Setting device

Abstract

The setting device sequentially comprises an upper joint, a connector, an upper central pipe, a lower central pipe, a lower joint, a ball catcher and a guide end cover from top to bottom, according to the device, through organic combination of multiple innovative technologies such as a multi-sealing structure design, a distributed pressure transmission design, a double-blocking guarantee mechanism, an adjustable shearing releasing mechanism and a modular detachable structure design, the reliability and safety of the setting device in a complex underground environment are comprehensively improved; no matter in conventional oil and gas exploitation or under extremely complex special working conditions such as high temperature, high pressure and high corrosion, the device can operate stably, and a safe, efficient and economical comprehensive solution is provided for the fields of oil and gas field exploitation, underground engineering and the like with high adaptability and reusability, the working efficiency is remarkably improved, and the service life of equipment is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of packer setting, in particular to a setting device. BACKGROUND

[0002] With the promotion of China's green and low-carbon development strategy, large-diameter casings are widely used in gas storage projects, and higher requirements are put forward for matching packer setting devices. The existing packer setting tools have been unable to meet the special working conditions of large-diameter gas storage. For example, the common shear ball seat type setting scheme needs to multiply the number of shear pins due to large size, and the cumulative deviation of shear force is enlarged, which leads to a rapid decline in setting pressure control accuracy. In addition, the increase in the pressure area of the large-diameter ball seat makes the pipe string tension exceed the conventional oil pipe safety bearing limit, which poses a deformation risk and leads to low safety and reliability. The steel wire plugging type scheme lacks suitable plugs and permanent connection design, so the setting pressure is directly transmitted to the pipe string, which easily causes oil pipe deformation and aggravates the risk of pipe string failure, thereby leading to poor safety and reliability. The small-diameter hydraulic setting scheme has poor adaptability and low safety due to problems such as transmission hole layout, single-stage sealing, and lack of pressure regulating mechanism. In addition, these setting devices also have the problems of easy breakage of sealing elements, unreasonable transmission hole layout, poor cross-sectional tensile strength and easy plugging, and single ball catching sealing surface leading to operation failure, which causes the setting device to be unable to be reused and has great safety hazards. SUMMARY

[0003] In order to solve the above-mentioned problems, the present application provides a safe, reliable and reusable setting device, which comprises: an upper joint composed of a rod portion, a first tapered portion and a first cylindrical portion in sequence, a stop step is arranged at the connection between the first tapered portion and the first cylindrical portion, a first long sealing surface is arranged on the side wall of the first cylindrical portion, and at least three groups of molded sealing elements are arranged on the first long sealing surface, and a first inner cavity in communication with the external environment is arranged in the interior of the upper joint; a connector detachably connected with the upper joint and abutting against the molded sealing elements; an upper central tube detachably connected with the connector and internally provided with a second inner cavity in communication with the first inner cavity, and at most two transmission holes are arranged on the upper central tube at not less than two height positions in the axial direction; a lower central tube detachably connected with the upper central tube and internally provided with a third inner cavity in communication with the second inner cavity, and at most two transmission holes are arranged on the lower central tube at not less than two height positions in the axial direction; The lower joint is detachably connected with the lower central pipe and is sequentially composed of a second cylindrical part, a second tapered part and a neck part. A second long sealing surface is arranged on the side wall of the second cylindrical part. At least three groups of molded sealing elements are arranged on the second long sealing surface. A limiting part is detachably connected with the second tapered part and abuts against the molded sealing elements. A shearing screw hole is arranged on the neck part. A fourth inner cavity which is in communication with the third inner cavity is further arranged inside the lower joint. The fourth inner cavity includes a first cylindrical cavity and a second cylindrical cavity. The diameter of the first cylindrical cavity is greater than the diameter of the second cylindrical cavity. The first cylindrical cavity and the second cylindrical cavity are connected through a first ball catching sealing surface. A ball catcher is arranged in the second cylindrical cavity of the lower joint. A fifth inner cavity which is in communication with the fourth inner cavity is arranged inside the ball catcher. The fifth inner cavity includes a second ball catching sealing surface in the shape of a neck and a third cylindrical cavity. The diameter of the third cylindrical cavity is equal to the minimum diameter of the second ball catching sealing surface in the shape of a neck. A blind hole or an arc-shaped insertion slot is arranged on the side wall of the ball catcher. The blind hole or the arc-shaped insertion slot corresponds to the position of the shearing screw hole. The ball catcher is fastened with the lower joint by penetrating the shearing screw hole and the blind hole with a fastener or by penetrating the shearing screw hole and the arc-shaped insertion slot with a fastener. A guide end cover is detachably connected with the lower joint. The guide end cover is provided with a sixth inner cavity which is in communication with the fifth inner cavity and an external space. The diameter of the sixth inner cavity is greater than or equal to the outer diameter of the ball catcher. A neck-shaped stop surface is arranged at the end of the sixth inner cavity which is away from the ball catcher. The diameter of the second sealing ball is greater than the minimum diameter of the neck-shaped stop surface.

[0004] Preferably, the three molded sealing elements of the first long sealing surface are a first molded sealing element, a second molded sealing element and a third molded sealing element. The three molded sealing elements of the second long sealing surface are a fourth molded sealing element, a fifth molded sealing element and a sixth molded sealing element. Each molded sealing element has the same structure and includes a molded sealing frame, a first sealing element and a second sealing element. The molded sealing frame is in the shape of an inverted T and is arranged on the first long sealing surface or the second long sealing surface. The first sealing element and the second sealing element are respectively arranged on the two sides of the molded sealing frame. A first annular sealing groove is arranged on the side of the molded sealing frame which is in contact with the first long sealing surface or the second long sealing surface. A first sealing ring is arranged in the first annular sealing groove.

[0005] Preferably, the molded sealing frame is made of a metal material.

[0006] Preferably, the first sealing element and the second sealing element are both made of an elastic material.

[0007] Preferably, the connector is threadedly connected with the first cylindrical part and the upper central pipe at the two ends respectively.

[0008] Preferably, the upper central pipe is provided with a first pressure transmission hole and a second pressure transmission hole at two different height positions along the axial direction respectively. The lower central pipe is provided with a third pressure transmission hole and a fourth pressure transmission hole at two different height positions along the axial direction respectively. The first pressure transmission hole, the second pressure transmission hole, the third pressure transmission hole and the fourth pressure transmission hole are all two.

[0009] Preferably, the number of shearing screw holes is set to 2-3 times the number of shearing screw holes actually required to meet the expected releasing pressure.

[0010] Preferably, a short sealing surface is arranged outside the ball catcher, a second annular sealing groove is arranged on the side of the second cylindrical cavity in contact with the short sealing surface, and a second sealing ring is arranged in the second annular sealing groove.

[0011] Preferably, an adjusting groove is arranged on the bottom wall of the ball catcher.

[0012] Preferably, flush holes are arranged on the side wall of the guide end cover and penetrate the sixth inner cavity, and at least four flush holes are arranged at not less than two height positions in the axial direction and are evenly distributed respectively, and the flush holes at adjacent height positions are arranged staggered.

[0013] Beneficial effects are as follows: I. Multiple sealing structure design: multiple sets of mold pressing sealing elements are arranged on the double long sealing surfaces, which can provide larger sealing contact area, avoid damage to the sealing elements caused by excessive torsion of the setting device, leading to sealing failure, effectively cope with high pressure difference environment of large size casing, and avoid single sealing element fracture failure risk, prolong the service life of the device and support repeated operation, and improve the overall safety; the detachable connector and limiting piece design enables quick replacement of the sealing elements after wear, supporting repeated use of the device; II. Distributed pressure transmission design: the axial direction of the double central tubes is divided into multiple stages of pressure transmission holes, which distribute the setting pressure through multiple points to ensure uniform distribution of pressure and retain the cross-sectional tensile strength, reducing the risk of pipe column deformation; III. Double plugging protection mechanism: the first ball catching sealing surface and the second ball catching sealing surface cooperate to form double plugging, effectively avoiding setting failure caused by single sealing failure, which can significantly improve the reliability of the device in complex working conditions and ensure the safety of downhole operation; IV. Adjustable shearing releasing mechanism: by arranging blind holes on the side wall of the ball catcher, aligning with the shearing screw holes of the lower joint, and then fixing the ball catcher with shearing pins, the number of shearing screws can be flexibly set to achieve controllable releasing, avoid overload stretching leading to pipe column deformation, and support adaptation to various downhole pressure environments; and the ball catcher can be quickly disassembled and replaced, so that the device can be reused; V. Modular detachable structure design: the upper joint, upper central tube, lower central tube, lower joint and other components can be quickly disassembled, this modular design can replace or use upgraded core components at any time, only the wear parts need to be replaced to put the device into use again, realizing the reuse of the device and greatly reducing the overall replacement cost. BRIEF DESCRIPTION OF DRAWINGS

[0014] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the device; Figure 2 This is a schematic diagram showing the location and structure of blind holes and shear screw holes; Figure 3 This is a schematic diagram of the structure of the first molded seal. Figure 4 This is a schematic diagram showing the positional relationship between the catcher and the lower connector before the catcher is released. Figure 5 This is a schematic diagram showing the positional relationship between the catcher and the lower connector after the catcher is released. Figure 6 This is a schematic diagram showing the packer being fed into this device. In the picture: 1. Upper connector; 11. Rod portion; 12. First cone portion; 121. Stop step; 13. First cylindrical portion; 131. First molded seal; 1311. Molded seal frame; 13111. First annular sealing groove; 13112. First sealing ring; 1312. First sealing element; 1313. Second sealing element; 132. Second molded seal; 133. Third molded seal; 14. First inner cavity; 2. Connector; 3. Upper central tube; 31. Second inner cavity; 32. First pressure transmission hole; 33. Second pressure transmission hole; 4. Lower central tube; 41. Third inner cavity; 42. Third pressure transmission hole; 43. Fourth pressure transmission hole; 5. Lower connector; 51. Second cylindrical portion; 511. Fourth molded seal; 512. Fifth molded seal; 513. Sixth molded seal; 52. Second cone portion; 521. Limiting element; 53. Neck; 531. Shear screw hole; 54. Fourth inner cavity; 541. First cylindrical cavity; 542. Second cylindrical cavity; 5421. Second annular sealing groove; 5422. Second sealing ring; 543. First ball-catching sealing surface; 6. Ball catcher; 61. Fifth inner cavity; 611. Second ball-catching sealing surface; 612. Third cylindrical cavity; 62. Blind hole; 63. Adjustment groove; 7. Guide end cap; 71. Sixth inner cavity; 711. Stop surface; 72. Flushing hole; 8. First sealing ball; 9. Second sealing ball. Detailed Implementation

[0015] The following drawings disclose several embodiments of the present invention. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, these practical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0016] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indication will also change accordingly.

[0017] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, such a combination should be considered nonexistent and not within the scope of protection claimed by this invention.

[0018] Example Please see Figure 1 , Figure 1 This is a schematic diagram of the overall structure of the device. This embodiment provides a safe, reliable and reusable setting device, which includes, from top to bottom, an upper connector 1, a connector 2, an upper central tube 3, a lower central tube 4, a lower connector 5, a ball catcher 6, and a guide end cap 7.

[0019] See also Figure 1 The upper connector 1 is composed of a rod 11, a first cone 12 and a first cylindrical part 13 in sequence. The rod 11 is threaded for threaded connection with the tubing or drill pipe. A stop step 121 is provided at the connection between the first cone 12 and the first cylindrical part 13. A first long sealing surface is provided on the side wall of the first cylindrical part 13. At least three sets of molded seals are arranged on the first long sealing surface, namely the first molded seal 131, the second molded seal 132 and the third molded seal 133. The upper connector 1 has a first inner cavity 14 that is connected in series with the well pipe.

[0020] Connector 2 is detachably connected to the upper connector 1 and the upper central tube 3 at both ends, respectively, using threaded connections followed by fastening with screws or other fasteners. Specifically, connector 2 has threaded female connectors at both ends, and the first cylindrical portion 13 and the upper central tube 3 each have threaded male connectors near the connector 2. The detachable connection between connector 2 and the upper connector 1 and the upper central tube 3 is achieved by screwing the threaded female connectors to the threaded male connectors. Connector 2 also has a first folded edge at the threaded female connector end, and the first cylindrical portion 13 and the upper central tube 3 each have a second folded edge at the threaded female connector end. The first and second folded edges have corresponding screw holes, which are locked in place by screws engaging with the screw holes. Connector 2 abuts against three sets of molded seals on the first long sealing surface. Thus, once connector 2 is screwed to the upper connector 1, the assembly process of multiple sets of molded seals is completed. The multiple sets of molded seals are confined on the first long sealing surface, forming a surface-to-surface sealing contact with the packer.

[0021] The upper central tube 3 has a second inner cavity 31 that communicates with the first inner cavity 14. The upper central tube 3 has at least two pressure-transmitting holes at at least two height positions along the axial direction. Specifically, the upper central tube 3 has two first pressure-transmitting holes 32 and two second pressure-transmitting holes 33 at two different height positions along the axial direction. In other words, the upper central tube 3 has two first pressure-transmitting holes 32 at the same height position along the axial direction, and two second pressure-transmitting holes 33 at another equal height position, with the two height positions separated by a certain distance.

[0022] The lower central tube 4 is detachably connected to the upper central tube 3. The lower central tube 4 has a third inner cavity 41 communicating with the second inner cavity 31. The lower central tube 4 has at least two pressure-transmitting holes at each of at least two height positions along the axial direction. Specifically, the lower central tube 4 has two third pressure-transmitting holes 42 and two fourth pressure-transmitting holes 43 at two different height positions along the axial direction. In other words, the lower central tube 4 has two third pressure-transmitting holes 42 at the same height position along the axial direction, and two fourth pressure-transmitting holes 43 at another equal height position, with the two height positions separated by a certain distance.

[0023] The upper and lower center tubes employ this design of a few pressure-transmitting holes in multiple locations. This not only ensures that hydraulic pressure is evenly transmitted to different height positions, reducing pressure gradient differences, avoiding local stress concentration, improving pressure transmission stability, and reducing the risk of blockage, but also prevents weakening of the cross-sectional tensile strength and enhances the tensile performance of the tubing string. Furthermore, this redundant design ensures that even if some pressure-transmitting holes are blocked by impurities, other holes can still maintain pressure transmission, guaranteeing the stability of the system under complex operating conditions. Here, "few" refers to designing only 1-2 pressure-transmitting holes on the same cross-section, rather than 3 or more; and "multiple locations" refers to designing multiple pressure-transmitting holes at different height positions, rather than multiple holes at the same height position.

[0024] See also Figure 1 The lower connector 5 and the lower central tube 4 are detachably connected. Specifically, a threaded connection can be selected, followed by fastening with fasteners. The lower connector 5 is composed of a second cylindrical part 51, a second conical part 52, and a neck 53. The second cylindrical part 51 has a second long sealing surface on its side wall. The second long sealing surface has at least three sets of molded seals, namely a fourth molded seal 511, a fifth molded seal 512, and a sixth molded seal 513. The limiting member 521 is detachably connected to the second conical part 52 and abuts against the molded seals. The neck 53 is provided with... There are shear screw holes 531. The number of shear screw holes 531 is set to be 2 to 3 times the actual number of shear screw holes 531 required to meet the expected release pressure. For example, assuming that a ball catcher 6 requires a release pressure of 10 MPa, and each shear screw can withstand an equivalent pressure of 2 MPa, then theoretically 5 shear screws are needed. In this case, 10 shear screw holes 531 can be designed in the neck 53. By selectively installing a few shear screws in the 10 holes, the total shear force can be precisely adjusted to adapt to different release pressure requirements. Release is the operation of separating the setting device from the packer. This design allows the operator to precisely adjust and control the release pressure by increasing or decreasing the number of installed shear screws according to the specific working environment, geological conditions, or emergency, without changing the equipment or using additional tools. Having twice the number of screw holes also increases the reliability and safety of the system. When some screws fail due to abnormal conditions, there are spare screw holes available to ensure that the system can operate normally under the predetermined pressure. The lower connector 5 is also provided with a fourth inner cavity 54 that communicates with the third inner cavity 41. The fourth inner cavity 54 includes a first cylindrical cavity 541 and a second cylindrical cavity 542. The diameter of the first cylindrical cavity 541 is larger than the cross-sectional diameter of the second cylindrical cavity 542. The first cylindrical cavity 541 and the second cylindrical cavity 542 are connected by a first ball-catching sealing surface 543. The diameter of the first sealing ball 8 is larger than the diameter of the second cylindrical cavity 542.

[0025] Please refer to the following: Figure 1 Combined again Figure 2 and Figure 4 , Figure 2 This is a schematic diagram showing the location and structure of blind holes and shear screw holes. Figure 4This is a schematic diagram showing the positional relationship between the ball catcher and the lower connector before the ball catcher is released. The ball catcher 6 is located inside the second cylindrical cavity 542 of the lower connector 5. The ball catcher 6 has a fifth inner cavity 61 that communicates with the fourth inner cavity 54. The fifth inner cavity 61 includes a third cylindrical cavity 612 and a constricted second ball catcher sealing surface 611. The diameter of the third cylindrical cavity 612 is equal to the minimum diameter of the constricted second ball catcher sealing surface 611. The diameter of the second sealing ball 9 is larger than the cross-sectional diameter of the third cylindrical cavity 612. The bottom wall of the ball catcher 6 has an adjustment groove 63, and the side wall of the ball catcher 6 has blind holes 62. The number of blind holes 62 is greater than or equal to the number of shear screw holes 531. Of course, the blind holes 62 can also be designed as arc-shaped slots instead. The ball catcher 6 can be rotated by driving the adjustment groove 63 with a tool so that the blind holes 62 are aligned with the shear screw holes 531. Then, fasteners are inserted into the shear screw holes 531 and blind holes 62 to fasten the ball catcher 6 to the lower connector 5. The operation is simple and does not require special tools, and the work efficiency is significantly improved. The ball catcher 6 has a short sealing surface on its outer side. The second cylindrical cavity 542 has a second annular sealing groove 5421 on the side that contacts the short sealing surface, that is, on the side of the second cylindrical cavity 542 facing the short sealing surface. The second annular sealing groove 5421 has a second sealing ring 5422 inside it. This can prevent fluid from leaking from the gap between the ball catcher 6 and the lower connector 5 and ensure stable transmission of internal cavity pressure.

[0026] The guide end cover 7 is detachably connected to the lower connector 5. The guide end cover 7 is provided with a sixth inner cavity 71 that communicates with the fifth inner cavity 61 and the external space respectively. The diameter of the sixth inner cavity 71 is larger than the outer diameter of the ball catcher 6. The end of the sixth inner cavity 71 away from the ball catcher 6 is provided with a constricted stop surface 711. The diameter of the second sealing ball 9 is larger than the minimum diameter of the constricted stop surface 711. The guide end cap 7 has a flushing hole 72 that penetrates the sixth inner cavity 71 on its side wall. The flushing hole 72 is inclined and at least four flushing holes 72 are evenly distributed at no less than two height positions along the axial direction. The flushing holes 72 at adjacent height positions are staggered. This inclined angle design and staggered layout can generate a spiral flushing flow to achieve efficient self-cleaning of the inner cavity. At the same time, these flushing holes 72 are also drainage channels connecting the inside and outside of the tubing after the ball catcher 6 is sheared and released, which avoids the backflow of liquid in the inner cavity when the tubing is pulled out and causes surface pollution, thus ensuring operational safety. When the setting device is in the well and no ball is dropped, the cleaning fluid is injected by the surface pump truck under positive pressure to achieve a dual cleaning effect. This not only completes the high-pressure pulse flushing of the inner cavity of the device, but also refreshes the casing annulus cleaning fluid through the principle of positive pressure replacement, effectively ensuring the environmental safety and operational reliability of downhole operations.

[0027] Please refer to the following: Figure 1 Combined again Figure 3 , Figure 3This is a schematic diagram of the first molded seal. The first molded seal 131, second molded seal 132, third molded seal 133, fourth molded seal 511, fifth molded seal 512, and sixth molded seal 513 have the same structure. Each molded seal includes a molded sealing frame 1311, a first sealing element 1312, and a second sealing element 1313. The molded sealing frame 1311 is inverted T-shaped and positioned on either the first or second long sealing surface. The first sealing element 1312 and the second sealing element 1313 are located on opposite sides of the frame. A first annular sealing groove 13111 is provided on the side of the molded sealing frame 1311 that contacts the first long sealing surface, and a first sealing ring 13112 is provided within the first annular sealing groove 13111. Similarly, a first annular sealing groove 13111 is also provided on the side of the molded sealing frame 13111 facing the second long sealing surface, and a first sealing ring 13112 is provided within the first annular sealing groove 13111. The molded sealing frame 1311 is made of metal materials, such as steel, iron, copper, titanium, stainless steel, aluminum alloy, copper alloy, or titanium alloy. The first sealing element 1312 and the second sealing element 1313 are both made of elastic materials, such as polyurethane, rubber, or silicone. The metal frame provides rigid support, while the elastic material adapts to deformation, forming a double sealing barrier to prevent wellbore fluid leakage. The inverted T-shaped frame and double-sided sealing groove design enhance resistance to high pressure differentials. This device has up to six sets of molded seals forming multiple lines of defense, and each set includes a metal frame and elastic material, effectively preventing seal damage, improving sealing reliability, and ensuring operational safety.

[0028] Please refer to the following: Figure 1 Combined again Figure 6 , Figure 6 This is a schematic diagram showing the packer insertion state of this device. During use, first confirm the required number of shear screws and calculate the accurate release pressure. Then, connect the tubing or drill pipe via the upper connector 1 and insert it downhole. The setting device reaches the packer position, and the tubing is blocked from further downward movement due to the stop step of the upper connector 1 contacting the stop surface on the upper part of the packer. This indicates that the setting device has reached the target position, and the multiple sets of molded seals at the upper and lower parts have sealed the upper and lower sealing surfaces of the packer. The second sealing ball 9 can then be dropped from the surface. The second sealing ball 9 and the constricted second ball-catching sealing surface 611 form a primary seal. Pressure can then be applied from the surface to complete the packer setting. If the primary seal fails at this point, the first sealing ball 8 can be dropped from the surface. The first sealing ball 8 and the first ball-catching sealing surface 543 cooperate to achieve a secondary seal. The first ball-catching sealing surface 543 serves as a backup safety measure. If the second ball-catching sealing surface 611 accidentally loses its seal, the first sealing ball 8 can be dropped onto the first ball-catching sealing surface 543 to continue the sealing effect on the setting device. Please refer to [link / reference]. Figure 5 ,Figure 5 This diagram illustrates the relationship between the catcher and the lower connector after the catcher is released. After the packer is set, the pressure is increased to the preset release pressure of the setting device to release the catcher 6. The catcher 6 will then fall and press against the stop surface 711 of the guide end cap 7, exposing the flushing hole 72. At this point, the inner and outer spaces of the tubing or drill string will be connected, and the pressure inside the string will be connected and balanced with the bottom formation pressure after the packer is sealed. When the string and setting device are removed to the surface, no additional force is required to counteract the hydrostatic pressure, and the fluid inside the string will not be carried out to the surface working platform, avoiding contamination and corrosion of the surface working platform and affecting the personal and operational safety of the workers. Here, the hydrostatic pressure refers to the static pressure generated by the fluid in the wellbore due to its vertical height, and its magnitude is proportional to the fluid density and well depth.

[0029] This device utilizes multiple sets of molded seals with double-long sealing surfaces to provide a larger sealing contact area. It also prevents seal damage and failure due to excessive torsion of the setting device, effectively addressing the high pressure differential environment of large-size bushings. Combined with a distributed sealing layout, it avoids the risk of single seal breakage, extending the device's service life and supporting repeated operation, thus improving overall safety. The detachable connector 2 and limiting component 521 design allow for quick replacement of worn seals, supporting device reuse. Multiple pressure transmission holes axially distributed along the double-center tubes transmit the setting pressure to the tubing through multiple distributed points, ensuring uniform pressure distribution while preserving cross-sectional tensile strength and reducing the risk of tubing deformation. The first ball-catching sealing surface 543 and the second ball-catching sealing surface 611 cooperate to form a double seal, effectively preventing… Preventing single-seal failure leading to setting failure significantly improves the reliability of the device under complex operating conditions and ensures downhole operation safety. By setting blind holes 62 on the side wall of the ball catcher 6 and aligning them with the shear screw holes 531 of the lower connector 5, the ball catcher 6 is fixed with shear pins. This allows for control over the number of shear screws and flexible setting of release pressure to achieve controllable release, avoiding overload stretching that could cause tubing deformation. It supports adaptability to various downhole pressure environments. Furthermore, the ball catcher 6 can be quickly disassembled and replaced, allowing the device to be reused. Components such as the upper connector 1, upper central tube 3, lower central tube 4, and lower connector 5 are connected by threads for quick disassembly and assembly. This modular design allows for the replacement or use of upgraded core components at any time. Only vulnerable parts need to be replaced for reuse, enabling the device to be reused and greatly reducing overall replacement costs.

[0030] In summary, this device comprehensively enhances the reliability and safety of the setting device in complex downhole environments through the organic combination of several innovative technologies, including a multi-layered sealing structure design, a distributed pressure transmission design, a dual-sealing guarantee mechanism, an adjustable shear release mechanism, and a modular, detachable structural design. Its superior sealing performance and pressure distribution capabilities can adapt to the requirements of large-size casing and high-pressure differential conditions; while the dual-sealing and controllable release functions effectively avoid the risk of operational failure due to the failure of a single component, significantly improving the success rate of operations. Furthermore, the modular design concept not only facilitates maintenance and rapid replacement of vulnerable parts but also significantly reduces operating costs and maintenance cycles, improving the equipment's economy and practicality. Whether in conventional oil and gas extraction or under extremely complex special conditions such as high temperature, high pressure, and high corrosion, this device can operate stably, significantly improving operational efficiency and extending equipment lifespan with its high adaptability and reusability, providing a safe, efficient, and economical comprehensive solution for oil and gas field extraction, downhole engineering, and other fields.

[0031] The above are merely embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A setting device, characterized in that, include: The upper connector is composed of a rod, a first cone and a first cylindrical part in sequence. A stop step is provided at the connection between the first cone and the first cylindrical part. A first long sealing surface is provided on the side wall of the first cylindrical part. At least three sets of molded sealing elements are arranged on the first long sealing surface. The upper connector has a first inner cavity that communicates with the external environment. A connector, detachably connected to the upper connector, and abutting against the molded seal; The upper central tube is detachably connected to the connector and has a second inner cavity that communicates with the first inner cavity. The upper central tube is provided with at least two pressure transmission holes at at least two height positions along the axial direction. The lower central tube is detachably connected to the upper central tube and has a third inner cavity that communicates with the second inner cavity. The lower central tube has at least two pressure transmission holes at at least two height positions along the axial direction. The lower connector is detachably connected to the lower central tube and consists of a second cylindrical part, a second conical part, and a neck. The second cylindrical part has a second long sealing surface on its side wall and at least three sets of molded seals on the second long sealing surface. The limiting member is detachably connected to the second conical part and abuts against the molded seals. The neck has a shear screw hole. The lower connector also has a fourth inner cavity that communicates with the third inner cavity. The fourth inner cavity includes a first cylindrical cavity and a second cylindrical cavity. The diameter of the first cylindrical cavity is larger than the diameter of the second cylindrical cavity. The first cylindrical cavity and the second cylindrical cavity are connected by a first ball-catching sealing surface. A ball catcher is disposed in the second cylindrical cavity of the lower connector. The ball catcher has a fifth inner cavity that communicates with the fourth inner cavity. The fifth inner cavity includes a constricted second ball-catching sealing surface and a third cylindrical cavity. The diameter of the third cylindrical cavity is equal to the minimum diameter of the constricted second ball-catching sealing surface. The side wall of the ball catcher is provided with blind holes or arc-shaped slots. The blind holes or arc-shaped slots correspond to the positions of the shear screw holes. The ball catcher is fastened to the lower connector by inserting fasteners through the shear screw holes and blind holes or by inserting fasteners through the shear screw holes and arc-shaped slots. The guide end cap is detachably connected to the lower connector. The guide end cap has a sixth inner cavity that communicates with the fifth inner cavity and the external space respectively. The diameter of the sixth inner cavity is larger than the outer diameter of the ball catcher. The end of the sixth inner cavity away from the ball catcher has a constricted stop surface. The diameter of the second sealing ball is larger than the minimum diameter of the constricted stop surface.

2. The setting device according to claim 1, characterized in that, The three molded seals on the first long sealing surface are the first molded seal, the second molded seal, and the third molded seal, and the three molded seals on the second long sealing surface are the fourth molded seal, the fifth molded seal, and the sixth molded seal. Each molded seal has the same structure, including a molded sealing frame, a first sealing element, and a second sealing element. The molded sealing frame is in the shape of an inverted T on the first or second long sealing surface, and the first and second sealing elements are located on its two sides. The side of the molded sealing frame that contacts the first or second long sealing surface is provided with a first annular sealing groove, and a first sealing ring is provided in the first annular sealing groove.

3. The setting device according to claim 2, characterized in that, The molded sealing frame is made of metal.

4. The setting device according to claim 2, characterized in that, Both the first sealing element and the second sealing element are made of elastic material.

5. The setting device according to claim 1, characterized in that, The two ends of the connector are respectively threaded to the first cylindrical part and the upper central tube.

6. The setting device according to claim 1, characterized in that, The upper central tube is provided with a first pressure transmitting hole and a second pressure transmitting hole at two different height positions along the axial direction, and the lower central tube is provided with a third pressure transmitting hole and a fourth pressure transmitting hole at two different height positions along the axial direction. There are two of each of the first, second, third, and fourth pressure transmitting holes.

7. The setting device according to claim 1, characterized in that, The number of shear screw holes is set to be 2 to 3 times the actual number of shear screw holes required to meet the expected release pressure.

8. The setting device according to claim 1, characterized in that, The ball catcher has a short sealing surface on its outer side, and the second cylindrical cavity has a second annular sealing groove on the side that contacts the short sealing surface. A second sealing ring is provided in the second annular sealing groove.

9. The setting device according to claim 1, characterized in that, The ball catcher has an adjustment groove on its bottom wall.

10. The setting device according to claim 1, characterized in that, The guide end cap has a flushing hole that penetrates the sixth inner cavity on its side wall, and at least four flushing holes are evenly distributed at no less than two height positions along the axial direction, with the flushing holes at adjacent height positions being staggered.

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