While-drilling releasing jam releasing tool for well drilling

Abstract

The invention discloses a while-drilling releasing jam releasing tool for well drilling. The while-drilling releasing jam releasing tool comprises an upper connector, a lower connector, a shell, a sliding sleeve and a sliding stop block. The upper joint and the lower joint are detachably connected with the shell; the lower connector is provided with a limiting groove used for installing the sliding stop block, and the sliding stop block can limit the lower connector to move in the axial direction of the lower connector. The sliding sleeve is arranged between the shell and the lower joint; a radial through hole and an axial through hole are formed in the sliding sleeve; the sliding sleeve has a first state and a second state, when the sliding sleeve is in the first state, the sliding stop block is arranged in the limiting groove and abuts against the inner wall of the sliding sleeve, and when the sliding sleeve is in the second state, the sliding stop block is removed from the limiting groove and enters the radial through hole, so that the lower connector can be separated from the shell. Compared with the prior art, the while-drilling releasing jam releasing tool for well drilling can be connected into a drilling tool, drilling is not affected during normal drilling, quick releasing jam releasing can be achieved when malignant jamming occurs, and the while-drilling releasing jam releasing tool is simple in structure and high in reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling tools, and particularly relates to a drill string releasing and sticking - releasing tool for drilling. Background Art

[0002] In oil and gas drilling, with the continuous deepening of the oil - field drilling development process, there are often vicious sticking - in - hole accidents at the site where normal sticking - releasing measures cannot release the stuck drill string due to falling debris. The sticking points of such sticking - in - hole accidents are mainly concentrated at the drill bit and the near - bit stabilizer at the very bottom of the drill string assembly. Usually, the way of releasing and sticking - releasing can be used to handle such vicious sticking - in - hole accidents. Releasing and sticking - releasing is a sticking - releasing method that abandons part of the drill string stuck in the hole when other measures cannot release the stuck drill string. Conventional treatments include back - off, explosive loosening, chemical cutting, and the disconnection method of the releasing and sticking - releasing tool. However, back - off has the disadvantages that the loosening position is uncertain and multiple back - off operations are required with the cooperation of fishing tools; explosive loosening has the disadvantages of cumbersome operation procedures, difficult determination of explosive charge, and long approval processes; chemical cutting has the disadvantage that the drill string diameter in the large - inclination well section cannot meet the requirements for long - distance cable transmission.

[0003] Therefore, how to provide a drill string releasing and sticking - releasing tool for drilling, which can realize normal drilling without affecting the drilling process and can quickly release and stick - release in case of vicious sticking - in - hole accidents, not only has a simple structure but also has high reliability, is a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a drill string releasing and sticking - releasing tool for drilling, which can realize normal drilling without affecting the drilling process and can quickly release and stick - release in case of vicious sticking - in - hole accidents, not only has a simple structure but also has high reliability.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A drill string releasing and sticking - releasing tool for drilling includes an upper sub, a lower sub, a housing, a sliding sleeve, and a sliding stop block;

[0007] Both the upper sub and the lower sub are detachably connected to the housing;

[0008] A limiting groove for installing the sliding stop block is formed on the lower sub, and the sliding stop block can limit the axial movement of the lower sub along the lower sub;

[0009] The sliding sleeve is arranged between the housing and the lower sub, and radial through - holes and axial through - holes are formed on the sliding sleeve;

[0010] The sliding sleeve has a first state and a second state. When the sliding sleeve is in the first state, the sliding stop block is placed in the limiting groove and abuts against the inner wall of the sliding sleeve. When the sliding sleeve is in the second state, the sliding stop block is removed from the limiting groove and enters the radial through - hole, so that the lower sub can be separated from the housing.

[0011] Optionally, it further includes a shear pin. A pin hole annular groove is provided on the sliding sleeve, and a pin hole is provided on the housing. The shear pin can pass through the pin hole annular groove and the pin hole to connect the sliding sleeve and the housing.

[0012] Optionally, it further includes a delivery item, which is used to be delivered into the sliding sleeve to increase the force for the sliding sleeve to move downward.

[0013] Optionally, it further includes an adjusting sleeve, which is arranged at the lower part of the sliding block to adjust the height of the sliding block;

[0014] A housing step is further provided on the inner side wall of the housing, and the adjusting sleeve abuts against the housing step.

[0015] Optionally, the upper end face of the adjusting sleeve is an inclined plane, and there is a first included angle between the upper end face of the adjusting sleeve and the horizontal plane. The angle value of the first included angle is greater than the self-locking angle value of metal-to-metal sliding.

[0016] Optionally, the sliding sleeve includes a connected first sliding sleeve part and a second sliding sleeve part. The axial through hole penetrates the first sliding sleeve part and the second sliding sleeve part. The first sliding sleeve part is arranged close to the upper joint, and the second sliding sleeve part is arranged close to the lower joint;

[0017] The first sliding sleeve part is used for clamping the delivery item;

[0018] Radial through holes are opened on the second sliding sleeve part. The number of the radial through holes is the same as that of the sliding blocks and they are arranged in one-to-one correspondence. The radial projection of the radial through holes is larger than the radial projection of the sliding blocks.

[0019] Optionally, it further includes a spline sleeve, which is arranged between the lower joint and the housing;

[0020] Internal splines are provided on the inner wall of the spline sleeve, and external splines matching the internal splines are provided on the lower joint;

[0021] External threads are provided on the outer wall of the spline sleeve, and second threads matching the first threads are provided on the housing.

[0022] Optionally, an annular step is provided on the lower joint, and the spline sleeve abuts against the step surface of the annular step. There is a second included angle between the step surface and the horizontal plane. The angle value of the second included angle is greater than the self-locking angle value of metal-to-metal sliding.

[0023] Optionally, there are multiple sliding blocks, which are evenly arranged along the circumferential direction of the limiting groove;

[0024] The upper end face of the sliding block is an inclined plane, and the included angle between the upper end face of the sliding block and the horizontal plane is a third included angle. The angle value of the third included angle is equal to the self-locking angle value of metal-to-metal sliding.

[0025] Optionally, it further includes a centralizing sleeve disposed between the upper sub and the sliding sleeve. The inner wall of the centralizing sleeve abuts against the upper sub, and the outer wall of the centralizing sleeve abuts against the sliding sleeve.

[0026] Optionally, a first arc surface is provided on the side of the sliding block close to the sliding sleeve. The first arc surface can be in clearance fit with the housing. A second arc surface is provided on the side of the sliding block close to the upper sub. The second arc surface is in clearance fit with the lower sub.

[0027] A first chamfer is provided on the first arc surface. The included angle between the first chamfer and the plumb line is the fourth included angle.

[0028] A second chamfer is provided on the wall of the radial through hole. The included angle between the second chamfer and the plumb line is the fifth included angle. The value of the fourth included angle is greater than the value of the fifth included angle.

[0029] It can be seen from the above technical solutions that when drilling is required, first install the downhole drill - string release and sticking - releasing tool in the lower part of the drill string, above the easily stuck part (drill bit or drill - bit centralizer). When normal drilling is carried out, the sliding sleeve is in the first state, that is, the sliding block is placed in the limit groove and abuts against the inner wall of the sliding sleeve. When a serious sticking accident occurs and it is necessary to abandon the stuck part (drill bit, drill - bit centralizer) of the drill string, the sliding sleeve is in the second state, that is, the sliding block disengages from the limit groove and enters the radial through - hole of the sliding sleeve. At this time, the sliding block cannot limit the lower sub, and the lower sub will move downward along its axis to disengage from the housing.

[0030] Compared with the prior art, the downhole drill - string release and sticking - releasing tool disclosed in the embodiments of the present invention can be connected in the drill string, does not affect drilling during normal drilling, and can achieve quick release and sticking - releasing when a serious sticking accident occurs. It not only has a simple structure but also high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following briefly introduces the drawings required for describing the embodiments or the prior art. Obviously, the following drawings are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0032] Figure 1 It is the front view of the downhole drill - string release and sticking - releasing tool with a centralizing sleeve disclosed in the embodiments of the present invention;

[0033] Figure 2 It is the front view of the downhole drill - string release and sticking - releasing tool without a centralizing sleeve disclosed in the embodiments of the present invention;

[0034] Figure 3The partial front view of the drilling while-drilling releasing and unjamming tool provided with a centralizing sleeve disclosed in the embodiment of the present invention;

[0035] Figure 4 The structural schematic diagram of the sliding sleeve disclosed in the embodiment of the present invention;

[0036] Figure 5 The partial structural schematic diagram of the sliding sleeve disclosed in the embodiment of the present invention.

[0037] Among them, the names of each component are as follows:

[0038] 100, lower sub; 200, upper sub; 300, spline sleeve; 400, housing; 401, housing step; 500, sliding sleeve; 501, first sliding sleeve part; 502, second sliding sleeve part; 503, axial through hole; 504, radial through hole; 600, sliding block; 700, adjusting sleeve; 800, centralizing sleeve; 900, shear pin; 1000, dropping object. Detailed implementation manners

[0039] In view of this, the core of the present invention is to provide a drilling while-drilling releasing and unjamming tool, which does not affect drilling during normal drilling, and can achieve quick releasing and unjamming when severe sticking occurs. It not only has a simple structure, but also has high reliability.

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] Please refer to Figures 1-5 , Figure 1 The front view of the drilling while-drilling releasing and unjamming tool provided with a centralizing sleeve disclosed in the embodiment of the present invention; Figure 2 The front view of the drilling while-drilling releasing and unjamming tool without a centralizing sleeve disclosed in the embodiment of the present invention; Figure 3 The partial front view of the drilling while-drilling releasing and unjamming tool provided with a centralizing sleeve disclosed in the embodiment of the present invention; Figure 4 The structural schematic diagram of the sliding sleeve disclosed in the embodiment of the present invention; Figure 5 The partial structural schematic diagram of the sliding sleeve disclosed in the embodiment of the present invention.

[0042] The drill - with - drill - string release and stuck - pipe - releasing tool disclosed in the embodiments of the present invention includes an upper sub 200, a lower sub 100, a housing 400, a sliding sleeve 500, and a sliding stopper 600. The upper sub 200 and the lower sub 100 are both detachably connected to the housing 400. A limiting groove for installing the sliding stopper 600 is provided on the lower sub 100, and the sliding stopper 600 can limit the axial movement of the lower sub 100 along the axis of the lower sub 100.

[0043] Specifically, the sliding sleeve 500 is arranged between the housing 400 and the lower sub 100. The sliding sleeve 500 is provided with a radial through - hole 504 and an axial through - hole 503.

[0044] Among them, the sliding sleeve 500 has a first state and a second state. When the sliding sleeve 500 is in the first state, the sliding stopper 600 is placed in the limiting groove and abuts against the inner wall of the sliding sleeve 500. When the sliding sleeve 500 is in the second state, the sliding stopper 600 is removed from the limiting groove and enters the radial through - hole 504, so that the lower sub 100 can be separated from the housing 400.

[0045] When drilling is required, first install the drill - with - drill - string release and stuck - pipe - releasing tool at the lower part of the drill string, above the easily stuck part (drill bit or drill - bit centralizer). When normal drilling is carried out, the sliding sleeve 500 is in the first state, that is, the sliding stopper 600 is placed in the limiting groove and abuts against the inner wall of the sliding sleeve 500. When a severe stuck - pipe situation occurs and it is necessary to abandon the stuck part (drill bit, drill - bit centralizer) of the drill string, the sliding sleeve 500 is in the second state, that is, the sliding stopper 600 is removed from the limiting groove and enters the radial through - hole 504 of the sliding sleeve 500. At this time, the sliding stopper 600 cannot limit the lower sub 100, and the lower sub 100 will move downward along its axis to be separated from the housing 400.

[0046] Compared with the prior art, the drill - with - drill - string release and stuck - pipe - releasing tool disclosed in the embodiments of the present invention can be connected to the drill string. During normal drilling, it does not affect drilling. When a severe stuck - pipe situation occurs, it can achieve quick release and stuck - pipe - releasing. It not only has a simple structure but also has high reliability.

[0047] It should be explained that the "downward movement" refers to the movement in the direction away from the upper sub 200.

[0048] The embodiments of the present invention do not limit the specific connection method between the sliding sleeve 500 and the housing 400. As long as the structure meets the use requirements of the present invention, it is within the protection scope of the present invention.

[0049] As one possible embodiment, the drill-through release and stuck-free tool disclosed in the embodiments of the present invention further includes a shear pin 900. Among them, a pin hole ring groove is provided on the sliding sleeve 500, and a pin hole is provided on the housing 400. The shear pin 900 can pass through the pin hole ring groove and the pin hole to connect the sliding sleeve 500 and the housing 400. This is arranged to facilitate the separation of the sliding sleeve 500 from the housing 400 when the sliding sleeve 500 moves downward.

[0050] In order to enable the sliding sleeve 500 to move downward smoothly, the drill-through release and stuck-free tool disclosed in the embodiments of the present invention further includes a dropping object 1000. Among them, the dropping object 1000 is used to be dropped into the sliding sleeve 500 to increase the force for the sliding sleeve 500 to move downward.

[0051] In order to facilitate the connection of the height of the sliding block 600, the drill-through release and stuck-free tool disclosed in the embodiments of the present invention further includes an adjusting sleeve 700. Among them, the adjusting sleeve 700 is arranged at the lower part of the sliding block 600, and the adjusting sleeve 700 can adjust the height of the sliding block 600.

[0052] Among them, a housing step 401 is further provided on the inner side wall of the housing 400, and the adjusting sleeve 700 abuts against the housing step 401.

[0053] It should be noted that the upper end surface of the adjusting sleeve 700 is an inclined surface, and there is a first included angle between the upper end surface of the adjusting sleeve 700 and the horizontal plane, and the angle value of the first included angle is greater than the self-locking angle value of metal-to-metal sliding.

[0054] The embodiments of the present invention do not limit the specific structure of the sliding sleeve 500, and any structure that meets the use requirements of the present invention is within the protection scope of the present invention.

[0055] As one possible embodiment, please refer to Figures 4-5 , the sliding sleeve 500 disclosed in the embodiments of the invention includes a connected first sliding sleeve part 501 and a second sliding sleeve part 502. Among them, an axial through hole 503 penetrates through the first sliding sleeve part 501 and the second sliding sleeve part 502. The first sliding sleeve part 501 is arranged close to the upper joint 200, and the second sliding sleeve part 502 is arranged close to the lower joint 100.

[0056] The first sliding sleeve 500 part is used to clamp the dropping object 1000.

[0057] It should be noted that the dropping object 1000 is a high-strength alloy-structured ball, and the diameter of the ball is greater than the diameter of the axial through hole 503 of the sliding sleeve 500.

[0058] With such a setting, when the ball is put into the wellhead on the ground, the ball can be stuck in the sliding sleeve 500. At this time, the pump pressure of the drilling fluid is increased, and the high-pressure drilling fluid can push the ball and the sliding sleeve 500 downward. At this time, the shear pin 900 cannot bear the downward pressure brought by the high-pressure pump, and the shear pin 900 breaks, causing the sliding sleeve 500 to break away from the shear pin 900 and move downward. When the lower end face of the sliding sleeve 500 contacts the step surface of the housing step 401 of the housing 400, it stops moving.

[0059] It should be noted that the radial through holes 504 are formed in the second sliding sleeve portion 502. The number of the radial through holes 504 is the same as that of the sliding blocks 600 and they are arranged in one-to-one correspondence. The radial projection of the radial through holes 504 is larger than the radial projection of the sliding blocks 600. With such a setting, the sliding blocks 600 meet the conditions of entering the radial through holes 504 in terms of both quantity and size in the radial projection direction. When the sliding blocks 600 are not at the same height as the radial through holes 504 of the sliding sleeve 500, the sliding blocks 600 cannot enter the radial through holes 504 of the sliding sleeve 500 due to the influence of the inner wall structure of the sliding sleeve 500. When the sliding sleeve 500 slides down to the same height as the sliding blocks 600, the sliding blocks 600 are no longer affected by the inner wall structure of the sliding sleeve 500 and thus enter the radial through holes 504.

[0060] As a further embodiment, the drilling with-string release and stuck-free tool disclosed in the embodiments of the present invention further includes a spline sleeve 300, and the spline sleeve 300 is arranged between the lower sub 100 and the housing 400. Among them, internal splines are provided on the inner wall of the spline sleeve 300, external splines mating with the internal splines are provided on the lower sub 100, a first thread is provided on the outer wall of the spline sleeve 300, and a second thread mating with the first thread is provided on the housing 400.

[0061] With such a setting, the cooperation between the internal splines of the spline sleeve 300 and the external splines of the lower sub 100 can play a role in transmitting torque, and the threaded connection between the housing 400 and the spline 300 can play a role in transmitting torque, tension and pressure.

[0062] As a further embodiment, a ring-shaped step is provided on the lower sub 100 disclosed in the embodiments of the present invention. Among them, the spline sleeve 300 abuts against the step surface of the ring-shaped step, and a second included angle is formed between the step surface and the horizontal plane. The angle value of the second included angle is greater than the self-locking angle value of metal-to-metal sliding. With such a setting, when the spline sleeve 300 is subjected to a downward pressure from the housing 400, the lower end face of the spline sleeve 300 abuts against the step surface of the ring-shaped step of the lower sub 100 to transmit the downward pressure to the lower sub 100; when the spline sleeve 300 is subjected to a circumferential torque from the housing 400, the internal splines of the spline sleeve come into contact with the external splines of the lower sub 100 to transmit the torque to the lower sub 100.

[0063] As a further embodiment, multiple sliding blocks 600 disclosed in the embodiments of the present invention are arranged uniformly along the circumferential direction of the limiting groove. With such a setting, the force on each sliding block 600 can be reduced.

[0064] It should be noted that the upper end surface of the sliding block 600 is an inclined surface, and the included angle between the upper end surface of the sliding block and the horizontal plane is the third included angle, and the angular value of the third included angle is greater than the self-locking angle value of metal-to-metal sliding. With such a setting, when the sliding block 600 is subjected to the downward pressure from the limiting groove of the lower joint 100 and the upward pressure of the adjusting sleeve 700, the downward pressure of the limiting groove of the lower joint 100 will generate a radially outward component force through the third included angle to push the sliding block 600 to move radially outward, and the upward pressure of the adjusting sleeve 700 will also generate a radially outward component force through the third included angle to push the sliding block 600 to move radially outward.

[0065] It should be explained that the "radially outward component force" refers to the component force towards the direction of the housing 400.

[0066] It should be noted that when the thickness of the sliding sleeve 500 is small and there is a gap between the sliding sleeve 500 and the upper joint 200, a filler needs to be provided in the gap to improve the reliability of their connection.

[0067] For details, please refer to Figure 1 , however, when the thickness of the sliding sleeve 500 is large and there is no gap between the sliding sleeve 500 and the upper joint 200, there is no need to set a filler. For details, please refer to Figure 2 .

[0068] As one of the preferred embodiments, the drill-through release and stuck-free tool disclosed in the embodiments of the present invention further includes a centralizing sleeve 800. Among them, the centralizing sleeve 800 is arranged between the upper joint 200 and the sliding sleeve 500, and the inner wall of the centralizing sleeve 800 abuts against the upper joint 200, and the outer wall of the centralizing sleeve 800 abuts against the sliding sleeve 500.

[0069] With such a setting, the centralizing sleeve 800 can be filled between the lower joint 100 and the sliding sleeve 500 to avoid the phenomenon that the gap between the lower joint 100 and the sliding sleeve 500 reduces the reliability.

[0070] It should be noted that a first arc surface is provided on the side of the sliding block 600 close to the sliding sleeve 500, and the first arc surface can be in clearance fit with the housing 400. A second arc surface is provided on the side of the sliding block 600 close to the upper joint 200, and the second arc surface is in clearance fit with the lower joint 100.

[0071] With such a setting, when the sliding block 600 moves downward along the axis of the lower joint 100, it can fit with the lower joint 100. When moving radially outward, it can fit with the inner wall of the housing 400, maximizing the radial dimension of the sliding block 600.

[0072] It should be further noted that the upper and lower end faces of the sliding block 600 are flat. With such a setting, the size of the plurality of sliding blocks 600 in the circumferential direction is maximally increased, thereby improving the strength of the sliding block 600.

[0073] As a further embodiment, a first chamfer is provided on the first arc surface disclosed in the embodiment of the present invention, and the included angle between the first chamfer and the plumb line is the fourth included angle.

[0074] A second chamfer is provided on the inner wall of the radial through hole 504, and the included angle between the second chamfer and the plumb line is the fifth included angle. The angle value of the fourth included angle is greater than the angle value of the fifth included angle; with such a setting, for indoor disassembly and assembly, the sliding block 600 can be displaced manually in the radial direction during the disassembly and assembly process.

[0075] It should be explained that the plumb line refers to the line connecting the center of gravity of an object and the center of gravity of the earth (measured with a conical plumb bob).

[0076] It should be noted that, please refer to Figure 3 In the embodiment of the present invention, the first included angle is represented by a, the second included angle is represented by b, the third included angle is represented by c, the fourth included angle is represented by d, and the fifth included angle is represented by e.

[0077] It should be explained that the angle values of the first included angle, the second included angle, and the third included angle are greater than the self-locking angle value of metal-to-metal sliding: for example, the self-locking angle between steel materials under lubricated conditions is 8.5°. If the above components are processed with steel, the angle value of the second included angle needs to be greater than 8.5°, and for example, it can be designed as 9°.

[0078] Finally, it should also be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or device.

[0079] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts between the various embodiments, reference can be made to each other.

[0080] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A downhole release and stuck freeing tool for drilling, characterized in that, It includes an upper joint, a lower joint, a housing, a sliding sleeve and a sliding block; Both the upper joint and the lower joint are detachably connected to the housing; A limiting groove for installing the sliding block is formed on the lower joint, and the sliding block can limit the axial movement of the lower joint along the lower joint; The sliding sleeve is arranged between the housing and the lower joint, and a radial through hole and an axial through hole are formed on the sliding sleeve; The sliding sleeve has a first state and a second state. When the sliding sleeve is in the first state, the sliding block is placed in the limiting groove and abuts against the inner wall of the sliding sleeve. When the sliding sleeve is in the second state, the sliding block is removed from the limiting groove and enters the radial through hole, so that the lower joint can be separated from the housing.

2. The drill-in coiled tubing releasing and unjamming tool according to claim 1, wherein It further includes a shear pin. A pin hole ring groove is arranged on the sliding sleeve, and a pin hole is arranged on the housing. The shear pin can pass through the pin hole ring groove and the pin hole to connect the sliding sleeve and the housing.

3. The drilling while-drilling release and unblocking tool according to claim 1, characterized in that, It further includes a delivery object, which is used to be delivered into the sliding sleeve to increase the force for the sliding sleeve to move downward.

4. The drill-through with-drill-string releasing and sticking-unsticking tool according to claim 1, wherein, It further includes an adjusting sleeve, which is arranged at the lower part of the sliding block to adjust the height of the sliding block; A housing step is further arranged on the inner side wall of the housing, and the adjusting sleeve abuts against the housing step.

5. The drill-through release and stuck-free tool according to claim 4, wherein, The upper end face of the adjusting sleeve is an inclined plane, and there is a first included angle between the upper end face of the adjusting sleeve and the horizontal plane. The angle value of the first included angle is greater than the self-locking angle value of metal-to-metal sliding.

6. The drill-through retrievable stuck pipe releasing tool according to claim 3, characterized in that, The sliding sleeve includes a connected first sliding sleeve part and a second sliding sleeve part. The axial through hole penetrates through the first sliding sleeve part and the second sliding sleeve part. The first sliding sleeve part is arranged close to the upper joint, and the second sliding sleeve part is arranged close to the lower joint; The first sliding sleeve part is used for clamping the delivery object; The radial through hole is formed on the second sliding sleeve part. The number of the radial through holes is the same as the number of the sliding blocks and is arranged in one-to-one correspondence. The radial projection of the radial through hole is greater than the radial projection of the sliding block.

7. The drill-through while-drilling releasing and unjamming tool according to claim 1, wherein It further includes a spline sleeve, which is arranged between the lower joint and the housing; Internal splines are arranged on the inner wall of the spline sleeve, and external splines matched with the internal splines are arranged on the lower joint; External threads are arranged on the outer wall of the spline sleeve, and internal threads matched with the external threads are arranged on the housing.

8. The drill-through while-drilling releasing and unjamming tool according to claim 7, characterized in that, A ring-shaped step is arranged on the lower joint, and the spline sleeve abuts against the step surface of the ring-shaped step. There is a second included angle between the step surface and the horizontal plane. The angle value of the second included angle is greater than the self-locking angle value of metal-to-metal sliding.

9. The drill-through free-release and stuck-pipe releasing tool according to claim 1, wherein, The sliding blocks are multiple and are evenly arranged along the circumferential direction of the limiting groove; The upper end face of the sliding block is an inclined plane, and the included angle between the upper end face of the sliding block and the horizontal plane is a third included angle. The angle value of the third included angle is greater than the self-locking angle value of metal-to-metal sliding.

10. The drill-through free-release and stuck-pipe releasing tool according to claim 1, wherein, It further includes a centering sleeve, which is arranged between the upper joint and the sliding sleeve. The inner wall of the centering sleeve abuts against the upper joint, and the outer wall of the centering sleeve abuts against the sliding sleeve.

11. The downhole drillstring release and stuck-free tool according to claim 1, wherein, A first arc surface is provided on the sliding block near the side of the sliding sleeve, and the first arc surface can be in clearance fit with the housing. A second arc surface is provided on the sliding block near the side of the upper joint, and the second arc surface is in clearance fit with the lower joint; A first chamfer is provided on the first arc surface, and the included angle between the first chamfer and the plumb line is the fourth included angle; A second chamfer is provided on the pore wall of the radial through hole, and the included angle between the second chamfer and the plumb line is the fifth included angle. The angular value of the fourth included angle is greater than that of the fifth included angle.

Images