A liner cementing and releasing packer device for sidetracking wells

Abstract

The utility model relates to oil and gas field downhole operation tool technical field, and disclose a kind of tail pipe cementing release packer device for lateral drilling well, including the release mechanism and annular space packer mechanism connected in order from top to bottom, release mechanism includes reverse buckle joint, release variable buckle and central tube;The upper end of reverse buckle joint is fixedly connected with cementing delivery string, the side of reverse buckle joint lower end is connected with the upper end of release variable buckle, the other side of reverse buckle joint lower end is connected with the upper end of central tube;Annular space packer mechanism includes outer tube, fixed cylinder, sealing rubber cylinder, push cylinder, stop ring, setting shear pin, piston and liquid cylinder.The utility model effectively prevents the up channel of formation gas from occurring due to pressure imbalance in cement slurry condensation process, fundamentally solves the gas channeling problem, thereby significantly improves the cementing and sealing quality of lateral drilling well.

Description

Technical Field

[0001] This utility model relates to the field of downhole tools for oil and gas fields, and more specifically, to a tailpipe cementing packer device for sidetracking wells. Background Technology

[0002] In the field of oil and gas extraction, using sidetracking technology to repair old wells and tap into remaining resources is an important measure to maintain stable oilfield production. Sidetracking involves drilling a new wellbore trajectory by creating a window at a specific location in the existing wellbore, in order to develop untapped reservoirs or remaining oil and gas resources.

[0003] However, in sidetracking cementing operations, gas channeling is highly likely to occur due to factors such as small annular space, low cement slurry displacement efficiency, poor cement slurry performance, or hydraulic column pressure lower than formation pressure during construction, severely affecting cementing quality. Currently available sidetracking cementing tools mainly integrate cementing and release / reconnection functions, but generally lack effective gas channeling prevention structures. Furthermore, many tools integrate hanger functions, but in the confined annulus and complex pressure fluctuation environment of sidetracking wells, hangers are prone to mis-adhesion, leading to downhole accidents and significant economic losses.

[0004] Therefore, there is an urgent need for a specialized device that can effectively prevent gas leakage, avoid accidental set-up, and complete cementing, isolation, and release operations in one drilling run. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, this utility model provides a tailpipe cementing release packer device for sidetracking wells, which solves the problem of the lack of an effective anti-gas channeling structure in the existing technology.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: A tailpipe cementing release packer device for sidetracking wells, comprising a release mechanism and an annular packer mechanism connected sequentially from top to bottom. The release mechanism includes a reverse-threaded connector, a release variable-thread, and a central tube. The upper end of the reverse-threaded connector is fixedly connected to the cementing feed string, one side of the lower end of the reverse-threaded connector is connected to the upper end of the release variable-thread, and the other side of the lower end of the reverse-threaded connector is connected to the upper end of the central tube. The annular sealing mechanism includes an outer tube, a fixed cylinder, a sealing rubber tube, a push cylinder, a backstop ring, a setting shear pin, a piston, and a hydraulic cylinder. The upper end of the outer tube is threadedly connected to the lower end of the release buckle. The fixed cylinder is threadedly connected to the top of the outer tube. The sealing rubber tube is fitted onto the outer side of the outer tube, and the upper end of the outer tube contacts and engages with the outer tube. The push cylinder is fitted onto the outer side of the outer tube, and the upper end of the push cylinder contacts and engages with the sealing rubber tube. The backstop ring is fitted onto the outer side of the outer tube and is slidably connected to the outer tube. The piston is fitted onto the outer side of the outer tube, and the upper end of the piston contacts the backstop ring. One side of the top of the piston is threadedly connected to the lower end of the push cylinder. The hydraulic cylinder is threadedly connected to the bottom of the outer tube. The setting shear pin is fixedly connected between the piston and the hydraulic cylinder.

[0007] Preferably, one side of the lower end of the undercut connector is provided with a left-hand thread, and the undercut connector is connected to the release thread via the left-hand thread; the other side of the lower end of the undercut connector is provided with a right-hand thread, and the undercut connector is connected to the center pipe thread via the right-hand thread.

[0008] Preferably, the inner wall of the anti-reverse ring is fixedly connected with a one-way ratchet that slides with the outer wall of the outer tube.

[0009] Preferably, the setting shear pin is perpendicular to the axial direction of the outer tube and passes through the concentric hole of the piston and the hydraulic cylinder.

[0010] Preferably, a cementing sealing mechanism is provided below the annular sealing mechanism, the cementing sealing mechanism including a sealing coupling, a cementing composite shear pin, a hollow rubber plug body, a plurality of hollow rubber plug cups and a self-locking ring; The sealing coupling is threaded to the outside of the central tube. The lower end of the sealing coupling is fixedly connected to the hollow rubber plug body through a cementing composite shear pin. Several hollow rubber plug cups are cured on the outer wall of the hollow rubber plug body by vulcanization. The self-locking ring is fitted onto the lower end of the hollow rubber plug body.

[0011] Preferably, a plurality of vulcanized sealing strips are provided along the outer axial direction of the sealing coupling, and the plurality of vulcanized sealing strips are cured on the outer wall of the sealing coupling by vulcanization.

[0012] Preferably, the lower end of the hollow rubber stopper body is provided with a groove that slides with the self-locking ring, and the self-locking ring can shrink its outer diameter when subjected to radial external force.

[0013] Preferably, the lower end of the hollow rubber stopper body is provided with a necked slope.

[0014] Preferably, the outer tube is a thick-walled tube and has pressure transmission holes.

[0015] The beneficial effects of this utility model are as follows: 1. This utility model, through the integrated hydraulic setting annular sealing mechanism, can actively and mechanically seal the cement annulus immediately after cementing, forming a physical barrier. This effectively prevents formation gas from flowing upwards due to pressure imbalance during cement slurry setting, fundamentally solving the gas flow problem and thus significantly improving the cementing quality of sidetracked wells.

[0016] 2. This utility model innovatively adopts an integral tubing bottom-contact cementing process, completely eliminating the traditional hanger structure. Therefore, during tool entry, drilling, and well flushing, it completely avoids accidental set-in / set-up accidents caused by pressure fluctuations, tool vibration, or improper operation, greatly improving operational safety and reliability, and reducing economic losses caused by downhole accidents.

[0017] 3. This utility model allows for the sequential completion of four key operations—tailpipe running, cementing, annular isolation, and release—in a single drilling run. This simplifies the construction process, shortens the operation time, reduces the complex operational requirements on drilling equipment and personnel, and achieves high-efficiency operation.

[0018] 4. The present invention features a compact structural design, making it particularly suitable for the harsh working conditions of small wellbore and small annulus in side-drilling. The setting process is hydraulically driven, with stable, controllable, and powerful force; combined with a mechanical self-locking mechanism (anti-lock ring and ratchet), it ensures that the setting force is sustained and does not leak, and the sealing performance is reliable. The entire device has strong adaptability and stability under various working conditions.

[0019] 5. By improving cementing success rate, avoiding downhole accidents, and shortening operation cycle, this utility model can effectively reduce the overall cost of sidetracking well renovation, providing an efficient and reliable technical means for stable oil production and tapping remaining oil potential in oilfields, and has significant economic benefits and application and promotion value. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 This is a schematic diagram of the structure of a tailpipe cementing packer device for side-drilling according to the present invention. Figure 2 This is a schematic diagram of the release mechanism of this utility model; Figure 3 This is a schematic diagram of the annular sealing mechanism of this utility model; Figure 4 This is a schematic diagram of the cementing sealing mechanism of this utility model.

[0022] In the diagram: 100, release mechanism; 110, reverse coupling; 120, release changer; 121, left-hand thread; 122, right-hand thread; 130, center tube; 200, annular sealing mechanism; 210, outer tube; 211, pressure transmission hole; 220, fixed cylinder; 230, sealing rubber sleeve; 240, push cylinder; 250, anti-reverse ring; 251, one-way ratchet; 260, setting shear pin; 270, piston; 280, hydraulic cylinder; 300, cementing sealing mechanism; 310, sealing coupling; 311, vulcanized sealing strip; 330, cementing composite shear pin; 340, hollow rubber plug body; 341, hollow rubber plug cup; 342, necking bevel; 343, self-locking ring. Detailed Implementation

[0023] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0024] like Figures 1 to 4 As shown, this utility model provides a tailpipe cementing release packer device for sidetracking wells, including a release mechanism 100 and an annular packer mechanism 200 connected sequentially from top to bottom. The release mechanism 100 includes a reverse coupling 110, a release variable coupling 120, and a central tube 130. The upper end of the reverse coupling 110 is fixedly connected to the cementing feed string, one side of the lower end of the reverse coupling 110 is connected to the upper end of the release variable coupling 120, and the other side of the lower end of the reverse coupling 110 is connected to the upper end of the central tube 130. By connecting the assembled tailpipe string to the cementing feed string via the upper end of the back-locking connector 110 of the release mechanism 100, the string is lowered to the designed position at the bottom of the well. The entire string adopts a bottom-touching process, with the tailpipe shoe supported at the bottom of the well, eliminating the need for a hanger and avoiding the risk of accidental snagging during the process.

[0025] The annular sealing mechanism 200 includes an outer tube 210, a fixed cylinder 220, a sealing rubber sleeve 230, a pusher cylinder 240, a backstop ring 250, a setting shear pin 260, a piston 270, and a hydraulic cylinder 280. The upper end of the outer tube 210 is threadedly connected to the lower end of the release buckle 120. The fixed cylinder 220 is threadedly connected to the top of the outer tube 210. The sealing rubber sleeve 230 is fitted onto the outer side of the outer tube 210, with the upper end of the outer tube 210 in contact with it. The pusher cylinder 240 is fitted onto the outer side of the outer tube 210, with the upper end of the pusher cylinder 240 in contact with the sealing rubber sleeve 230. The backstop ring 250 is fitted onto the outer tube. The outer side of the outer tube 210 is slidably connected to the outer tube 210. The inner wall of the anti-reverse ring 250 is fixedly connected with a one-way ratchet 251 that slides with the outer wall of the outer tube 210. The piston 270 is fitted on the outer side of the outer tube 210 and the upper end of the piston 270 contacts the anti-reverse ring 250. One side of the top of the piston 270 is threadedly connected to the lower end of the push cylinder 240. The hydraulic cylinder 280 is threadedly connected to the bottom end of the outer side of the outer tube 210. The setting shear pin 260 is fixedly connected between the piston 270 and the hydraulic cylinder 280. The setting shear pin 260 is perpendicular to the axial direction of the outer tube 210 and passes through the concentric hole of the piston 270 and the hydraulic cylinder 280.

[0026] By applying pressure from the wellhead into the casing, pressurized fluid enters the sealed chamber formed by the cylinder 280 and piston 270 through the opened pressure transmission port 211. When the pressure reaches the design shear value of the setting shear pin 260, the shear pin is sheared. The released piston 270 moves upward under hydraulic pressure. As the piston 270 moves upward, it sequentially pushes the anti-reverse ring 250 and the pusher 240 upward. The pusher 240 forcefully squeezes the sealing sleeve 230, causing it to expand and deform radially until it tightly fits into the annular space between the sealing sleeve and the tailpipe. The one-way ratchet 251 on the inner wall of the anti-reverse ring 250 engages with the corresponding ratchet on the outer wall of the outer tube 210, allowing it to move upward but locking it to move downward, achieving mechanical self-locking in the setting state and ensuring a long-lasting and reliable sealing effect.

[0027] Furthermore, the outer tube 210 is a thick-walled tube and a pressure transmission hole 211 is provided on the outer tube 210.

[0028] Furthermore, a left-hand thread 121 is provided on one side of the lower end of the reverse connector 110, and the reverse connector 110 is threadedly connected to the release buckle 120 through the left-hand thread 121. A right-hand thread 122 is provided on the other side of the lower end of the reverse connector 110, and the reverse connector 110 is threadedly connected to the center tube 130 through the right-hand thread 122.

[0029] Furthermore, a cementing sealing mechanism 300 is provided below the annular packer mechanism 200. The cementing sealing mechanism 300 includes a sealing coupling 310, a cementing composite shear pin 330, a hollow rubber plug body 340, several hollow rubber plug cups 341, and a self-locking ring 343. The sealing coupling 310 is threaded to the outside of the central tube 130. Several vulcanized sealing strips 311 are provided along the outer axial direction of the sealing coupling 310. The vulcanized sealing strips 311 are cured on the outer wall of the sealing coupling 310 by vulcanization. The lower end of 310 is fixedly connected to the hollow rubber plug body 340 by cementing composite shear pin 330. Several hollow rubber plug cups 341 are cured on the outer wall of the hollow rubber plug body 340 by vulcanization. The lower end of the hollow rubber plug body 340 is provided with a necked bevel 342. The lower end of the hollow rubber plug body 340 is provided with a groove (not shown in the figure) that slides with the self-locking ring 343. The self-locking ring 343 can shrink its outer diameter when subjected to radial external force. The self-locking ring 343 is fitted onto the lower end of the hollow rubber plug body 340.

[0030] Working principle: During cementing operations, cement slurry is injected into the pipe, followed by the insertion of a cementing plug for displacement. When the cementing plug descends to the cementing sealing mechanism 300, it is blocked by the necked bevel 342 at the lower end of the hollow plug body 340. Pressurization continues, and when the pressure reaches the design value, the cementing composite shear pin 330 is sheared. The hollow plug body 340, along with its cup 341 and self-locking ring 343, descends under the push of the plug, displacing the cement slurry to the bottom of the well and completing the cementing process.

[0031] After the displacement and pressure are applied, the right-hand (forward) cementing string is driven in approximately 15 turns. The torque is transmitted through the reverse thread connector 110 to the left-hand thread 121 that connects to the release thread 120. Since it is a left-hand thread, it can be reversed by rotating it forward. At the same time, the center tube 130, the sealing coupling 310, and the vulcanized sealing strip 311 rotate together with the tubing string.

[0032] After being inverted, the tube column is lifted, which drives the central tube 130 and the sealing coupling 310 to move upward, so that the vulcanized sealing strip 311 moves from below the pressure transmission hole 211 of the outer tube 210 to above, thereby opening the pressure transmission channel.

[0033] Pressurized fluid is introduced into the pipe from the wellhead, entering the sealed chamber formed by the cylinder 280 and piston 270 through the pressure transmission hole 211. When the pressure reaches the design shear value of the setting shear pin 260, the shear pin is sheared, and the pressure pushes the piston 270 upward. The piston 270 pushes the anti-reverse ring 250 and the pusher 240 upward, and the pusher 240 squeezes the sealing sleeve 230, causing it to expand and deform, sealing the annulus between the sleeve and the tailpipe. The one-way teeth inside the anti-reverse ring 250 engage with the ratchet teeth 251 on the outer wall of the outer sleeve 210 to prevent retraction and achieve permanent setting.

[0034] After the wellhead is set, continue to lift the wellhead tubing string to remove the release mechanism 100, the central tube 130, and the upper part of the cementing sealing mechanism 300 (sealing coupling 310, vulcanized sealing strip 311) from the wellhead, completing the release operation and leaving the sealed tailpipe string at the bottom of the well.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tailpipe cementing release packer device for sidetracking wells, comprising a release mechanism (100) and an annular packer mechanism (200) connected sequentially from top to bottom, characterized in that: The release mechanism (100) includes a reverse coupling (110), a release adapter (120), and a central tube (130); the upper end of the reverse coupling (110) is fixedly connected to the cementing insertion string, one side of the lower end of the reverse coupling (110) is connected to the upper end of the release adapter (120), and the other side of the lower end of the reverse coupling (110) is connected to the upper end of the central tube (130); The annular sealing mechanism (200) includes an outer tube (210), a fixed cylinder (220), a sealing rubber cylinder (230), a push cylinder (240), a backstop ring (250), a setting shear pin (260), a piston (270), and a hydraulic cylinder (280); the upper end of the outer tube (210) is threadedly connected to the lower end of the release buckle (120), the fixed cylinder (220) is threadedly connected to the top of the outer tube (210), the sealing rubber cylinder (230) is fitted onto the outer side of the outer tube (210) and the upper end of the outer tube (210) is in contact with the outer tube (210), and the push cylinder (240) is fitted onto the outer tube (210). The outer side of the outer tube (210) and the upper end of the push cylinder (240) are in contact with the sealing rubber cylinder (230). The anti-reverse ring (250) is fitted on the outer side of the outer tube (210) and is slidably connected to the outer tube (210). The piston (270) is fitted on the outer side of the outer tube (210) and the upper end of the piston (270) is in contact with the anti-reverse ring (250). One side of the top of the piston (270) is threadedly connected to the lower end of the push cylinder (240). The hydraulic cylinder (280) is threadedly connected to the bottom end of the outer side of the outer tube (210). The setting shear pin (260) is fixedly connected between the piston (270) and the hydraulic cylinder (280).

2. The tailpipe cementing release packer device for sidetracking wells according to claim 1, characterized in that: The undercut connector (110) has a left-hand thread (121) on one side of its lower end, and the undercut connector (110) is threaded to the release buckle (120) through the left-hand thread (121). The undercut connector (110) has a right-hand thread (122) on the other side of its lower end, and the undercut connector (110) is threaded to the center tube (130) through the right-hand thread (122).

3. A tailpipe cementing release packer device for sidetracking wells according to claim 1, characterized in that: The inner wall of the anti-reverse ring (250) is fixedly connected with a one-way ratchet (251) that slides with the outer wall of the outer tube (210).

4. A tailpipe cementing release packer device for sidetracking wells according to claim 1, characterized in that: The setting shear pin (260) is perpendicular to the axial direction of the outer tube (210) and passes through the concentric hole of the piston (270) and the hydraulic cylinder (280).

5. A tailpipe cementing release packer device for sidetracking wells according to claim 1, characterized in that: Below the annular sealing mechanism (200) is a cementing sealing mechanism (300), which includes a sealing coupling (310), a cementing composite shear pin (330), a hollow rubber plug body (340), a plurality of hollow rubber plug cups (341) and a self-locking ring (343). The sealing coupling (310) is threaded to the outside of the central tube (130). The lower end of the sealing coupling (310) is fixedly connected to the hollow rubber plug body (340) by a cementing composite shear pin (330). Several hollow rubber plug cups (341) are cured on the outer wall of the hollow rubber plug body (340) by vulcanization. The self-locking ring (343) is fitted onto the lower end of the hollow rubber plug body (340).

6. A tailpipe cementing release packer device for sidetracking wells according to claim 5, characterized in that: The sealing coupling (310) is provided with a plurality of vulcanized sealing strips (311) along its outer axial direction, and the plurality of vulcanized sealing strips (311) are cured on the outer wall of the sealing coupling (310) by vulcanization.

7. A tailpipe cementing release packer device for sidetracking wells according to claim 6, characterized in that: The lower end of the hollow rubber stopper body (340) is provided with a groove that slides with the self-locking ring (343), and the self-locking ring (343) can shrink its outer diameter when subjected to radial external force.

8. A tailpipe cementing release packer device for sidetracking wells according to claim 6, characterized in that: The lower end of the hollow rubber stopper body (340) is provided with a necked bevel (342).

9. A tailpipe cementing release packer device for sidetracking wells according to claim 1, characterized in that: The outer tube (210) is a thick-walled tube and a pressure transmission hole (211) is provided on the outer tube (210).

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