Underground separate production and separate injection hydraulic sliding sleeve

Abstract

The utility model relates to the technical field of oil well completion, in particular to an underground separate production and separate injection hydraulic sliding sleeve which comprises an outer sleeve assembly and a mandrel which is arranged in the outer sleeve assembly and connected with the outer sleeve assembly in a sliding mode, the outer sleeve assembly comprises an outer sleeve body, and two hydraulic control pipelines connected with ground hydraulic control equipment are installed on the outer sleeve body. The two hydraulic control pipelines are connected with the outer sleeve main body through a stop component; the stop component comprises stop gaskets which are installed at the corresponding hydraulic control pipeline joints in an anti-rotation mode, and the two stop gaskets are fixedly connected with the outer sleeve body through stop bolts. The hydraulic sliding sleeve has the advantages that the hydraulic sliding sleeve is simple in structure and reasonable in design, the stability of installation and positioning of hydraulic control pipelines and cables is guaranteed, it is guaranteed that the hydraulic sliding sleeve enters a well and is lifted up stably and safely, it is guaranteed that oil well separate production and separate injection are conducted smoothly, and it is guaranteed that oil well production is safer and more reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of well completion technology for oil wells, in particular to a downhole separate production and injection hydraulic sliding sleeve. Background Technique

[0002] Intelligent well completion technology has attracted attention due to its intelligent characteristics. Especially in aspects such as intelligent production adjustment, it can achieve intelligent well completion and scientific production management, enabling the maximum recovery of oil and gas wells. The hydraulic control downhole separate production and injection intelligent sliding sleeve, as the core tool of intelligent well completion technology, plays an important role in the oil and gas production process.

[0003] The sliding sleeve is a key tool in intelligent well completion. The main purpose of the sliding sleeve is to close, open or throttle one or more reservoirs, or to adjust the pressure, fluid flow rate, etc. between reservoirs. At present in China, the main technologies are stratified production and some sliding sleeves that are switched by wire or coiled tubing. During the operation process, the sliding sleeve needs to be lowered into the corresponding production well pit. During the process of lowering or lifting the switched sliding sleeve, the hydraulic control pipeline connected to the sliding sleeve is likely to touch the inner wall of the well pit, which may cause the joints of the hydraulic control pipeline to rotate and become loose, resulting in leakage of the hydraulic control liquid and affecting the normal use of the sliding sleeve. Moreover, during the process of lowering or lifting the switched sliding sleeve, if the cable is not stably positioned on the sliding sleeve, it will rub against the inner wall of the well pit, still posing a safety hazard.

[0004] Patents with publication numbers CN201843582U and CN111927392A both disclose a switched sliding sleeve controlled by hydraulic pressure, and both disclose the opening and closing principle of the switched sliding sleeve, which can realize the controlled opening of the channel between the inside of the hydraulic sliding sleeve and the annular space of the oil well, and realize the closing, opening or throttling of one or more reservoirs of the oil well. However, neither of them discloses the problem that the joints of the hydraulic control pipeline may collide with the inner wall of the well pit during the process of the hydraulic sliding sleeve entering the well, which is likely to cause the joints to become loose, nor gives a technical inspiration to solve the above technical problems. Content of the Utility Model

[0005] In order to solve the above technical problems, the utility model provides a downhole separate production and injection hydraulic sliding sleeve with a simple structure and reasonable design, which can avoid the problem that the joints of the hydraulic control pipeline collide with the inner wall of the well pit and become loose during the process of entering the well, making the production safer and more reliable.

[0006] To achieve the above object, the technical solution adopted by the utility model to solve its technical problems is: the downhole separate production and injection hydraulic sliding sleeve includes an outer sleeve assembly and a mandrel slidably connected thereto inside. The outer sleeve assembly includes an outer sleeve body, and two hydraulic control pipelines connected to the surface hydraulic control equipment are installed on the outer sleeve body. The two hydraulic control pipelines are connected to the outer sleeve body through a stop member;

[0007] The stop member includes a stop gasket which is anti-rotationally installed at the corresponding liquid control pipeline joint, and the two stop gaskets are fixedly connected to the outer sleeve body through a stop bolt.

[0008] The two stop gaskets have the same structure and are installed oppositely; one end of the stop gasket is provided with an anti-rotation hole for anti-rotationally positioning the corresponding liquid control pipeline joint, the anti-rotation hole is matched with the joint of the corresponding liquid control pipeline, and the other end of the stop gasket is provided with a kidney-shaped hole through which the stop bolt passes.

[0009] The outer sleeve body is eccentrically arranged, and a plurality of bypass channels axially arranged along its circumferential direction are provided on the eccentric side of the outer sleeve body for positioning the liquid control pipeline or the armored cable, and a plurality of positioning guard plates I are installed at intervals along the axial direction of the bypass channel.

[0010] One end of the outer sleeve body is connected to the lower joint through a liquid inlet joint, and the other end of the outer sleeve body is connected to the upper joint through a middle joint;

[0011] A plurality of liquid inlet holes I and a plurality of positioning grooves are arranged along the circumferential direction of the middle part of the liquid inlet joint, the liquid inlet holes I and the positioning grooves are arranged alternately, and a plurality of positioning guard plates II are installed on the positioning grooves.

[0012] A hydraulic channel communicated with the corresponding liquid control pipeline is arranged between the outer sleeve body and the core shaft; the outer sleeve body is eccentrically arranged, and a hydraulic channel I and a hydraulic channel II are arranged between the eccentric side of the outer sleeve body and the core shaft, a liquid control pipeline I is installed at the inlet of the hydraulic channel I, and a liquid control pipeline II is installed at the inlet of the hydraulic channel II.

[0013] The hydraulic channel I includes an inlet channel I arranged on the eccentric side of the outer sleeve body, a communication channel I, and an upper chamber arranged between the upper part of the outer sleeve body and the core shaft, and the inlet channel I is connected to the upper chamber through the communication channel I;

[0014] The hydraulic channel II includes an inlet channel II arranged on the eccentric side of the outer sleeve body, a communication channel II, and a lower chamber arranged between the lower part of the outer sleeve body and the core shaft, and the inlet channel II is connected to the lower chamber through the communication channel II.

[0015] An annular flange and a stop retaining ring are arranged along the circumferential direction of the middle part of the core shaft, and a sealing assembly is installed between the annular flange and the stop retaining ring to divide the chamber between the core shaft and the outer sleeve body into a non-communicating upper chamber and a lower chamber.

[0016] An installation groove for installing a plugging device and a positioning stop I for blocking and positioning one end of the mandrel to enable the hydraulic sliding sleeve to be opened in place are provided on the inner wall of the upper joint, and a positioning stop II for blocking and positioning the other end of the mandrel to enable the hydraulic sliding sleeve to be closed in place is provided on the inner wall of the lower joint.

[0017] Positioning holes I and II for positioning with a mechanical switch tool are respectively provided at both ends of the mandrel;

[0018] Guide inclined surfaces are respectively provided at the upper and lower parts of the outer sleeve body.

[0019] Multiple groups of sealing components are arranged at intervals along the axial direction of the mandrel, and the mandrel is in sealed contact connection with the inner wall of the outer sleeve assembly through the sealing components.

[0020] The beneficial effects of the present utility model are:

[0021] The present utility model provides a downhole separate production and injection hydraulic sliding sleeve, which includes an outer sleeve assembly and a mandrel slidably connected thereto inside. Its structure is simple and the design is reasonable. By installing two hydraulic control pipelines on the outer sleeve body, the two hydraulic control pipelines are connected to the outer sleeve body through two stop gaskets and stop bolts, ensuring the stability and versatility of the installation of the two hydraulic control pipelines, effectively avoiding the problem that the joints of the hydraulic control pipelines collide with the inner wall of the well pit and become loose during the process of the hydraulic sliding sleeve entering the well, ensuring the stable and safe entry and lifting of the hydraulic sliding sleeve into the well, ensuring the smooth progress of separate production and injection of the oil well, and ensuring the more safe and reliable exploitation of the oil well. Description of the Drawings

[0022] The following briefly describes the content expressed in each drawing of the specification of the present utility model and the marks in the drawings:

[0023] Figure 1 It is a schematic diagram of the internal structure of the hydraulic sliding sleeve of the present utility model;

[0024] Figure 2 It is a schematic diagram of the structure of the hydraulic control pipeline installed on the outer sleeve body of the present utility model;

[0025] Figure 3 For Figure 2 It is a schematic diagram of the structure of the stop component in;

[0026] Figure 4 It is a schematic diagram of the external structure of the hydraulic sliding sleeve of the present utility model;

[0027] Figure 5 It is a longitudinal sectional view of the liquid inlet joint of the present utility model;

[0028] Figure 6 For Figure 1 It is an enlarged view of part A in;

[0029] Figure 7 is Figure 1 an enlarged view of position B in

[0030] Figure 8 is Figure 1 an enlarged view of position C in

[0031] The markings in the above figures are as follows: 1. upper joint; 1-1. mounting groove; 1-2. positioning stop Ⅰ; 2. middle joint; 3. mandrel; 3-1. liquid inlet hole Ⅱ; 3-2. annular flange; 3-3. stop retaining ring; 3-4. positioning hole Ⅰ; 3-5. positioning hole Ⅱ; 4. outer sleeve body; 4-1. eccentric side; 4-2. bypass channel; 4-3. positioning guard plate Ⅰ; 4-4. inlet channel Ⅰ; 4-5. communication channel Ⅰ; 4-6. inlet channel Ⅱ; 4-7. communication channel Ⅱ; 4-8. guiding inclined surface; 5. liquid inlet joint; 5-1. liquid inlet hole Ⅰ; 5-2. positioning groove; 5-3. positioning guard plate Ⅱ; 6. lower joint; 6-1. positioning stop Ⅱ; 7. liquid control pipeline Ⅰ; 8. liquid control pipeline Ⅱ; 9. sealing assembly; 10. upper chamber; 11. lower chamber; 12. stop component; 12-1. stop gasket Ⅰ; 12-2. stop gasket Ⅱ; 12-3. stop bolt. Detailed implementation manners

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will, with reference to the accompanying drawings in the embodiments of the present utility model, clearly and completely describe the technical solutions in the embodiments. The following embodiments are used to illustrate the present utility model but not to limit the scope of the present utility model.

[0033] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0034] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] In the existing well completion technology, a switching sliding sleeve is usually used to achieve separate production and injection of oil wells. However, during the process of lowering or lifting the switching sliding sleeve, the hydraulic control pipeline connected to the sliding sleeve is likely to touch the inner wall of the wellbore, which may cause the joints of the hydraulic control pipeline to rotate and become loose, resulting in leakage of the hydraulic control liquid and affecting the normal use of the sliding sleeve.

[0036] To address the above technical problems, as Figure 1 and Figure 4 shown, the present utility model provides a downhole separate production and injection hydraulic sliding sleeve, which includes an outer sleeve assembly and a mandrel 3 slidably connected thereto inside. The outer sleeve assembly includes an upper joint 1, a middle joint 2, an outer sleeve body 4, a liquid inlet joint 5, and a lower joint 6 connected in sequence from top to bottom along the axis. The upper end of the outer sleeve body 4 is hermetically and fixedly connected to the upper joint 1 through the middle joint 2, and the lower end of the outer sleeve body 4 is hermetically and fixedly connected to the lower joint 6 through the liquid inlet joint 5. A threaded metal seal is used between the lower end of the upper joint 1 and the middle joint 2. The connection method between the components of the outer sleeve assembly can adopt a threaded metal seal, and the seal is made of a high-strength non-elastic compound, which can effectively solve the problem of sealing and bonding fixation between the seal and the metal parts under harsh working conditions.

[0037] Specifically, a liquid inlet hole Ⅰ5-1 is provided on the liquid inlet joint 5, and a liquid inlet hole Ⅱ3-1 is provided on the mandrel 3. When the mandrel 3 moves upward along the axis of the outer sleeve assembly, if the liquid inlet hole Ⅱ3-1 is opposite and connected to the liquid inlet hole Ⅰ5-1, it indicates that the hydraulic sliding sleeve is in the open state at this time; when the mandrel 3 moves downward along the axis of the outer sleeve assembly, if the liquid inlet hole Ⅱ3-1 and the liquid inlet hole Ⅰ5-1 are gradually misaligned until they are shut off, it indicates that the hydraulic sliding sleeve is in the closed state at this time.

[0038] Specifically, two hydraulic control pipelines connected to the surface hydraulic control equipment are installed on the outer sleeve body 4. The surface hydraulic control equipment is an existing equipment, that is, a control equipment used to pressurize the corresponding hydraulic control pipeline to increase the internal liquid pressure. Its specific structure will not be elaborated here. The two hydraulic control pipelines are connected to the outer sleeve body 4 through a stop member 12. A hydraulic channel communicating with the corresponding hydraulic control pipeline is provided between the outer sleeve body 4 and the mandrel 3. By pressurizing the corresponding hydraulic control pipeline through the surface hydraulic control equipment to increase the liquid pressure in the corresponding hydraulic channel, the mandrel 3 can be pushed up and down to achieve the connection or disconnection of the liquid inlet hole Ⅰ5-1 and the liquid inlet hole Ⅱ3-1, that is, the switching action of the mandrel 3 can be realized, and thus the selective recovery or injection of the oil and gas layer can be realized; the entire control process does not require hoisting the control structure into the corresponding switching sliding sleeve structure through tools such as steel wires, reducing the safety risk of operation, being convenient and fast in operation, and improving the working efficiency of separate production and injection of oil wells.

[0039] Specifically, as Figure 2 andFigure 3 As shown, the outer sleeve body 4 is eccentrically arranged. A hydraulic passage I and a hydraulic passage II are arranged between the eccentric side 4-1 of the outer sleeve body 4 and the mandrel 3. A liquid control pipeline I 7 is installed at the inlet of the hydraulic passage I, and a liquid control pipeline II 8 is installed at the inlet of the hydraulic passage II. The stop member 12 includes a stop gasket I 12-1 installed at the joint of the liquid control pipeline I 7 and a stop gasket II 12-2 installed at the joint of the liquid control pipeline II 8. The stop gasket I 12-1 and the stop gasket II 12-2 are fixedly connected to the outer sleeve body 4 through a stop bolt 12-3, which can prevent the joints of the liquid control pipeline I 7 and the liquid control pipeline II 8 from loosening due to vibration and resulting in joint seal failure. The stop gasket I 12-1 and the stop gasket II 12-2 have the same structure. A positioning step is arranged in the middle of the two stop gaskets. The middle parts of the two stop gaskets are connected by clamping through the positioning step to ensure that the surfaces of the two stop gaskets are horizontal. One end of the stop gasket is provided with an anti-rotation hole for anti-rotation positioning of the corresponding liquid control pipeline joint. The anti-rotation hole is matched with the joint of the liquid control pipeline. The middle parts of the two stop gaskets are connected by clamping through the positioning step, which can ensure that the central axis of the anti-rotation hole is collinear with the central axis of the liquid control pipeline joint, ensuring the stability of the installation of the liquid control pipeline; waist-shaped holes are arranged at the other ends of the two stop gaskets. The stop gasket I 12-1 and the stop gasket II 12-2 are installed oppositely, so that their waist-shaped holes are opposite. The stop bolt 12-3 passes through the opposite waist-shaped holes and is fixed on the outer sleeve body 4, reliably ensuring the stability and anti-vibration performance of the joints of the liquid control pipeline I 7 and the liquid control pipeline II 8.

[0040] Moreover, since the installation distance between the two liquid control pipelines is not required by the national standard, the installation distance between the two liquid control pipelines of each hydraulic sliding sleeve will be different. If only one stop gasket with anti-rotation holes at both ends is used, it cannot meet the general installation of various hydraulic sliding sleeves, and it is necessary to produce stop gaskets of various sizes and specifications, increasing the installation cost; and there may be installation errors during the installation of the liquid control pipeline, and it may be impossible to install the stop gasket or the two liquid control pipelines may be skewed or even leak after the stop gasket is installed. Therefore, the present utility model uses two stop gaskets stacked together and installed on the outer sleeve body 4 through the stop bolt 12-3 passing through the waist-shaped holes, improving the universality of installation, and can also avoid the situation that the two liquid control pipelines cannot be installed or the liquid control pipelines are skewed or even leak due to installation errors during the installation process, ensuring the stability of the installation of the two liquid control pipelines, effectively avoiding the problem that the joints of the liquid control pipelines collide with the inner wall of the well pit and become loose during the process of the hydraulic sliding sleeve entering the well, ensuring the stable and safe entry and lifting of the hydraulic sliding sleeve into the well, ensuring the smooth progress of separate production and separate injection of oil wells, and ensuring the more safe and reliable exploitation of oil wells.

[0041] Specifically, as Figure 4As shown, on the eccentric side 4-1 of the outer sleeve body 4, a plurality of bypass channels 4-2 arranged axially are provided along its circumferential direction. The bypass channels 4-2 are used to locate the hydraulic control pipeline or armored cable. Along the axial direction of the bypass channels 4-2, a plurality of positioning guard plates I 4-3 are installed at intervals, which can stably position and protect the hydraulic control pipeline or armored cable, preventing the hydraulic control pipeline or armored cable from being worn during the process of lowering and lifting the hydraulic sliding sleeve, further ensuring the smooth progress of separate production and injection in the oil well, and ensuring the safer and more reliable oil well production.

[0042] Specifically, as Figure 5 shown, in the middle of the liquid inlet joint 5, a plurality of liquid inlet holes I 5-1 and a plurality of positioning grooves 5-2 are provided along its circumferential direction. The positioning grooves 5-2 are used to locate the hydraulic control pipeline or cable, and a plurality of positioning guard plates II 5-3 are installed on the positioning grooves 5-2, effectively protecting the hydraulic control pipeline or cable from being worn; the liquid inlet holes I 5-1 and the positioning grooves 5-2 are arranged in an alternating manner, ensuring that there is no interference between the hydraulic control pipeline or cable and the liquid inlet holes I 5-1, and preventing erosion of the hydraulic control pipeline or cable during separate production or injection.

[0043] Specifically, as Figure 1 shown, along the axial direction of the mandrel 3, a plurality of sealing assemblies 9 are arranged at intervals and are in sealed contact connection with the inner wall of the outer sleeve assembly through the sealing assemblies 9, ensuring the sealing of the connection. Moreover, a circumferential flange 3-2 is provided in the middle of the mandrel 3 along its circumferential direction, and a stop collar 3-3 is fixed. A sealing assembly 9 is installed between the circumferential flange 3-2 and the stop collar 3-3 to divide the chamber between the mandrel 3 and the outer sleeve body 4 into non-communicating upper chamber 10 and lower chamber 11, which can axially position the sealing assembly 9.

[0044] Specifically, the hydraulic channel I includes an inlet channel I 4-4 provided on the eccentric side 4-1 of the outer sleeve body 4, a communication channel I 4-5, and an upper chamber 10 provided between the upper part of the outer sleeve body 4 and the mandrel 3. The inlet channel I 4-4 is connected to the upper chamber 10 through the communication channel I 4-5. The hydraulic channel II includes an inlet channel II 4-6 provided on the eccentric side 4-1 of the outer sleeve body 4, a communication channel II 4-7, and a lower chamber 11 provided between the lower part of the outer sleeve body 4 and the mandrel 3. The inlet channel II 4-6 is connected to the lower chamber 11 through the communication channel II 4-7.

[0045] When it is necessary to exploit the oil layer where the hydraulic sliding sleeve is located, pressure is applied to the hydraulic control pipeline II 8 through the ground hydraulic control equipment. The opening liquid enters the inlet passage II 4-6 through the hydraulic control pipeline II 8, and enters the lower chamber 11 through the communication passage II 4-7, increasing the liquid pressure in the lower chamber 11. The liquid pressure acts on the sealing assembly 9, and under the action of the annular flange 3-2, the sealing assembly 9 pushes the mandrel 3 in the direction of the upper joint 1 until the mandrel 3 is positioned at the upper joint 1, making the liquid inlet hole I 5-1 communicate with the liquid inlet hole II 3-1, and completely opening the hydraulic sliding sleeve.

[0046] When it is necessary to stop the exploitation of the oil layer where the sliding sleeve is located, pressure is applied to the hydraulic control pipeline I 7 through the ground hydraulic control equipment. The closing liquid enters the inlet passage I 4-4 through the hydraulic control pipeline I 7, and enters the upper chamber 10 through the communication passage I 4-5, increasing the liquid pressure in the upper chamber 10. The liquid pressure acts on the stop retaining ring 3-3, and under the action of the stop retaining ring 3-3, the sealing assembly 9 pushes the mandrel 3 in the direction of the lower joint 6 until the mandrel 3 is positioned at the lower joint 6, making the liquid inlet hole I 5-1 and the liquid inlet hole II 3-1 misaligned and shut off, and completely closing the hydraulic sliding sleeve.

[0047] An installation groove 1-1 for installing a plug is provided on the inner wall of the upper joint 1 (as Figure 6 shown). When the seal inside the sleeve fails or the closing action cannot be achieved, a plug can be placed in the upper joint 1 to shield the current and lower intervals and stop the exploitation of the current and lower intervals. A positioning stop I 1-2 for blocking and positioning one end of the mandrel 3 to make the hydraulic sliding sleeve open in place is also provided on the inner wall of the upper joint 1, and a positioning stop II 6-1 for blocking and positioning the other end of the mandrel 3 to make the hydraulic sliding sleeve close in place is provided on the inner wall of the lower joint 6 (as Figure 8 shown), to limit the opening and closing of the sliding sleeve and prevent opening and closing failures.

[0048] Among them, as Figure 1 、 Figure 7 and Figure 8 shown, positioning holes I 3-4 and II 3-5 for positioning with a mechanical switch tool are respectively provided at the upper and lower ends of the mandrel 3. The mechanical switch tool is a prior art, and its structure is matched with the positioning holes I 3-4 and II 3-5 and can pass through the positioning holes I 3-4 and II 3-5. Its material is a metal material. The mechanical switch tool is a cylindrical structure as a whole, and a switch key is sleeved outside the mandrel 3; the switch key is slidably matched with the mandrel 3, and there is a straight step on the outer surface of the key. In the free state, the outer diameter of the key is larger than the outer diameter of the outer sleeve body 4, and when encountering resistance, it can be retracted to be lower than the outer diameter of the outer sleeve body 4; therefore, the mechanical tool can enter the corresponding positioning hole and cooperate with the positioning hole through the straight step. At this time, by pulling up or vibrating downward, the opening and closing of the sliding sleeve can be achieved.

[0049] When the hydraulic control function of the hydraulic sliding sleeve fails, a mechanical switch tool is lowered for operation. When the downhole sliding sleeve cannot be hydraulically controlled to open, a wire is used to lower the mechanical switch tool and pass through the upper part of the mandrel 3. Then, the mechanical switch tool is fished upward until it is positioned at the positioning hole I 3-4 in the upper part of the mandrel 3. When fishing upward at the positioning hole I 3-4 of the mandrel 3, when the upper part of the mandrel 3 is positioned at the positioning shoulder I 1-2 of the upper sub 1, the sliding sleeve is fully opened. At this time, continuing to fish upward will directly remove the mechanical switch tool, proving that the sliding sleeve has been fully opened. When the sliding sleeve cannot be hydraulically controlled to close, a wire is used to lower the mechanical switch tool and position it at the positioning hole II 3-5 in the lower part of the mandrel 3. When jarring downward at the positioning hole II 3-5 of the mandrel 3, when the lower part of the mandrel 3 is positioned at the positioning shoulder II 6-1 of the lower sub 6, the sliding sleeve is fully closed. At this time, when continuing to jar downward, the mechanical switch tool will pass through the entire mandrel 3, proving that the sliding sleeve is fully closed.

[0050] In addition, as Figure 4 shown, guiding inclined surfaces 4-8 are respectively arranged at the upper and lower parts of the outer sleeve body 4 and at the upper and lower joints 6 of the hydraulic control pipeline, which can protect the hydraulic control pipeline joints and prevent the hydraulic control pipeline joints from being damaged due to collision when the sleeve is lowered or lifted.

[0051] In summary, the structure of the present utility model is simple and reasonably designed, ensuring the stability of the installation and positioning of the hydraulic control pipeline and cable, ensuring the stable and safe lowering and lifting of the hydraulic sliding sleeve, ensuring the smooth progress of separate production and injection in oil wells, and ensuring the safer and more reliable oil well production.

[0052] The above description is only to illustrate some principles of the present utility model with diagrams. This specification is not intended to limit the present utility model to the specific structures and application scopes shown and described. Therefore, all possible corresponding modifications and equivalents that can be utilized belong to the scope of the patent applied for by the present utility model.

Claims

1. A downhole separate production and separate injection hydraulic sliding sleeve, characterized in that: It includes an outer sleeve assembly and a mandrel (3) slidably connected to the inside thereof. The outer sleeve assembly includes an outer sleeve body (4). Two hydraulic control pipelines connected to ground hydraulic control equipment are installed on the outer sleeve body (4), and the two hydraulic control pipelines are connected to the outer sleeve body (4) through a stop member (12). The stop member (12) includes a stop gasket anti-rotationally installed at the corresponding hydraulic control pipeline joint. The two stop gaskets are fixedly connected to the outer sleeve body (4) through a stop bolt (12-3). The two stop gaskets have the same structure and are installed oppositely. A positioning step is provided in the middle of the stop gasket, and the middle parts of the two stop gaskets are connected by clamping through the positioning step. One end of the stop gasket is provided with an anti-rotation hole for anti-rotationally positioning the corresponding hydraulic control pipeline joint. The anti-rotation hole is matched with the joint of the corresponding hydraulic control pipeline. The other end of the stop gasket is provided with a kidney-shaped hole for the stop bolt (12-3) to pass through.

2. The downhole separate production and separate injection hydraulic sliding sleeve according to claim 1, characterized in that: The outer sleeve body (4) is eccentrically arranged. On the eccentric side (4-1) of the outer sleeve body (4), a plurality of bypass channels (4-2) arranged axially along its circumferential direction for positioning hydraulic control pipelines or armored cables are provided. A plurality of positioning guards I (4-3) are installed at intervals along the axial direction of the bypass channels (4-2).

3. The hydraulic sliding sleeve for separate production and injection in the wellbore according to claim 1, characterized in that: One end of the outer sleeve body (4) is connected to a lower joint (6) through a liquid inlet joint (5), and the other end of the outer sleeve body (4) is connected to an upper joint (1) through a middle joint (2). A plurality of liquid inlet holes I (5-1) and a plurality of positioning grooves (5-2) are arranged along the circumferential direction in the middle of the liquid inlet joint (5). The liquid inlet holes I (5-1) and the positioning grooves (5-2) are arranged staggeredly, and a plurality of positioning guards II (5-3) are installed on the positioning grooves (5-2).

4. The downhole separate production and separate injection hydraulic sliding sleeve according to claim 3, characterized in that: A hydraulic channel communicated with the corresponding hydraulic control pipeline is provided between the outer sleeve body (4) and the mandrel (3). The outer sleeve body (4) is eccentrically arranged. A hydraulic channel I and a hydraulic channel II are provided between the eccentric side (4-1) of the outer sleeve body (4) and the mandrel (3). A hydraulic control pipeline I (7) is installed at the inlet of the hydraulic channel I, and a hydraulic control pipeline II (8) is installed at the inlet of the hydraulic channel II.

5. The downhole separate production and separate injection hydraulic sliding sleeve according to claim 4, wherein: The hydraulic channel I includes an inlet channel I (4-4) provided on the eccentric side (4-1) of the outer sleeve body (4), a communication channel I (4-5), and an upper chamber (10) provided between the upper part of the outer sleeve body (4) and the mandrel (3). The inlet channel I (4-4) is connected to the upper chamber (10) through the communication channel I (4-5). The hydraulic channel II includes an inlet channel II (4-6) provided on the eccentric side (4-1) of the outer sleeve body (4), a communication channel II (4-7), and a lower chamber (11) provided between the lower part of the outer sleeve body (4) and the mandrel (3). The inlet channel II (4-6) is connected to the lower chamber (11) through the communication channel II (4-7).

6. The hydraulic sliding sleeve for separate production and injection in the wellbore according to claim 4, wherein: An annular flange (3-2) is circumferentially arranged in the middle of the mandrel (3), and a stop retaining ring (3-3) is fixed. A sealing assembly (9) is installed between the annular flange (3-2) and the stop retaining ring (3-3) to divide the chamber between the mandrel (3) and the outer sleeve body (4) into a non-communicating upper chamber (10) and a lower chamber (11).

7. The hydraulic sliding sleeve for separate production and injection in the wellbore according to claim 3, wherein: An installation groove (1-1) for installing a plug is arranged on the inner wall of the upper joint (1), and a positioning stop port I (1-2) for blocking and positioning one end of the mandrel (3) to enable the hydraulic sliding sleeve to be opened in place is provided. A positioning stop port II (6-1) for blocking and positioning the other end of the mandrel (3) to enable the hydraulic sliding sleeve to be closed in place is arranged on the inner wall of the lower joint (6).

8. The downhole separate production and separate injection hydraulic sliding sleeve according to claim 1, wherein: Positioning holes I (3-4) and II (3-5) for positioning with a mechanical switch tool are respectively arranged at both ends of the mandrel (3); guiding inclined surfaces (4-8) are respectively arranged at the upper and lower parts of the outer sleeve body (4).

9. The downhole separate production and separate injection hydraulic sliding sleeve according to claim 1, characterized in that: A plurality of groups of sealing assemblies (9) are axially spaced along the outer edge of the mandrel (3), and are in sealed contact connection with the inner wall of the outer sleeve assembly through the sealing assemblies (9).

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