Emergency release sub for sidetracking well

Abstract

The present application relates to oil and gas drilling technology field, it is a kind of side drilling well emergency release sub, including upper sub, lower sub, center tube, limit spring piece and lock block, upper sub lower outer side and lower sub upper inner side seal package together, the lower inner side of lower sub corresponding the position below the upper sub is fixed with first limit ring table and second limit ring table, first limit ring table lower end, second limit ring table upper end and lower sub inner wall form limit ring groove.The present application is reasonable and compact in structure, easy to use, when the conventional means cannot be removed in the complex of the side drilling well sticking, it can be released by throwing ball and pressing, so that the drill above release sub and the expensive directional tool can be timely put out of wellhead, only the lowermost drill and drill bit need to be fished to remove the complex and restore the wellbore unobstructed, greatly reduce the complexity of the accident, shorten the complex processing time, save construction cost, at the same time, the well control risk is reduced to a minimum.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil and gas drilling technology, and is an emergency release sub for sidetracking wells. BACKGROUND

[0002] With the development of oil and gas field exploration and development in China, most oil fields have entered a new stage of tapping the potential of old oil fields after implementing various measures. For accident wells such as casing damage and bottom drop, and local formation depletion wells, it is impossible to restore the production capacity of oil and gas wells by using conventional workover measures. Special tools and processes can be used to implement casing window directional drilling to reach the oil and gas enrichment area, so as to realize tapping the potential of old areas and increasing efficiency on the basis of maximizing the use of existing conditions, and improve the ultimate recovery of oil and gas reservoirs. With the continuous maturity of technology, window sidetracking has become one of the important means for increasing reserves and production in oil fields.

[0003] Sidetracking is to drill 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 compared with conventional drilling, the well trajectory is smaller. This results in the limitation of the size of the drill bit, drill pipe, screw rod and other drilling tools for sidetracking wells, and the ability to withstand torque, lifting force and pump pressure is also insufficient. When drilling at high speed, it is easy to cause a stuck drill pipe or a broken drill pipe accident. When an accident occurs, thousands of meters of drill pipe will be stranded in the formation, and a large amount of time and complex treatment are required. If the stuck drill pipe cannot be released in time, the performance of the drilling fluid will change, the formation will collapse, the probability of the drill pipe being buried will increase, and the accident will become more complex. There is an urgent need for a tool that can quickly release the drill pipe in case of a complex situation in sidetracking wells, greatly reducing the complex treatment time and reducing the well control risk. SUMMARY

[0004] The present application provides a kind of emergency release sub for sidetracking wells, overcome the deficiency of above-mentioned prior art, it can effectively solve the problem of long processing time and big well control risk when existing sidetracking wells encounter complex situation.

[0005] The technical scheme of the present application is realized by the following measures: an emergency release sub for sidetracking wells, comprising an upper sub, a lower sub, a center pipe, a limiting spring piece and a locking block, the lower outer side of the upper sub and the inner side of the upper part of the lower sub are sealed and fitted together, the inner side of the lower part of the lower sub is fixed with a first limiting ring table and a second limiting ring table at the lower position of the upper sub, 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 sub form a limiting ring groove, the lower end of the upper sub is uniformly distributed with a plurality of limiting spring pieces along the circumference, the lower end of each limiting spring piece is fixed with a locking block inside the limiting ring groove, and the upper side of the locking block is in contact with the lower end of the first limiting ring table, the inner side of the lower part of the upper sub is sealed and fitted with the center pipe, the outer side of the lower end of the center pipe is detachably fixed with a stop ring in sealing contact with the inner side of the second limiting ring table, and the outer side of the stop ring is in contact with the inner side of each limiting spring piece.

[0006] The following is a further optimization or / and improvement of the above technical solutions:

[0007] The upper outer side of the center pipe can be circumferentially spaced apart by a plurality of limiting grooves, and the outer side of the upper joint corresponding to the position of each limiting groove is provided with a radially penetrating limiting screw hole. Each limiting screw hole is screwed with a first shear pin whose end is located in the corresponding limiting groove. The outer side of the center pipe corresponding to the position above the first shear pin is provided with at least one first sealing ring groove spaced apart upward and downward, and each first sealing ring groove is installed with a first sealing ring.

[0008] The lower inner side of the lower joint corresponding to the lower end position of the second limiting ring table can be fixed with a third limiting ring table, and the inner diameter of the third limiting ring table, the inner diameter of the second limiting ring table and the inner diameter of the first limiting ring table decrease in turn.

[0009] The outer side of the upper joint corresponding to the upper end position of the lower joint can be fixed with a fourth limiting ring table, and the outer side of the upper joint corresponding to the position between the first shear pin and the fourth limiting ring table is provided with a plurality of second sealing ring grooves spaced apart upward and downward, and each second sealing ring groove is installed with a second sealing ring. The outer side of the upper joint corresponding to the position below the first shear pin and the inner side of the lower joint are tightly sleeved together.

[0010] As a preferred, the outer side of the upper end of the center pipe can be fixed with a sealing ring table, and the first sealing ring groove and the limiting groove are spaced apart upward and downward on the outer side of the lower part of the sealing ring table. The inner side of the lower end of the upper joint corresponding to the position below the sealing ring table is fixed with a fifth limiting ring table.

[0011] As another preferred, the above-mentioned can further include a hanging drill collar, a ball seat and a second shear pin. The inner side of the upper part of the upper joint is provided with a first limiting step surface, the outer side of the center pipe corresponding to the position above the first limiting step surface is fixed with a sixth limiting ring table in sealing contact with the inner side of the upper joint, and the upper part of the inner side of the upper joint corresponding to the position above the sixth limiting ring table is sealingly and fixedly installed with a tubular hanging drill collar. The lower inner side of the hanging drill collar is in sealing contact with the outer side of the upper part of the center pipe, and the upper inner side of the hanging drill collar is installed with a tubular structure of a ball seat. The lower outer side of the ball seat is provided with a fixing groove, the outer side of the hanging drill collar corresponding to the position of the fixing groove is provided with an inner-outer communicating fixing hole, and the second shear pin whose end is located in the fixing groove is fixedly installed in the fixing hole. The upper inner wall of the upper part of the hanging drill collar corresponding to the position above the second shear pin is provided with a liquid passing channel extending to the lower end of the hanging drill collar.

[0012] The upper end of the upper joint and the outer stepped surface are in contact with each other, the inner side of the upper end of the upper joint and the inner side of the lower part of the hanging drill collar are sealed and screwed together, the upper end of the central tube and the inner stepped surface are in contact with each other, at least one third sealing ring is arranged between the outer side of the central tube and the inner side of the lower part of the hanging drill collar in an up-down interval, the liquid passage comprises a first connecting hole, a second connecting hole, a third connecting hole and a fourth connecting hole, the inner side of the hanging drill collar corresponding to the position above the second shear pin is provided with a first connecting hole penetrating in the radial direction, the outer stepped surface of the hanging drill collar is provided with a second connecting hole in communication with the first connecting hole in the upper end, the lower end of the hanging joint is provided with a third connecting hole with an opening downward and an upper end located above the outer stepped surface, the outer side of the lower part of the hanging drill collar is provided with a fourth connecting hole with an opening outward, the fourth connecting hole is in communication with the third connecting hole and the second connecting hole, a first plug wire is sealingly 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 plug wire is sealingly 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.

[0013] The inner side of the ball seat can be provided with a first straight hole, a tapered hole and a second straight hole in sequence from top to bottom, the inner diameter of the first straight hole is greater than the inner diameter of the second straight hole, at least one fourth sealing ring is arranged between the outer side of the ball seat corresponding to the position below the second shear pin and the inner side of the hanging drill collar in an up-down interval, and at least one fifth sealing ring is arranged 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 in an up-down interval.

[0014] The inner side of the hanging drill collar corresponding to the position below the ball seat can be provided with a second limiting stepped surface.

[0015] The lower end surface of the first limiting ring table can be inclined from top to bottom from inside to outside, and the upper side surface of the lock block matches the lower end surface of the first limiting ring table.

[0016] The upper end of the outer side of the stop ring and the inner side of the upper end of the central tube can be chamfered.

[0017] The structure of the present application is reasonable and compact, convenient to use, when the conventional means cannot remove the complex in the lateral drilling well, the ball is thrown to pressurize, the release joint above the drilling tool and the expensive directional tool can be taken out of the well mouth in time, only the lowermost drilling tool and the drill bit need to be fished to remove the complex and restore the smoothness of the wellbore, which greatly reduces the complexity of the accident, shortens the complex processing time, saves the construction cost, and reduces the well control risk to the minimum. BRIEF DESCRIPTION OF DRAWINGS

[0018] FIG. 1 is a schematic structural diagram of a front view of an embodiment of the present application. Figure 1 FIG. 2 is a schematic structural diagram of a front view of the embodiment one.

[0019] FIG. 3 is a schematic structural diagram of a front view of the embodiment two. Figure 2 FIG. 4 is a schematic structural diagram of a front view of the upper half of the embodiment six.

[0020] Attachment Figure 3 This is a schematic diagram of the main cross-sectional structure of the lower half of Example 6.

[0021] The codes in the accompanying drawings are: 1 for the upper joint, 2 for the lower joint, 3 for the center tube, 4 for the limiting spring piece, 5 for the locking block, 6 for the stop ring, 7 for the first limiting ring platform, 8 for the second limiting ring platform, 9 for the limiting ring groove, 10 for the sealing ring platform, 11 for the first sealing ring, 12 for the first shear nail, 13 for the third limiting ring platform, 14 for the fourth limiting ring platform, 15 for the second sealing ring, 16 for the fifth limiting ring platform, 17 for the hanging drill collar, 18 for the ball seat, 19 for the 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

[0022] The present invention is not limited to the following embodiments, and specific implementation methods can be determined based on the technical solutions of the present invention and actual conditions.

[0023] In the present invention, for the convenience of description, the relative position relationship of each component is described based on the Figure 1 For example, the positional relationships of front, back, up, down, left, and right are determined according to the layout directions of the drawings in the specification.

[0024] The present invention will be further described below in conjunction with the embodiments and accompanying drawings:

[0025] Example 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, and 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 lower inner side 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, and 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 sealing sleeve of the lower part of the upper joint 1 is provided with a center pipe 3, and the outer side of the lower end of the center pipe 3 is detachably fixed with a stop ring 6 that is in sealing contact with the inner side of the second limiting ring platform 8 on the lower end, and the outer side of the stop ring 6 is against the inner side of each limiting spring piece 4.

[0026] According to the requirement, the inner side of the stop ring 6 is screwed with the outer side of the lower end of the central pipe 3, the outer side of the stop ring 6 is provided with at least one sealing ring at intervals, the lower end of the stop ring 6 is provided with a plurality of radial through dismounting grooves at intervals along the circumference, so as to facilitate the dismounting between the stop ring 6 and the central pipe 3, the thickness of the lock block 5 and the thickness of the limiting spring 4 are less than the difference between the inner ring surface radius of the first limiting ring table 7 and the outer side radius of the central pipe 3, and the lock block 5 and the limiting spring 4 are integrally arranged.

[0027] In use, the upper joint 1 is connected with the pipe column, the inner side of the stop ring 6 is connected with the directional tool, in the normal working state, the inside of the central pipe 3 is through from top to bottom, the normal circulation continuous drilling can be carried out, the lock block 5 at the end of the limiting spring 4 is located in the limiting ring groove 9 under the action of the stop ring 6, the first limiting ring table 7 and the second limiting ring table 8, and is in the self-locking state.

[0028] When the drilling process encounters unknown complexity and cannot be unblocked by conventional means, the steel ball is put in for the releasing operation: the steel ball falls on the upper end of the central pipe 3 to seal the inner side of the central pipe 3, then the high pressure formed by the mud pump acts on the steel ball, the steel ball acts on the upper end of the central pipe 3 to push the central pipe 3 to move downward, at the same time, the stop ring 6 moves downward in the second limiting ring table 8 with the central pipe 3, when the stop ring 6 moves to the lower side of the lock block 5, the lower end of the limiting spring 4 is close to each other, so that the lock block 5 and the limiting ring groove 9 are separated from each other, and the releasing is completed.

[0029] After releasing, the mud pump restores the normal pressure, the pipe column connected with the upper joint 1 is lifted, the lock block 5 and the limiting spring 4 can move upward between the outer side of the central pipe 3 and the inner side of the first limiting ring table 7, so as to take out the upper joint 1, the central pipe 3 and the directional tool suspended on the inner side of the stop ring 6.

[0030] When the conventional means cannot remove the complexity in the sidetracking well, the releasing can be realized by putting the ball and pressing, so that the drilling tools above the releasing joint and the expensive directional tool can be taken out from the wellhead in time, only the lowermost drilling tool and the drill bit need to be fished to remove the complexity and restore the smoothness of the wellbore, which greatly reduces the complexity degree of the accident, shortens the complexity processing time, saves the construction cost, and reduces the well control risk to the minimum.

[0031] According to the actual requirement, the above-mentioned emergency releasing joint for sidetracking well can be further optimized or / and improved:

[0032] Embodiment two: as the optimization of the above-mentioned embodiment, as shown in the attached Figure 1As shown, the outer side of the upper part of the central pipe 3 is circumferentially spaced apart by several limiting grooves, the outer side of the upper joint 1 corresponding to the position of each limiting groove is provided with a radially penetrating limiting screw hole, each limiting screw hole is screwed with a first shear pin 12 whose end is located in the corresponding limiting groove, the outer side of the central pipe 3 corresponding to the position above the first shear pin 12 is provided with at least one first sealing ring groove spaced apart upward and downward, and each first sealing ring groove is mounted with a first sealing ring 11.

[0033] In use, when the first shear pin 12 is sheared, the directional tool installed on the lower part of the central pipe 3 can be lifted by lifting the upper joint 1, and the sealing 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 by setting the first sealing ring 11. When the drilling process encounters unknown complexity and cannot be released by conventional means, the first shear pin 12 can be quickly sheared after the steel ball is put in, and the releasing operation can be quickly completed, thereby improving the working efficiency.

[0034] Embodiment three: as an optimization of the above-mentioned embodiments, as shown in the accompanying drawings Figure 1 As shown, the lower part of the inner side of the lower joint 2 corresponding to the lower end position of the second limiting ring table 8 is fixed with a third limiting ring table 13, and the inner diameter of the third limiting ring table 13, the inner diameter of the second limiting ring table 8 and the inner diameter of the first limiting ring table 7 gradually decrease.

[0035] According to the requirement, the inner side of the upper end of the third limiting ring table 13 and the inner side of the lower end of the second limiting ring table 8 are inclined to transition. In use, by setting the third limiting ring table 13, when the central pipe 3 moves downward, the third limiting ring table 13 can limit the stop ring 6, avoiding the phenomenon of failure caused by the excessive downward movement of the central pipe 3.

[0036] Embodiment four: as an optimization of the above-mentioned embodiments, as shown in the accompanying drawings Figure 1 As shown, the outer side of the middle part of the upper joint 1 corresponding to the upper end position of the lower joint 2 is fixed with a fourth limiting ring table 14, and the outer side of the upper joint 1 corresponding to the position between the first shear pin 12 and the fourth limiting ring table 14 is provided with several second sealing ring grooves spaced apart upward and downward, and each second sealing ring groove is mounted with a second sealing ring 15, and the outer side of the upper joint 1 corresponding to the position below the first shear pin 12 and the inner side of the lower joint 2 are tightly sleeved together.

[0037] According to the needs, 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 by the existing known sealing paper, so that the pulling force of the limiting spring 4 can be reduced, and the deformation of the limiting spring 4 can be prevented. In the use process, by arranging the fourth limiting ring table 14, the locking block 5 can be limited when the upper joint 1 and the lower joint 2 are installed, so that the locking block 5 can be accurately installed in the limiting ring groove 9. By arranging the second sealing ring 15, the sealing performance between the upper joint 1 and the lower joint 2 can be improved, and the upper joint 1 and the lower joint 2 can be separated after the steel ball is put into the upper joint 1. The directional tool installed at the lower part of the central pipe 3 can be lifted by lifting the upper joint 1.

[0038] Embodiment five: as an optimization of the above-mentioned embodiments, as shown in the accompanying drawings Figure 1 The outer side of the upper end of the central pipe 3 is fixed with a sealing ring table 10, and the first sealing ring groove and the limiting groove are arranged at the outer side of the lower part of the sealing ring table 10 in an upper and lower interval. The inner side of the lower end of the upper joint 1 corresponding to the position below the sealing ring table 10 is fixed with a fifth limiting ring table 16.

[0039] According to the needs, the number of the first sealing ring groove is one. In the use process, by arranging the fifth limiting ring table 16, when the first shear nail 12 is cut off, the fifth limiting ring table 16 can support the sealing ring table 10, so that the directional tool installed at the lower part of the central pipe 3 can be lifted by lifting the upper joint 1. By arranging 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 unknown complexity is encountered during drilling and cannot be released by conventional means, the first shear nail 12 can be quickly cut off after the steel ball is put in, the releasing operation can be quickly completed, and the working efficiency is improved.

[0040] The use process of the embodiment is as follows:

[0041] In the normal working state, the inside of the central pipe 3 is through from top to bottom, and normal circulation continuous drilling can be carried out. The locking block 5 at the end of the limiting spring 4 is located in the limiting ring groove 9 under the action of the stop ring 6, the first limiting ring table 7 and the second limiting ring table 8, and is in a self-locking state.

[0042] When unknown complexity is encountered during drilling and cannot be released by conventional means, the releasing operation is carried out by putting in a steel ball: after the steel ball falls on the upper end of the central pipe 3, the inside of the central pipe 3 is sealed, and then the high pressure formed by the mud pump acts on the steel ball. After the steel ball acts on the upper end of the central pipe 3, the first shear nail 12 is cut off, and then the central pipe 3 is pushed downward and falls on the upper end of the fifth limiting ring table 16 inside the lower part of the upper joint 1. At the same time, the stop ring 6 moves downward in the second limiting ring table 8 with the central pipe 3. When the stop ring 6 moves to the position below the locking block 5, the lower ends of the limiting springs 4 move inward to each other, so that the locking block 5 and the limiting ring groove 9 are separated from each other, and the releasing operation is completed.

[0043] After the mud pump is released, the normal pressure is restored, and the pipe string connected to the upper joint 1 is lifted. The locking block 5 and the limiting spring piece 4 can move upward from the outside of the central pipe 3 and the inside of the first limiting ring platform 7, thereby lifting the upper joint 1, the central pipe 3 and the directional tool, such as the MWD (wireless measurement while drilling) whose upper end is suspended on the inside of the stop ring 6.

[0044] Example 6: As an optimization of Example 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, and a sixth limiting ring platform 21 is fixed on the outer side of the center pipe 3 corresponding to the position above the first limiting step surface 20, which is in sealing contact with the inner side of the upper joint 1. A tubular hanging drill collar 17 is sealed and fixed 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 with 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 portion 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 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.

[0045] 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 inserted to perform the release operation. The steel ball falls on the ball seat 18, forming 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, thereby shearing the second shear pin 19. After the ball seat 18 falls, the liquid channel is opened, and the liquid channel enters the mud, and forms a high pressure to push the sixth limit ring 21 and the center pipe 3. The first shear pin 12 is cut under the action of the thrust, and then the center pipe 3 moves 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 below the locking block 5, the lower ends of the limit springs 4 move inward 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 release, the mud pump returns to normal pressure, and the pipe string connected to the hanging drill collar 17 is lifted. The locking block 5 and the limiting spring piece 4 can move upward from the outside of the central pipe 3 and the inside of the first limiting ring 7, thereby lifting the upper joint 1, the central pipe 3 and the directional tool installed on the inside of the hanging drill collar 17, such as the MWD (wireless measurement while drilling).

[0047] 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 tool, so that after it is released, the positioning tool is always located in the hanging drill collar 17, avoiding damage due to wear between the positioning tool and the well wall after the hanging drill collar 17 is lifted, thereby improving the protection performance of the directional instrument during use.

[0048] Example 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, and 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, and 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, and 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. A radially extending 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, the upper end of which 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 opened outward. The fourth connecting hole 27 is connected with 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. 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.

[0049] In 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, facilitating 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 pipe 3 and between the outer side of the hanging drill collar 17 and the inner side of the upper sub 1 can be improved. When performing the releasing operation, after the steel ball is put in, the mud acts on the steel ball and the ball seat 18, so that the second shear pin 19 is sheared, and then the ball seat 18 is pushed to move downward. When the upper end of the ball seat 18 is located below the first connecting hole 24, the mud flows into the closed annular space formed by the lower end of the hanging drill collar 17, the outer side of the central pipe 3, the upper end of the sixth limiting ring table 21 and the inner side of the upper sub 1 after passing through the liquid passage. The mud acts on the sixth limiting ring table 21, so that the first shear pin 12 is sheared, and then the central pipe 3 is pushed to move downward and falls on the upper end of the sixth limiting ring table 21 inside the lower part of the upper sub 1. At the same time, the stop ring 6 moves downward in the second limiting ring table 8 with the central pipe 3. When the stop ring 6 moves to below the lock block 5, the lower ends of the limiting spring sheets 4 move inward to each other, so that the lock block 5 and the limiting ring groove 9 are separated from each other, and the releasing is completed.

[0050] After the releasing, the mud pump restores the normal pressure, the pipe string connected with the hanging drill collar 17 is pulled up, and the lock block 5 and the limiting spring sheet 4 can move upward from between the outer side of the central pipe 3 and the inner side of the first limiting ring table 7, so as to pull out the upper sub 1, the central pipe 3 and the directional tool, such as MWD (measurement while drilling), installed inside the hanging drill collar 17.

[0051] Embodiment eight: as an optimization of the above-mentioned embodiments, as shown in the accompanying Figure 2 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 sequentially communicated from top to bottom. The inner diameter of the first straight hole 30 is greater 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 hanging drill collar 17 in an up-down interval. 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 hanging drill collar 17 in an up-down interval. According to the requirements, the tapered hole 31 is tapered upward with a smaller lower part.

[0052] In use, through such a setting, when performing the releasing operation, after the steel ball is put in, the steel ball can fall in the tapered hole 31, improving the sealing performance of the steel ball to the ball seat 18, so as to facilitate the shearing of the second shear pin 19.

[0053] Embodiment nine: as an optimization of the above-mentioned embodiments, as shown in the accompanying Figure 2 The inner side of the hanging drill collar 17 corresponding to the position below the ball seat 18 is provided with a second limiting step surface 36.

[0054] In use, through such a setting, after the steel ball is put 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, and the setting of the second limiting step surface 36 can make the mud flow into the liquid passage, thereby acting on the sixth limiting ring table 21, so that the first shear nail 12 can be quickly sheared off, and the releasing efficiency is improved.

[0055] Embodiment ten: as an optimization of the above-mentioned embodiments, as shown in the accompanying drawings, Figure 3 The lower end surface of the first limiting ring table 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 table 7.

[0056] In use, through such a setting, when the center pipe 3 drives the stop ring 6 to move downward to below the locking block 5, the lower end of the limiting spring plate 4 drives the locking block 5 to swing inward and then resets, so that the locking block 5 is smoothly separated from the limiting ring groove 9, and lifting the upper connector 1 can also avoid the locking block 5 from rubbing against the first limiting ring table 7 to cause the upper connector 1 to be unable to be smoothly lifted.

[0057] Embodiment eleven: as an optimization of the above-mentioned embodiments, as shown in the accompanying drawings, Figure 3 The upper end outside of the stop ring 6 and the upper end inside of the center pipe 3 are both provided with chamfers.

[0058] In use, the upper end outside of the stop ring 6 is provided with a chamfer, which facilitates the insertion of the stop ring 6 into the limiting spring plate 4 and the installation of the center pipe 3 together with the lower end outside of the center pipe 3, and the upper end inside of the center pipe 3 is provided with a chamfer, which facilitates the sealing performance of the steel ball to the center pipe 3 when the ball is put in.

[0059] The above technical features constitute embodiments of the present application, which have strong adaptability and implementation effect, and unnecessary technical features can be added or reduced according to actual needs to meet the needs of different situations.

Claims

1. A side drilling emergency release joint, characterized by: The cam is secured to the cam face and is adapted to engage said locking member, wherein the cam is secured to the cam face with said locking member being secured to said locking member. A plurality of limiting grooves are distributed along the circumference of the outer side of the upper part of the center tube. A radially penetrating limiting screw hole is provided on the outer side of the upper joint corresponding to each limiting groove position. A first shearing nail with an end located in the corresponding limiting groove is screwed into each limiting screw hole. At least one first sealing ring groove is provided at intervals above and below the outer side of the center tube corresponding to the position above the first shearing nail. A first sealing ring is installed in each first sealing ring groove. A third limiting ring is fixed on 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 larger. The cam is provided with a second shear nail, a first limiting step surface on the inner side of the upper joint, a sixth limiting ring platform is fixed on the outer side of the center tube corresponding to the position above the first limiting step surface, and is in sealing contact with the inner side of the upper joint; a tubular hanging drill collar is sealed and fixed on the inner side of the upper joint corresponding to the position above the sixth limiting ring platform; the inner side of the lower part of the hanging drill collar is in sealing contact with the outer side of the upper 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 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 an end portion 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; 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 together 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, the upper end of which is connected with the first connecting hole, and a third connecting hole is provided at the lower end of the hanging joint, the upper end of which is located above the outer step surface. A fourth connecting hole opening outward 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.

2. The side drilling emergency release joint according to claim 1, 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 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.

3. The side drilling emergency release joint according to claim 1 or 2, characterized in that: A second limiting step surface is provided on the inner side of the hanging drill collar corresponding to the position below the ball seat.

4. The side drilling emergency release joint according to claim 1 or 2, 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 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.

5. The side drilling emergency release joint according to claim 3, 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 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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