing control of the production sleeve, and is not restricted by well type and well inclination, so as to improve the adaptability of use, make the production method simpler, and improve the convenience of operation and timeliness of operation.

[0006] In a first aspect, the present invention provides a production sleeve for a high-temperature gas well in an offshore oil field, comprising:

[0007] The main body of the sliding sleeve is a vertically arranged cylindrical structure;

[0008] An upper joint, provided on the top of the sleeve body and used for connecting to an external pipe string;

[0009] a production hole, provided on the sleeve body;

[0010] A control cylinder is concentrically slidably disposed in the sliding sleeve body;

[0011] an opening hole, provided on the control cylinder;

[0012] An opening portion, used to control the downward movement of the sleeve body and align the opening hole with the production hole to achieve opening control of the production sleeve;

[0013] The closing portion is used to control the upward movement of the sleeve body and to cause the opening hole to be misaligned with the production hole, so as to achieve closing control of the production sleeve.

[0014] Optionally, the opening portion includes:

[0015] An opening ball can be dropped into the control cylinder from the upper joint;

[0016] An opening slope is provided at the lower end of the inner wall of the control cylinder;

[0017] When the opening ball forms an abutting seal with the opening inclined surface, pressure is applied by an external pressure device, and the control cylinder moves downward under the action of the pressure to align the opening hole with the production hole.

[0018] Optionally, the closing portion includes:

[0019] a return spring disposed in the sliding sleeve body and located below the control cylinder, the return spring being used to push the control cylinder upward so that the opening hole and the production hole are misaligned;

[0020] a support cylinder, concentrically disposed in the control cylinder and located above the control cylinder;

[0021] There are multiple limit claws, each fixed to the bottom of the support tube. The limit claws are made of elastic material and are arranged at equal intervals along the circumference of the support tube. The lower end surfaces of the limit claws can respectively form an abutment limit with the upper end surface of the control tube to limit the upward movement of the control tube.

[0022] The driving member is used to respectively expand the plurality of limiting claws outwards and to respectively separate the lower end surfaces of the plurality of limiting claws from the upper end surface of the control cylinder.

[0023] Optionally, the inner wall of the sleeve body is provided with a step surface, and when the lower end surface of the control cylinder abuts against the step surface, the opening hole is aligned with the production hole, and the lower end surfaces of the plurality of limiting claws respectively form abutment limits with the upper end surface of the control cylinder.

[0024] Optionally, the driving member includes:

[0025] The driving seat is annular in structure and is concentrically slidably disposed in the supporting cylinder;

[0026] A driving inclined surface is provided at the lower end of the outer wall of the driving seat;

[0027] There are multiple guiding inclined surfaces, which are correspondingly arranged on the corresponding limiting claws;

[0028] A pushing member, used for pushing the driving seat to move downward;

[0029] The driving inclined surface is matched with a plurality of the guiding inclined surfaces respectively, so that the limiting claw can be stretched outwards under the joint action of the driving inclined surface and the corresponding guiding inclined surfaces.

[0030] Optionally, the pushing member includes:

[0031] A push ball can be put into the driving seat from the upper joint;

[0032] A push inclined surface is provided at the upper end position of the inner wall of the driving seat;

[0033] When the pushing ball forms an abutting seal with the pushing inclined surface, external pressing equipment is used to press the driving seat downward under the pressure, and the plurality of limiting claws are respectively stretched outward.

[0034] Optionally, the diameter of the pushing ball is larger than the diameter of the opening ball.

[0035] Optionally, the opening ball and the pushing ball are respectively made of materials that can be dissolved in formation fluid.

[0036] In a second aspect, the present invention provides a production string for a high-temperature gas well in an offshore oil field, comprising a plurality of production sleeves and a vertically arranged branch oil production pipe, wherein the branch oil production pipe is provided with a safety valve, a chemical injection valve, a circulation sleeve, and a plurality of packers in order from top to bottom, and a guide wire plug is connected to the bottom of the branch oil production pipe;

[0037] A plurality of production sleeves are respectively connected to the sub-production pipes, and each production sleeve is respectively located between two adjacent packers. A sand control screen is respectively connected between two adjacent packers, and the sub-production pipes are concentrically located in the sand control screen.

[0038] Optionally, the ball diameter of the opening ball of multiple production sleeves, the inner diameter of the control cylinder, the ball diameter of the pushing ball and the inner diameter of the driving seat are reduced from top to bottom respectively, so that each layer of the production sleeve can be individually controlled to open and close by throwing balls and pressing.

[0039] In a third aspect, the present invention provides a production method for a high-temperature gas well in an offshore oil field, comprising the following steps:

[0040] S1: Assemble the production string and run it into the casing, ensuring that the safety valve and all production sleeves are in the open state, and the circulation sleeve is in the closed state;

[0041] S2, controlling multiple packers to be set on the inner wall of the casing to achieve casing stratification;

[0042] S3, multi-layer simultaneous production;

[0043] S4: As production progresses, if a layer produces water, the production sleeve of this layer is closed and production of other layers is resumed;

[0044] S5: After the water production layer is restored, the production sleeve of this layer is opened again, and multiple layers are produced simultaneously.

[0045] Optionally, S4 includes the following steps:

[0046] S41, open the well and release the pressure to the production process or mud pool until the wellhead pressure reaches 0 MPa;

[0047] S42: Insert a push ball corresponding to the production sleeve of the water-producing zone into the wellhead. Wait 1-2 hours until the push ball and the push slope of the production sleeve form a seal. Apply 5 MPa pressure to the wellhead using an external pressure-injection device and maintain the pressure for 10-15 minutes until the production sleeve of the water-producing zone is closed. Then, depressurize the wellhead.

[0048] S43: Shut in the well and record the wellhead pressure every 2 hours for the first 24 hours. After 24 hours, record the pressure every 10 minutes. When the pressure change is less than 1%, reopen the well and resume production.

[0049] S44: If the gas well cannot resume production after completing S41-S43, connect the pipeline from the gas wellhead of the adjacent well to the wellhead of the well, and use the high-pressure gas from the adjacent well to pressurize the liquid in the production string back into the formation. Then observe the change in wellhead pressure. If the pressure change is less than 1% within 10 minutes, open the well to resume production.

[0050] S45: If the gas well still does not resume production after S44 is completed, S44 is repeated until the gas well resumes production.

[0051] As can be seen from the above technical solutions, the production sleeve, production string and production method for high-temperature gas wells in offshore oil fields provided by the present invention have the following advantages:

[0052] The production sleeve can be quickly and conveniently opened and closed, is easy to operate, is not restricted by well type and well inclination, improves adaptability for use, and simplifies the production method, which can improve operational convenience and operation timeliness.

[0053] Other features and advantages of the present invention will be set forth in the description that follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] 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.

[0055] Figure 1 2. It is a cross-sectional view of the production sleeve in Example 1 of the present invention;

[0056] Figure 2 This is a cross-sectional view of the production sleeve in an open state in Example 1 of the present invention;

[0057] Figure 3 2 is a cross-sectional view of the control cylinder in Example 1 of the present invention;

[0058] Figure 4 for Figure 2 A magnified schematic diagram of area A in the middle;

[0059] Figure 5 A cross-sectional view of the production sleeve in a closed state in Example 1 of the present invention;

[0060] Figure 6 for Figure 5 A magnified schematic diagram of area B in the middle;

[0061] Figure 7 2 is a cross-sectional view of the driving seat in Example 1 of the present invention;

[0062] Figure 8 This is a schematic structural diagram of the production string in Example 2 of the present invention;

[0063] Figure 9 Schematic diagram of the production process in Example 2 of the present invention.

[0064] Description of reference numerals:

[0065] 1. Sleeve body; 2. Upper joint; 3. Production hole; 4. Control cylinder; 5. Opening hole; 6. Opening part; 61. Opening ball; 62. Opening slope; 7. Closing part; 8. Return spring; 9. Support cylinder; 10. Limit claw; 11. Driving member; 111. Driving seat; 112. Driving slope; 113. Guide slope; 12. Step surface; 13. Pushing member; 131. Pushing ball; 132. Pushing slope; 14. Production pipe; 15. Safety valve; 16. Chemical injection valve; 17. Circulating sleeve; 18. Packer; 19. Guide wire plug; 20. Sand control screen;

[0066] 100. Production of sliding sleeves; 200. Production of tubing strings. DETAILED DESCRIPTION

[0067] 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.

[0068] Example 1

[0069] like Figure 1-Figure 7 The embodiment 1 of the present invention is shown, which discloses a production sleeve 100 for a high-temperature gas well in an offshore oil field, including a vertically arranged sleeve body 1, the sleeve body 1 having a cylindrical structure, and an upper joint 2 being threadedly connected to the top of the sleeve body 1, and the upper joint 2 is used to connect to an external pipe string.

[0070] In one embodiment, Figure 1 As shown, the sleeve body 1 is provided with multiple production holes 3, and the multiple production holes 3 are arranged at equal intervals along the circumference of the sleeve body 1. A control cylinder 4 is concentrically slidably disposed within the sleeve body 1, and the control hole is provided with multiple openings 5, and the multiple openings 5 ​​are arranged in a one-to-one correspondence with the multiple production holes 3.

[0071] In one embodiment, Figure 1 As shown, the production sleeve 100 further includes an opening portion 6 and a closing portion 7. The opening portion 6 is used to control the downward movement of the sleeve body 1 and align the opening hole 5 with the production hole 3 to achieve opening control of the production sleeve 100. The closing portion 7 is used to control the upward movement of the sleeve body 1 and misalign the opening hole 5 with the production hole 3 to achieve closing control of the production sleeve 100.

[0072] In one embodiment, Figure 2 、 Figure 3 As shown, the opening portion 6 includes an opening ball 61 and an opening slope 62. The opening ball 61 can be dropped from the upper joint 2 into the control cylinder 4. The opening slope 62 is conical and located at the lower end of the inner wall of the control cylinder 4. When the opening ball 61 is dropped into the control cylinder 4 and forms an abutment seal with the opening slope 62, pressure is applied by external pressure equipment, causing the control cylinder 4 to move downward under the pressure, aligning the opening hole 5 with the production hole 3, thereby achieving controlled opening of the production sleeve 100.

[0073] In one embodiment, Figure 1 、 Figure 2 As shown, the closing portion 7 includes a return spring 8 arranged in the sleeve body 1. The return spring 8 is located below the control cylinder 4 and abuts against the control cylinder 4. At the same time, the return spring 8 is used to push the control cylinder 4 to move upward so that the opening hole 5 and the production hole 3 are misaligned.

[0074] In one embodiment, Figure 2 、 Figure 4 As shown, a support cylinder 9 located above the control cylinder 4 is concentrically fixedly connected inside the control cylinder 4, and a plurality of elastic limiting claws 10 are fixedly connected to the bottom of the support cylinder 9. The plurality of limiting claws 10 are arranged at equal intervals along the circumference of the support cylinder 9, and the lower end faces of the plurality of limiting claws 10 can respectively form abutment limits with the upper end face of the control cylinder 4 to limit the upward movement of the control cylinder 4.

[0075] In one embodiment, Figure 1 、 Figure 5 As shown, the closing portion 7 also includes a driving member 11, which is used to cause the multiple limiting claws 10 to be stretched outward respectively, and the lower end faces of the multiple limiting claws 10 to be separated from the upper end faces of the control cylinder 4 respectively, so that the control cylinder 4 can move upward under the elastic force of the reset spring 8, and cause the opening hole 5 to be misaligned with the production hole 3, so as to realize the closing control of the production sleeve 100.

[0076] In one embodiment, Figure 2 、 Figure 5 As shown, the inner wall of the sleeve body 1 is provided with a step surface 12. When the control cylinder 4 moves downward and the lower end surface of the control cylinder 4 abuts against the step surface 12, the multiple opening holes 5 are respectively aligned with the corresponding production holes 3, and the lower end surfaces of the multiple limiting claws 10 just form abutment limits with the upper end surface of the control cylinder 4, thereby realizing the limitation of the sliding stroke of the control cylinder 4.

[0077] In one embodiment, Figure 4 、 Figure 6 As shown, the driving member 11 includes a driving seat 111 that is concentrically slidably arranged in the support tube 9. The driving seat 111 is an annular structure. A conical driving inclined surface 112 is provided at the lower end position of the outer wall of the driving seat 111. A guide inclined surface 113 is respectively provided on each limiting claw 10, and the driving inclined surface 112 is matched with multiple guide inclined surfaces 113 respectively.

[0078] In one embodiment, Figure 5 、 Figure 7 As shown, the driving member 11 also includes a pushing member 13, which is used to push the driving seat 111 to move downward, so that the multiple limiting claws 10 are stretched outward under the joint action of the driving inclined surface 112 and the corresponding guiding inclined surface 113, and the lower end surfaces of the multiple limiting claws 10 are separated from the upper end surface of the control cylinder 4 respectively.

[0079] In one embodiment, Figure 5 、 Figure 7As shown, the pushing member 13 includes a pushing ball 131 and an annular pushing inclined surface 132. The pushing ball 131 can be dropped from the upper joint 2 into the driving seat 111. The pushing inclined surface 132 is provided at the upper end of the inner wall of the driving seat 111. When the pushing ball 131 is dropped into the driving seat 111 and abuts and seals with the pushing inclined surface 132, external pressure equipment applies pressure, causing the driving seat 111 to move downward under the pressure, thereby causing the plurality of limiting claws 10 to be respectively opened outward.

[0080] In one embodiment, Figure 2 、 Figure 5 As shown, the diameter of the push ball 131 is larger than that of the opening ball 61. The opening ball 61 and the push ball 131 are each made of a material that is soluble in the formation fluid. In this embodiment, the opening ball 61 and the push ball 131 are each made of a magnesium-aluminum alloy with zinc and copper additives to improve the overall strength. At the same time, the density of the opening ball 61 and the push ball 131 is 2.3g / cm 3 , can rely on gravity to drop the ball into place, temperature resistance of 180 ℃, suitable for high temperature formations in offshore oil fields, pressure resistance of 10MPa.

[0081] The opening control operation of the production sleeve 100 in this embodiment is as follows:

[0082] The opening ball 61 is inserted until it forms a seal with the opening bevel 62. External pressure is then applied, allowing the control cylinder 4 to move downward under the pressure, compressing the return spring 8. When the control cylinder 4 contacts the stepped surface 12, the multiple opening holes 5 align with the multiple production holes 3, and the control cylinder 4 moves just below the multiple limit claws 10. The multiple limit claws 10 return to their original position under their own elastic force, and the lower end surfaces of the multiple limit claws 10 contact the upper end surface of the control cylinder 4, limiting the upward movement of the control cylinder 4 and ensuring stable opening of the production sleeve 100.

[0083] The closing control operation of the production sleeve 100 in this embodiment is as follows:

[0084] The push ball 131 is inserted until it forms a seal with the push slope 132. External pressure is then applied, causing the drive seat 111 to move downward under the pressure. The multiple limit claws 10 are then pushed outward by the combined action of the drive slope 112 and the corresponding guide slopes 113. After the multiple limit claws 10 are separated from the control cylinder 4, the control cylinder 4 moves upward under the elastic force of the return spring 8, causing the opening hole 5 to shift with the production hole 3, thereby closing the production sleeve 100.

[0085] The production sleeve 100 in this embodiment can realize the opening and closing control of the switch sleeve by throwing a ball and pressing, which is simpler and more convenient to operate, is not restricted by the well type and well inclination, improves the adaptability of use, and can also reduce the construction difficulty and construction cost.

[0086] Example 2

[0087] like Figure 8 The embodiment 2 of the present invention is shown, which discloses a production tubing string 200 for a high-temperature gas well in an offshore oil field, including multiple production sleeves 100 in embodiment 1. The production tubing string 200 also includes a vertically arranged branch oil production pipe 14, on which a safety valve 15, a chemical injection valve 16, a circulation sleeve 17 and multiple packers 18 are arranged in sequence from top to bottom. At the same time, a guide wire plug 19 is connected to the bottom of the branch oil production pipe 14.

[0088] In one embodiment, Figure 8 As shown, multiple production sleeves 100 are connected to the sub-production pipes 14, and each production sleeve 100 is located between two adjacent packers 18. At the same time, a sand control screen 20 is connected between two adjacent packers 18, and the sub-production pipes 14 are concentrically located within the sand control screen 20.

[0089] In one embodiment, Figure 8 As shown, the ball diameters of the opening balls 61 of multiple production sleeves 100, the inner diameters of the control cylinders 4, the ball diameters of the push balls 131, and the inner diameters of the drive seats 111 decrease successively from top to bottom, that is, each layer of production sleeves 100 corresponds to a set of opening balls 61 and push balls 131 of different sizes, so that each layer of production sleeves 100 can be individually controlled to open and close by throwing balls and pressing.

[0090] In this embodiment, the pushing ball 131 and the opening ball 61 gradually dissolve after being immersed in the formation fluid for a certain period of time, and their sizes gradually become smaller, and then settle to the position of the guide wire plug 19, and then completely dissolve under the action of further immersion in the formation fluid in the oil pipe.

[0091] The production string 200 in this embodiment has a simpler structure, can realize independent production or simultaneous production of multiple layers, and can also improve durability and safety.

[0092] Example 3

[0093] like Figure 9 The third embodiment of the present invention is shown. This embodiment discloses a production method for a high-temperature gas well in an offshore oil field. The production string 200 in the second embodiment is used. The production method includes the following steps:

[0094] S1, assemble the production string 200 and run it into the casing, ensuring that the safety valve 15 and all production sleeves 100 are in the open state, and the circulation sleeve 17 is in the closed state;

[0095] S2, controlling the plurality of packers 18 to be respectively set on the inner wall of the casing to achieve stratification of the casing;

[0096] S3, since the multiple production slides 100 are in the open state, multiple layers can be produced simultaneously;

[0097] S4: As production progresses, if a certain layer produces water, the gas production at the wellhead will decrease. As time goes by, the gas-liquid carrying capacity will decrease until production stops. At this time, the production sleeve 100 of this layer is closed, and production of other layers is resumed.

[0098] S5, after the water production layer is restored, the production sleeve 100 of this layer is opened again, and multiple layers are produced simultaneously.

[0099] S4 includes the following steps:

[0100] S41, open the well and release the pressure to the production process or mud pool until the wellhead pressure reaches 0 MPa;

[0101] S42: Insert the push ball 131 corresponding to the production sleeve 100 at the water-producing zone into the wellhead. Wait for 1-2 hours until the push ball 131 forms a seal with the push slope 132 of the production sleeve 100. Apply 5 MPa pressure to the wellhead using external pressure equipment and maintain the pressure for 10-15 minutes until the production sleeve 100 at the water-producing zone is closed (refer to Example 1 for the closing operation). Then, depressurize the wellhead.

[0102] S43: Shut in the well and record the wellhead pressure every 2 hours for the first 24 hours. After 24 hours, record the pressure every 10 minutes. When the pressure change is less than 1%, reopen the well and resume production.

[0103] S44: If the gas well cannot resume production after completing S41-S43, connect the adjacent wellhead to the wellhead of the gas well through a pipeline, and introduce high-pressure gas from the adjacent well into the wellhead. Use the high-pressure gas to pressurize the liquid in the production string 200 back into the formation. Then observe the change in wellhead pressure. If the pressure change is less than 1% within 10 minutes, open the well and resume production.

[0104] S45: If the gas well still does not resume production after S44 is completed, S44 is repeated until the gas well resumes production.

[0105] In S42, the closing operation of the production sleeve 100 at the water-producing layer may refer to Example 1, and will not be described in detail here.

[0106] The steps in S5 to determine whether the water-producing layer has recovered are similar to those in S4. Specifically, the production sleeve 100 in the water-producing layer is opened (refer to Example 1 for the opening operation), and the production sleeves 100 in the remaining layers are closed. Steps S41-S43 are repeated. If the pressure change is less than 1%, the production sleeves 100 in the remaining layers are opened, and production resumes at the well. Of course, if the gas well cannot resume production after repeating S41-S43, S44 and S45 are performed until the gas well reaches production conditions. At this point, the production sleeves 100 in the remaining layers are opened, allowing simultaneous production to continue at multiple layers.

[0107] In summary, this application has the following advantages:

[0108] (1) It does not occupy the operating wellhead, ensuring time and space for other operations on the offshore platform;

[0109] (2) The construction process is simple, which reduces the operation risk, has low overall cost, and significantly reduces costs and increases efficiency;

[0110] (3) Not limited by well inclination, applicable to vertical wells, inclined wells, and horizontal wells;

[0111] (4) The opening and closing of the layer are achieved by dissolvable balls, which can withstand temperatures of 180°C. After the balls dissolve in the produced water, the gas layer production is unrestricted;

[0112] (5) It can be used in conjunction with existing mature tools and can be expanded to water injection wells and oil production wells.

[0113] 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.

[0114] 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.

[0115] 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. A production sleeve for a high-temperature gas well in an offshore oil field, characterized in that: include: The sliding sleeve body (1) is a vertically arranged cylindrical structure; An upper joint (2) is provided on the top of the sleeve body (1) and is used for connecting to an external pipe string; A production hole (3) is provided on the sleeve body (1); A control cylinder (4) is concentrically slidably disposed in the sleeve body (1); An opening hole (5) is provided on the control cylinder (4); An opening portion (6) is used to control the downward movement of the sleeve body (1) and align the opening hole (5) with the production hole (3) to achieve opening control of the production sleeve (100); The closing portion (7) is used to control the upward movement of the sleeve body (1) and to dislocate the opening hole (5) and the production hole (3) to achieve closing control of the production sleeve (100).

2. The production sleeve according to claim 1, characterized in that: The opening portion (6) comprises: An opening ball (61) can be dropped from the upper joint (2) into the control cylinder (4); An opening inclined surface (62) is provided at the lower end of the inner wall of the control cylinder (4); When the opening ball (61) and the opening inclined surface (62) form an abutting seal, external pressing equipment is used to pressurize the control cylinder (4), and the control cylinder (4) moves downward under the pressure to align the opening hole (5) with the production hole (3).

3. The production sleeve according to claim 2, characterized in that: The closing portion (7) comprises: a return spring (8) disposed in the sleeve body (1) and located below the control cylinder (4), the return spring (8) being used to push the control cylinder (4) upward so as to dislocate the opening hole (5) and the production hole (3); A support cylinder (9) is concentrically arranged in the control cylinder (4) and located above the control cylinder (4); There are a plurality of limiting claws (10) which are respectively fixed to the bottom of the support tube (9); the plurality of limiting claws (10) are respectively made of elastic material and are arranged at equal intervals along the circumference of the support tube (9); the lower end surfaces of the plurality of limiting claws (10) can respectively form an abutment limit with the upper end surface of the control tube (4) to limit the upward movement of the control tube (4); The driving member (11) is used to respectively open the plurality of limiting claws (10) outwards and to respectively separate the lower end surfaces of the plurality of limiting claws (10) from the upper end surface of the control cylinder (4).

4. The production sleeve according to claim 3, characterized in that: The inner wall of the sleeve body (1) is provided with a stepped surface (12). When the lower end surface of the control cylinder (4) abuts against the stepped surface (12), the opening hole (5) is aligned with the production hole (3), and the lower end surfaces of the plurality of limiting claws (10) respectively form abutment and limiting contact with the upper end surface of the control cylinder (4).

5. The production sleeve according to claim 3, characterized in that: The driving member (11) comprises: The driving seat (111) is annular in structure and is concentrically slidably disposed in the supporting cylinder (9); A driving inclined surface (112) is provided at the lower end of the outer wall of the driving seat (111); There are multiple guiding inclined surfaces (113), which are correspondingly arranged on the corresponding limiting claws (10); A pushing member (13) for pushing the driving seat (111) downward; The driving inclined surface (112) is matched with a plurality of the guiding inclined surfaces (113) respectively, so that the limiting claw (10) can be stretched outward under the joint action of the driving inclined surface (112) and the corresponding guiding inclined surfaces (113).

6. The production sleeve according to claim 5, characterized in that: The pushing member (13) comprises: A push ball (131) can be put into the driving seat (111) from the upper joint (2); A push inclined surface (132) is provided at the upper end of the inner wall of the driving seat (111); When the pushing ball (131) and the pushing inclined surface (132) form an abutting seal, they are pressed by an external pressing device, and the driving seat (111) moves downward under the pressure, causing the plurality of limiting claws (10) to be respectively spread outward.

7. The production sleeve according to claim 6, characterized in that: The ball diameter of the pushing ball (131) is larger than the ball diameter of the opening ball (61).

8. The production sleeve according to claim 6, characterized in that: The opening ball (61) and the pushing ball (131) are respectively made of materials that can be dissolved in formation fluid.

9. A production string for a high-temperature gas well in an offshore oil field, comprising a plurality of production sleeves (100) according to any one of claims 1 to 8, characterized in that: The invention also comprises a vertically arranged branch oil production pipe (14), on which a safety valve (15), a chemical injection valve (16), a circulation sleeve (17) and a plurality of packers (18) are sequentially arranged from top to bottom, and a guide wire plug (19) is connected to the bottom of the branch oil production pipe (14); A plurality of production sleeves (100) are respectively connected to the sub-production pipes (14), and each of the production sleeves (100) is respectively located between two adjacent packers (18), a sand control screen (20) is respectively connected between two adjacent packers (18), and the sub-production pipes (14) are concentrically located in the sand control screen (20).

10. The production string according to claim 9, characterized in that The ball diameters of the opening balls (61) of the multiple production sleeves (100), the inner diameter of the control cylinder (4), the ball diameter of the push ball (131) and the inner diameter of the drive seat (111) are reduced in sequence from top to bottom, so that each layer of the production sleeve (100) can be individually opened and closed by ball injection and pressure.

11. A production method for a high-temperature gas well in an offshore oil field, using the production string according to claim 9, characterized in that: The steps include: S1, assemble the production string (200) and run it into the casing, ensuring that the safety valve (15) and all production sleeves (100) are in the open state, and the circulation sleeve (17) is in the closed state; S2, controlling a plurality of packers (18) to be respectively set on the inner wall of the casing to achieve stratification of the casing; S3, multi-layer simultaneous production; S4, as production progresses, if a layer produces water, the production sleeve (100) of this layer is closed, and production of other layers is resumed; S5, after the water production layer is restored, the production sleeve (100) of this layer is opened again, and multiple layers are produced simultaneously.

12. The production method according to claim 11, characterized in that S4 includes the following steps: S41, open the well and release the pressure to the production process or mud pool until the wellhead pressure reaches 0 MPa; S42, inserting a push ball (131) corresponding to the production sleeve (100) of the water-producing layer into the wellhead, waiting for 1-2 hours until the push ball (131) and the push inclined surface (132) of the production sleeve (100) form an abutment seal, applying 5 MPa pressure to the wellhead through an external pressure device, and stabilizing the pressure for 10-15 minutes until the production sleeve (100) of the water-producing layer is closed, and then depressurizing the wellhead; S43: Shut in the well and record the wellhead pressure every 2 hours for the first 24 hours. After 24 hours, record the pressure every 10 minutes. When the pressure change is less than 1%, reopen the well and resume production. S44: If the gas well cannot resume production after completing S41-S43, connect the pipeline from the gas wellhead of the adjacent well to the wellhead of the well, and use the high-pressure gas from the adjacent well to pressurize the liquid in the production string back into the formation. Then observe the change in wellhead pressure. If the pressure change is less than 1% within 10 minutes, open the well to resume production. S45: If the gas production well has not resumed production after completing S44, S44 is repeated until the gas production well resumes production.

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