Large-diameter gas extraction well through well device

Abstract

The present application relates to the technical field of drilling, in particular to a large-diameter gas extraction well through device, which comprises a connecting pipe, a through pipe and a centralizer, wherein the upper end of the connecting pipe is used for connecting with a drill pipe; the top end of the through pipe is fixedly connected with the bottom end of the connecting pipe, and the bottom end of the through pipe is provided with a tooth; the centralizer is fixedly sleeved on the outside of the connecting pipe; the outside of the through pipe is sleeved with a plurality of anti-attachment assemblies which are evenly distributed on the through pipe. The through device has the anti-attachment assemblies, the outer surface of the anti-attachment assemblies is provided with a plurality of attachment blocks, when the outside of the through device is hindered by slag, the attachment blocks can automatically retract, thereby instantaneously reducing the friction, so that the through device can smoothly rotate, and the probability of sticking phenomenon is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drilling, in particular to a large-diameter gas extraction well drilling device. BACKGROUND

[0002] Underground gas refers to the total name of underground toxic and harmful gas mainly composed of methane. At present, the common ways of underground gas extraction include mining layer gas drainage, adjacent layer gas drainage, goaf gas drainage and surrounding rock gas drainage. In the process of underground gas extraction, drilling treatment is inevitably needed to make the drilling reach the underground gas storage space and facilitate extraction.

[0003] Nowadays, the specific drilling process includes logging, reaming drilling, drilling, casing and cementing and other steps. At present, after drilling is completed, the well wall is rough and irregular, so drilling treatment is needed to make the well wall smooth and flat, which is conducive to the smooth placement of the casing. The existing drilling device is usually in the form of a circular tube, and the bottom end of the circular tube structure has teeth, and the top end can be connected with the drill rod. Specifically, during the drilling operation, the circular tube structure is placed in the drilling, and then it is rotated and lowered with the drill rod to polish the inner wall of the drilling.

[0004] For example, a continuous tubing with screw rod drilling and grinding drilling device is disclosed in Chinese Patent No. CN211598607U, which specifically includes a continuous tubing connector, a hydraulic safety joint, a screw motor and a three-cone drill bit. The patent technical solution drives the three-cone drill bit to rotate by the screw motor to perform the drilling task.

[0005] However, during the drilling operation, the drilling device is continuously lowered, and the slag and stones on the well wall also continuously fall. Some of the falling slag can pass through the drilling device, and the other part may accumulate in the gap between the drilling device and the well wall. As the slag accumulates more and more, it will inevitably hinder the rotation of the drilling device, and in severe cases, it will also cause the phenomenon of sticking. In actual production process, accidents of drilling device drawing a new wellbore due to resistance also often occur. Therefore, we propose a large-diameter gas extraction well drilling device to solve the above problems. SUMMARY

[0006] The purpose of the present application is to provide a large-diameter gas extraction well drilling device to solve the problems raised in the background art.

[0007] The present application is realized by the following technical solution: a large-diameter gas extraction well drilling device, comprising:

[0008] The upper end of the connecting pipe is connected with the drill rod;

[0009] a through well pipe, a top end of the through well pipe is fixedly connected with a bottom end of the connecting pipe, and a bottom end of the through well pipe is provided with a tooth;

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

[0011] wherein, the outside of the through well pipe is sleeved with anti-attachment assemblies, the number of the anti-attachment assemblies is several, and the several anti-attachment assemblies are uniformly and densely distributed on the through well pipe, the anti-attachment assembly comprises an inner sleeve and an outer sleeve, the inner sleeve is connected with the through well pipe, the outer sleeve is rotatably sleeved on the outside of the inner sleeve, the outer surface of the outer sleeve is uniformly and spacedly provided with an embedded groove, and the embedded groove movably holds an attachment block;

[0012] the inner surface of the outer sleeve is provided with a through hole corresponding to the embedded groove, the through hole is communicated with the corresponding embedded groove, the inner surface of the attachment block is provided with a driving groove at a position opposite to the through hole, the outer surface of the inner sleeve is provided with a driving block corresponding to the through hole, the end of the driving block passes through the through hole and extends into the driving groove, the surface of the driving block is provided with a driving column, the inner surface of the driving groove is provided with an arc-shaped groove corresponding to the driving column, the driving column is embedded in the corresponding arc-shaped groove, and the two ends of the arc-shaped groove are different in distance from the center position of the outer sleeve; when the outer sleeve rotates clockwise relative to the inner sleeve, the attachment block performs a radially inward contraction movement.

[0013] Optionally, a pushing spring is connected between the inner surface of the attachment block and the embedded groove, in a natural state, the pushing spring is in a compressed state, the driving column is located at the inner end of the arc-shaped groove, and the outer surface of the attachment block is flush with the outer surface of the outer sleeve.

[0014] Optionally, the inner surface of the outer sleeve is provided with a first annular groove, and the first annular groove holds a bearing, and the inner ring of the bearing is fixedly connected with the outer surface of the inner sleeve.

[0015] Optionally, the inner surface of the outer sleeve is provided with a second annular groove, and the second annular groove holds a clock spring, and the inner end and the outer end of the clock spring are fixedly connected with the inner sleeve and the inner wall of the second annular groove, respectively.

[0016] Optionally, the outer surface of the inner sleeve is spacedly provided with a first blocking block and a second blocking block in the circumferential direction, the first blocking block and the second blocking block are 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 clock spring is in a twisted state.

[0017] Optionally, the anti-attachment assembly further comprises a positioning ring, the positioning ring is fixedly sleeved on the outside of the through well pipe, the positioning ring is located above the corresponding inner bushing, and the bottom surface of the positioning ring is provided with a guide column, the top surface of the inner bushing is provided with a guide groove for inserting the guide column, and the outside of the guide column is further sleeved with a reset spring, the two ends of the reset spring are respectively abutted with the bottom surface of the positioning ring and the top surface of the inner bushing, and in a natural state, the reset spring is in a compressed state, and the bottom end of the inner bushing is abutted with the positioning ring located below.

[0018] Optionally, the outside of the positioning ring is fixedly sleeved 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 top outside of the corresponding outer bushing.

[0019] Optionally, the outer surface of the attachment block is provided with a water storage cavity, the bottom surface of the positioning ring is fixedly provided with an annular flange, in a natural state, the top surface of the outer bushing is not in contact with the annular flange, and the water storage cavity is not communicated with the inside of the through well pipe; when the top surface of the outer bushing is abutted with the annular flange and the matching block is abutted with the second blocking block, the water storage cavity and the inside of the through well pipe are communicated.

[0020] Optionally, the side wall of the inner bushing is provided with a first through hole, the side wall of the through well pipe is provided with a second through hole corresponding to the first through hole, the second through hole is located above the corresponding first through hole, the first through hole and the second through hole are aligned when the outer bushing is abutted with the annular flange; the inner surface of the outer bushing is provided with a third annular groove, the third annular groove is sleeved with a sealing ring, the sealing ring is tightly attached to the outer surface of the inner bushing, the sealing ring is provided with a third through hole, the inner surface of the inner embedding groove is provided with a fourth through hole aligned with and communicated with the third through hole, the fourth through hole is provided with a hose, one end of the hose away from the fourth through hole is communicated with the water storage cavity; when the matching block is abutted with the second blocking block, the third through hole is aligned with the first through hole.

[0021] Optionally, the inside of the water storage cavity is provided with a cover plate, the cover plate is uniformly provided with water spraying mesh holes, the inside bottom end and top end of the through well pipe are respectively provided with a lower plug and an upper plug, the upper plug is annular, the connecting rod is a hollow tubular structure, and the connecting rod is communicated with the inside of the through well pipe.

[0022] Compared with the prior art, the present application provides a large-diameter gas extraction well through well device, which has the following beneficial effects:

[0023] 1. The present application has a anti-adhesion assembly, the outer surface of the anti-adhesion assembly has a plurality of adhesion blocks, when the outside of the through-hole device encounters resistance from the sludge, the adhesion blocks can automatically retract, thereby instantaneously reducing the friction, so that the through-hole device can rotate smoothly, and the probability of sticking phenomenon appearing is reduced;

[0024] 2. The outer bushing in the present application is elastically connected below the positioning ring, when the outer bushing encounters axial resistance, the outer bushing can retreat upward by a distance, and the flushing liquid in the through-hole pipe is sprayed out of the mesh holes on the cover plate, thereby wetting the sludge, reducing the friction resistance, and enabling the through-hole device to smoothly pass through the sludge;

[0025] 3. The anti-adhesion assembly in the present application is a plurality of, and the plurality of anti-adhesion assemblies are uniformly distributed on the outside of the through-hole device, when one of the outer bushings is resisted by the sludge, the cover plate on the outer bushing can spray water outward alone, thus facilitating accurate wetting of the sludge by the flushing liquid;

[0026] 4. The connecting pipe of the present application also has a centralizer, which is beneficial to keeping the through-hole device extending into the well along the vertical direction, thereby improving the stability and safety of the through-hole operation. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic diagram of the present application;

[0028] Figure 2 is a structural schematic diagram of the through-hole pipe of the present application;

[0029] Figure 3 is a structural schematic diagram of the anti-adhesion assembly of the present application;

[0030] Figure 4 is a structural schematic diagram of the outer bushing of the present application;

[0031] Figure 5 is a structural schematic diagram of the inner bushing of the present application;

[0032] Figure 6 is a sectional view of the through-hole pipe structure of the present application;

[0033] Figure 7 is a sectional view of the anti-adhesion assembly of the present application;

[0034] Figure 8 is a back view of the adhesion block of the present application;

[0035] Figure 9 is a partial sectional view of the anti-adhesion assembly of the present application.

[0036] In the figure: 100, connecting pipe; 200, through well pipe; 201, tooth; 300, centralizer; 400, anti-adhesion assembly; 401, inner bushing; 402, outer bushing; 403, first annular groove; 404, bearing; 405, inner embedded groove; 406, adhesion block; 407, through hole; 408, driving groove; 409, driving block; 410, driving column; 411, arc-shaped groove; 412, pushing spring; 413, second annular groove; 414, clock spring; 415, first blocking block; 416, second blocking block; 417, matching block; 418, positioning ring; 419, guide column; 420, guide groove; 421, reset spring; 422, shielding ring; 423, water storage cavity; 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 technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0038] Please refer to Figure 1 - Figure 9 The present application provides a large-diameter gas extraction well through device, which comprises a connecting pipe 100, a through well pipe 200 and a centralizer 300. The upper end of the connecting pipe 100 is connected with a drill pipe. The top end of the through well pipe 200 is fixedly connected with the bottom end of the connecting pipe 100, and the bottom end of the through well pipe 200 is provided with a tooth 201. The centralizer 300 is fixedly sleeved on the outside of the connecting pipe 100, and is used for keeping the stability of the through device.

[0039] In the specific application, the top end of the connecting pipe 100 is connected with the bottom of the drill pipe by screwing, and then the through well pipe 200 is put into the well, and the through device is rotated and slowly lowered by the drill pipe, so that the inner wall of the well is polished by the tooth 201, and 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 through well pipe 200 continuously extends into the well, the sludge and debris will also continuously fall on the inner wall of the well. Part of the falling sludge can pass through the through well pipe 200 and fall into the bottom of the well, and the other part can be stuck in the gap between the outer wall of the through well pipe 200 and the well. As the sludge on the outer wall of the through well pipe 200 accumulates more and more, it will also hinder the rotation of the through well pipe 200. In order to avoid the hindering effect of the sludge on the rotation of the through well pipe 200, the anti-attachment assembly 400 is provided outside the through well pipe 200. The specific structure of the anti-attachment assembly 400 will be described in detail below:

[0041] The number of anti-attachment assemblies 400 is several, and the several anti-attachment assemblies 400 are uniformly distributed on the through well pipe 200. The anti-attachment assembly 400 includes an inner sleeve 401 and an outer sleeve 402. The inner sleeve 401 is connected with the through well pipe 200, and the outer sleeve 402 is rotatably sleeved outside the inner sleeve 401. The inner surface of the outer sleeve 402 is provided with a first annular groove 403, and the first annular groove 403 is provided with a bearing 404. The inner ring of the bearing 404 is fixedly connected with the outer surface of the inner sleeve 401. Therefore, the outer sleeve 402 is rotatably connected outside the inner sleeve 401 through the bearing 404.

[0042] It is worth mentioning that the diameter of the bottom end of the through well pipe 200 is greater than the diameter of the outer sleeve 402. Therefore, when the teeth 201 grind the inner wall of the well, there is a certain gap between the outer sleeve 402 and the inner wall of the well.

[0043] In some embodiments, the outer surface of the outer sleeve 402 is uniformly and spacedly provided with an embedded groove 405. The embedded groove 405 is uniformly distributed on the outer surface of the outer sleeve 402 in the circumferential direction. The embedded groove 405 movably has an attachment block 406. Specifically, the inner surface of the outer sleeve 402 is provided with a through hole 407 corresponding to the embedded groove 405. The through hole 407 communicates with the corresponding embedded groove 405. The inner surface of the attachment block 406 and the position opposite to the through hole 407 are provided with a driving groove 408. The outer surface of the inner sleeve 401 is provided with a driving block 409 corresponding to the through hole 407. The end of the driving block 409 passes through the through hole 407 and extends into the driving groove 408. The surface of the driving block 409 is provided with a driving column 410. The inner surface of the driving groove 408 is provided with an arc-shaped groove 411 corresponding to the driving column 410. The driving column 410 is embedded in the corresponding arc-shaped groove 411. The two ends of the arc-shaped groove 411 are different in distance from the center position of the outer sleeve 402.

[0044] In addition, the pushing spring 412 is connected between the attachment block 406 and the inner surface of the embedded groove 405, in a natural state, the pushing spring 412 is in a compressed state, and the driving column 410 is located at the inner end of the arc-shaped groove 411, and the outer surface of the attachment block 406 is flush with the outer surface of the outer sleeve 402. The inner surface of the outer sleeve 402 is provided with a second annular groove 413, and the second annular groove 413 is provided with a clock spring 414, and the inner end and the outer end of the clock spring 414 are fixedly connected with the inner sleeve 401 and the inner wall of the second annular groove 413 respectively. In a natural state, the clock spring 414 is in a twisted state, and the clock spring 414 always applies a force to the outer sleeve 402 to drive the outer sleeve 402 to rotate counterclockwise relative to the inner sleeve 401.

[0045] It should be noted that the end of the arc-shaped groove 411 close to the center of the outer sleeve 402 is defined as a starting end, and the other end is defined as a terminal end, and when the attachment block 406 is not subjected to other external forces, under the action of the pushing force of the pushing spring 412 and the clock spring 414, the driving column 410 is always located in the starting end of the arc-shaped groove 411. When the outer sleeve 402 rotates clockwise relative to the inner sleeve 401, the driving column 410 will also move from the starting end to the terminal end, and the attachment block 406 will move radially inward.

[0046] In actual application, the drill rod drives the through well pipe 200 to rotate counterclockwise, and the outer sleeve 402 has a certain gap with the inner wall of the well, and when the through well pipe 200 normally rotates, the outer sleeve 402 and the inner wall of the well will not produce friction, so the through well pipe 200 will not be hindered by the well wall. When the slag between the outer part of the through well pipe 200 and the well wall accumulates more and more, the slag will hinder the rotation of the outer sleeve 402, and when the resistance is greater than the torsion of the clock spring 414, the outer sleeve 402 will rotate clockwise relative to the inner sleeve 401, and then the attachment block 406 will shrink inward, so as to instantaneously reduce the friction between the outer sleeve 402 and the slag, which is helpful for the normal rotation of the through well pipe 200 to pass through the slag.

[0047] In some embodiments of the present application, the outer surface of the inner sleeve 401 is provided with a first blocking block 415 and a second blocking block 416 at intervals in the circumferential direction, the first blocking block 415 and the second blocking block 416 are 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 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 when the outer sleeve 402 rotates clockwise relative to the inner sleeve 401 by a certain angle, the matching block 417 abuts against the second blocking block 416, at this time, the outer sleeve 402 cannot continue to rotate, and at this time, the driving column 410 is located in the terminal end of the arc-shaped groove 411. Therefore, the first blocking block 415 and the second blocking block 416 are used to limit the rotation amplitude of the outer sleeve 402.

[0048] In another embodiment of the present application, the anti-attachment assembly 400 further comprises positioning rings 418 fixedly sleeved on the outside of the through well pipe 200, the positioning rings 418 are located above the corresponding inner bushings 401, and the bottom surface of the positioning ring 418 is provided with a guide column 419, the top surface of the inner bushing 401 is provided with a guide groove 420 for inserting the guide column 419, and the outside of the guide column 419 is further sleeved with a reset spring 421, the two ends of the reset spring 421 are respectively abutted with the bottom surface of the positioning ring 418 and the top surface of the inner bushing 401, in the natural state, the reset spring 421 is in the compressed state, and the bottom end of the inner bushing 401 is abutted with the positioning ring 418 located below. Therefore, the inner bushing 401 is equivalent to being movably sleeved on the outside of the through well pipe 200, and the inner bushing 401 is in sliding connection with the guide column 419, and the inner bushing 401 can vertically slide along the guide column 419. The reset spring 421 is in the compressed state, therefore, the reset spring 421 always applies a downward pushing force to the inner bushing 401, so that the bottom end of the inner bushing 401 is abutted with the positioning ring 418 located below, it should be noted that the inner bushing 401 located at the lowermost is abutted with the upper end of the through well pipe 200.

[0049] Further, the outside of the positioning ring 418 is fixedly sleeved 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 outside of the corresponding outer bushing 402, and the outer surface of the outer bushing 402 has a small gap with the inner surface of the shielding ring 422, which allows the muck to not enter the top and bottom space of the outer bushing 402, and the shielding ring 422 does not hinder the outer bushing 402 from sliding up and down.

[0050] It should be noted that the upper end of the bottom end of the through well pipe 200 is also provided with a shielding ring 422, which is sleeved on the bottom outside of the outer bushing 402 located at the lowermost, which prevents the muck from entering between the outer bushing 402 located at the lowermost and the upper end of the bottom end of the through well pipe 200.

[0051] The structure of the attachment block 406, the inner bushing 401 and the outer bushing 402 will be further described below:

[0052] The outer surface of the attachment block 406 is provided with a water storage cavity 423, and the bottom surface of the positioning ring 418 is fixedly provided with an annular flange 424, in the natural state, the top surface of the outer bushing 402 is not in contact with the annular flange 424, and the water storage cavity 423 is not communicated with the inside of the through well pipe 200; when the top surface of the outer bushing 402 is abutted with the annular flange 424, and the cooperation block 417 is abutted with the second blocking block 416, the water storage cavity 423 is communicated with the inside of the through well pipe 200.

[0053] Specifically, the side wall of the inner sleeve 401 is provided with a first through hole 425, the side wall of the through well pipe 200 is provided with a second through hole 426 corresponding to the first through hole 425, the second through hole 426 is located above the corresponding first through hole 425, when the outer sleeve 402 abuts against the annular flange 424, the first through hole 425 and the second through hole 426 are aligned; the inner surface of the outer sleeve 402 is provided with a third annular groove 427, the third annular groove 427 is sleeved with a sealing ring 428, the sealing ring 428 is tightly attached to 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 aligned with and communicating with the third through hole 429, the fourth through hole 430 is provided with a hose 431, one end of the hose 431 away from the fourth through hole 430 is communicated with the water storage cavity 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, the inside of the water storage cavity 423 is provided with a cover plate 432, the cover plate 432 is uniformly provided with water spraying mesh holes, the inside bottom end and top end of the through well pipe 200 are respectively provided with a lower plug and an upper plug, the upper plug is annular, the connecting pipe 100 is a hollow tubular structure, the connecting pipe 100 is communicated with the inside of the through well pipe 200.

[0055] In summary, when neither the adhesion block 406 nor the outer sleeve 402 is subjected to external force, that is, in the initial state, the matching block 417 abuts against the first blocking block 415, and the outer surface of the adhesion block 406 and the outer surface of the outer sleeve 402 are flush, at this time, the water storage cavity 423 and the inside of the through well pipe 200 are not communicated. When the outer surface of the outer sleeve 402 and the well wall accumulate more and more slag, the slag will hinder the normal rotation of the outer sleeve 402, causing the outer sleeve 402 to rotate clockwise compared to the inner sleeve 401, so that the matching block 417 abuts against the second blocking block 416, and when the outer sleeve 402 abuts against the annular flange 424, at this time, 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, so that the water storage cavity 423 and the inside of the through well pipe 200 are communicated.

[0056] In the actual application process of the embodiment, the worker can inject flushing liquid into the through well pipe 200 through the drill rod, the flushing liquid can use water, because in the natural state, the water storage cavity 423 and the inside of the through well pipe 200 are not communicated, therefore the flushing liquid in the through well pipe 200 is always in a high pressure state, and the flushing liquid cannot overflow.

[0057] As the through pipe 200 continues to drill down, the teeth 201 can continue to grind the inner wall of the drill hole, causing the inner wall of the drill hole to gradually change from irregular to smooth. During the grinding of the through pipe, a small amount of sludge on the inner wall of the drill hole above the through pipe 200 will continue to fall. Part of the falling sludge can pass through the through pipe 200 and fall into the bottom end of the drill hole, and the other part is easy to be stuck between the through pipe 200 and the inner wall of the drill hole. As the sludge accumulates more and more, the sludge will hinder the rotation of the outer sleeve 402. When the resistance is greater than the torsion of the clockwork spring 414, the outer sleeve 402 can rotate clockwise relative to the inner sleeve 401 by a certain angle, causing the attachment block 406 to retract inward, thereby instantaneously reducing the friction between the attachment block 406 and the sludge, allowing the through pipe 200 to smoothly pass through the sludge.

[0058] If the attachment block 406 retracts inward and still cannot get rid of the sludge, as the through pipe 200 moves downward, the outer sleeve 402 cannot move downward synchronously with the through pipe 200 under the resistance of the sludge until the top end of the outer sleeve 402 and the annular flange 424 abut. At this time, the water storage cavity 423 and the inside of the through pipe 200 are communicated, and the water flow is ejected from the mesh holes on the cover plate 432 to wet and soften the sludge, thereby improving the ability of the through pipe 200 to pass through the sludge.

[0059] It is worth mentioning that in the present embodiment, there are several anti-attachment assemblies 400, and the position of the sludge attachment is not determined. When the sludge hinders the rotation of a certain outer sleeve 402, the water flow will also be ejected from the corresponding outer sleeve 402, and the remaining normally rotating anti-attachment assemblies 400 will not spray water outward, thus being conducive to concentrating the water flow on the sludge at the corresponding position, improving the spraying accuracy, and being conducive to maintaining the spraying intensity of the water flow.

[0060] It should be noted that in the present text, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0061] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A through-the-casing device for a large-diameter gas extraction well, characterized in that, The utility model relates to a kind of well pipe, comprising: Connecting pipe (100), the upper end of the connecting pipe (100) is used to be connected with drill pipe; Well pipe (200), the top end of the well pipe (200) is fixedly connected with the bottom end of the connecting pipe (100), and the bottom end of the well pipe (200) is provided with a tooth (201); Centralizer (300), the centralizer (300) is fixedly sleeved on the outside of the connecting pipe (100); Wherein, the outside of the well pipe (200) is sleeved with anti-attachment component (400), the number of the anti-attachment component (400) is several, and several anti-attachment components (400) are evenly distributed on well pipe (200), the anti-attachment component (400) includes inner sleeve (401) and outer sleeve (402), the inner sleeve (401) is connected with the well pipe (200), the outer sleeve (402) is rotatably sleeved on the outside of inner sleeve (401), the outer surface of the outer sleeve (402) is evenly spaced and provided with inner embedding groove (405), the inner embedding groove (405) is movably provided with attachment block (406); The inner surface of the outer sleeve (402) is provided with through hole (407) corresponding to the inner embedding groove (405), the through hole (407) is communicated with the corresponding inner embedding groove (405), the inner surface of the attachment block (406) and the position opposite the through hole (407) are provided with driving groove (408), the outer surface of the inner sleeve (401) is provided with driving block (409) corresponding to the through hole (407), the end of the driving block (409) passes through the through hole (407) and extends into the driving groove (408), the surface of the driving block (409) is provided with driving column (410), the inner surface of the driving groove (408) is provided with arc-shaped groove (411) corresponding to the driving column (410), the driving column (410) is embedded in the corresponding arc-shaped groove (411), the two ends of the arc-shaped groove (411) are different in distance from the center position of the outer sleeve (402);When the outer sleeve (402) rotates clockwise relative to the inner sleeve (401), the attachment block (406) makes inward contraction movement along the radial direction.

2. A large-diameter gas extraction well through-well device according to claim 1, characterized in that: The inner surface between the attachment block (406) and the inner embedding groove (405) is connected with push spring (412), in natural state, the push spring (412) is in compressed state, and the driving column (410) is located at the inner end of the arc-shaped groove (411), the outer surface of the attachment block (406) is flush with the outer surface of the outer sleeve (402).

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

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

5. A large-diameter gas extraction well through well device according to claim 4, characterized in that: The outer surface of the inner bushing (401) is provided with a first blocking block (415) and a second blocking block (416) at intervals in the circumferential direction, the first blocking block (415) and the second blocking block (416) are 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 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 clock spring (414) is in a tightened state.

6. A large-diameter gas extraction well through well device according to claim 5, characterized in that: The anti-attachment assembly (400) further comprises a positioning ring (418), the positioning ring (418) is fixedly sleeved on the outside of the open well pipe (200), the positioning ring (418) is located above the corresponding inner bushing (401), and the bottom surface of the positioning ring (418) is provided with a guide column (419), the top surface of the inner bushing (401) is provided with a guide groove (420) for inserting the guide column (419), and the outside of the guide column (419) is further sleeved with a reset spring (421), the two ends of the reset spring (421) abut against the bottom surface of the positioning ring (418) and the top surface of the inner bushing (401) respectively, and in a natural state, the reset spring (421) is in a compressed state, and the bottom end of the inner bushing (401) abuts against the positioning ring (418) located below.

7. A large-diameter gas extraction well through well device according to claim 6, characterized in that: The outside of the positioning ring (418) is fixedly sleeved 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 outside of the corresponding outer bushing (402).

8. A large-diameter gas extraction well through well device according to claim 7, characterized in that: The outer surface of the attachment block (406) is provided with a water storage cavity (423), 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 bushing (402) is not in contact with the annular flange (424), and the water storage cavity (423) is not communicated with the inside of the open well pipe (200); when the top surface of the outer bushing (402) abuts against the annular flange (424) and the matching block (417) abuts against the second blocking block (416), the water storage cavity (423) is communicated with the inside of the open well pipe (200).

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

10. The large-diameter gas extraction well through-well device according to claim 8, characterized in that: The inside of the water storage cavity (423) is provided with a cover plate (432), the cover plate (432) is uniformly provided with water spraying mesh holes, the inside bottom end and top end of the well pipe (200) are respectively provided with a lower plug and an upper plug, the upper plug is annular, the connecting pipe (100) is a hollow tubular structure, the connecting pipe (100) is communicated with the inside of the well pipe (200).

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