Large-diameter gas mining well drifting device

Abstract

The invention relates to the technical field of well drilling, in particular to a large-diameter gas mining well drifting device which comprises a connecting pipe, a drifting pipe and a centralizer, and the upper end of the connecting pipe is used for being connected with a drill rod; the top end of the pigging pipe is fixedly connected with the bottom end of the connecting pipe, and teeth are arranged at the bottom end of the pigging pipe. The centralizer is fixedly arranged outside the connecting pipe in a sleeving manner; a plurality of anti-attachment assemblies are arranged on the outer portion of the drifting pipe in a sleeving mode, and the multiple anti-attachment assemblies are evenly and densely distributed on the drifting pipe. The anti-adhesion device is provided with the anti-adhesion assembly, the multiple adhesion blocks are arranged on the outer surface of the anti-adhesion assembly, and when the exterior of the drifting device is blocked by muck, the adhesion blocks can automatically retract, so that friction force is instantly reduced, the drifting device can smoothly rotate, and the probability of the phenomenon of drill jamming is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of drilling, in particular to a large-diameter gas mining well clearing device. Background Art

[0002] Underground gas refers to the general term for toxic and harmful gases mainly composed of methane in underground mines. At present, the common methods of underground gas extraction include extraction of gas from mining layers, extraction of gas from adjacent layers, extraction of gas from goafs, and extraction of gas from surrounding rocks. In the process of underground gas extraction, it is inevitable to carry out drilling so that the drilling can directly reach the storage space of underground gas for easy extraction.

[0003] Nowadays, the specific drilling process includes the following steps: logging, reaming, well cleaning, casing and cementing. At present, since the well wall is rough and irregular after drilling, it is necessary to perform well cleaning to make the well wall smooth and flat, which is conducive to the smooth lowering of the casing. The existing well cleaning device is usually a circular tube structure, and the bottom end of the circular tube structure has teeth, and the top end can be connected to the drill pipe. Specifically, during the well cleaning operation, the circular tube structure needs to be placed in the well, and then it is driven by the drill pipe to rotate and lower it at the same time to grind the inner wall of the well flat.

[0004] For example, the Chinese patent with publication number CN211598607U proposes a coiled tubing screw drill grinding device, which specifically includes a coiled tubing connector, a hydraulic safety joint, a screw motor and a three-cone drill bit. In the specific operation, the patented technical solution drives the three-cone drill bit to rotate through the screw motor to perform the well cleaning task.

[0005] However, when performing the well-clearing operation, as the well-clearing device is continuously lowered, debris and gravel will continue to fall from the well wall. Part of the falling debris can pass through the well-clearing device, and the other part may gather in the gap between the well-clearing device and the well wall. As the debris accumulates more and more, it will inevitably hinder the rotation of the well-clearing device. In severe cases, drill jamming may occur. In actual production processes, accidents in which the well-clearing device draws out a new wellbore due to obstruction also occur frequently. To this end, we have proposed a large-diameter gas mining well clearing device to effectively solve the above-mentioned drawbacks. Summary of the invention

[0006] The object of the present invention is to provide a large-diameter gas mining well access device for solving the problems raised in the above-mentioned background technology.

[0007] The present invention is realized by the following technical scheme: a large-caliber gas mining well access device, comprising:

[0008] A connecting pipe, the upper end of which is used to be connected to the drill pipe;

[0009] A well-through pipe, the top end of which is fixedly connected to the bottom end of the connecting pipe, and the bottom end of which is provided with teeth;

[0010] A centralizer, the centralizer is fixedly sleeved on the outside of the connecting pipe;

[0011] The outer sleeve of the well pipe is provided with an anti-adhesion component, the number of the anti-adhesion components is several, and the several anti-adhesion components are evenly and densely distributed on the well pipe, the anti-adhesion component includes an inner sleeve and an outer sleeve, the inner sleeve is connected to the well pipe, the outer sleeve is rotatably sleeved on the outside of the inner sleeve, the outer surface of the outer sleeve is evenly spaced with embedded grooves, and the embedded grooves are movably provided with adhesion blocks;

[0012] The inner surface of the outer bushing is provided with a through-opening corresponding to the embedded groove one by one, and the through-opening is communicated with the corresponding embedded groove. A driving groove is provided on the inner surface of the attachment block and at a position opposite to the through-opening. The outer surface of the inner bushing is provided with a driving block corresponding to the through-opening one by one, and the end of the driving block passes through the through-opening and extends into the driving groove. A driving column is provided on the surface of the driving block. The inner surface of the driving groove is provided with an arc groove corresponding to the driving column one by one, and the driving column is embedded in the corresponding arc groove. The two ends of the arc groove are at different distances from the center of the outer bushing. When the outer bushing rotates clockwise relative to the inner bushing, the attachment block makes a radial inward contraction movement.

[0013] Optionally, a push spring is connected between the attachment block and the inner surface of the embedded groove. In a natural state, the push spring is in a compressed state, and the drive column is located at one end of the inner part of the arc groove, and the outer surface of the attachment block is flush with the outer surface of the outer sleeve.

[0014] Optionally, a first annular groove is formed on the inner surface of the outer bushing, a bearing is disposed in the first annular groove, and an inner ring of the bearing is fixedly connected to the outer surface of the inner bushing.

[0015] Optionally, a second annular groove is formed on the inner surface of the outer bushing, a spring is disposed in the second annular groove, and the inner end and the outer end of the spring are fixedly connected to the inner bushing and the inner wall of the second annular groove respectively.

[0016] Optionally, the outer surface of the inner sleeve is provided with a first blocking block and a second blocking block at intervals along the circumferential direction, the first blocking block and the second blocking block are both located in the first annular groove, the inner wall of the first annular groove is provided with a matching block, and the matching block is located between the first blocking block and the second blocking block; in a natural state, the matching block abuts against the first blocking block, and the clockwork spring is in a tightened state.

[0017] Optionally, the anti-adhesion component also includes a positioning ring, which is fixedly sleeved on the outside of the well pipe, the positioning ring is located above the corresponding inner sleeve, and the bottom surface of the positioning ring is provided with a guide column, the top surface of the inner sleeve is provided with a guide groove for inserting the guide column, and the outside of the guide column is also sleeved with a return spring, the two ends of the return spring respectively abut against the bottom surface of the positioning ring and the top surface of the inner sleeve, in a natural state, the return spring is in a compressed state, and the bottom end of the inner sleeve abuts against the positioning ring located therebelow.

[0018] Optionally, the outer fixing sleeve of the positioning ring is provided with a shielding ring, the top end of the shielding ring is higher than the top surface of the positioning ring, the bottom end of the shielding ring is lower than the bottom surface of the positioning ring, and the bottom of the shielding ring covers the outer side of the top of the corresponding outer sleeve.

[0019] Optionally, a water storage cavity is provided on the outer surface of the attachment block, and an annular flange is fixedly provided on the bottom surface of the positioning ring. In a natural state, the top surface of the outer sleeve does not contact the annular flange, and the water storage cavity is not connected to the interior of the well pipe; when the top surface of the outer sleeve abuts against the annular flange and the mating block abuts against the second blocking block, the water storage cavity and the interior of the well pipe are connected.

[0020] Optionally, a first through hole is provided on the side wall of the inner sleeve, and a second through hole corresponding to the first through hole is provided on the side wall of the well pipe, the second through hole is located above the corresponding first through hole, and when the outer sleeve abuts against the annular flange, the first through hole and the second through hole are aligned; a third through hole is provided on the inner surface of the outer sleeve, a sealing ring is sleeved in the third annular groove, the sealing ring is tightly fitted with the outer surface of the inner sleeve, a third through hole is provided on the sealing ring, and a fourth through hole aligned with and communicated with the third through hole is provided on the inner surface of the embedded groove, a hose is provided in the fourth through hole, and the end of the hose away from the fourth through hole is communicated with the water storage chamber; when the mating block abuts against the second blocking block, the third through hole is aligned with the first through hole.

[0021] Optionally, a cover plate is provided inside the water storage chamber, and water spray mesh holes are evenly distributed on the cover plate. The inner bottom and top ends of the well pipe are respectively provided with a lower plug and an upper plug, and the upper plug is in a ring shape. The connecting rod is a hollow tubular structure, and the connecting rod is connected to the interior of the well pipe.

[0022] Compared with the prior art, the present invention provides a large-caliber gas mining well access device, which has the following beneficial effects:

[0023] 1. The present invention has an anti-adhesion component, and the outer surface of the anti-adhesion component has a plurality of adhesion blocks. When the outside of the well-drilling device encounters obstacles from debris, the adhesion blocks can automatically retract, thereby instantly reducing the friction force, so that the well-drilling device can rotate smoothly, and the probability of the occurrence of the drill sticking phenomenon is reduced;

[0024] 2. The outer bushing in the present invention is elastically connected to the lower part of the positioning ring. When the outer bushing encounters resistance in the axial direction, the outer bushing can retreat upward for a distance, and the flushing liquid in the well-draining pipe can be sprayed out from the mesh holes on the cover plate, thereby wetting the slag and reducing the friction resistance, so that the well-draining device can smoothly pass through the slag;

[0025] 3. The number of anti-adhesion components in the present invention is several, and the several anti-adhesion components are evenly and densely distributed on the outside of the well-draining device. When one of the outer bushings is blocked by the debris, the cover plate on the outer bushing can spray water outward alone, which is conducive to the accurate wetting of the debris by the flushing liquid;

[0026] 4. The connecting pipe of the present invention is also provided with a centralizer, which is helpful to keep the well-clearing device extending into the well in the vertical direction, thereby improving the stability and safety of the well-clearing operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the well pipe structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of the anti-adhesion component of the present invention;

[0030] Figure 4 This is a schematic diagram of the outer bushing structure of the present invention;

[0031] Figure 5 It is a schematic diagram of the structure of the inner liner of the present invention;

[0032] Figure 6 This is a cross-sectional view of the well pipe structure of the present invention;

[0033] Figure 7 is a cross-sectional view of the anti-adhesion component of the present invention;

[0034] Figure 8 This is a schematic diagram of the back side of the attachment block of the present invention;

[0035] Fig. 9 It is a partial cross-sectional view of the anti-adhesion component of the present invention.

[0036] In the figure: 100, connecting pipe; 200, well pipe; 201, teeth; 300, centralizer; 400, anti-adhesion component; 401, inner bushing; 402, outer bushing; 403, first annular groove; 404, bearing; 405, embedded groove; 406, attachment block; 407, through-hole; 408, driving groove; 409, driving block; 410, driving column; 411, arc groove; 412, push spring; 413, second annular groove; 414, Strip spring; 415, first blocking block; 416, second blocking block; 417, matching block; 418, positioning ring; 419, guide column; 420, guide groove; 421, return spring; 422, shielding ring; 423, water storage chamber; 424, annular flange; 425, first through hole; 426, second through hole; 427, third annular groove; 428, sealing ring; 429, third through hole; 430, fourth through hole; 431, hose; 432, cover plate. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figure 1 - Fig. 9 The embodiment of the present application proposes a large-diameter gas mining well clearing device, including a connecting pipe 100, a clearing pipe 200 and a centralizer 300; wherein, the upper end of the connecting pipe 100 is used to be connected to the drill pipe; the top end of the clearing pipe 200 is fixedly connected to the bottom end of the connecting pipe 100, and the bottom end of the clearing pipe 200 is provided with teeth 201; the centralizer 300 is fixedly sleeved on the outside of the connecting pipe 100; and is used to maintain the stability of the present well clearing device.

[0039] In specific applications of this embodiment, it is necessary to connect the top of the connecting pipe 100 and the bottom of the drill pipe, specifically by threaded connection, and then put the well-clearing pipe 200 into the well, and use the drill pipe to drive the well-clearing device to rotate while slowly descending, so that the inner wall of the well is polished by the teeth 201, so that the inner wall of the well is changed from rough and irregular to relatively flat, so as to facilitate the entry of the casing.

[0040] As the well pipe 200 is continuously extended into the well, debris and gravel will continue to fall from the inner wall of the well. A part of the fallen debris may pass through the well pipe 200 and fall into the bottom of the well, and another part may be stuck in the outer wall of the well pipe 200 and the well clearance. As the debris on the outer wall of the well pipe 200 accumulates more and more, it will also hinder the rotation of the well pipe 200. In order to prevent the debris from hindering the rotation of the well pipe 200, the embodiment of the present application is provided with an anti-adhesion component 400 on the outer sleeve of the well pipe 200. The specific structure of the anti-adhesion component 400 is described in detail below:

[0041] There are several anti-adhesion components 400, and several anti-adhesion components 400 are evenly and densely distributed on the well pipe 200. The anti-adhesion components 400 include an inner sleeve 401 and an outer sleeve 402. The inner sleeve 401 is connected to the well pipe 200, and the outer sleeve 402 is rotatably sleeved on the outside of the inner sleeve 401. The inner surface of the outer sleeve 402 is provided with a first annular groove 403, and a bearing 404 is provided in the first annular groove 403. The inner ring of the bearing 404 is fixedly connected to the outer surface of the inner sleeve 401. Therefore, the outer sleeve 402 is rotatably connected to the outside of the inner sleeve 401 through the bearing 404.

[0042] It is worth mentioning that the bottom diameter of the wellbore pipe 200 is larger than the diameter of the outer bushing 402 , so when the teeth 201 grind the inner wall of the well, there is a certain gap between the outer bushing 402 and the inner wall of the well.

[0043] In some embodiments, the outer surface of the outer bushing 402 is evenly spaced with embedded grooves 405, and the embedded grooves 405 are evenly distributed on the outer surface of the outer bushing 402 along the circumferential direction. An attachment block 406 is movably arranged in the embedded groove 405; specifically, the inner surface of the outer bushing 402 is provided with through openings 407 corresponding to the embedded grooves 405, and the through openings 407 are communicated with the corresponding embedded grooves 405, and the inner surface of the attachment block 406 is provided with a driving groove 406 at a position directly opposite to the through openings 407. 08. A driving block 409 corresponding to the through-hole 407 is disposed on the outer surface of the inner bushing 401. The end of the driving block 409 passes through the through-hole 407 and extends into the driving groove 408. A driving column 410 is disposed on the surface of the driving block 409. An arc groove 411 corresponding to the driving column 410 is formed on the inner surface of the driving groove 408. The driving column 410 is embedded in the corresponding arc groove 411. The two ends of the arc groove 411 are at different distances from the center of the outer bushing 402.

[0044] In addition, a push spring 412 is connected between the attachment block 406 and the inner surface of the embedded groove 405. In the natural state, the push spring 412 is in a compressed state, and the driving column 410 is located at one end of the inner part of the arc groove 411. The outer surface of the attachment block 406 is flush with the outer surface of the outer bushing 402. A second annular groove 413 is provided on the inner surface of the outer bushing 402. A spring 414 is provided in the second annular groove 413. The inner and outer ends of the spring 414 are fixedly connected to the inner bushing 401 and the inner wall of the second annular groove 413, respectively. In the natural state, the spring 414 is in a tightened state, and the spring 414 always applies a force to the outer bushing 402 to drive it to rotate counterclockwise relative to the inner bushing 401.

[0045] It should be noted that, assuming that the end of the arc groove 411 closer to the center of the outer bushing 402 is the starting end, and the other end is the terminal end, when the attachment block 406 is not subjected to other external forces, under the thrust of the push spring 412 and the spring spring 414, the drive column 410 is always located in the starting end of the arc groove 411. When the outer bushing 402 rotates clockwise relative to the inner bushing 401, the drive column 410 will also move from the starting end to the terminal end, and the attachment block 406 will perform a radial inward contraction movement.

[0046] In actual application of this embodiment, the drill pipe drives the well guide 200 to rotate counterclockwise, and there is a certain gap between the outer bushing 402 and the inner wall of the well. When the well guide 200 rotates normally, the outer bushing 402 and the inner wall of the well will not generate friction, so the well guide 200 will not be hindered by the well wall. When the debris between the outside of the well guide 200 and the well wall accumulates more and more, the debris will hinder the rotation of the outer bushing 402. When the resistance is greater than the torsion of the spring 414, the outer bushing 402 will rotate clockwise relative to the inner bushing 401, and then the attachment block 406 will shrink inward, so as to achieve the effect of instantly reducing the friction between the outer bushing 402 and the debris, which helps the well guide 200 to rotate normally to pass through the debris.

[0047] In some embodiments of the present application, the outer surface of the inner sleeve 401 is provided with a first stopper 415 and a second stopper 416 at intervals along the circumferential direction, and the first stopper 415 and the second stopper 416 are both located in the first annular groove 403. The inner wall of the first annular groove 403 is provided with a matching block 417, and the matching block 417 is located between the first stopper 415 and the second stopper 416; in a natural state, the matching block 417 abuts against the first stopper 415, and when the outer sleeve 402 rotates a certain angle clockwise relative to the inner sleeve 401, the matching block 417 abuts against the second stopper 416, at which time the outer sleeve 402 cannot continue to rotate, and at this time the driving column 410 is also located in the terminal of the arc groove 411. Therefore, the first stopper 415 and the second stopper 416 are used to limit the rotation range of the outer sleeve 402.

[0048] In another embodiment of the present application, the anti-adhesion component 400 further includes a positioning ring 418, which is fixedly sleeved on the outside of the well pipe 200, and is located above the corresponding inner sleeve 401, and the bottom surface of the positioning ring 418 is provided with a guide column 419, and the top surface of the inner sleeve 401 is provided with a guide groove 420 for the guide column 419 to be inserted, and the outer side of the guide column 419 is also sleeved with a return spring 421, and the two ends of the return spring 421 are respectively in contact with the bottom surface of the positioning ring 418 and the top surface of the inner sleeve 401, and in a natural state, the return spring 421 is in a compressed state, and the bottom end of the inner sleeve 401 is in contact with the positioning ring 418 located below it. Therefore, the inner sleeve 401 is equivalent to being movably sleeved on the outside of the well pipe 200, and the inner sleeve 401 is slidably connected to the guide column 419, and the inner sleeve 401 can slide vertically along the guide column 419. The return spring 421 is in a compressed state, so the return spring 421 always applies a downward thrust to the inner sleeve 401, so that the bottom end of the inner sleeve 401 abuts against a positioning ring 418 located below. It should be noted that the inner sleeve 401 located at the bottom abuts against the upper edge of the bottom end of the well pipe 200.

[0049] Furthermore, the outer fixing sleeve of the positioning ring 418 is provided with a shielding ring 422, the top end of the shielding ring 422 is higher than the top surface of the positioning ring 418, the bottom end of the shielding ring 422 is lower than the bottom surface of the positioning ring 418, and the bottom of the shielding ring 422 covers the top outer side of the corresponding outer sleeve 402, and the outer surface of the outer sleeve 402 also has a small gap with the inner surface of the shielding ring 422, so that the debris will not enter the top and bottom space of the outer sleeve 402, and the shielding ring 422 will not hinder the outer sleeve 402 from sliding up and down.

[0050] It should be added that a blocking ring 422 is also provided on the upper edge of the bottom end of the well pipe 200. The blocking ring 422 is sleeved on the outer side of the bottom of the lowest outer sleeve 402 to prevent debris from entering between the lowest outer sleeve 402 and the upper edge of the bottom end of the well pipe 200.

[0051] The structures of the attachment block 406, the inner sleeve 401 and the outer sleeve 402 are further described below:

[0052] Among them, a water storage chamber 423 is opened on the outer surface of the attachment block 406, and an annular flange 424 is fixedly provided on the bottom surface of the positioning ring 418. In the natural state, the top surface of the outer sleeve 402 is not in contact with the annular flange 424, and the water storage chamber 423 is not connected to the interior of the well pipe 200; when the top surface of the outer sleeve 402 abuts against the annular flange 424, and the matching block 417 abuts against the second blocking block 416, the water storage chamber 423 is connected to the interior of the well pipe 200.

[0053] Specifically, a first through hole 425 is formed on the side wall of the inner bushing 401, and a second through hole 426 corresponding to the first through hole 425 is formed on the side wall of the well pipe 200. The second through hole 426 is located above the corresponding first through hole 425. When the outer bushing 402 abuts against the annular flange 424, the first through hole 425 and the second through hole 426 are aligned. A third annular groove 427 is formed on the inner surface of the outer bushing 402, and a sealing ring 426 is sleeved in the third annular groove 427. 8. The sealing ring 428 fits tightly with the outer surface of the inner sleeve 401. The sealing ring 428 is provided with a third through hole 429. The inner surface of the embedded groove 405 is provided with a fourth through hole 430 which is aligned with and communicated with the third through hole 429. A hose 431 is provided in the fourth through hole 430. One end of the hose 431 away from the fourth through hole 430 is communicated with the water storage chamber 423. When the matching block 417 abuts against the second blocking block 416, the third through hole 429 is aligned with the first through hole 425.

[0054] In addition, a cover plate 432 is provided inside the water storage chamber 423, and water spray mesh holes are evenly distributed on the cover plate 432. The bottom and top ends of the inside of the well pipe 200 are respectively provided with a lower plug and an upper plug, and the upper plug is in a ring shape. The connecting pipe 100 is a hollow tubular structure, and the connecting pipe 100 is connected to the inside of the well pipe 200.

[0055] In summary, when the attachment block 406 and the outer bushing 402 are not acted upon by external forces, that is, in the initial state, the matching block 417 abuts against the first blocking block 415, and the outer surface of the attachment block 406 is flush with the outer surface of the outer bushing 402, and at this time, the water storage chamber 423 is not connected to the interior of the well pipe 200. When more and more debris is accumulated between the outer surface of the outer bushing 402 and the well wall, the debris will hinder the normal rotation of the outer bushing 402, causing the outer bushing 402 to rotate clockwise compared to the inner bushing 401, so that the matching block 417 abuts against the second blocking block 416, and when the outer bushing 402 abuts against the annular flange 424, the first through hole 425 and the second through hole 426 are aligned, and the third through hole 429 is also aligned with the first through hole 425, then the water storage chamber 423 and the interior of the well pipe 200 are connected.

[0056] In actual application of this embodiment, the staff can inject flushing liquid into the well pipe 200 through the drill pipe. The flushing liquid can be water. Since under natural conditions, the water storage chamber 423 and the inside of the well pipe 200 are not connected, the flushing liquid in the well pipe 200 is always in a high-pressure state and cannot overflow.

[0057] As the wellbore 200 continues to drill downward, the teeth 201 can continuously grind the inner wall of the well, so that the inner wall of the well gradually changes from irregular to flat. During the grinding process, a small amount of debris will continue to fall from the inner wall of the well located above the wellbore 200. Part of the fallen debris can smoothly pass through the wellbore 200 and fall into the bottom of the well, and the other part is easily stuck between the wellbore 200 and the inner wall of the well. As the debris accumulates more and more, the debris will hinder the rotation of the outer bushing 402. When the resistance is greater than the torsion of the spring 414, the outer bushing 402 can rotate clockwise at a certain angle relative to the inner bushing 401, so that the attachment block 406 shrinks inward, thereby instantly reducing the friction between the attachment block 406 and the debris, allowing the wellbore 200 to smoothly pass through the debris.

[0058] If the attachment block 406 shrinks inward and still cannot get rid of the debris, then as the well pipe 200 moves downward, the outer sleeve 402 cannot move downward synchronously with the well pipe 200 due to the resistance of the debris, until the top of the outer sleeve 402 abuts against the annular flange 424. At this time, the water storage chamber 423 and the interior of the well pipe 200 are connected, and water flows out from the mesh holes on the cover plate 432 to moisten and soften the debris, thereby improving the ability of the well pipe 200 to pass through the debris.

[0059] It is worth mentioning that in the present embodiment, there are several anti-adhesion components 400, and the position where the debris is attached is not fixed. When the debris hinders the rotation of a certain outer sleeve 402, water will also be ejected from the corresponding outer sleeve 402, while the other normally rotating anti-adhesion components 400 will not spray water outward. Therefore, it is beneficial for the water flow to be concentrated on the debris at the corresponding position, thereby improving the spraying accuracy and maintaining the spraying intensity of the water flow.

[0060] It should be noted that, in this article, relational terms such as first and second, etc. 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 terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large-caliber gas mining well access device, characterized in that: include: A connecting pipe (100), the upper end of which is used to be connected to a drill pipe; A well-draining pipe (200), the top end of the well-draining pipe (200) being fixedly connected to the bottom end of the connecting pipe (100), and the bottom end of the well-draining pipe (200) being provided with teeth (201); A centralizer (300), wherein the centralizer (300) is fixedly sleeved on the outside of the connecting pipe (100); The outer sleeve of the well-draining pipe (200) is provided with an anti-adhesion component (400), the number of the anti-adhesion components (400) is several, and the several anti-adhesion components (400) are evenly and densely distributed on the well-draining pipe (200), the anti-adhesion component (400) comprises an inner sleeve (401) and an outer sleeve (402), the inner sleeve (401) is connected to the well-draining pipe (200), the outer sleeve (402) is rotatably sleeved on the outer side of the inner sleeve (401), the outer surface of the outer sleeve (402) is provided with inner grooves (405) evenly spaced apart, and an adhesion block (406) is movably provided in the inner sleeve (405); The inner surface of the outer bushing (402) is provided with a through hole (407) corresponding to the embedded groove (405) one by one, and the through hole (407) is communicated with the corresponding embedded groove (405). The inner surface of the attachment block (406) is provided with a driving groove (408) at a position directly opposite to the through hole (407). The outer surface of the inner bushing (401) is provided with a driving block (409) corresponding to the through hole (407) one by one, and the end of the driving block (409) passes through the through hole (407) and extends into the driving groove ( 408), a driving column (410) is provided on the surface of the driving block (409), and an arc groove (411) corresponding to the driving column (410) is opened on the inner surface of the driving groove (408), and the driving column (410) is embedded in the corresponding arc groove (411), and the two ends of the arc groove (411) are at different distances from the center of the outer sleeve (402); when the outer sleeve (402) rotates clockwise relative to the inner sleeve (401), the attachment block (406) performs an inward contraction movement along the radial direction.

2. A large-diameter gas mining well access device according to claim 1, characterized in that: A push spring (412) is connected between the attachment block (406) and the inner surface of the embedded groove (405). In a natural state, the push spring (412) is in a compressed state, and the drive column (410) is located at one end inside the arc groove (411). The outer surface of the attachment block (406) is flush with the outer surface of the outer bushing (402).

3. A large-diameter gas mining well access device according to claim 1, characterized in that: The inner surface of the outer bushing (402) is provided with a first annular groove (403), a bearing (404) is provided in the first annular groove (403), and the inner ring of the bearing (404) is fixedly connected to the outer surface of the inner bushing (401).

4. A large-diameter gas mining well access device according to claim 3, characterized in that: A second annular groove (413) is provided on the inner surface of the outer bushing (402), a spring (414) is provided in the second annular groove (413), and the inner end and the outer end of the spring (414) are fixedly connected to the inner bushing (401) and the inner wall of the second annular groove (413), respectively.

5. A large-diameter gas mining well access device according to claim 4, characterized in that: The outer surface of the inner sleeve (401) is provided with a first blocking block (415) and a second blocking block (416) at intervals along the circumferential direction. The first blocking block (415) and the second blocking block (416) are both located in the first annular groove (403). The inner wall of the first annular groove (403) is provided with a matching block (417). The matching block (417) is located between the first blocking block (415) and the second blocking block (416). In a natural state, the matching block (417) abuts against the first blocking block (415), and the clockwork spring (414) is in a tightened state.

6. A large-diameter gas mining well access device according to claim 5, characterized in that: The anti-adhesion component (400) also includes a positioning ring (418), which is fixedly mounted on the outside of the wellbore (200), and the positioning ring (418) is located above the corresponding inner sleeve (401), and the bottom surface of the positioning ring (418) is provided with a guide column (419), and the top surface of the inner sleeve (401) is provided with a guide groove (420) for the guide column (419) to be inserted, and the outside of the guide column (419) is also sleeved with a return spring (421), and the two ends of the return spring (421) are respectively in contact with the bottom surface of the positioning ring (418) and the top surface of the inner sleeve (401), and in a natural state, the return spring (421) is in a compressed state, and the bottom end of the inner sleeve (401) is in contact with the positioning ring (418) located below it.

7. A large-diameter gas mining well access device according to claim 6, characterized in that: The outer fixing sleeve of the positioning ring (418) is provided with a shielding ring (422), the top end of the shielding ring (422) is higher than the top surface of the positioning ring (418), the bottom end of the shielding ring (422) is lower than the bottom surface of the positioning ring (418), and the bottom of the shielding ring (422) covers the outer side of the top of the corresponding outer sleeve (402).

8. A large-diameter gas mining well access device according to claim 7, characterized in that: The outer surface of the attachment block (406) is provided with a water storage chamber (423), and the bottom surface of the positioning ring (418) is fixedly provided with an annular flange (424). In a natural state, the top surface of the outer sleeve (402) does not contact the annular flange (424), and the water storage chamber (423) is not connected to the interior of the well pipe (200); when the top surface of the outer sleeve (402) abuts against the annular flange (424), and the matching block (417) abuts against the second blocking block (416), the water storage chamber (423) is connected to the interior of the well pipe (200).

9. A large-diameter gas mining well access device according to claim 8, characterized in that: A first through hole (425) is provided on the side wall of the inner bushing (401), and a second through hole (426) corresponding to the first through hole (425) is provided on the side wall of the well pipe (200), and the second through hole (426) is located above the corresponding first through hole (425). When the outer bushing (402) abuts against the annular flange (424), the first through hole (425) and the second through hole (426) are aligned; a third annular groove (427) is provided on the inner surface of the outer bushing (402), and a sealing ring (428) is sleeved in the third annular groove (427), and the sealing ring (428) fits tightly with the outer surface of the inner sleeve (401), a third through hole (429) is provided on the sealing ring (428), a fourth through hole (430) is provided on the inner surface of the embedded groove (405) and is aligned with and communicated with the third through hole (429), a hose (431) is provided in the fourth through hole (430), and one end of the hose (431) away from the fourth through hole (430) is communicated with the water storage chamber (423); when the matching block (417) abuts against the second blocking block (416), the third through hole (429) is aligned with the first through hole (425).

10. A large-diameter gas mining well access device according to claim 8, characterized in that: A cover plate (432) is provided inside the water storage chamber (423), and water spray mesh holes are evenly distributed on the cover plate (432). A lower plug and an upper plug are provided at the bottom and top of the well-clearing pipe (200), respectively, and the upper plug is in a ring shape. The connecting pipe (100) is a hollow tubular structure, and the connecting pipe (100) is in communication with the inside of the well-clearing pipe (200).

Images