A structure of a drilling elevator for downhole drilling

Abstract

The application provides a hanger structure for downhole drilling, which comprises a main frame body, a hinged leaf plate connected to the outer side of the main frame body, the leaf plate being used for closing an opening, a first adjusting unit slidingly arranged in the main frame body, a second adjusting unit slidingly arranged in the leaf plate, the first adjusting unit being capable of being clamped with the second adjusting unit, a bushing structure for abutting against a drill rod being arranged on the inner side of the main frame body and the leaf plate, and each bushing structure being slidingly connected to the inner side of the corresponding first adjusting unit or second adjusting unit. The hanger structure for downhole drilling has the first adjusting block and the second adjusting block, the first inclined groove in the inner side of the first adjusting block, the second inclined groove in the inner side of the second adjusting block and the triangular block outside the corresponding arc-shaped block, which are used for extruding the triangular block outside the corresponding arc-shaped block, so that the vertical sliding is converted into the radial displacement of the arc-shaped block, the expansion and contraction of the inner diameter of the hanger are completed, the hoisting operation of the drill rod of different specifications is adapted, the frequency of replacing the hanger is reduced, the labor intensity of workers is reduced, and the work efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of drilling equipment, and in particular relates to a hoisting structure for downhole drilling. Background Technology

[0002] In the downhole drilling operations of petroleum, geology, and mining, the hoisting, transportation, docking, and lowering of drill pipes are core processes. The hoisting clamp is a special tool for holding drill pipes and cooperating with lifting equipment to complete the hoisting and unloading of drill pipes, which directly determines the efficiency and safety of downhole drilling operations.

[0003] Currently, the mainstream tooling used in drilling pipe tripping operations consists of two types: side-opening valve tubing clamps and fixed clamps. Side-opening valve clamps rely on side-opening valves and alignment pins to close and lock the pipe fittings. The clamp size of this type of clamp is a cast-in-place fixed structure, and a single clamp can only be matched with a single outer diameter drill pipe for lifting operations. During drilling operations at the drilling site, multiple specifications of drill pipe are usually used together, requiring multiple clamps of different models to be used in rotation. During wellhead operations, it is necessary to frequently change the matching clamps, which is a cumbersome disassembly and replacement process, with a large amount of manual labor and low efficiency in drill pipe loading and unloading operations. Summary of the Invention

[0004] In view of this, the present invention aims to propose a hoisting structure for downhole drilling to solve the problems of traditional side-opening valve-type hoists being able to match only a single outer diameter drill pipe, requiring frequent replacement of matching hoists for hoisting operations in drilling sites where multiple specifications of drill pipe are used, and the cumbersome hoisting and disassembly process, resulting in high labor intensity and low work efficiency for workers.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] A downhole drilling clamp structure includes a main frame, which is an open annular structure. A hinge is hinged to the outer side of the main frame to close the opening. A locking device is provided on the hinge to limit the relative position of the main frame and the hinge. A first adjustment unit is slidably disposed inside the main frame, and a second adjustment unit is slidably disposed inside the hinge. The first adjustment unit can be interlocked with the second adjustment unit. Bushing structures for abutting drill pipe are provided on the inner sides of both the main frame and the hinge. Each bushing structure is slidably connected to the inner side of the corresponding first adjustment unit or second adjustment unit. The first adjustment unit and the second adjustment unit are respectively used to limit the relative position of the corresponding bushing structure on the main frame or the hinge.

[0007] Furthermore, the first adjustment unit includes a first adjustment block, with first slots at both ends of the first adjustment block, and both ends of the second adjustment unit being able to be engaged in the corresponding first slots. A first inclined groove is provided on the lower inner side of the first adjustment block, and a first sliding groove is provided along the axial direction at the bottom of the first inclined groove. One end of the corresponding bushing structure is located in the first inclined groove and is slidably connected in the first sliding groove. A first fixing part is provided on the outer side of the first adjustment block to limit the relative position of the first adjustment block in the main frame body.

[0008] Furthermore, the first fixing part includes a handle, which is fixedly installed on the outside of the first adjusting block. A first mounting groove is provided on one side of the handle, and a first locking block is slidably disposed in the first mounting groove. One end of the first locking block is elastically connected to the bottom of the first mounting groove by a first spring, and the other end of the first locking block can be locked onto the main frame.

[0009] Furthermore, the second adjustment unit includes a second adjustment block, with first protrusions at both ends of the second adjustment block. Each first protrusion can be engaged in a corresponding first slot. A second inclined groove is provided on the lower inner side of the second adjustment block. A second sliding groove is provided at the bottom of the second inclined groove along the axial direction. One end of the corresponding bushing structure is located in the second inclined groove and slides with the second sliding groove. A first through hole is provided on the second adjustment block. A positioning rod is slidably arranged in the first through hole. One end of the positioning rod is elastically connected to the outside of the second adjustment block by a second spring. The other end of the positioning rod can be inserted into the hinge.

[0010] Furthermore, the bushing structure includes an arc-shaped block with a rounded corner at the upper inner side and a triangular block at the middle outer side. The triangular block is located in a first or second inclined groove, and the inclined surface of the triangular block fits into the bottom of the corresponding first or second inclined groove. A first slider is provided on the inclined surface of the triangular block, and the outer periphery of the first slider is slidably connected to the corresponding first or second sliding groove. A guide rod is provided at the lower outer side of the arc-shaped block, and the other end of the guide rod is slidably connected to the main frame or hinge.

[0011] Furthermore, the main frame body is provided with a first mounting cavity, the first adjusting block is slidably disposed in the first mounting cavity, the inner side of the main frame body is provided with a first through groove, the first through groove is connected to the first inclined groove, the outer side of the main frame body is provided with a second through groove, one side of the outer wall of the second through groove is provided with a plurality of second slots along the axial direction, the periphery of the first fixing part is located in the second through groove, the execution end of the first fixing part can be engaged in the corresponding second slot, the two sides of the opening end of the main frame body are respectively provided with first clearance grooves for avoiding the first protrusion, and two lifting lugs are provided opposite to each other at the upper end of the main frame body.

[0012] Furthermore, the hinge has a second mounting cavity, the second adjusting block is slidably disposed in the second mounting cavity, the inner side of the hinge has a third through groove, the third through groove is connected to the second inclined groove, one side of the outer wall of the third through groove has a plurality of insertion holes evenly distributed along the axial direction, each insertion hole corresponds to a second slot, one end of the positioning rod can be inserted into the corresponding insertion hole, the outer side of the second mounting cavity has a fourth through groove, and the other end of the positioning rod is located in the fourth through groove.

[0013] Compared with the prior art, the downhole drilling hoist structure of the present invention has the following advantages:

[0014] (1) The downhole drilling hoist structure of the present invention uses a first adjusting block and a second adjusting block. The first inclined groove on the inner side of the first adjusting block and the second inclined groove on the inner side of the second adjusting block squeeze the triangular block on the outer side of the corresponding arc block, converting the vertical sliding into the radial displacement of the arc block, thereby completing the expansion and contraction of the inner diameter of the hoist, adapting to the hoisting operation of drill pipes of different specifications, reducing the frequency of hoist replacement, reducing the labor intensity of workers, and improving work efficiency.

[0015] (2) The hoisting structure for downhole drilling described in this invention has a second slot on the main frame corresponding to the insertion hole of the hinge to form a multi-level gear adjustment structure. Combined with the first fixing part and the bidirectional elastic self-locking structure of the positioning rod, it can lock any diameter adjustment position, adapt to the hoisting operation of drill rods of different specifications, and improve the adaptability of the device.

[0016] (3) The hoisting structure for downhole drilling described in this invention, wherein the first adjustment unit and the second adjustment unit are linked by the first slot and the first protrusion to achieve synchronous action, and together with the sliding groove and the guide rod to limit the bushing structure in both directions, forming a multi-point clamping structure, ensuring the coaxiality of the drill pipe during hoisting, preventing the drill pipe from falling off eccentrically, and improving the safety of drill pipe hoisting operations. Attached Figure Description

[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 This is a schematic diagram of the overall structure of a hoisting clamp structure for downhole drilling according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the first adjustment unit according to an embodiment of the present invention;

[0020] Figure 3 This is an exploded structural diagram of the first fixing part according to an embodiment of the present invention;

[0021] Figure 4This is an exploded view of the second adjustment unit according to an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the bushing structure described in an embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the main frame structure according to an embodiment of the present invention;

[0024] Figure 7 This is a partial cross-sectional structural diagram of the loose-leaf structure described in an embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram of the assembly of the main frame, hinges, and locks according to an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Main frame; 11. First mounting cavity; 12. First through slot; 13. Second through slot; 14. Second slot; 15. First clearance slot; 16. Lifting lug; 2. Hinge; 21. Second mounting cavity; 22. Third through slot; 23. Insertion hole; 24. Fourth through slot; 3. First adjustment unit; 31. First adjustment block; 32. First slot; 33. First inclined slot; 34. First fixing part; 341. Handle; 342. First mounting slot; 3 43. First locking block; 34. First spring; 35. First slide groove; 4. Second adjusting unit; 41. Second adjusting block; 42. First protrusion; 43. Second inclined groove; 44. First through hole; 45. Positioning rod; 46. Second slide groove; 47. Second spring; 5. Bushing structure; 51. Arc-shaped block; 52. Triangular block; 53. First slider; 54. Guide rod; 6. Lock; 61. Door latch; 62. Limiting block; 63. Latch groove. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0029] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] like Figure 1As shown, a hoist structure for downhole drilling includes a main frame 1, which is an open annular structure. One side of the open end of the main frame 1 is hinged to a hinge 2, which is used to close the opening. A lock 6 is provided on the hinge 2 to limit the relative position of the main frame 1 and the hinge 2. After the main frame 1 and the hinge 2 are closed, they form a complete annular structure. The hinged connection between the main frame 1 and the hinge 2, along with the lock 6, allows for quick opening, closing, and locking, facilitating the loading and unloading of drill pipes and improving work efficiency. A first adjustment unit 3 is slidably disposed inside the main frame 1, and a second adjustment unit 4 is slidably disposed inside the hinge 2. The first adjustment unit 3 and the second adjustment unit 4 can be interlocked with each other. The main frame 1 has a first adjustment unit 3 and the hinge 2 has a second adjustment unit 4. The two can be interlocked to form an overall positioning, which improves the structural closure stability. Multiple bushing structures 5 are disposed on the inner side of the main frame 1 and one bushing structure 5 is disposed on the inner side of the hinge 2. Each bushing structure 5 is slidably connected to the inner side of the corresponding first adjustment unit 3 or second adjustment unit 4. The first adjustment unit 3 and the second adjustment unit 4 are used to limit the relative position of the corresponding bushing structure 5 on the main frame 1 or the hinge 2. The bushing structure 5 is slidably assembled inside the adjustment unit, and a multi-point clamping structure is formed by setting multiple bushing structures 5 in the main frame body and bushing structures 5 on the inner side of the hinge. The positions of multiple bushing structures 5 are adjusted and limited by the first adjustment unit 3 and the second adjustment unit 4, which can adapt to drill rods of different outer diameter specifications, improve the applicability of the device. The drill rod is existing technology, such as the extended drill rod tube body described in the patent patent with publication number CN121345444A entitled "An Extended Drill Rod with Thickened Middle and Manufacturing Method of Tube Body". Other devices in the prior art can also be selected to meet the requirements of this application. The staff can configure it themselves.

[0033] like Figure 2As shown, the first adjustment unit 3 includes a first adjustment block 31, which is slidably disposed within the main frame 1. The first adjustment block 31 has first slots 32 at both ends. The two ends of the second adjustment unit 4 can be engaged with the corresponding first slots 32. The engagement of the first slots 32 at both ends of the first adjustment block 31 with the second adjustment unit 4 enhances the connection strength between the main frame 1 and the hinge 2 after closure. Furthermore, adjusting the first adjustment block 31 drives the second adjustment block 41 to move synchronously, causing the multiple bushing structures 5 slidably connected to the inner sides of the first and second adjustment units 4 to move radially synchronously, facilitating the centering of the drill rod. Multiple first inclined grooves 33 are evenly distributed on the lower inner side of the first adjustment block 31. Each first inclined groove... Each inclined groove 33 has a first sliding groove 35 along its axial direction at its bottom. One end of the corresponding bushing structure 5 is located in the corresponding first inclined groove 33 and slides in cooperation with the corresponding first sliding groove 35. The first inclined groove 33, the first sliding groove 35, and the corresponding bushing structure 5 slide in adaptation. The first inclined groove 33 guides the bushing structure 5 to achieve radial adjustment and precisely grip the drill rod. The first sliding groove 35 limits the sliding trajectory of the bushing structure 5, preventing the bushing structure 5 from shifting and ensuring the stability of the bushing structure 5's sliding. Two first fixing parts 34 are arranged opposite each other on the outer side of the first adjusting block 31. The execution end of each first fixing part 34 can be locked onto the main frame 1. The first fixing part 34 is used to limit the relative position of the first adjusting block 31 within the main frame 1. The first fixing part 34 can lock the position of the first adjusting block 31, fixing the position of the first adjusting block 31 after adjustment, ensuring that the first adjusting block 31 will not shift during operation. By setting two first fixing parts 34, the positioning strength of the first adjusting block 31 can be improved, maintaining the stability of the device hoisting operation.

[0034] like Figure 3 As shown, the first fixing part 34 includes a handle 341, which is fixedly installed on the outside of the first adjusting block 31. The handle 341 facilitates manual pushing and pulling to adjust the first adjusting block 31, making the adjustment operation simple and convenient. A first mounting groove 342 is provided on one side of the handle 341, and a first locking block 343 is slidably disposed within the first mounting groove 342. One end of the first locking block 343 is elastically connected to the bottom of the first mounting groove 342 via a first spring 344, and the other end of the first locking block 343 can be engaged with the main frame 1. Under the elastic force of the first spring 344, the first locking block 343 automatically engages with the main frame 1, achieving elastic self-locking. No additional locking accessories are required, and the locking and unlocking steps are simple, improving work efficiency.

[0035] like Figure 4As shown, the second adjustment unit 4 includes a second adjustment block 41, which is slidably disposed within the hinge 2. Each end of the second adjustment block 41 has a first protrusion 42, which can be engaged in a corresponding first slot 32. The first protrusions 42 at both ends of the second adjustment block 41 precisely engage with the first slots 32, thereby adjusting the position of the first adjustment block 31 while simultaneously driving the second adjustment block 41 to move synchronously. This ensures the synchronicity of the displacements of the first and second adjustment blocks 41, further enabling synchronous radial displacement of multiple bushing units 5. This allows for the expansion or contraction of the diameter of the annular structure formed by the main frame 1 and the hinge 2, adapting to the hoisting of drill pipes of different specifications and improving the adaptability of the device. The lower inner side of the second adjusting block 41 is provided with a second inclined groove 43, and the bottom of the second inclined groove 43 is provided with a second sliding groove 46 along the axial direction. One end of the corresponding bushing structure 5 is located in the second inclined groove 43 and slides in cooperation with the second sliding groove 46. The second inclined groove 43 and the second sliding groove 46 slide in cooperation with the corresponding bushing structure 5. The second inclined groove 43 guides the bushing structure 5 to achieve radial adjustment. Together with the bushing structure 5 provided on the inner side of the main frame 1, they form a multi-point circumferential structure to ensure the stability of the drill rod's central axial direction and prevent the drill rod from deviating. The second sliding groove 46 limits the sliding trajectory of the bushing structure 5 to avoid the bushing structure 5 from deviating and to ensure the stability of the bushing structure 5's sliding. The second adjusting block 41 is provided with a first through hole 44. A positioning rod 45 is slidably arranged in the first through hole 44. One end of the positioning rod 45 is elastically connected to the outside of the second adjusting block 41 through a second spring 47, and the other end of the positioning rod 45 can be inserted into the hinge 2. The positioning rod 45, in conjunction with the second spring 47, elastically inserts into the hinge 2, which can lock the position of the second adjusting block 41, preventing the second adjusting block 41 from shifting during operation and causing the drill rod to fall off, thus improving operational safety.

[0036] like Figure 5 As shown, the bushing structure 5 includes an arc-shaped block 51. The upper inner end of the arc-shaped block 51 is provided with a rounded corner. The rounded corner can abut against the outer periphery of the drill pipe female joint provided at the end of the extended drill pipe body. By providing the rounded corner, the rigid contact damage to the drill pipe is reduced, and the service life of the drill pipe is extended. A triangular block 52 is provided on the outer middle of the arc-shaped block 51. The triangular block 52 is located in the first inclined groove 33 or the second inclined groove 43. The inclined surface of the triangular block 52 is in contact with the bottom of the corresponding first inclined groove 33 or the second inclined groove 43. A first slider 53 is provided on the inclined surface of the triangular block 52. The outer periphery of the first slider 53 is slidably connected in the corresponding first sliding groove 35 or the second sliding groove 46. The triangular block 52 is in contact with the bottom inclined surface of the first inclined groove 33 or the second inclined groove 43, and the first slider 53 is in slidable contact with the first sliding groove 35 or the second sliding groove 46. The vertical displacement of the first adjusting block 31 and the second adjusting block 41 can be converted into the radial displacement of the arc-shaped block 51. During adjustment, the multiple bushing units 5 have high consistency in operation.

[0037] A guide rod 54 is provided on the lower outer side of the arc-shaped block 51, and the other end of the guide rod 54 is slidably connected to the main frame 1 or the hinge 2. The guide rod 54 provides secondary guidance and limitation for the arc-shaped block 51, further constrains the movement trajectory of the bushing, prevents the bushing from tilting, ensures clamping accuracy, and improves the vertical bearing capacity of the arc-shaped block 51.

[0038] like Figure 6 As shown, the main frame 1 has a first mounting cavity 11, in which a first adjusting block 31 is slidably disposed. The first mounting cavity 11 provides a stable sliding space for the first adjusting block 31, reducing the size and weight of the equipment. Multiple first through slots 12 are evenly distributed circumferentially along the inner side of the main frame 1. Each first through slot 12 connects to a corresponding first inclined slot 33. One end of the corresponding bushing structure 5 slides with the first adjusting unit 3 through the corresponding first through slot 12. The first through slot 12 provides guidance for the radial movement of the bushing structure 5. One end of the corresponding bushing structure 5 is located within the corresponding first through slot 12. Two first adjusting blocks 33 are arranged opposite each other on the outer side of the main frame 1. The two through slots 13 each have multiple second slots 14 along their axial direction on one side. Two first fixing parts 34 are located in their respective second through slots 13, and the actuating end of each first fixing part 34 can be engaged in its corresponding second slot 14. The two through slots 13 and multiple sets of second slots 14 can achieve multi-level size adjustment, adapting to various specifications of drill pipes for hoisting. The two sides of the open end of the main frame 1 are provided with first clearance slots 15, which are used to avoid the first protrusion 42. The first clearance slots 15 avoid the movement interference of the first protrusion 42, ensuring smooth opening, closing, and engaging actions. The upper ends of the main frame 1 are provided with a lifting lug 16 on each side. The lifting lug 16 provides a hoisting force point for the entire hoisting clamp, meeting the load-bearing requirements of drilling hoisting operations.

[0039] like Figure 7 As shown, the hinge 2 has a second mounting cavity 21, and a second adjusting block 41 is slidably disposed in the second mounting cavity 21. The inner side of the hinge 2 has a third through groove 22, which connects to the second inclined groove 43. One end of the corresponding bushing structure 5 is located in the third through groove 22. The second mounting cavity 21 and the third through groove 22 provide movement space for the second adjusting block 41 and the bushing structure 5, respectively. The structure is the same as that of the main frame 1, which improves the consistency and synchronization of the device operation. Multiple inserts are evenly distributed along the axial direction on one side of the outer wall of the third through groove 22. Hole 23, each corresponding to a second slot 14. One end of the positioning rod 45 can be inserted into the corresponding hole 23. Multiple sets of holes 23 correspond one-to-one with the second slots 14. The positioning rod 45 can be matched with different gears to complete the locking. The gears on both sides are adjusted synchronously, and the drill rod clamping concentricity is high. A fourth through groove 24 is provided on the outer side of the second mounting cavity 21. The other end of the positioning rod 45 is located in the fourth through groove 24. The end of the positioning rod 45 is exposed in the fourth through groove 24, which is convenient for manual insertion and removal operation. The unlocking and locking actions are intuitive and convenient.

[0040] like Figure 8 As shown, the lock 6 includes a latch 61 and a limiting block 62. The latch 61 is hinged to the outside of the hinge 2, and the limiting block 62 is fixedly installed on the outside of the main frame 1. The limiting block 62 is provided with a latch groove 63, and the latch 61 can be engaged in the latch groove 63. The latch 61 is hinged to the hinge 2 and can be rotatably engaged in the latch groove 63 of the limiting block 62, which quickly closes and locks the opening of the lifting clamp, preventing the hinge 2 from separating from the main frame 1 during the lifting operation and causing the drill rod to detach, thus improving production safety.

[0041] The working process of a hoisting structure for downhole drilling:

[0042] Device opening and closing and rod preparation: Rotate hinge 2 to open the opening of the main frame 1, and place the drill rod to be hoisted into the area enclosed by the main frame 1 and hinge 2; then close hinge 2, rotate the latch 61 of the lock 6 to make it engage with the latch groove 63 of the limit block 62, and complete the overall locking of the main frame 1 and hinge 2.

[0043] Specification adjustment and gear alignment: Pull up the positioning rod 45 on the second adjusting block 41 to disengage it from the corresponding insertion hole 23, hold the handle 341 of the first fixing part 34, press the first locking block 343 into the first mounting groove 342, slide the handle 341 along the second through groove 13 to drive the first adjusting block 31 to move, and further drive the second adjusting block 41, which is locked to the first adjusting block 31, to move synchronously.

[0044] After selecting the adjustment gear according to the outer diameter of the drill rod, release the handle 341. The first locking block 343 is locked into the corresponding second locking groove 14 of the main frame 1 under the elastic force of the first spring 344, locking the position of the first adjusting block 31. At the same time, the positioning rod 45 is inserted into the corresponding insertion hole 23 to complete the locking of the second adjusting block 41.

[0045] Bushing radial clamping and positioning: When the first adjusting block 31 slides along the first mounting cavity 11 of the main frame 1 and the second adjusting block 41 slides along the second mounting cavity 21 of the hinge 2, the first inclined groove 33 and the second inclined groove 43 on their inner sides simultaneously push the bushing structure 5 to move: the triangular block 52 on the outer side of the arc block 51 fits against the slope of the corresponding first inclined groove 33 and the second inclined groove 43, and the first slider 53 slides along the corresponding first sliding groove 35 and the second sliding groove 46, converting the sliding force into a radial clamping force, driving the arc block 51 to move towards the center simultaneously; the guide rod 54 on the outer side of the arc block 51 slides and limits along the main frame 1 and the hinge 2 to ensure the stability of the movement trajectory. Finally, multiple sets of arc blocks 51 hug and clamp the drill rod, and the rounded corners at the upper end of the arc block 51 avoid the drill rod joint to prevent rigid collision damage to the drill rod.

[0046] Lifting and rod unloading and resetting: The lifting equipment can be connected through the lifting lug 16 at the upper end of the main frame 1 to carry out the lifting and transfer operation of the drill rod; after the operation is completed, the latch 61 is opened and the hinge 2 is turned to take out the drill rod, completing a single operation cycle.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hoisting structure for downhole drilling, comprising a main frame (1), the main frame (1) being an open annular structure, a hinge (2) hinged to the outer side of the main frame (1), the hinge (2) being used to close the opening, and a lock (6) provided on the hinge (2) for limiting the relative position of the main frame (1) and the hinge (2), characterized in that: A first adjustment unit (3) is slidably arranged inside the main frame (1), and a second adjustment unit (4) is slidably arranged inside the hinge (2). The first adjustment unit (3) can be engaged with the second adjustment unit (4). The inner sides of the main frame (1) and the hinge (2) are provided with bushing structures (5) for abutting the drill rod. Each bushing structure (5) is slidably connected to the inner side of the corresponding first adjustment unit (3) or second adjustment unit (4). The first adjustment unit (3) and the second adjustment unit (4) are respectively used to limit the relative position of the corresponding bushing structure (5) on the main frame (1) or the hinge (2).

2. The hoisting clamp structure for downhole drilling according to claim 1, characterized in that: The first adjustment unit (3) includes a first adjustment block (31). The two ends of the first adjustment block (31) are respectively provided with first slots (32). The two ends of the second adjustment unit (4) can be respectively engaged in the corresponding first slots (32). The lower inner side of the first adjustment block (31) is provided with a first inclined groove (33). The bottom of the first inclined groove (33) is provided with a first sliding groove (35) along the axial direction. One end of the corresponding bushing structure (5) is located in the first inclined groove (33) and is slidably connected in the first sliding groove (35). The outer side of the first adjustment block (31) is provided with a first fixing part (34) for limiting the relative position of the first adjustment block (31) in the main frame (1).

3. The hoisting structure for downhole drilling according to claim 2, characterized in that: The first fixing part (34) includes a handle (341), which is fixedly installed on the outside of the first adjusting block (31). A first mounting groove (342) is provided on one side of the handle (341). A first locking block (343) is slidably arranged in the first mounting groove (342). One end of the first locking block (343) is elastically connected to the bottom of the first mounting groove (342) through a first spring (344), and the other end of the first locking block (343) can be locked onto the main frame (1).

4. The hoisting structure for downhole drilling according to claim 2, characterized in that: The second adjustment unit (4) includes a second adjustment block (41). The two ends of the second adjustment block (41) are respectively provided with first protrusions (42). Each first protrusion (42) can be engaged in the corresponding first slot (32). The lower inner side of the second adjustment block (41) is provided with a second inclined groove (43). The bottom of the second inclined groove (43) is provided with a second sliding groove (46) along the axial direction. One end of the corresponding bushing structure (5) is located in the second inclined groove (43) and slides with the second sliding groove (46). The second adjustment block (41) is provided with a first through hole (44). A positioning rod (45) is slidably arranged in the first through hole (44). One end of the positioning rod (45) is elastically connected to the outside of the second adjustment block (41) through a second spring (47). The other end of the positioning rod (45) can be inserted into the hinge (2).

5. The hoisting clamp structure for downhole drilling according to claim 4, characterized in that: The bushing structure (5) includes an arc-shaped block (51), with a rounded corner on the upper inner side of the arc-shaped block (51) and a triangular block (52) in the middle outer side of the arc-shaped block (51). The triangular block (52) is located in the first inclined groove (33) or the second inclined groove (43). The inclined surface of the triangular block (52) is in contact with the bottom of the corresponding first inclined groove (33) or the second inclined groove (43). A first slider (53) is provided on the inclined surface of the triangular block (52). The outer periphery of the first slider (53) is slidably connected in the corresponding first sliding groove (35) or the second sliding groove (46). A guide rod (54) is provided on the lower outer side of the arc-shaped block (51). The other end of the guide rod (54) is slidably connected to the main frame (1) or the hinge (2).

6. The hoisting clamp structure for downhole drilling according to claim 4, characterized in that: The main frame (1) is provided with a first mounting cavity (11), and the first adjusting block (31) is slidably disposed in the first mounting cavity (11). The inner side of the main frame (1) is provided with a first through groove (12), which is connected to the first inclined groove (33). The outer side of the main frame (1) is provided with a second through groove (13). The outer wall of one side of the second through groove (13) is provided with a plurality of second slots (14) along the axial direction. The periphery of the first fixing part (34) is located in the second through groove (13). The execution end of the first fixing part (34) can be engaged in the corresponding second slot (14). The two sides of the opening end of the main frame (1) are respectively provided with a first clearance groove (15) for avoiding the first protrusion (42). The upper end of the main frame (1) is provided with two lifting lugs (16) facing each other.

7. The hoisting clamp structure for downhole drilling according to claim 6, characterized in that: The hinge (2) has a second mounting cavity (21) inside, and the second adjusting block (41) is slidably disposed in the second mounting cavity (21). The inner side of the hinge (2) has a third through groove (22) connected to the second inclined groove (43). A plurality of insertion holes (23) are evenly arranged along the axial direction on one side of the outer wall of the third through groove (22). Each insertion hole (23) corresponds to a second slot (14). One end of the positioning rod (45) can be inserted into the corresponding insertion hole (23). The outer side of the second mounting cavity (21) has a fourth through groove (24), and the other end of the positioning rod (45) is located in the fourth through groove (24).

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