Safety tubing anchor

Abstract

The utility model discloses a safety type tubing anchor which comprises a tubing main body, the tubing main body extends in the vertical direction, a tubing through hole penetrates through the tubing main body, a liquid inlet hole penetrates through the side wall of the tubing main body, an unblocking lock ring is arranged on the tubing main body, the tubing main body is coaxially sleeved with a movable module, and the movable module can move upwards relative to the unblocking lock ring. An anti-setting lock ring is arranged between the movable module and the oil pipe body, an anti-setting shear pin is connected between the anti-setting lock ring and the oil pipe body, and a liquid inlet cavity is defined by the outer wall of the oil pipe body and the inner wall of the movable module. The slips are arranged on the outer side of the oil pipe main body, each slip is provided with two inclined planes, and the two inclined planes of the slips are respectively matched with the oil pipe main body and the outer cone of the movable module. The safe tubing anchor is used for improving the jam releasing success rate, ensuring smooth proceeding of oil exploitation and water injection operation and reducing the operation cost and risk.

Description

Technical Field

[0001] This utility model belongs to the technical field of oilfield production equipment and relates to a safety-type tubing anchor. Background Technology

[0002] In oil extraction and water injection operations, tubing anchors are crucial tools, widely used in both oil wells and water injection wells. Their primary function is to anchor the tubing to the casing, preventing creep and thus reducing problems such as packer failure, tubing failure, and pump stroke loss caused by tubing creep, effectively extending the working life of the tubing. Due to historical reasons, some oilfields have significant deficiencies in water injection; therefore, addressing the shortcomings in water injection and gathering systems is crucial for stable production in current oilfield development.

[0003] For high-temperature, high-pressure deep well water injection, the contradiction between the complexity of the tubing string and safety is prominent. Tubing strings without anchoring tools have poor stability and are prone to seal failure due to tubing creep, while other anti-creep tubing strings are difficult to operate. Using tubing strings with anchoring tools presents challenges in unsealing, easily leading to major workovers. Furthermore, severe tubing corrosion has been observed, manifesting in various forms such as corrosion perforation, scaling, corrosion cracks, and corrosion detachment, with water injection wells exhibiting extremely severe corrosion. These problems have led to numerous workovers, shutdowns, and abandonments of oil and water wells, with water wells experiencing a higher number of workovers. This severely impacts the use of anchoring tools, causes significant economic losses to oil production units, and seriously affects the normal operation and production efficiency of oil and water wells.

[0004] Currently, tubing anchors are mainly classified into five categories: mechanical slip tubing anchors, hydraulic tubing anchors, tubing tension anchors, hydraulic bidirectional slip tubing anchors, and hydraulic unidirectional slip tubing anchors. Due to the different structural principles of each type of tubing anchor, their field application effects also differ. Among them, bidirectional slip tubing anchors can achieve bidirectional anchoring of the tubing string, offering certain advantages in practical applications. However, existing bidirectional tubing anchors suffer from a low success rate in releasing the jamming. During the release process, situations may arise where the slips fail to retract, making release impossible. This causes significant problems for oil extraction and water injection operations. Utility Model Content

[0005] The purpose of this invention is to provide a safe tubing anchor, which solves the problem of tubing anchors being unable to be released in the prior art.

[0006] The technical solution adopted by this utility model is a safety-type tubing anchor, including a tubing body that extends vertically and has a through-hole. A liquid inlet hole is also provided through the side wall of the tubing body. An unblocking ring is provided on the tubing body, and a movable module is coaxially sleeved on the tubing body. The movable module can move upward relative to the unblocking ring. An anti-seat sealing ring is provided between the movable module and the tubing body. An anti-seat sealing shear pin is connected between the anti-seat sealing ring and the tubing body. The outer wall of the tubing body and the inner wall of the movable module form a liquid inlet cavity.

[0007] Several slips are provided on the outside of the tubing body. Each slip has two inclined surfaces, which respectively mate with the tubing body and the outer cone of the movable module.

[0008] The features of this utility model also include:

[0009] The tubing body includes an upper connector, a central tube, and a lower connector that are screwed together from top to bottom. The upper connector is provided with a sealing ring at the interface between the upper connector and the central tube. The fluid inlet is located on the central tube. The lower connector is provided with a fourth locking tooth. The outer cone of the tubing body is located on the upper connector and gradually narrows from top to bottom.

[0010] The movable module includes a hydraulic cylinder assembly and a piston. The hydraulic cylinder assembly includes a cone, a locking sleeve, a hydraulic cylinder body, and an unsealing sleeve that are screwed together from top to bottom. The piston is clamped between the unsealing sleeve and the central tube. The outer cone of the movable module is located on the cone and gradually narrows from bottom to top.

[0011] The liquid inlet includes a first liquid inlet and a second liquid inlet, and the liquid inlet cavity includes a first liquid inlet cavity and a second liquid inlet cavity. The first liquid inlet is connected to the first liquid inlet cavity, and the second liquid inlet is connected to the second liquid inlet cavity.

[0012] The first liquid inlet chamber is formed by a central tube, a locking sleeve, and a cone. A first cone sealing ring is provided at the joint between the cone and the central tube, a second cone sealing ring is provided at the joint between the cone and the locking sleeve, and a first central tube sealing ring is provided at the joint between the central tube and the locking sleeve.

[0013] The second liquid inlet chamber is formed by a central tube, a lower connector, a piston, and a liquid cylinder body. A first piston sealing ring is provided at the joint between the piston and the central tube, a second piston sealing ring is provided at the joint between the piston and the liquid cylinder body, and a lower connector sealing ring is provided at the joint between the lower connector and the liquid cylinder body.

[0014] It also includes a slip sleeve, which is coaxially fitted with the tubing body. A vertebral guide pin is fixedly connected to the vertebral body. The upper end of the slip sleeve slides in a vertical direction with the vertebral guide pin. An upper connector guide pin is fixedly connected to the upper connector. The lower end of the slip sleeve slides in a vertical direction with the upper connector guide pin. The slip and the slip sleeve are movably connected. The slip can move radially along the tubing body.

[0015] The slip includes a slip body and several anchor blocks embedded in the slip body. The anchor blocks are made of alloy. The end face of the anchor block is set at an angle to the radial direction of the tubing body. Several slips have slip through grooves at the ends away from the tubing body, and the slip sleeves are embedded in the slip through grooves.

[0016] The unlocking ring includes a locking ring body and a locking ring sleeve. The locking ring body is sleeved on the oil pipe body. The outer ring of the locking ring body is unidirectionally slidably connected to the inner wall of the locking ring sleeve. The locking ring sleeve is fixed to one end of the locking ring body. An unlocking shear pin is connected between the unlocking ring and the oil pipe body. The unlocking shear pin is threadedly connected to the locking ring sleeve. One end of the unlocking shear pin passes through the locking ring sleeve and is embedded in the counterbore of the central tube.

[0017] It also includes an elastic ring, which is fitted onto the main body of the tubing and presses against the bottom of several slip grooves;

[0018] The inner wall of the lock sleeve is provided with a first locking tooth, and the outer ring of the lock ring body is provided with a second locking tooth. When the lock ring body is subjected to force, it undergoes elastic deformation in the vertical direction, and the first locking tooth and the second locking tooth cooperate.

[0019] The tubing body is fitted with an annular locking ring seat. The anti-seat sealing ring includes a locking ring seat, an inner locking ring, and an outer locking ring. The inner locking ring is located on the inner ring of the locking ring seat and is unidirectionally slidably connected to the outer wall of the tubing body. The outer locking ring is located on the outer ring of the locking ring seat and is unidirectionally slidably connected to the inner wall of the unsealing sleeve. The anti-seat sealing shear pin is threadedly connected to the locking ring seat. One end of the anti-seat sealing shear pin passes through the locking ring seat and is embedded in the countersunk hole of the lower connector.

[0020] The inner ring of the inner locking ring is provided with a third locking tooth, and the outer wall of the lower connector is provided with a fourth locking tooth. When the inner locking ring is subjected to force, it undergoes elastic deformation in the vertical direction, and the third locking tooth and the fourth locking tooth cooperate.

[0021] The outer locking ring has a fifth locking tooth on its outer ring and a sixth locking tooth on the inner wall of the unsealing sleeve. When the outer locking ring is subjected to force, it undergoes elastic deformation in the vertical direction, and the fifth locking tooth and the sixth locking tooth cooperate with each other.

[0022] The beneficial effects of this utility model are:

[0023] This utility model of a safety-type tubing anchor, through the shear pin cooperation structure of the anti-seating sealing ring and the unsealing ring, ensures the safe triggering of the anchoring process and the reliability of the unsealing operation, thereby reducing the risk of accidental anchoring and effectively preventing the tubing anchor from accidentally sealing under pressure fluctuations. It ensures precise control of the anchoring action and guarantees that the device will only start under the set pressure. The auxiliary unsealing structure of the safety-type tubing anchor can forcibly separate the slips from the outer cone during the unsealing process by lifting and lowering the tubing body, improving the success rate of unsealing and solving the problem of difficult unsealing of bidirectional tubing anchors. The above operation is highly safe, low in cost, and simple to operate.

[0024] This novel safety tubing anchor utilizes a sleeve design between the tubing body and the movable module, enabling non-mechanical triggering through a hydraulic drive mechanism in the inlet chamber. This allows for precise shearing control of the anti-seating shear pin, avoiding the jamming defects of traditional mechanical anchoring devices. It ensures the controllability of the anchoring force application process and guarantees structural synergy. The slips utilize double bevels on both sides to engage with the outer cones of the tubing body and the movable module, respectively. The bidirectional wedge-shaped bevel design creates a bidirectional mechanical anchoring structure between the slips and the casing, significantly improving the symmetry and stability of the anchoring force. This effectively eliminates the risk of seal failure caused by tubing string creep, providing both anchoring and unsealing capabilities. This is of great significance for improving the injection success rate in oilfields, reducing losses from major workovers due to tubing string jamming, and lowering the maintenance costs of oil and water wells. Its application prospects are broad. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the safety-type tubing anchor of this utility model;

[0026] Figure 2 This utility model is a safety type of tubing anchor. Figure 1 A magnified view of part A in the image;

[0027] Figure 3 This is a partial cross-sectional view of the safety-type tubing anchor of this utility model in its initial state;

[0028] Figure 4 This is a partial cross-sectional view of the safety-type tubing anchor of this utility model in the seated state;

[0029] Figure 5 This is a partial cross-sectional view of the safety-type tubing anchor of this utility model in the lifted and unsealed state;

[0030] Figure 6 This is a partial cross-sectional view of the safety-type tubing anchor of this utility model in the lowered and unsealed state.

[0031] In the diagram, 100. Oil pipe body; 101. Oil pipe through hole; 110. Upper connector; 111. Upper connector sealing ring; 112. Upper connector guide pin; 120. Central tube; 121. First inlet hole; 122. Second inlet hole; 130. Lower connector; 131. Fourth locking tooth; 200. Hydraulic cylinder assembly; 210. Hydraulic cylinder body; 220. Unsealing sleeve; 221. Sixth locking tooth; 230. Locking sleeve; 231. First locking tooth; 240. Cone body; 241. First cone body sealing ring; 242. Second cone body sealing ring. ; 243. Cone guide pin; 300. Slip sleeve; 400. Slip; 410. Slip body; 411. Slip through groove; 420. Anchor block; 500. Elastic ring; 600. Unlocking ring; 610. Locking ring body; 620. Locking ring sleeve; 630. Unlocking shear pin; 700. Piston; 701. First piston sealing ring; 702. Second piston sealing ring; 800. Anti-seat sealing ring; 810. Locking ring seat; 820. Inner locking ring; 830. Outer locking ring; 840. Anti-seat sealing shear pin; 900. Sleeve. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0033] Safety-type tubing anchors, such as Figure 1 As shown, the system includes an oil pipe body 100, which extends vertically and has a through-hole 101. A fluid inlet hole is also present on the side wall of the oil pipe body 100. An unsealing ring 600 is provided on the oil pipe body 100, and a movable module is coaxially fitted onto the oil pipe body 100. The movable module can move upward relative to the unsealing ring 600. Figure 2 As shown, an anti-seat sealing ring 800 is provided between the active module and the oil pipe body 100, and an anti-seat sealing shear pin 840 is connected between the anti-seat sealing ring 800 and the oil pipe body 100. The outer wall of the oil pipe body 100 and the inner wall of the active module form a liquid inlet cavity.

[0034] Several slips 400 are provided on the outside of the tubing body 100. Each slip 400 has two inclined surfaces, which respectively cooperate with the tubing body 100 and the outer cone of the movable module.

[0035] like Figure 1 As shown, the oil pipe body 100 includes an upper connector 110, a central pipe 120 and a lower connector 130 that are screwed together from top to bottom. An upper connector sealing ring 111 is provided at the interface between the upper connector 110 and the central pipe 120. An inlet hole is provided on the central pipe 120. A fourth locking tooth 131 is provided on the lower connector 130. The outer cone of the oil pipe body 100 is provided on the upper connector 110 and gradually narrows from top to bottom.

[0036] The movable module includes a hydraulic cylinder assembly 200 and a piston 700. The hydraulic cylinder assembly 200 includes a cone 240, a locking sleeve 230, a hydraulic cylinder body 210, and an unsealing sleeve 220, which are screwed together from top to bottom. The piston 700 is clamped between the unsealing sleeve 220 and the central tube 120. The outer cone of the movable module is located on the cone 240 and gradually narrows from bottom to top.

[0037] like Figure 3 As shown, the liquid inlet includes a first liquid inlet 121 and a second liquid inlet 122, and the liquid inlet cavity includes a first liquid inlet cavity and a second liquid inlet cavity. The first liquid inlet 121 communicates with the first liquid inlet cavity, and the second liquid inlet 122 communicates with the second liquid inlet cavity. The first liquid inlet cavity is formed by a central tube 120, a locking sleeve 230, and a cone 240. A first cone sealing ring 241 is provided at the joint between the cone 240 and the central tube 120, and a second cone sealing ring 241 is provided at the joint between the cone 240 and the locking sleeve 230. A sealing ring 242 is provided at the joint between the central tube 120 and the locking sleeve 230, and a first central tube sealing ring is provided at the joint between the central tube 120, the lower connector 130, the piston 700 and the cylinder body 210. A first piston sealing ring 701 is provided at the joint between the piston 700 and the central tube 120, a second piston sealing ring 702 is provided at the joint between the piston 700 and the cylinder body 210, and a lower connector sealing ring is provided at the joint between the lower connector 130 and the cylinder body 210.

[0038] It also includes a slip sleeve 300, which is coaxially fitted with the tubing body 100. A cone 240 is fixedly connected to a cone guide pin 243. The upper end of the slip sleeve 300 slides in a vertical direction with the cone guide pin 243. An upper connector 110 is fixedly connected to an upper connector guide pin 112. The lower end of the slip sleeve 300 slides in a vertical direction with the upper connector guide pin 112. The slip 400 is movably connected to the slip sleeve 300 and can move radially along the tubing body 100.

[0039] The slip 400 includes a slip body 410 and several anchor blocks 420 embedded in the slip body 410. The anchor blocks 420 are made of alloy. The end face of the anchor block 420 is set at an angle to the radial direction of the oil pipe body 100. Several slips 400 have slip through grooves 411 at the ends away from the oil pipe body 100. The slip sleeve 300 is partially embedded in the slip through grooves 411.

[0040] like Figure 4As shown, the unlocking ring 600 includes a locking ring body 610 and a locking ring sleeve 620. The locking ring body 610 is sleeved on the oil pipe body 100. The outer ring of the locking ring body 610 is unidirectionally slidably connected to the inner wall of the locking sleeve 230. The locking ring sleeve 620 is fixed to one end of the locking ring body 610. An unlocking shear pin 630 is connected between the unlocking ring 600 and the oil pipe body 100. The unlocking shear pin 630 is threadedly connected to the locking ring sleeve 620. One end of the unlocking shear pin 630 passes through the locking ring sleeve 620 and is embedded in the countersunk hole of the central tube 120.

[0041] like Figure 5 As shown, it also includes an elastic ring 500, which is sleeved on the oil pipe body 100 and presses against the bottom of several slip grooves 411; as Figure 6 As shown, the inner wall of the lock sleeve 230 is provided with a first locking tooth 231, and the outer ring of the lock ring body 610 is provided with a second locking tooth. When the lock ring body 610 is subjected to force, it undergoes elastic deformation in the vertical direction, and the first locking tooth 231 and the second locking tooth cooperate.

[0042] like Figure 2 As shown, a ring-shaped locking ring seat 810 is fitted onto the main body 100 of the oil pipe. The anti-seat sealing ring 800 includes a locking ring seat 810, an inner locking ring 820, and an outer locking ring 830. The inner locking ring 820 is located on the inner ring of the locking ring seat 810 and is unidirectionally slidably connected to the outer wall of the main body 100 of the oil pipe. The outer locking ring 830 is located on the outer ring of the locking ring seat 810 and is unidirectionally slidably connected to the inner wall of the unsealing sleeve 220. The anti-seat sealing shear pin 840 is threadedly connected to the locking ring seat 810. One end of the anti-seat sealing shear pin 840 passes through the locking ring seat 810 and is embedded in the countersunk hole of the lower connector 130.

[0043] The inner locking ring 820 has a third locking tooth on its inner ring and a fourth locking tooth 131 on the outer wall of the lower connector 130. When the inner locking ring 820 is subjected to force, it undergoes elastic deformation in the vertical direction. The third locking tooth and the fourth locking tooth 131 cooperate with each other.

[0044] The outer locking ring 830 has a fifth locking tooth on its outer ring, and the inner wall of the unsealing sleeve 220 has a sixth locking tooth 221. When the outer locking ring 830 is subjected to force, it undergoes elastic deformation in the vertical direction, and the fifth locking tooth and the sixth locking tooth 221 cooperate.

[0045] Example 1

[0046] Safety-type tubing anchors, such as Figure 1 As shown, the system includes an oil pipe body 100, which extends vertically and has a through-hole 101. A fluid inlet hole is also present on the side wall of the oil pipe body 100. An unsealing ring 600 is provided on the oil pipe body 100, and a movable module is coaxially fitted onto the oil pipe body 100. The movable module can move upward relative to the unsealing ring 600. Figure 2As shown, an anti-seat sealing ring 800 is provided between the movable module and the oil pipe body 100. An anti-seat sealing shear pin 840 is connected between the anti-seat sealing ring 800 and the oil pipe body 100. When the anti-seat sealing shear pin 840 is sheared, the anti-seat sealing ring 800 can move upward relative to the oil pipe body 100 and the movable module. The outer wall of the oil pipe body 100 and the inner wall of the movable module form a liquid inlet chamber. When the hydraulic pressure in the liquid inlet chamber increases, it can drive the movable module to move relative to the oil pipe body 100 and shear the anti-seat sealing shear pin 840. Several slips 400 are used to contact the sleeve 900. The slips 400 are located on the outside of the oil pipe body 100. Each slip 400 has two inclined surfaces. The two inclined surfaces of the slip 400 respectively cooperate with the outer cone of the oil pipe body 100 and the movable module.

[0047] This safety-type tubing anchor, through the shear pin engagement structure of the anti-seating sealing ring 800 and the unsealing ring 600, ensures safe triggering of the anchoring process and reliable unsealing operation, guaranteeing that the device only starts under a set pressure. The aforementioned auxiliary unsealing structure, by lifting and lowering the tubing body 100, forces the slips 400 to separate from the outer cone during the unsealing process, improving the success rate of unsealing. Utilizing the sleeve design between the tubing body 100 and the movable module, a non-mechanical triggering mechanism, combined with the hydraulic drive mechanism of the inlet chamber, is achieved, thereby realizing precise shearing control of the anti-seating sealing shear pin 840. This avoids the jamming defects of traditional mechanical anchoring devices. The above design ensures the controllability of the anchoring force application process and guarantees structural synergy. Furthermore, the slips 400 utilize double bevels on both sides to engage with the outer cone of the tubing body 100 and the movable module respectively. The bidirectional wedge-shaped bevel design creates a bidirectional mechanical anchoring structure between the slips 400 and the casing 900, significantly improving the symmetry and stability of the anchoring force and effectively eliminating the risk of seal failure caused by the vertical creep of the tubing string.

[0048] Example 2

[0049] Based on the safety-type tubing anchor provided in Example 1, the safety-type tubing anchor provided in this example is as follows: Figure 1 As shown, the oil pipe body 100 includes an upper connector 110, a central pipe 120, and a lower connector 130 that are screwed together from top to bottom. An upper connector sealing ring 111 is provided at the interface between the upper connector 110 and the central pipe 120. An inlet hole is provided on the central pipe 120. A fourth locking tooth 131 is provided on the lower connector 130. The outer cone of the oil pipe body 100 is provided on the upper connector 110 and gradually narrows from top to bottom. The movable module includes a hydraulic cylinder assembly 200 and a piston 700. The hydraulic cylinder assembly 200 includes a cone 240, a locking sleeve 230, a hydraulic cylinder body 210, and a release sleeve 220 that are screwed together from top to bottom. The piston 700 is clamped between the release sleeve 220 and the central pipe 120. The outer cone of the movable module is provided on the cone 240 and gradually narrows from bottom to top.

[0050] like Figure 3 As shown, the liquid inlet includes a first liquid inlet 121 and a second liquid inlet 122, and the liquid inlet cavity includes a first liquid inlet cavity and a second liquid inlet cavity. The first liquid inlet 121 communicates with the first liquid inlet cavity, and the second liquid inlet 122 communicates with the second liquid inlet cavity. The first liquid inlet cavity is formed by a central tube 120, a locking sleeve 230, and a cone 240. A first cone sealing ring 241 is provided at the joint between the cone 240 and the central tube 120, and a second cone sealing ring 241 is provided at the joint between the cone 240 and the locking sleeve 230. A sealing ring 242 is provided at the joint between the central tube 120 and the locking sleeve 230, and a first central tube sealing ring is provided at the joint between the central tube 120, the lower connector 130, the piston 700 and the cylinder body 210. A first piston sealing ring 701 is provided at the joint between the piston 700 and the central tube 120, a second piston sealing ring 702 is provided at the joint between the piston 700 and the cylinder body 210, and a lower connector sealing ring is provided at the joint between the lower connector 130 and the cylinder body 210.

[0051] Example 3

[0052] Based on the safety-type tubing anchor provided in Embodiment 2, the safety-type tubing anchor provided in this embodiment also includes a slip sleeve 300, which is coaxially sleeved with the tubing body 100. A cone 240 is fixedly connected to a cone guide pin 243. The upper end of the slip sleeve 300 slides in a vertical direction with the cone guide pin 243. An upper connector 110 is fixedly connected to an upper connector guide pin 112. The lower end of the slip sleeve 300 slides in a vertical direction with the upper connector guide pin 112. The slip 400 is movably connected to the slip sleeve 300 and can move radially along the tubing body 100.

[0053] The sliding fit structure of the slip sleeve 300 provides a precise radial movement track for the slip 400, forming a guiding constraint to ensure the linear accuracy of the slip 400's radial movement. This ensures the precise and controllable radial movement trajectory of the slip 400 and guarantees uniform contact between the slip 400 and the inner wall of the sleeve 900 when the slip 400 unfolds. This allows the radial force generated by anchoring to be converted into an axial load transmission path, optimizing stress distribution. The aforementioned double sliding fit design eliminates the risk of slip 400 swaying, improves the uniformity of anchoring force distribution, and the separable structure of each component reduces manufacturing difficulty, making the structure easy to maintain and replace.

[0054] The slip 400 includes a slip body 410 and several anchor blocks 420 embedded in the slip body 410. The anchor blocks 420 are made of alloy, while the casing 900 is made of a different material. This difference in material selection avoids cold welding adhesion between homogeneous materials. The high hardness of the alloy material ensures the wear resistance of the anchor blocks 420 under harsh well conditions, increases the anchoring force of the anchor blocks 420, improves anchoring stability, and reduces wear during the anchoring process. The corrosion resistance of the alloy material significantly extends the service life of key components, effectively avoids unsealing failure caused by downhole electrochemical corrosion, and avoids the problem of anchor blocks 420 rusting and being difficult to unseal during the anchoring process. The embedded structure of the anchor blocks 420 breaks through the limitations of traditional integral slip 400s. Through point contact between the hard alloy and the casing 900, a multi-directional interlocking is formed, increasing the anchoring force per unit area and achieving composite anchoring. This helps to reduce the overall material cost while improving the anchoring force. The design of the independent anchor block 420 prevents the propagation of localized damage, ensuring that the failure of a single anchor block 420 does not affect the overall anchoring performance and improves system redundancy. The end face of the anchor block 420 is set at an angle to the radial direction of the tubing body 100. This inclined end face design forms an acute-angle cutting structure, generating a micro-cutting effect during anchoring, enhancing the mechanical engagement strength with the inner wall of the casing 900, ensuring the embedding effect on the casing 900 surface. Furthermore, the angled arrangement changes the direction of contact stress, decomposing the pure radial force into an axial component, effectively preventing axial slippage of the anchor block 420 during operation, reducing the peak stress at the root of the slip 400, preventing stress concentration and shearing at the root of the anchor block 420, and increasing frictional energy dissipation through multi-angle contact surfaces, suppressing tubing vibration and achieving stress optimization.

[0055] Several slips 400 have slip grooves 411 at their ends away from the main body 100 of the tubing, and slip sleeves 300 are partially embedded in the slip grooves 411. The nested structure of the slip grooves 411 and the elastic ring 500 forms an elastic reset mechanism, which provides a continuous reset force through elastic deformation during unsealing, ensuring that the slips 400 quickly retract and reset upon unsealing. The circumferential uniform pressure characteristic of the elastic ring 500 effectively prevents individual slips 400 from becoming misaligned and stuck. Furthermore, the groove bottom contact design increases the contact area and improves the service life of the elastic element. The recessed structure of the slip grooves 411 helps to increase the contact area between the slip sleeves 300 and the slips 400, improving force transmission efficiency while reducing local stress concentration, thereby optimizing contact.

[0056] Example 4

[0057] Based on the safety-type tubing anchor provided in Example 3, the safety-type tubing anchor provided in this example is as follows: Figure 4As shown, the unlocking ring 600 includes a locking ring body 610 and a locking ring sleeve 620. The locking ring body 610 is sleeved on the oil pipe body 100. The outer ring of the locking ring body 610 is unidirectionally slidably connected to the inner wall of the locking sleeve 230. The locking ring sleeve 620 is fixed to one end of the locking ring body 610. An unlocking shear pin 630 is connected between the unlocking ring 600 and the oil pipe body 100. The unlocking shear pin 630 is threadedly connected to the locking ring sleeve 620. One end of the unlocking shear pin 630 passes through the locking ring sleeve 620 and is embedded in the countersunk hole of the central tube 120. When the unlocking shear pin 630 is cut off, the unlocking ring 600 is disengaged from the oil pipe body 100.

[0058] The through-hole structure of the locking ring 620 and the unsealing shear pin 630 forms an unsealing safety mechanism, ensuring that the device remains locked when not operated manually. The one-way sliding connection forms a mechanical check mechanism, ensuring the irreversibility of the unsealing operation, preventing accidental unlocking caused by hydraulic fluctuations, and avoiding accidental relocking during the unsealing process.

[0059] Example 5

[0060] Based on the safety-type tubing anchor provided in Example 4, the safety-type tubing anchor provided in this example is as follows: Figure 5 As shown, it also includes an elastic ring 500, which is sleeved on the oil pipe body 100 and presses against the bottom of several slip grooves 411; as Figure 6 As shown, the inner wall of the lock sleeve 230 is provided with a first locking tooth 231, and the outer ring of the lock ring body 610 is provided with a second locking tooth. When the lock ring body 610 is subjected to force, it undergoes elastic deformation in the vertical direction. The first locking tooth 231 and the second locking tooth engage. The engagement of the first locking tooth 231 and the second locking tooth with the elastic lock ring body 610 forms a progressive engagement mechanism, which improves the load-bearing stability, realizes the linear correspondence between load and locking force, and forms a multi-point contact stress distribution, ensuring the reliability of locking before the shear pin 630 is cut off.

[0061] like Figure 2 As shown, the locking ring seat 810 is an annular component and is sleeved on the oil pipe body 100. The anti-seat sealing ring 800 includes the locking ring seat 810, the inner locking ring 820, and the outer locking ring 830. The inner locking ring 820 is located on the inner ring of the locking ring seat 810 and is unidirectionally slidably connected to the outer wall of the oil pipe body 100. The outer locking ring 830 is located on the outer ring of the locking ring seat 810 and is unidirectionally slidably connected to the inner wall of the unsealing sleeve 220. The anti-seat sealing shear pin 840 is threadedly connected to the locking ring seat 810. One end of the anti-seat sealing shear pin 840 passes through the locking ring seat 810 and is embedded in the countersunk hole of the lower connector 130.

[0062] The inner locking ring 820 and the outer locking ring 830 form a dual locking function to ensure precise triggering of the setting action after the anti-seat shear pin 840 cuts. The independent movement design of the inner locking ring 820 and the outer locking ring 830 achieves bidirectional displacement isolation, eliminating the risk of interference and allowing the inner locking ring 820 and the outer locking ring 830 to slide synchronously. During the setting process, the locking force distribution is automatically adjusted to avoid single-point overload. The annular sleeve structure forms a circumferentially uniform load distribution, improving the resistance to eccentric loads.

[0063] The inner locking ring 820 has a third locking tooth on its inner ring, and the lower connector 130 has a fourth locking tooth 131 on its outer wall. The inner locking ring 820 undergoes elastic deformation in the vertical direction under stress, and the third locking tooth and the fourth locking tooth 131 engage. The outer locking ring 830 has a fifth locking tooth on its outer ring, and the unsealing sleeve 220 has a sixth locking tooth 221 on its inner wall. The outer locking ring 830 undergoes elastic deformation in the vertical direction under stress, and the fifth locking tooth and the sixth locking tooth 221 engage.

[0064] The engagement of the third and fourth locking teeth 131, and the fifth and sixth locking teeth 221, forms a bidirectional anti-retraction structure, ensuring the stability of the device under vibration conditions. The multi-stage locking structure creates a progressive load transfer, avoiding early failure caused by stress concentration. At the same time, the multi-stage locking structure, combined with the deformation structure, forms an overload protection mechanism to prevent structural damage caused by abnormal loads.

[0065] Example 6

[0066] The safety-type tubing anchor provided in Example 5 is used. This example provides a safety-type tubing anchor for anchoring the working conditions of the casing 900, specifically: a rated pressure of 35.0 MPa, a maximum outer diameter of 110.0 mm and a minimum inner diameter of 50.0 mm for the tubing through-hole 101, a rated temperature of -29.0℃ to 82.0℃, and an inner diameter of the suitable casing 900 of 121.4 mm to 124.3 mm.

[0067] like Figure 4 As shown, when sealing the safety-type tubing anchor, it is necessary to first pressurize the tubing through-hole 101. The pressure enters the inlet chamber through the inlet hole, pushing the movable module upward to cut the anti-seating sealing shear pin 840 on the anti-seating sealing ring 800. Then, the movable module moves upward together with the movable module, pushing the slip 400 radially out along the tubing body 100, so that the slip 400 is anchored on the inner wall of the casing 900 to achieve the sealing, and ensuring that the movable module and the unlocking ring 600 are locked together, allowing the full-type tubing anchor to switch from the initial state to the sealing state.

[0068] like Figure 5As shown, when the safety-type tubing anchor is unsealed, the tubing body 100 needs to be lifted to cut the unsealing shear pin 630 on the unsealing ring 600, causing the movable module to lose its lock. The lower connector 130 pulls the anti-seating sealing ring 800 upward, while the upper connector 110, which is also lifted, pulls the slip sleeve 300, causing the two outer cones to move away from each other. This allows the slip 400 to reset under the action of the elastic ring 500, switching the safety-type tubing anchor from the seated state to the lifted unsealing state. Specifically, the unsealing load for the lifted unsealing is 80.0 kN.

[0069] like Figure 6 As shown, if the upper slip 400 does not return to its original position and cannot be pulled, the lower tubing body 100 is lowered, and the upper connector 110 is pushed down. At this time, the lower connector 130 drives the movable module to move down as a whole through the anti-seat sealing ring 800, forcibly disengaging the outer cone on the cone 240 from the slip 400. The slip 400 is reset under the elasticity of the elastic ring 500, allowing the safety tubing anchor to switch from the upper unsealing state to the lower unsealing state.

Claims

1. A safety-type tubing anchor, characterized in that, The system includes an oil pipe body (100) that extends vertically and has an oil pipe through hole (101). An inlet hole is also present on the side wall of the oil pipe body (100). An unblocking ring (600) is provided on the oil pipe body (100). A movable module is coaxially fitted on the oil pipe body (100). The movable module can move upward relative to the unblocking ring (600). An anti-seat sealing ring (800) is provided between the movable module and the oil pipe body (100). An anti-seat sealing shear pin (840) is connected between the anti-seat sealing ring (800) and the oil pipe body (100). The outer wall of the oil pipe body (100) and the inner wall of the movable module form an inlet cavity. Several slips (400) are provided on the outside of the tubing body (100). Each slip (400) has two inclined surfaces, which respectively cooperate with the tubing body (100) and the outer cone of the movable module.

2. The safety-type tubing anchor according to claim 1, characterized in that, The oil pipe body (100) includes an upper connector (110), a central pipe (120) and a lower connector (130) that are screwed together from top to bottom. The upper connector (110) and the central pipe (120) are provided with an upper connector sealing ring (111). The liquid inlet is provided on the central pipe (120). The lower connector (130) is provided with a fourth locking tooth (131). The outer cone of the oil pipe body (100) is provided on the upper connector (110) and gradually narrows from top to bottom. The active module includes a hydraulic cylinder assembly (200) and a piston (700). The hydraulic cylinder assembly (200) includes a cone (240), a locking sleeve (230), a hydraulic cylinder body (210), and an unsealing sleeve (220) that are screwed together from top to bottom. The piston (700) is sandwiched between the unsealing sleeve (220) and the central tube (120). The outer cone of the active module is located on the cone (240) and gradually narrows from bottom to top.

3. The safety-type tubing anchor according to claim 2, characterized in that, The liquid inlet includes a first liquid inlet (121) and a second liquid inlet (122), and the liquid inlet cavity includes a first liquid inlet cavity and a second liquid inlet cavity. The first liquid inlet (121) is connected to the first liquid inlet cavity, and the second liquid inlet (122) is connected to the second liquid inlet cavity. The first liquid inlet chamber is surrounded by a central tube (120), a locking sleeve (230), and a cone (240). A first cone sealing ring (241) is provided at the joint between the cone (240) and the central tube (120), a second cone sealing ring (242) is provided at the joint between the cone (240) and the locking sleeve (230), and a first central tube sealing ring is provided at the joint between the central tube (120) and the locking sleeve (230). The second liquid inlet chamber is formed by a central tube (120), a lower connector (130), a piston (700), and a cylinder body (210). A first piston sealing ring (701) is provided at the joint between the piston (700) and the central tube (120), a second piston sealing ring (702) is provided at the joint between the piston (700) and the cylinder body (210), and a lower connector sealing ring is provided at the joint between the lower connector (130) and the cylinder body (210).

4. The safety-type tubing anchor according to claim 3, characterized in that, It also includes a slip sleeve (300), which is coaxially sleeved with the tubing body (100). The cone (240) is fixedly connected to a cone guide pin (243). The upper end of the slip sleeve (300) slides in a vertical direction with the cone guide pin (243). The upper connector (110) is fixedly connected to an upper connector guide pin (112). The lower end of the slip sleeve (300) slides in a vertical direction with the upper connector guide pin (112). The slip (400) is movably connected to the slip sleeve (300). The slip (400) can move radially along the tubing body (100).

5. The safety-type tubing anchor according to claim 4, characterized in that, The slip (400) includes a slip body (410) and several anchor blocks (420) embedded in the slip body (410). The anchor blocks (420) are made of alloy. The end face of the anchor block (420) is set at an angle to the radial direction of the oil pipe body (100). A slip through groove (411) is opened at one end of the slip (400) away from the oil pipe body (100). The slip sleeve (300) is partially embedded in the slip through groove (411).

6. The safety-type tubing anchor according to claim 5, characterized in that, The unlocking ring (600) includes a locking ring body (610) and a locking ring sleeve (620). The locking ring body (610) is sleeved on the oil pipe body (100). The outer ring of the locking ring body (610) is unidirectionally slidably connected to the inner wall of the locking ring sleeve (230). The locking ring sleeve (620) is fixed to one end of the locking ring body (610). An unlocking shear pin (630) is connected between the unlocking ring (600) and the oil pipe body (100). The unlocking shear pin (630) is threadedly connected to the locking ring sleeve (620). One end of the unlocking shear pin (630) passes through the locking ring sleeve (620) and is embedded in the countersunk hole of the central tube (120).

7. The safety-type tubing anchor according to claim 6, characterized in that, It also includes an elastic ring (500), which is sleeved on the tubing body (100) and presses against the bottom of the grooves of the slip grooves (411); The inner wall of the lock sleeve (230) is provided with a first locking tooth (231), and the outer ring of the lock ring body (610) is provided with a second locking tooth. The lock ring body (610) undergoes elastic deformation in the vertical direction under force, and the first locking tooth (231) and the second locking tooth cooperate with each other.

8. The safety-type tubing anchor according to claim 7, characterized in that, The tubing body (100) is fitted with an annular locking ring seat (810). The anti-seat sealing ring (800) includes a locking ring seat (810), an inner locking ring (820), and an outer locking ring (830). The inner locking ring (820) is located on the inner ring of the locking ring seat (810). The inner ring of the inner locking ring (820) is unidirectionally slidably connected to the outer wall of the tubing body (100). The outer locking ring (830) is located on the outer ring of the locking ring seat (810). The outer ring of the outer locking ring (830) is unidirectionally slidably connected to the inner wall of the unsealing sleeve (220). The anti-seat sealing shear pin (840) is threadedly connected to the locking ring seat (810). One end of the anti-seat sealing shear pin (840) passes through the locking ring seat (810) and is embedded in the countersunk hole of the lower connector (130).

9. The safety-type tubing anchor according to claim 8, characterized in that, The inner ring (820) has a third locking tooth on its inner ring and a fourth locking tooth (131) on the outer wall of the lower connector (130). The inner ring (820) undergoes elastic deformation in the vertical direction under force, and the third locking tooth and the fourth locking tooth (131) cooperate with each other.

10. The safety-type tubing anchor according to claim 8, characterized in that, The outer locking ring (830) has a fifth locking tooth on its outer ring, and the inner wall of the unsealing sleeve (220) has a sixth locking tooth (221). The outer locking ring (830) undergoes elastic deformation in the vertical direction under force, and the fifth locking tooth and the sixth locking tooth (221) cooperate with each other.

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