Emergency release sub for sidetracking well

Abstract

The invention relates to the technical field of oil and gas drilling, in particular to a sidetracking well emergency release sub which comprises an upper sub body, a lower sub body, a center pipe, a limiting elastic piece and a locking block. A first limiting ring table and a second limiting ring table are fixed on the inner side of the lower portion of the lower connector corresponding to the position below the upper connector in a vertically spaced mode. The lower end of the first limiting ring table, the upper end of the second limiting ring table and the inner wall of the lower connector form a limiting ring groove. The releasing device is reasonable and compact in structure and convenient to use, releasing can be achieved through ball throwing and pressing when the complexity cannot be relieved through a conventional means when the sidetracking well gets stuck, a drilling tool above the releasing connector and an expensive directional tool can be lifted out of a well opening in time, the complexity can be relieved and a well shaft can be restored to be unblocked only by fishing the drilling tool at the lowest end and a drill bit, and the drilling efficiency is improved. The accident complexity is greatly reduced, the complex treatment time is shortened, the construction cost is saved, and meanwhile the well control risk is reduced to the minimum.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas drilling, in particular to an emergency drop joint for side drilling. Background Art

[0002] With the progress of oil and gas field exploration and development in my country, most oil fields have entered a new stage of tapping the production capacity of old oil fields after the implementation of various measures. For accident wells such as casing damage, bottom debris, and local formation depletion wells, conventional well repair measures can no longer restore the production capacity of oil and gas wells. Special tools and processes can be used to implement casing window directional drilling to oil and gas enrichment areas, so as to maximize the use of existing conditions and realize the potential of old areas and increase efficiency, and improve the ultimate recovery rate of oil and gas reservoirs. With the continuous maturity of technology, window side drilling has become one of the important means of increasing reserves and production in oil fields.

[0003] Sidetracking is the process of drilling through windows in the original casing of an oil and gas well. The maximum size of the drill bit used is smaller than the inner diameter of the casing, so the borehole trajectory is smaller than that of conventional drilling. This results in the limitation of the size of drilling tools such as drill bits, drill pipes, and screws in sidetracking, and the inability to withstand torque, lifting force, and pump pressure. It is very easy for drill bits to get stuck or drill tools to break during high-speed drilling. When an accident occurs, thousands of meters of drill tools will be stranded in the formation, requiring a lot of time and complicated processing. If the jam cannot be released in time, the properties of the drilling fluid will continue to change, and the probability of the drill tool being buried due to formation collapse will continue to increase, further leading to complicated accidents. There is an urgent need for a tool that can be quickly released when a sidetrack encounters complexity, greatly reducing the time for complex processing and reducing well control risks. Summary of the invention

[0004] The present invention provides an emergency release joint for side drilling wells, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problems of long processing time and high well control risk in the existing side drilling wells when they are complicated.

[0005] The technical scheme of the present invention is achieved through the following measures: a side drilling emergency release joint, comprising an upper joint, a lower joint, a center pipe, a limiting spring piece and a locking block. The outer side of the lower part of the upper joint and the inner side of the upper part of the lower joint are sealed together, and a first limiting ring platform and a second limiting ring platform are fixed at intervals on the lower and upper sides of the inner side of the lower part of the lower joint corresponding to the position below the upper joint. The lower end of the first limiting ring platform, the upper end of the second limiting ring platform and the inner wall of the lower joint form a limiting ring groove. A plurality of limiting spring pieces are evenly distributed along the circumference of the lower end of the upper joint, and a locking block located in the limiting ring groove and in contact with the lower end of the first limiting ring platform on the upper side is fixed on the outer side of the lower end of each limiting spring piece. The inner side of the lower part of the upper joint is sealed with a center pipe, and a stop ring is detachably fixed on the outer side of the lower end of the center pipe, and the outer side of the lower end is in sealing contact with the inner side of the second limiting ring platform, and the outer side of the stop ring is against the inner side of each limiting spring piece.

[0006] The following are further optimizations and / or improvements to the above technical solutions: The outer side of the upper part of the above-mentioned center tube may be provided with a plurality of limit grooves at intervals along the circumference, and a radially penetrating limit screw hole is provided on the outer side of the upper joint corresponding to each limit groove position, and a first shear nail with an end located in the corresponding limit groove is screwed in each limit screw hole, and at least one first sealing ring groove is provided at intervals in the upper and lower parts of the outer side of the center tube corresponding to the position above the first shear nail, and a first sealing ring is installed in each first sealing ring groove.

[0007] A third limiting ring platform may be fixed to the inner side of the lower part of the lower joint corresponding to the lower end of the second limiting ring platform, and the inner diameters of the third limiting ring platform, the second limiting ring platform and the first limiting ring platform become smaller in sequence.

[0008] A fourth limiting ring platform can be fixed on the outer side of the middle part of the upper joint corresponding to the upper end position of the lower joint, and a plurality of second sealing ring grooves are provided at intervals above and below the outer side of the upper joint corresponding to the position between the first shear nail and the fourth limiting ring platform, and a second sealing ring is installed in each second sealing ring groove, and the outer side of the upper joint and the inner side of the lower joint corresponding to the position below the first shear nail are tightly fitted together.

[0009] As a preference, a sealing ring platform may be fixed on the outer side of the upper end of the above-mentioned central tube, the first sealing ring groove and the limit groove are arranged at upper and lower intervals on the outer side of the lower part of the sealing ring platform, and a fifth limit ring platform is fixed on the inner side of the lower end of the upper joint corresponding to the position below the sealing ring platform.

[0010] As another preferred embodiment, the above may also include a hanging drill collar, a ball seat and a second shear nail. A first limiting step surface is provided on the inner side of the upper part of the upper joint. A sixth limiting ring is fixed on the outer side of the center tube corresponding to the position above the first limiting step surface, which is in sealing contact with the inner side of the upper joint. A tubular hanging drill collar is sealingly fixed on the inner side of the upper part of the upper joint corresponding to the position above the sixth limiting ring. The inner side of the lower part of the hanging drill collar is in sealing contact with the outer side of the upper part of the center tube. A ball seat with a tubular structure is installed on the inner side of the upper part of the hanging drill collar. A fixing groove is provided on the outer side of the lower part of the ball seat. A fixing hole connected inside and outside is provided on the outer side of the hanging drill collar corresponding to the position of the fixing groove. A second shear nail with its end located in the fixing groove is fixed in the fixing hole. A liquid passage with its lower end extending to the lower end of the hanging drill collar is provided on the inner wall of the upper part of the hanging drill collar corresponding to the position above the second shear nail.

[0011] The outer side of the lower part of the above-mentioned hanging drill collar can be provided with an outer step surface, the inner side of the lower part of the hanging drill collar is provided with an inner step surface, the upper end of the upper joint is in contact with the outer step surface, the inner side of the upper end of the upper joint is sealed and screwed together with the inner side of the lower part of the hanging drill collar, the upper end of the center tube is in contact with the inner step surface, at least one third sealing ring is provided between the outer side of the center tube and the inner side of the lower part of the hanging drill collar, the liquid passage includes a first connecting hole, a second connecting hole, a third connecting hole and a fourth connecting hole, and a radially penetrating first connecting hole is provided on the inner side of the hanging drill collar corresponding to the position above the second shear nail A second connecting hole is provided on the outer step surface of the hanging drill collar, and the upper end is connected with the first connecting hole. A third connecting hole is provided at the lower end of the hanging joint, the lower end of which opens downward and the upper end of which is located above the outer step surface. A fourth connecting hole is provided on the outer side of the lower part of the hanging drill collar, and the fourth connecting hole is connected with the third connecting hole and the second connecting hole. A first blocking wire is sealed and fixedly installed in the first connecting hole corresponding to the position between the second connecting hole and the outer side of the hanging drill collar, and a second blocking wire is sealed and fixedly installed in the fourth connecting hole corresponding to the position between the second connecting hole and the outer side of the hanging drill collar.

[0012] The inner side of the ball seat may be provided with a first straight hole, a tapered hole and a second straight hole connected in sequence from top to bottom, the inner diameter of the first straight hole is larger than the inner diameter of the second straight hole, at least one fourth sealing ring is provided between the outer side of the ball seat corresponding to the position below the second shear nail and the inner side of the hanging drill collar at an upper and lower interval, and at least one fifth sealing ring is provided between the outer side of the ball seat corresponding to the position above the first connecting hole and the inner side of the hanging drill collar at an upper and lower interval.

[0013] A second limiting step surface may be provided on the inner side of the suspension drill collar corresponding to the position below the ball seat.

[0014] The lower end surface of the first limiting ring platform can be inclined from top to bottom and from inside to outside, and the upper side surface of the locking block matches the lower end surface of the first limiting ring platform.

[0015] The outer side of the upper end of the stop ring and the inner side of the upper end of the center tube may be provided with chamfers.

[0016] The invention has a reasonable and compact structure and is easy to use. When a drill bit is stuck in a side drilling well and conventional means cannot release the stuck drill bit, the drill bit can be released by dropping a ball to suppress the stuck drill bit, so that the drill tools above the release joint and the expensive directional tools can be promptly lifted out of the wellhead. Only the lowermost drill tools and the drill bit need to be salvaged to release the stuck drill bit and restore the wellbore to normal operation, which greatly reduces the complexity of the accident, shortens the time for handling the stuck drill bit, saves the construction cost, and reduces the well control risk to a minimum. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 It is a schematic diagram of the front cross-sectional structure of the first embodiment.

[0018] Attached Figure 2 It is a schematic diagram of the front cross-sectional structure of the upper half of the sixth embodiment.

[0019] Attached Figure 3 It is a schematic diagram of the front cross-sectional structure of the lower half of the sixth embodiment.

[0020] The codes in the accompanying drawings are: 1 is an upper joint, 2 is a lower joint, 3 is a center tube, 4 is a limiting spring piece, 5 is a locking block, 6 is a stop ring, 7 is a first limiting ring platform, 8 is a second limiting ring platform, 9 is a limiting ring groove, 10 is a sealing ring platform, 11 is a first sealing ring, 12 is a first shear nail, 13 is a third limiting ring platform, 14 is a fourth limiting ring platform, 15 is a second sealing ring, 16 is a fifth limiting ring platform, 17 is a suspension drill collar, 18 is a ball seat, 19 is a first Two shear nails, 20 is the first limiting step surface, 21 is the sixth limiting ring platform, 22 is the outer step surface, 23 is the inner step surface, 24 is the first connecting hole, 25 is the second connecting hole, 26 is the third connecting hole, 27 is the fourth connecting hole, 28 is the first blocking wire, 29 is the second blocking wire, 30 is the first straight hole, 31 is the tapered hole, 32 is the second straight hole, 33 is the third sealing ring, 34 is the fourth sealing ring, 35 is the fifth sealing ring, and 36 is the second limiting step surface. DETAILED DESCRIPTION

[0021] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0022] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0023] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As shown in the attached Figure 1 As shown, the side drilling emergency release joint includes an upper joint 1, a lower joint 2, a center pipe 3, a limiting spring piece 4 and a locking block 5. The outer side of the lower part of the upper joint 1 and the inner side of the upper part of the lower joint 2 are sealed together. The first limiting ring platform 7 and the second limiting ring platform 8 are fixed at intervals on the lower and upper sides of the inner side of the lower part of the lower joint 2 corresponding to the position below the upper joint 1. The lower end of the first limiting ring platform 7, the upper end of the second limiting ring platform 8 and the inner wall of the lower joint 2 form a limiting ring groove 9. A plurality of limiting spring pieces 4 are evenly distributed along the circumference of the lower end of the upper joint 1. The outer side of the lower end of each limiting spring piece 4 is fixed with a locking block 5 located in the limiting ring groove 9 and in contact with the lower end of the first limiting ring platform 7 on the upper side. The inner side of the lower part of the upper joint 1 is sealed with a center pipe 3. The outer side of the lower end of the center pipe 3 is detachably fixed with a stop ring 6 whose outer side of the lower end is in sealing contact with the inner side of the second limiting ring platform 8. The outer side of the stop ring 6 abuts against the inner side of each limiting spring piece 4.

[0024] According to the requirements, the inner side of the stop ring 6 is threadedly connected to the outer side of the lower end of the center tube 3, at least one sealing ring is provided at upper and lower intervals on the outer side of the stop ring 6, and a number of radially penetrating disassembly and assembly grooves are evenly distributed along the circumference of the lower end of the stop ring 6 to facilitate the disassembly and assembly between the stop ring 6 and the center tube 3. The sum of the thickness of the locking block 5 and the thickness of the limiting spring piece 4 is smaller than the difference between the inner annular radius of the first limiting ring platform 7 and the outer radius of the center tube 3, and the locking block 5 and the limiting spring piece 4 are integrally arranged.

[0025] When in use, the upper part of the upper joint 1 is connected to the pipe column, and the inner side of the stop ring 6 is connected to the directional tool. Under normal working conditions, the interior of the central pipe 3 is connected from top to bottom, and normal circulation and continuous drilling can be carried out. The locking block 5 at the end of the limiting spring piece 4 is located in the limiting ring groove 9 under the action of the stop ring 6, the first limiting ring platform 7 and the second limiting ring platform 8, and is in a self-locking state.

[0026] When the drilling process encounters unknown complexity and cannot be unstuck by conventional means, a steel ball is thrown in to perform the release operation: the steel ball falls on the upper end of the center tube 3 and seals the inner side of the center tube 3. Then the high pressure generated by the mud pump acts on the steel ball. After the steel ball acts on the upper end of the center tube 3, it pushes the center tube 3 to move downward. At the same time, the stop ring 6 moves downward with the center tube 3 in the second limit ring platform 8. When the stop ring 6 moves to below the locking block 5, the lower ends of the limit spring pieces 4 move inwardly to each other, so that the locking block 5 and the limit ring groove 9 are separated from each other, and the release is completed.

[0027] After the mud pump is released, the normal pressure is restored, and the pipe column connected to the upper joint 1 is lifted up. The locking block 5 and the limiting spring piece 4 can move upward between the outer side of the central pipe 3 and the inner side of the first limiting ring platform 7, thereby lifting the upper joint 1, the central pipe 3 and the orienting tool whose upper end is suspended on the inner side of the stop ring 6.

[0028] When a drill bit is stuck in a side drilling well and conventional means cannot be used to release the stuck drill bit, the present invention can release the stuck drill bit by throwing a ball to suppress the stuck drill bit, so that the drilling tools above the release joint and the expensive directional tools can be promptly lifted out of the wellhead. Only the lowermost drilling tools and drill bits need to be salvaged to release the stuck drill bit and restore the wellbore to normal operation, which greatly reduces the complexity of the accident, shortens the time for handling the stuck drill bit, saves the construction cost, and reduces the well control risk to a minimum.

[0029] The above-mentioned side drilling well emergency release joint can be further optimized and / or improved according to actual needs: Embodiment 2: As an optimization of the above embodiment, as shown in the attached Figure 1As shown, a plurality of limit grooves are distributed along the circumferential interval on the outer side of the upper part of the center tube 3, and a radially penetrating limit screw hole is provided on the outer side of the upper joint 1 corresponding to each limit groove position, and a first shear nail 12 with an end located in the corresponding limit groove is screwed in each limit screw hole, and at least one first sealing ring groove is provided at intervals from top to bottom on the outer side of the center tube 3 corresponding to the position above the first shear nail 12, and a first sealing ring 11 is installed in each first sealing ring groove.

[0030] During use, after the first shear nail 12 is cut off, the directional tool installed at the bottom of the central tube 3 can be lifted by lifting the upper joint 1. By setting the first sealing ring 11, the sealing between the outer side of the upper end of the central tube 3 and the inner side of the upper joint 1 can be improved. When the drilling process encounters unknown complexity and cannot be unstuck by conventional means, the first shear nail 12 can be quickly cut off after the steel ball is inserted, and the hands-free operation can be quickly completed, thereby improving work efficiency.

[0031] Embodiment 3: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, a third limiting ring platform 13 is fixed to the inner side of the lower part of the lower joint 2 corresponding to the lower end position of the second limiting ring platform 8, and the inner diameters of the third limiting ring platform 13, the second limiting ring platform 8 and the first limiting ring platform 7 become smaller in sequence.

[0032] According to the requirements, the inner side of the upper end of the third limiting ring platform 13 and the inner side of the lower end of the second limiting ring platform 8 are inclined and transitioned. During use, by setting the third limiting ring platform 13, when the central tube 3 moves downward, the third limiting ring platform 13 can limit the stop ring 6 to avoid the central tube 3 moving downward too far and causing a malfunction.

[0033] Embodiment 4: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, a fourth limiting ring platform 14 is fixed to the outer side of the middle part of the upper joint 1 corresponding to the upper end position of the lower joint 2, and a plurality of second sealing ring grooves are provided at intervals above and below the outer side of the upper joint 1 corresponding to the position between the first shear nail 12 and the fourth limiting ring platform 14, and a second sealing ring 15 is installed in each second sealing ring groove, and the outer side of the upper joint 1 and the inner side of the lower joint 2 corresponding to the position below the first shear nail 12 are tightly fitted together.

[0034] According to the requirements, the outer side of the upper joint 1 and the inner side of the lower joint 2 corresponding to the position below the first shear nail 12 are tightly sheathed together through the existing known sealing paper, which can reduce the tension of the limiting spring piece 4 and prevent the limiting spring piece 4 from deformation. During use, by setting the fourth limiting ring platform 14, it is convenient to limit the locking block 5 when installing the upper joint 1 and the lower joint 2, so that the locking block 5 can be accurately installed in the limiting ring groove 9. By setting the second sealing ring 15, it can not only improve the sealing performance between the upper joint 1 and the lower joint 2, but also facilitate the upper joint 1 and the lower joint 2 to be separated from each other after the steel ball is put into the upper joint 1. The upper joint 1 can be lifted to lift the orientation tool installed at the bottom of the center pipe 3.

[0035] Embodiment 5: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, a sealing ring 10 is fixed to the outer side of the upper end of the center tube 3, a first sealing ring groove and a limit groove are arranged at intervals on the outer side of the lower part of the sealing ring 10, and a fifth limit ring 16 is fixed to the inner side of the lower end of the upper joint 1 corresponding to the position below the sealing ring 10.

[0036] According to the requirements, the number of the first sealing ring groove is one. During use, by setting the fifth limiting ring platform 16, when the first shear nail 12 is cut off and the upper joint 1 is lifted up, the fifth limiting ring platform 16 can support the sealing ring platform 10, so that the directional tool installed at the bottom of the central pipe 3 can be lifted up by lifting the upper joint 1. By setting the first sealing ring 11, the sealing performance between the outer side of the upper end of the central pipe 3 and the inner side of the upper joint 1 can be improved. When the drilling process encounters unknown complexity and cannot be unstuck by conventional means, the first shear nail 12 can be quickly cut off after the steel ball is inserted, and the release operation can be quickly completed, thereby improving work efficiency.

[0037] The usage process of this embodiment: Under normal working conditions, the interior of the center tube 3 is connected from top to bottom, and normal circulation and continuous drilling can be carried out. The locking block 5 at the end of the limiting spring piece 4 is located in the limiting ring groove 9 under the action of the stop ring 6, the first limiting ring platform 7 and the second limiting ring platform 8, and is in a self-locking state.

[0038] When the drilling process encounters unknown complexity and cannot be unstuck by conventional means, a steel ball is thrown in to perform the release operation: the steel ball falls on the upper end of the center tube 3 and seals the inner side of the center tube 3. Then the high pressure generated by the mud pump acts on the steel ball. After the steel ball acts on the upper end of the center tube 3, it cuts off the first shear nail 12, and then pushes the center tube 3 to move downward and falls on the upper end of the fifth limit ring platform 16 on the inner side of the lower part of the upper joint 1. At the same time, the stop ring 6 moves downward with the center tube 3 in the second limit ring platform 8. When the stop ring 6 moves to below the locking block 5, the lower ends of the limit spring pieces 4 move inwardly to each other, so that the locking block 5 and the limit ring groove 9 are separated from each other, and the release is completed.

[0039] After the mud pump is released, the normal pressure is restored, and the pipe column connected to the upper joint 1 is lifted up. The locking block 5 and the limiting spring piece 4 can move upward between the outer side of the central pipe 3 and the inner side of the first limiting ring platform 7, thereby lifting up the upper joint 1, the central pipe 3 and the directional tool such as MWD (wireless measurement while drilling) whose upper end is suspended on the inner side of the stop ring 6.

[0040] Embodiment 6: As an optimization of embodiment 3, as shown in the attached Figure 2 , 3 As shown, it also includes a hanging drill collar 17, a ball seat 18 and a second shear nail 19. A first limiting step surface 20 is provided on the inner side of the upper part of the upper joint 1. A sixth limiting ring platform 21 that is in sealing contact with the inner side of the upper joint 1 is fixed on the outer side of the center pipe 3 corresponding to the position above the first limiting step surface 20. A tubular hanging drill collar 17 is sealed and fixedly installed on the inner side of the upper part of the upper joint 1 corresponding to the position above the sixth limiting ring platform 21. The inner side of the lower part of the hanging drill collar 17 is in sealing contact with the outer side of the upper part of the center pipe 3. A ball seat 18 of a tubular structure is installed on the inner side of the upper part of the hanging drill collar 17. A fixing groove is provided on the outer side of the lower part of the ball seat 18. A fixing hole connected inside and outside is provided on the outer side of the hanging drill collar 17 corresponding to the position of the fixing groove. A second shear nail 19 with an end located in the fixing groove is fixedly installed in the fixing hole. A liquid passage with a lower end extending to the lower end of the hanging drill collar 17 is provided on the inner wall of the upper part of the hanging drill collar 17 corresponding to the position above the second shear nail 19.

[0041] During use, under normal working conditions, normal circulation can be carried out without affecting drilling. The MWD (wireless measurement while drilling) is installed in the suspended drill collar 17. When the drilling process encounters unknown complexity and cannot be unstuck by conventional means, a steel ball is put in to perform the release operation. The steel ball falls on the ball seat 18 to form a closed structure. At this time, the on-site mud pump works normally to form a local high pressure, which pushes the ball seat 18 to move downward, and then cuts off the second shear nail 19. After the ball seat 18 falls, the liquid passage is opened, and the liquid passage enters the mud, and forms a high pressure to push the sixth limit ring 21 and the center pipe 3. The first shear nail 12 is cut off under the thrust, and then the center pipe 3 is pushed downward and falls on the upper end of the sixth limit ring 21 on the inner side of the lower part of the upper joint 1. At the same time, the stop ring 6 moves downward with the center pipe 3 in the second limit ring 8. When the stop ring 6 moves to the bottom of the lock block 5, the lower ends of the limit springs 4 move inward to each other, so that the lock block 5 and the limit ring groove 9 are separated from each other, and the release is completed.

[0042] After the mud pump is released, the normal pressure is restored, and the pipe column connected to the suspended drill collar 17 is lifted up. The locking block 5 and the limiting spring piece 4 can move upward between the outer side of the central pipe 3 and the inner side of the first limiting ring platform 7, thereby lifting the upper joint 1, the central pipe 3 and the directional tool installed on the inner side of the suspended drill collar 17, such as the MWD (wireless measurement while drilling).

[0043] Through such an arrangement, directional tools of various specifications can be installed in the hanging drill collar 17 below the ball seat 18. The hanging drill collar 17 can provide installation space for the directional tools, so that after the drill collar 17 is released, the positioning tool is always located in the hanging drill collar 17, thereby avoiding damage due to wear between the positioning tool and the well wall after the hanging drill collar 17 is lifted up, thereby improving the protection performance of the directional instrument during use.

[0044] Embodiment 7: As an optimization of the above embodiment, as shown in the attached Figure 2 , 3 As shown, an outer step surface 22 is provided on the outer side of the lower part of the suspension drill collar 17, an inner step surface 23 is provided on the inner side of the lower part of the suspension drill collar 17, the upper end of the upper joint 1 is in contact with the outer step surface 22, the inner side of the upper end of the upper joint 1 is sealed and screwed together with the inner side of the lower part of the suspension drill collar 17, the upper end of the center tube 3 is in contact with the inner step surface 23, at least one third sealing ring 33 is provided between the outer side of the center tube 3 and the inner side of the lower part of the suspension drill collar 17, the liquid passage includes a first connecting hole 24, a second connecting hole 25, a third connecting hole 26 and a fourth connecting hole 27, and a radially penetrating first connecting hole 24 is provided on the inner side of the suspension drill collar 17 corresponding to the position above the second shear nail 19, A second connecting hole 25 is provided on the outer step surface 22 of the hanging drill collar 17, and the upper end is connected to the first connecting hole 24. A third connecting hole 26 is provided at the lower end of the hanging joint, and the upper end is located above the outer step surface 22. A fourth connecting hole 27 is provided on the outer side of the lower part of the hanging drill collar 17, and the fourth connecting hole 27 is connected to the third connecting hole 26 and the second connecting hole 25. A first blocking wire 28 is sealed and fixedly installed in the first connecting hole 24 corresponding to the position between the second connecting hole 25 and the outer side of the hanging drill collar 17, and a second blocking wire 29 is sealed and fixedly installed in the fourth connecting hole 27 corresponding to the position between the second connecting hole 25 and the outer side of the hanging drill collar 17.

[0045] During use, the liquid passage includes the first connecting hole 24, the second connecting hole 25, the third connecting hole 26 and the fourth connecting hole 27, which are convenient for the processing and manufacturing of the liquid passage. Through such a setting, the sealing performance between the inner side of the hanging drill collar 17 and the outer side of the upper end of the central tube 3 and the outer side of the hanging drill collar 17 and the inner side of the upper joint 1 can be improved. When the hand-dropping operation is performed, after the steel ball is put in, the mud acts on the steel ball and the ball seat 18, so that the second shear nail 19 is cut off, and then the ball seat 18 is pushed downward. When the upper end of the ball seat 18 is located below the first connecting hole 24, the mud passes through After passing through the liquid channel, the mud flows into the closed annulus formed by the lower end of the hanging drill collar 17, the outer side of the center pipe 3, the upper end of the sixth limit ring 21 and the inner side of the upper joint 1. The mud acts on the sixth limit ring 21, thereby cutting the first shear nail 12, and then pushing the center pipe 3 to move downward and fall on the upper end of the sixth limit ring 21 on the inner side of the lower part of the upper joint 1. At the same time, the stop ring 6 moves downward with the center pipe 3 in the second limit ring 8. When the stop ring 6 moves to below the locking block 5, the lower ends of the limit spring pieces 4 move inwardly to each other, so that the locking block 5 and the limit ring groove 9 are separated from each other, completing the release.

[0046] After the mud pump is released, the normal pressure is restored, and the pipe column connected to the suspended drill collar 17 is lifted up. The locking block 5 and the limiting spring piece 4 can move upward between the outer side of the central pipe 3 and the inner side of the first limiting ring platform 7, thereby lifting the upper joint 1, the central pipe 3 and the directional tool installed on the inner side of the suspended drill collar 17, such as the MWD (wireless measurement while drilling).

[0047] Embodiment 8: As an optimization of the above embodiment, as shown in the attached Figure 2 As shown, the inner side of the ball seat 18 is provided with a first straight hole 30, a tapered hole 31 and a second straight hole 32 which are connected in sequence from top to bottom, the inner diameter of the first straight hole 30 is larger than the inner diameter of the second straight hole 32, at least one fourth sealing ring 34 is arranged between the outer side of the ball seat 18 corresponding to the position below the second shear pin 19 and the inner side of the suspension drill collar 17, and at least one fifth sealing ring 35 is arranged between the outer side of the ball seat 18 corresponding to the position above the first connecting hole 24 and the inner side of the suspension drill collar 17. According to the requirements, the tapered hole 31 is tapered with a large top and a small bottom.

[0048] During use, through such an arrangement, when performing a hand-throwing operation, after the steel ball is thrown in, it can fall into the tapered hole 31, thereby improving the sealing performance of the steel ball on the ball seat 18, thereby facilitating the shearing of the second shear nail 19.

[0049] Embodiment 9: As an optimization of the above embodiment, as shown in the attached Figure 2 As shown, a second limiting step surface 36 is provided on the inner side of the suspension drill collar 17 corresponding to the position below the ball seat 18 .

[0050] During use, through such a setting, after the steel ball is thrown in, the steel ball drives the ball seat 18 to move downward and then falls on the second limiting step surface 36, so that the liquid passage is opened. The setting of the second limiting step surface 36 can allow all the mud to flow into the liquid passage, thereby acting on the sixth limiting ring platform 21, so that the first shear nail 12 can be quickly cut off, thereby improving the efficiency of releasing.

[0051] Embodiment 10: As an optimization of the above embodiment, as shown in the attached Figure 3 As shown, the lower end surface of the first limiting ring platform 7 is inclined from top to bottom and from inside to outside, and the upper side surface of the locking block 5 matches the lower end surface of the first limiting ring platform 7.

[0052] During use, through such an arrangement, when the center tube 3 drives the stop ring 6 to move downward to below the locking block 5, the lower end of the limiting spring piece 4 drives the locking block 5 to swing inward and then reset, so that the locking block 5 and the limiting ring groove 9 are smoothly separated. At the same time, after lifting the upper joint 1, it can also avoid the locking block 5 and the first limiting ring platform 7 from scratching, which makes the upper joint 1 unable to be lifted smoothly.

[0053] Embodiment 11: As an optimization of the above embodiment, as shown in the attached Figure 3 As shown, the outer side of the upper end of the stop ring 6 and the inner side of the upper end of the center tube 3 are both chamfered.

[0054] During use, a chamfer is provided on the outer side of the upper end of the stop ring 6 to facilitate the insertion of the stop ring 6 into the limiting spring sheet 4 and installation together with the outer side of the lower end of the center tube 3. A chamfer is provided on the inner side of the upper end of the center tube 3 to facilitate enhancing the sealing performance of the steel ball on the center tube 3 when throwing the ball.

[0055] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A side drilling emergency release joint, characterized in that It includes an upper joint, a lower joint, a center tube, a limiting spring piece and a locking block. The outer side of the lower part of the upper joint and the inner side of the upper part of the lower joint are sealed together. The first limiting ring platform and the second limiting ring platform are fixed at upper and lower intervals on the inner side of the lower part of the lower joint corresponding to the position below the upper joint. The lower end of the first limiting ring platform, the upper end of the second limiting ring platform and the inner wall of the lower joint form a limiting ring groove. A number of limiting spring pieces are evenly distributed along the circumference of the lower end of the upper joint. A locking block located in the limiting ring groove and in contact with the lower end of the first limiting ring platform on the upper side of the lower end of each limiting spring piece is fixed. The inner side of the lower part of the upper joint is sealed with a center tube. The outer side of the lower end of the center tube is detachably fixed with a stop ring whose outer side of the lower end is in sealing contact with the inner side of the second limiting ring platform. The outer side of the stop ring abuts against the inner side of each limiting spring piece.

2. The side drilling emergency release joint according to claim 1 is characterized in that A plurality of limit grooves are distributed along the circumferential interval on the outer side of the upper part of the center tube, and a radially penetrating limit screw hole is provided on the outer side of the upper joint corresponding to each limit groove position, and a first shear nail with an end located in the corresponding limit groove is screwed in each limit screw hole, and at least one first sealing ring groove is provided at upper and lower intervals on the outer side of the center tube corresponding to the position above the first shear nail, and a first sealing ring is installed in each first sealing ring groove.

3. The side drilling emergency release joint according to claim 2 is characterized in that A third limiting ring is fixed to the inner side of the lower part of the lower joint corresponding to the lower end of the second limiting ring. The inner diameters of the third limiting ring, the second limiting ring and the first limiting ring are successively smaller.

4. The side drilling emergency release joint according to claim 3 is characterized in that A fourth limiting ring platform is fixed to the outer side of the middle part of the upper joint corresponding to the upper end position of the lower joint, and a plurality of second sealing ring grooves are arranged at upper and lower intervals on the outer side of the upper joint corresponding to the position between the first shear nail and the fourth limiting ring platform, and a second sealing ring is installed in each second sealing ring groove, and the outer side of the upper joint and the inner side of the lower joint corresponding to the position below the first shear nail are tightly fitted together; or / and, a sealing ring platform is fixed to the outer side of the upper end of the center tube, the first sealing ring groove and the limiting groove are arranged at upper and lower intervals on the outer side of the lower part of the sealing ring platform, and a fifth limiting ring platform is fixed to the inner side of the lower end of the upper joint corresponding to the position below the sealing ring platform.

5. The side drilling emergency release joint according to claim 3 is characterized in that The drill collar is provided with a first limiting step surface on the inner side of the upper part of the upper joint, and a sixth limiting ring is fixed on the outer side of the center tube corresponding to the position above the first limiting step surface, which is in sealing contact with the inner side of the upper joint. A tubular hanging drill collar is sealingly fixed on the inner side of the upper part of the upper joint corresponding to the position above the sixth limiting ring. The inner side of the lower part of the hanging drill collar is in sealing contact with the outer side of the upper part of the center tube. A ball seat with a tubular structure is installed on the inner side of the upper part of the hanging drill collar, and a fixing groove is provided on the outer side of the lower part of the ball seat. A fixing hole connected inside and outside is provided on the outer side of the hanging drill collar corresponding to the position of the fixing groove, and a second shear nail with an end located in the fixing groove is fixed in the fixing hole. A liquid passage with a lower end extending to the lower end of the hanging drill collar is provided on the inner wall of the upper part of the hanging drill collar corresponding to the position above the second shear nail.

6. The side drilling emergency release joint according to claim 5, characterized in that An outer step surface is provided on the outer side of the lower part of the suspension drill collar, an inner step surface is provided on the inner side of the lower part of the suspension drill collar, the upper end of the upper joint is in contact with the outer step surface, the inner side of the upper end of the upper joint is sealed and screwed with the inner side of the lower part of the suspension drill collar, the upper end of the center tube is in contact with the inner step surface, at least one third sealing ring is provided between the outer side of the center tube and the inner side of the lower part of the suspension drill collar, the liquid passage includes a first connecting hole, a second connecting hole, a third connecting hole and a fourth connecting hole, and a radially penetrating first connecting hole is provided on the inner side of the suspension drill collar corresponding to the position above the second shear nail, A second connecting hole is provided on the outer step surface of the hanging drill collar, and the upper end is connected with the first connecting hole. A third connecting hole is provided at the lower end of the hanging joint, and the upper end of the third connecting hole is located above the outer step surface. A fourth connecting hole is provided on the outer side of the lower part of the hanging drill collar, and the fourth connecting hole is connected with the third connecting hole and the second connecting hole. A first blocking wire is sealed and fixedly installed in the first connecting hole corresponding to the position between the second connecting hole and the outer side of the hanging drill collar, and a second blocking wire is sealed and fixedly installed in the fourth connecting hole corresponding to the position between the second connecting hole and the outer side of the hanging drill collar.

7. The side drilling emergency release joint according to claim 6, characterized in that The inner side of the ball seat is provided with a first straight hole, a tapered hole and a second straight hole which are connected in sequence from top to bottom. The inner diameter of the first straight hole is larger than the inner diameter of the second straight hole. At least one fourth sealing ring is provided between the outer side of the ball seat corresponding to the position below the second shear nail and the inner side of the hanging drill collar at an upper and lower interval. At least one fifth sealing ring is provided between the outer side of the ball seat corresponding to the position above the first connecting hole and the inner side of the hanging drill collar at an upper and lower interval.

8. The side drilling emergency release joint according to claim 5, 6 or 7, characterized in that A second limiting step surface is arranged on the inner side of the hanging drill collar corresponding to the position below the ball seat.

9. The side drilling emergency release joint according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7, characterized in that The lower end surface of the first limiting ring is inclined from top to bottom and from inside to outside, and the upper side surface of the locking block matches the lower end surface of the first limiting ring; or / and, the outer side of the upper end of the stop ring and the inner side of the upper end of the center tube are both chamfered.

10. The side drilling emergency release joint according to claim 8, characterized in that The lower end surface of the first limiting ring is inclined from top to bottom and from inside to outside, and the upper side surface of the locking block matches the lower end surface of the first limiting ring; or / and, the outer side of the upper end of the stop ring and the inner side of the upper end of the center tube are both chamfered.

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