A coring drill assembly

Abstract

The application discloses a coring drilling tool matched reaming device and relates to the technical field of coring drilling tools, which comprises a reaming steel body, a liquid separation cylinder and a telescopic reaming wing. The reaming steel body and the liquid separation cylinder are both hollow parts, the liquid separation cylinder is sealingly connected in the inner cavity of the reaming steel body, and the telescopic reaming wing is sealingly arranged between the reaming steel body and the liquid separation cylinder. The telescopic reaming wing can change the outer diameter size according to the change of external pressure. The coring drilling tool matched reaming device can realize self-adaptive contraction and reaming of the outer diameter size of the reaming device when the coring drilling tool matched reaming device is stuck during the coring drilling tool is lowered, so that the coring drilling tool can smoothly reach the hole bottom to carry out coring operation, unnecessary reaming workload during the lowering is reduced, unnecessary abrasion of the reaming device is reduced, and the reaming device can more effectively assist in drilling bit trimming of the hole bottom hole wall quality.

Description

Technical Field

[0001] This invention relates to the technical field of coring tools, and in particular to a reaming device for coring tools. Background Technology

[0002] Obtaining core samples from target strata is an effective way to provide the most direct physical geological data for verifying regional stratigraphic sequences, conducting geological structural studies, and resource assessments in scientific drilling, geothermal exploration, and oil and gas resource surveys. Cores are obtained by drilling into the target strata of the borehole using specialized coring tools. These coring tools must be equipped with reaming devices to resurface and enlarge the borehole walls, which are irregularly formed during drilling, ensuring that the borehole size reaches the target dimensions and that the borehole walls are regular. Currently, different types of drilling projects require different coring methods; some boreholes require continuous coring throughout the entire borehole, while others require coring operations in specific sections. Therefore, during core drilling operations, the borehole wall irregularities (such as spiral walls, local protrusions, pits, or steps) and inconsistent borehole diameters are often caused by a combination of factors, including the type and structural characteristics of the drill bit used in the initial drilling and the release of formation pressure within the borehole. This can lead to the core drilling tool getting stuck during the drilling process. The reaming devices used in existing core drilling tools are often the most prone to getting stuck because the reaming blades are fixed and form local protrusions. Ultimately, this results in obstruction during core drilling, prolonged reaming operations to adjust the borehole wall and diameter, and can easily prevent the core drilling tool from reaching the bottom of the hole for core extraction. Summary of the Invention

[0003] The purpose of this invention is to provide a reaming device for a coring drill bit to solve the problems existing in the prior art. When the reaming device for a coring drill bit gets stuck, it can adaptively shrink the outer diameter of the reaming device to ensure that the coring drill bit can smoothly reach the bottom of the hole to carry out coring operations.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] This invention provides a reaming device for a coring drill bit, comprising a reaming steel body, a liquid-separating cylinder, and a retractable reaming wing. Both the reaming steel body and the liquid-separating cylinder are hollow components. The liquid-separating cylinder is sealed and connected to the inner cavity of the reaming steel body. The retractable reaming wing is sealed between the reaming steel body and the liquid-separating cylinder. The retractable reaming wing can change its outer diameter according to the external pressure.

[0006] Preferably, the expanded steel body is a thick-walled tube, the outer wall of the expanded steel body is provided with a stepped axial surface and the inner cavity is a stepped hole, the large end internal thread of the expanded steel body is used to connect to the upper thread-type conversion joint of the core drilling tool, and the small end external thread is used to connect to the single-action mechanism of the core drilling tool.

[0007] Preferably, a hole retaining ring groove is provided on the inner hole of the large end of the expanded steel body. The hole retaining ring groove is used to accommodate the hole retaining ring, and the hole retaining ring is located between the upper snap-fit ​​adapter and the liquid separator.

[0008] Preferably, the sidewall of the expanded steel body has several rectangular holes in the middle, and the small end shaft wall of the expanded steel body has several inclined insertion holes. The rectangular holes and the insertion holes correspond one-to-one along the axial direction and are connected. Each rectangular hole is movably connected to a retractable expanded wing. One end of the retractable expanded wing is slidably inserted into the insertion hole, and the other end is slidably disposed in the rectangular hole.

[0009] Preferably, the cross-section of the insertion hole is a trapezoid with a larger top and a smaller bottom, and the insertion hole is inclined upward from the inside to the outside along the axial direction.

[0010] Preferably, the retractable expanding wing includes an L-shaped integrally formed expanding wing and a plug-in post. The plug-in post is connected to the lower end of one side of the expanding wing and is inclined upward from the inside to the outside. The plug-in post can be slidably inserted into the plug-in hole. The upper surface of the expanding wing is at least flush with the outer diameter of the large end of the expanding steel body. The total length of the plug-in post and the expanding wing is not greater than the length of the rectangular hole and not greater than the distance from the inner end face of the minimum diameter stepped shaft of the liquid separator to the inner end face of the stepped hole of the rectangular hole.

[0011] Preferably, an axial spring in a compressed state is provided between the other side of the expanding wing and the inner end face of the second small diameter stepped shaft of the liquid separator. A side groove is provided on the other side of the expanding wing, and a slider is provided in the side groove. A blind hole is provided at the top of the slider, and a radial spring is provided in the blind hole. The radial spring is compressed between the slider and the side groove.

[0012] Preferably, a top groove is provided on the top surface of the other side of the expanding wing, and a wear-resistant diameter-maintaining block is welded into the top groove. When the plug is fully inserted into the plug hole, the wear-resistant diameter-maintaining block is higher than the outer diameter of the large end of the expanding steel body.

[0013] Preferably, the liquid separator is a T-shaped multi-step circular tube, the large end of the liquid separator is provided with several stepped shafts, and the large end face of the liquid separator is evenly distributed with 4 square grooves along the circumferential direction. The square grooves are used for assembling tool slots.

[0014] Preferably, the large end of the liquid separator is connected to the inner wall of the expanded steel body by a fine thread, and the small end is inserted into the middle hole of the expanded steel body. Both ends of the liquid separator are provided with sealing rings between them and the inner wall of the expanded steel body.

[0015] The present invention achieves the following technical effects compared to the prior art:

[0016] The core drilling tool matching reaming device of the present invention can realize that when the core drilling tool matching reaming device gets stuck during the process of lowering the core drilling tool, the outer diameter of the reaming device can be adaptively contracted to ensure that the core drilling tool can smoothly reach the bottom of the hole to carry out core sampling operations. At the same time, it reduces the unnecessary reaming workload during the process of lowering the drill, reduces the unnecessary wear of the reaming device, and thus more effectively assists the drill bit in trimming the quality of the hole bottom and hole wall. Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of the reaming use state of the core drilling tool matching reaming device of the present invention;

[0019] Figure 2 It is a schematic structural diagram of the stuck contraction state of the core drilling tool matching reaming device of the present invention;

[0020] Figure 3 It is a schematic internal structure diagram of the reaming steel body in the core drilling tool matching reaming device of the present invention;

[0021] Figure 4 It is an axonometric structural diagram of the reaming steel body in the core drilling tool matching reaming device of the present invention;

[0022] Figure 5 It is an axonometric structural diagram of the telescopic reaming wing in the core drilling tool matching reaming device of the present invention;

[0023] Where: 1 - reaming steel body, 2 - hole retaining ring, 3 - sealing ring, 4 - liquid separation cylinder, 5 - axial spring, 6 - slider, 7 - radial spring, 8 - reaming wing, 9 - wear-resistant gauge protection block, 10 - insertion column, 11 - rectangular hole, 12 - insertion hole, 13 - side groove, 14 - top groove. Detailed Embodiment

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0025] The object of the present invention is to provide a core drill bit matching reaming device to solve the problems existing in the prior art, so that when the core drill bit matching reaming device gets stuck, it can adaptively contract the outer diameter of the reaming device to ensure that the core drill bit can smoothly reach the bottom of the hole to carry out core sampling operations.

[0026] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] As Figures 1 to 5 shown: This embodiment provides a core drill bit matching reaming device, which includes a reaming steel body 1, a liquid isolation cylinder 4 and a telescopic reaming wing. Both the reaming steel body 1 and the liquid isolation cylinder 4 are hollow components. The liquid isolation cylinder 4 is hermetically connected to the inner cavity of the reaming steel body 1. A telescopic reaming wing is hermetically arranged between the reaming steel body 1 and the liquid isolation cylinder 4, and the telescopic reaming wing can change the outer diameter size according to the external pressure.

[0028] Specifically, the reaming steel body 1 is a thick-walled pipe. The outer wall of the reaming steel body 1 has a stepped shaft surface and the inner cavity is a stepped hole. The large-end internal thread of the reaming steel body 1 is used to connect the upper joint type conversion joint of the core drill bit, and the small-end external thread is used to connect the single-acting mechanism of the core drill bit. A hole retaining ring groove is arranged on the large-end inner hole of the reaming steel body 1, and the hole retaining ring groove is used to accommodate the hole retaining ring 2. The hole retaining ring 2 is located between the upper joint type conversion joint and the liquid isolation cylinder 4. The hole retaining ring 2 is a standard part, adjacent to the root of the internal thread of the reaming steel body 1, and is used to prevent the liquid isolation cylinder 4 from loosening and slipping out of the reaming steel body 1.

[0029] A plurality of rectangular holes 11 are opened in the middle of the side wall of the reaming steel body 1. A plurality of inclined insertion holes 12 are arranged on the small-end shaft wall of the reaming steel body 1. The rectangular holes 11 and the insertion holes 12 correspond to each other and are connected along the axis. A telescopic reaming wing is movably connected in each rectangular hole 11. One end of the telescopic reaming wing is slidably inserted into the insertion hole 12, and the other end is slidably arranged in the rectangular hole 11. The cross-section of the insertion hole 12 is a trapezoid with a larger upper part and a smaller lower part, and the insertion hole 12 is inclined upward from the inside to the outside along the axis. In this embodiment, 6 rectangular holes 11 and insertion holes 12 are respectively machined on the reaming steel body 1, and the axis of the insertion hole 12 forms an acute angle with the central axis of the reaming steel body 1 to form an inclined slideway.

[0030] The telescopic reaming wing includes a reaming wing 8 and an insertion column 10 which are integrally arranged in an L shape (or in a "卩" shape). The insertion column 10 is connected to the lower end of one side of the reaming wing 8 and is inclined upward from the inside to the outside. The insertion column 10 can be slidably inserted into the insertion hole 12. The upper surface of the reaming wing 8 can at least be flush with the outer diameter of the large end of the reaming steel body 1. The total length of the insertion column 10 and the reaming wing 8 is not greater than the length of the rectangular hole 11 and not greater than the distance from the inner end face of the minimum-diameter stepped shaft of the liquid isolation cylinder 4 to the stepped hole inner end face of the rectangular hole 11. As Figure 1 and Figure 2 As shown, the inner end face of the smallest diameter stepped shaft of the liquid separator 4 is located on the right side of the end of the rectangular hole 11. The insertion post 10 can slide axially along the slide formed by the inclined insertion hole 12, thereby allowing the expanding wing 8 to slide obliquely along the length direction of the rectangular hole 11 under the guidance of the insertion post 10, thus changing the outer diameter height of the expanding wing 8 and realizing the contraction and expansion of the expanding wing 8.

[0031] An axial spring 5 in a compressed state is provided between the other side of the expanding wing 8 and the inner end face of the second small-diameter stepped shaft of the liquid separator 4. A side groove 13 is provided on the other side of the expanding wing 8, and a slider 6 is provided in the side groove 13. A blind hole is provided on the top of the slider 6, and a radial spring 7 is provided in the blind hole. The radial spring 7 is compressed between the slider 6 and the side groove 13. In this embodiment, the axial spring 5 is a custom-made high-elasticity cylindrical helical spring, which is installed in the cavity formed after the expanding steel body 1 and the liquid separator 4 are connected. One end of the axial spring 5 is fitted on the stepped surface of the larger outer diameter of the liquid separator 4, and the other end is pre-tightened and abuts against the side of the slider 6. The slider 6 is a square block with a circular arc surface at the bottom, and the circular arc surface is in contact with the outer circumference of the small end of the liquid separator 4 and can slide axially. The radial spring 7 is a standard cylindrical spring, which is pre-tightened and installed in the blind hole of the slider 6. A top groove 14 is provided on the top surface of the other side of the reaming wing 8. A wear-resistant diameter-maintaining block 9 is welded into the top groove 14. When the insertion post 10 is fully inserted into the insertion hole 12, the wear-resistant diameter-maintaining block 9 is higher than the outer diameter of the large end of the reaming steel body 1. The wear-resistant diameter-maintaining block 9 is a cuboid block formed by hot pressing of wear-resistant materials, hard alloys, and diamond powder. It is welded into the top groove 14 of the reaming wing 8 and is the workpiece that directly interacts with the hole wall during hole reaming. By embedding the wear-resistant diameter-maintaining block 9 on the independent reaming wing 8, the disadvantage of directly scrapping the reaming steel body 1 due to the damage of the wear-resistant diameter-maintaining block 9 is avoided, and the independent and quick replacement of the reaming wing 8 is realized.

[0032] The fluid separator 4 is a T-shaped multi-step circular tube. The large end of the fluid separator 4 has several stepped shafts, and four square grooves are evenly distributed along the circumference of the large end face. These square grooves are used for tool mounting. The large end of the fluid separator 4 is connected to the inner wall of the reaming steel body 1 via a fine-pitch thread, and the small end is inserted into the central hole of the reaming steel body 1. Sealing rings 3 are installed between both ends of the fluid separator 4 and the inner wall of the reaming steel body 1. In this embodiment, standard O-rings are used for the sealing rings 3, which are installed at both ends of the inner hole of the reaming steel body 1 to enhance the sealing between the fluid separator 4 and the reaming steel body 1. The through-type fluid separator 4 allows for the smooth deployment of the core tube of the core drilling tool, and the double-sealing structure of the upper "thread + O-ring" and the lower two O-rings effectively ensures the isolation of the drilling fluid inside and outside the core drilling tool.

[0033] The reaming device for the core drilling tool of the present invention can prevent the drill from getting stuck. By designing a sliding track through the insertion hole 12 on the reaming steel body 1, and the insertion post 10 being designed as a column with a trapezoidal cross section, the two are matched to form a variable diameter guide structure. The wear-resistant diameter-maintaining block 9 is embedded on the reaming wing 8 and installed inside the reaming steel body 1. It can slide along the sliding track of the insertion hole 12 to shrink and expand, effectively solving the problem that the wear-resistant diameter-maintaining block 9 of the existing core drilling tool reaming device directly acts as the reaming wing 8 and is welded to the reaming steel body 1 to form a fixed boss, which easily causes the drill to get stuck. During the core drilling process, when the borehole wall is irregular or the borehole diameter is reduced, the reaming wing 8 can retract under the pressure of the borehole wall to adapt to the borehole diameter, thus preventing the core drilling tool from getting stuck. After the core drilling tool is lowered to the bottom of the hole, as the drill bit continues to drill, the reaming wing 8 adapts to the maximum outer diameter within the reaming steel body 1 under the push of the axial spring 5 to assist the drill bit in secondary wall repair and borehole enlargement. The slider 6 slides tightly against the outer wall of the liquid separator 4 along with the reaming wing 8, and together with the radial spring 7, supports the radial stability of the reaming wing 8. The through-type fluid separator 4 allows for the smooth deployment of the core tube of the core drilling tool. Furthermore, the double-sealing structure of the upper "thread + O-ring" and the lower two O-rings effectively ensures the isolation of the drilling fluid inside and outside the core drilling tool, ensuring that the core drilling tool can smoothly reach the bottom of the hole to carry out core drilling operations. At the same time, it reduces unnecessary hole reaming work during the drilling process and reduces unnecessary wear on the hole reaming device, thereby more effectively assisting the drill bit in finishing the bottom hole and hole wall quality.

[0034] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A coring assembly reamer, comprising: The application relates to a reaming steel body, a liquid-separating cylinder and a telescopic reaming wing, wherein the reaming steel body and the liquid-separating cylinder are hollow parts, the liquid-separating cylinder is sealingly connected in the inner cavity of the reaming steel body, and the telescopic reaming wing is sealingly arranged between the reaming steel body and the liquid-separating cylinder; the telescopic reaming wing can change the outer diameter size according to the change of external pressure. A plurality of rectangular holes are arranged in the middle part of the side wall of the reaming steel body; a plurality of inclined insertion holes are arranged on the small-end shaft wall of the reaming steel body; the rectangular holes and the insertion holes correspond to each other in the axial direction and are communicated; each telescopic reaming wing is movably connected in each rectangular hole; one end of the telescopic reaming wing is slidingly inserted into the insertion hole, and the other end is slidingly arranged in the rectangular hole. The telescopic reaming wing comprises a reaming wing and an insertion column which are integrally arranged in an L shape; the insertion column is connected to the lower end of one side of the reaming wing and is inclined upward from inside to outside; the insertion column can be slidingly inserted into the insertion hole; the upper surface of the reaming wing can be flush with the outer diameter of the large end of the reaming steel body at least; the total length of the insertion column and the reaming wing is not greater than the length of the rectangular hole and is not greater than the distance from the inner end face of the minimum diameter step shaft of the liquid-separating cylinder to the inner end face of the step hole of the rectangular hole. An axial spring in a compressed state is arranged between the other side of the reaming wing and the second small-diameter step shaft inner end face of the liquid-separating cylinder; the other side of the reaming wing is provided with a side groove; a sliding block is arranged in the side groove; a blind hole is arranged on the top of the sliding block; a radial spring is arranged in the blind hole and compressed between the sliding block and the side groove; a top groove is arranged on the top surface of the other side of the reaming wing; a wear-resistant diameter-protecting block is embedded and welded in the top groove; when the insertion column is completely inserted into the insertion hole, the wear-resistant diameter-protecting block is higher than the outer diameter of the large end of the reaming steel body.

2. The coring drill assembly underreamer of claim 1, wherein: The reaming steel body is a thick-walled pipe; the outer wall of the reaming steel body is provided with a step shaft face and the inner cavity is a step hole; the inner thread of the large end of the reaming steel body is used for connecting the upper buckle type conversion joint of a coring drilling tool, and the outer thread of the small end is used for connecting the single-acting mechanism of the coring drilling tool.

3. The coring drill assembly underreamer of claim 2, wherein: A hole check ring groove is arranged on the inner hole of the large end of the reaming steel body; the hole check ring groove is used for accommodating a hole check ring; the hole check ring is located between the upper buckle type conversion joint and the liquid-separating cylinder.

4. The coring drill assembly underreamer of claim 1, wherein: The cross section of the insertion hole is a trapezoid with the upper part larger than the lower part; and the insertion hole is inclined upward from inside to outside in the axial direction.

5. The coring drill assembly underreamer of claim 1, wherein: The liquid-separating cylinder is a T-shaped multi-step round pipe; the large end of the liquid-separating cylinder is provided with a plurality of step shafts; the large end face of the liquid-separating cylinder is uniformly provided with four square grooves in the circumferential direction; the square grooves are used for assembling tool clamping positions.

6. The coring drill assembly underreamer of claim 1, wherein: The large end of the liquid-separating cylinder is connected with the inner wall of the reaming steel body through fine thread connection, and the small end is inserted into the hole of the reaming steel body; sealing rings are arranged between the two ends of the liquid-separating cylinder and the inner wall of the reaming steel body.

Images