Tool face stabilizing device and directional drilling tool

Abstract

The utility model discloses a tool face stabilizing device and a directional drilling tool, and relates to the technical field of geological core drilling. Comprising an outer pipe, an elastic sleeve and a middle pipe which are sequentially sleeved from outside to inside, the two ends of the elastic sleeve are fixedly connected with the inner side wall of the outer pipe in the respective circumferential directions, the middle pipe can rotate around a first axis in the elastic sleeve, one end of the middle pipe extends out of the outer pipe and is used for being connected with the output end of a power device, and the other end of the middle pipe is fixedly connected with a drill bit. The drill bit extends out of the outer pipe, the first axis is parallel to the axial direction of the outer pipe, a through hole is formed in the side wall of the middle pipe, a positioning hole is formed in the outer pipe, an elastic piece is fixedly arranged on the inner wall of the outer pipe and can cover the positioning hole, and a positioning block is fixedly connected to the position, corresponding to the positioning hole, of the elastic piece. The positioning block can be kept at the first position under the elastic action of the elastic piece. The tool face stabilizing device can effectively stabilize the tool face of the drilling tool.

Description

Technical Field

[0001] This utility model relates to the field of geological core drilling technology, and in particular to a tool face stabilization device and a directional drilling tool. Background Technology

[0002] Exploration of concealed mineral deposits and steeply dipping mineral deposits places high demands on borehole trajectory accuracy, which traditional wireline coring techniques often struggle to meet. This necessitates directional adjustment of the borehole trajectory, known as directional drilling. Traditional directional drilling uses bottom-hole power tools such as screw drills and turbine drills to drive the drill bit, while the upper drill pipe remains stationary. Lateral force is provided by a bent housing or joint, thereby altering the borehole trajectory and achieving directional drilling. However, this method primarily involves full-range drilling, making it difficult to obtain core samples, which contradicts the goal of core extraction in geological and mineral drilling. Furthermore, traditional geological core drilling equipment is often equipped with weak mud pumps and hydraulic manifolds, making it difficult to drive bottom-hole power tools like screw drills and turbine drills, significantly hindering directional drilling for geological cores. Some researchers have explored a technique based entirely on existing wireline coring technology, using a surface drilling rig to drive the directional drilling from below the hole. However, maintaining tool face stability during directional drilling remains a major challenge. Utility Model Content

[0003] The purpose of this invention is to provide a tool face stabilization device and a directional drilling tool to solve the problems existing in the prior art and to effectively stabilize the tool face of the drill bit.

[0004] To achieve the above objectives, this utility model provides the following solution:

[0005] This utility model provides a tool face stabilizing device, comprising an outer tube, an elastic sleeve, and a middle tube arranged sequentially from the outside to the inside. Both ends of the elastic sleeve are fixedly connected to the inner sidewall of the outer tube in their respective circumferential directions. The middle tube is rotatable within the elastic sleeve around a first axis. One end of the middle tube extends out of the outer tube and is used to connect to the output end of a power device. A drill bit is fixedly connected to the other end of the middle tube, extending out of the outer tube. The first axis is parallel to the axial direction of the outer tube. A through hole is provided on the sidewall of the middle tube, and a positioning hole is provided on the outer tube. The elastic sheet is fixedly disposed on the inner wall of the outer tube, and the elastic sheet can cover the positioning hole. The elastic sheet has… The elastic sleeve is elastic and deformable. A positioning block is fixedly connected to the elastic sheet at the position corresponding to the positioning hole. The positioning block is held in a first position by the elastic force of the elastic sheet, and the deformation of the elastic sheet can move the positioning block from the first position to a second position. The positioning block in the first position is located inside the outer wall of the outer tube, and the positioning block in the second position protrudes from the outer wall of the outer tube and can contact the borehole wall. The elastic sleeve can expand and deform under the pressure of the mud introduced into the intermediate tube and act on the elastic sheet, so that the elastic sheet can deform to move the positioning block from the first position to the second position.

[0006] In some embodiments, multiple positioning holes are provided, and the multiple positioning holes are arranged sequentially along the axial direction of the outer tube to form a hole group. Multiple hole groups are arranged at equal intervals in the circumferential direction of the outer tube. The number of elastic plates is the same as the number of hole groups and corresponds one-to-one with each hole group. Each positioning hole in each hole group is provided with a positioning block, and each positioning block in each hole group is fixedly connected to an elastic plate.

[0007] In some embodiments, the intermediate tube includes a pressure tube and a connecting sleeve. One end of the pressure tube extends out of the outer tube and is used to connect to the drill rod. The other end is detachably connected to one end of the connecting sleeve. The other end of the connecting sleeve is detachably connected to the drill bit. The connecting sleeve is rotatably connected inside the outer tube about the first axis. The through hole is provided on the pressure tube, and the elastic sleeve is sleeved on the outside of the pressure tube.

[0008] In some embodiments, the intermediate tube further includes a pressure regulator detachably disposed within the connecting sleeve, the pressure regulator having a flow-through hole extending parallel to the first axis.

[0009] In some embodiments, the end of the connecting sleeve away from the pressure tube is fitted over the drill bit, the connecting sleeve has an annular limiting surface facing the drill bit, the pressure regulator is disposed between the limiting surface and the end face of the drill bit, and the two ends of the pressure regulator are in contact with the limiting surface and the end face of the drill bit, respectively.

[0010] In some embodiments, the outer tube further includes two sleeve joints, one end of each of the two sleeve joints being coaxially fixedly connected to both ends of the elastic sleeve, the outer sidewalls of the two sleeve joints being fixedly connected to the inner sidewall of the outer tube, and both ends of the elastic sheet being fixedly connected to the sleeve joints.

[0011] In some embodiments, the outer tube includes a support tube, a double male connector, a bend connector, a bearing tube, and a lower connector that are threaded together from end to end, and the positioning hole is provided on the support tube.

[0012] In some embodiments, a lower bearing is also included, wherein the position of the bearing tube corresponds to the position of the connecting sleeve, the outer ring of the lower bearing is fixedly connected to the inner side wall of the bearing tube, and the inner ring of the lower bearing is fixedly connected to the outer side wall of the connecting sleeve.

[0013] In some embodiments, an inner tube is also included, the inner tube having a snap-fit ​​structure, and the pressure regulator having a mounting hole coaxially arranged with the intermediate tube. Each of the flow holes is arranged sequentially along the circumference of the mounting hole. The inner tube can extend into the intermediate tube from the end of the intermediate tube away from the drill bit and pass through the mounting hole. The inner tube can also be removed from the end of the intermediate tube away from the drill bit.

[0014] This utility model also provides a directional drilling tool, including: a power unit and the above-mentioned tool face stabilization device, wherein the power output end of the power unit is connected to the end of the intermediate tube away from the drill bit.

[0015] The present invention achieves the following technical advantages over the prior art:

[0016] The tool face stabilization device and directional drilling tool provided by this utility model, during directional drilling, the drill rod drives the intermediate tube to rotate and drives the drill bit to rotate. At this time, the mud pump adopts normal discharge, the flow rate of mud in the intermediate tube increases, the pressure in the pressure zone increases, the elastic sleeve expands and pushes the elastic plate away from the intermediate tube, and the elastic plate drives the positioning block to extend out of the positioning hole. The positioning block contacts the hole wall. At this time, the state of the entire tool face stabilization device is: the outer tube is fixed in the radial direction of the borehole, the intermediate tube rotates relative to the outer tube and the drill bit drills in. Thus, the tool face is stabilized, avoiding the impact of tool face instability on the drilling work. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional view of the tool face stabilizing device in some embodiments of the present invention during directional drilling;

[0019] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0020] Figure 3 A cross-sectional view of the tool face stabilizing device provided by this utility model during drilling;

[0021] Figure 4 Figure 3 A magnified view of a section at point B in the middle;

[0022] Figure 5 for Figure 3 Cross-sectional view of the inner and outer tubes, elastic sleeve, and elastic sheet;

[0023] Figure 6 for Figure 3 Cross-sectional view of the central tube;

[0024] Figure 7 for Figure 3 Cross-sectional view of the central support tube, elastic sleeve, and elastic sheet;

[0025] Figure 8 for Figure 3 Cross-sectional view of the medium pressure regulator;

[0026] In the diagram: 1. Outer tube; 11. Positioning hole; 12. Support tube; 13. Double male connector; 14. Elbow connector; 15. Bearing tube; 16. Lower connector; 2. Elastic sheet; 3. Elastic sleeve; 31. Sleeve connector; 4. Intermediate tube; 41. Pressure tube; 411. Through hole; 42. Connecting sleeve; 421. Limiting surface; 43. Pressure regulator; 431. Flow hole; 432. Mounting hole; 5. Drill bit; 6. Positioning block; 7. Lower bearing; 8. Inner tube. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] The purpose of this utility model is to provide a tool face stabilization device and a directional drilling tool to solve the problems existing in the prior art and to effectively stabilize the tool face of the drill bit.

[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] This utility model provides a tool surface stabilizing device, such as Figure 1-8 As shown, the device includes an outer tube 1, an elastic sleeve 3, and an intermediate tube 4, which are sequentially arranged from the outside to the inside. Both ends of the elastic sleeve 3 are fixedly connected to the inner sidewall of the outer tube 1 in their respective circumferential directions. The intermediate tube 4 can rotate around a first axis within the elastic sleeve 3. One end of the intermediate tube 4 extends out of the outer tube 1 and is used to connect to the output end of a power device. The other end of the intermediate tube 4 is fixedly connected to a drill bit 5, which extends out of the outer tube 1. The first axis is parallel to the axial direction of the outer tube 1. A through hole 411 is provided on the sidewall of the intermediate tube 4. A positioning hole 11 is provided on the outer tube 1. An elastic sheet 2 is fixedly provided on the inner wall of the outer tube 1, and the elastic sheet 2 can cover the positioning hole 11. The elastic sheet 2 has… The elastic sleeve 3 is elastic and deformable. A positioning block 6 is fixedly connected to the elastic plate 2 at the position corresponding to the positioning hole 11. The positioning block 6 can be held in the first position by the elastic force of the elastic plate 2. The deformation of the elastic plate 2 can move the positioning block 6 from the first position to the second position. The positioning block 6 in the first position is located inside the outer wall of the outer tube. The positioning block 6 in the second position protrudes from the outer wall of the outer tube and can contact the borehole wall. The elastic sleeve 3 can expand and deform under the pressure of the mud introduced into the intermediate tube 4 and act on the elastic plate 2 so that the elastic plate 2 can deform and move the positioning block 6 from the first position to the second position.

[0032] The tool face stabilizing device provided by this utility model allows for the following: During non-directional drilling processes such as down-drilling, the mud pump needs to operate at a small or no displacement. In this case, the mud flow rate in the intermediate tube 4 is small, and the pressure in the pressure zone is low. The elastic tube will not cause the elastic plate 2 to pop out in the direction of the outer tube 1. The elastic plate 2 can rebound and cause the positioning block 6 to retract into the positioning hole 11 away from the borehole wall, thus allowing the drill bit 5 to be lowered normally. During directional drilling, the power device drives the intermediate tube 4 to rotate and drives the drill bit 5 to rotate to achieve drilling. At this time, the mud pump operates at a normal displacement, the mud flow rate in the intermediate tube 4 increases, the pressure in the pressure zone increases, the elastic sleeve 3 expands and pushes the elastic plate 2 away from the intermediate tube 4, and causes the elastic plate 2 to drive the positioning block 6 to extend out of the positioning hole 11. The positioning block 6 contacts the borehole wall. At this time, the state of the entire tool face stabilizing device is: the outer tube 1 is fixed in the radial direction of the borehole, the intermediate tube 4 rotates relative to the outer tube 1 and the drill bit 5 drills in. Thus, the tool face is stabilized, avoiding the impact of tool face instability on the drilling work. Among them, the elastic sheet 2 can be made of metal, and the elastic sleeve 3 is preferably made of rubber.

[0033] In this first embodiment, multiple positioning holes 11 are provided. These multiple positioning holes 11 are arranged sequentially along the axial direction of the outer tube 1 to form a hole group. Multiple hole groups are arranged at equal intervals along the circumference of the outer tube 1. The number of elastic plates 2 is the same as the number of hole groups and corresponds one-to-one with each hole group. Each positioning hole 11 in each hole group is provided with a positioning block 6, and each positioning block 6 in each hole group is fixedly connected to an elastic plate 2. The multiple hole groups arranged at equal intervals along the circumference of the outer tube 1 allow the drill bit to be kept in the center position of the borehole during directional drilling.

[0034] In this first embodiment, the intermediate tube 4 includes a pressure tube 41 and a connecting sleeve 42. One end of the pressure tube 41 extends out of the outer tube 1 and is used to connect to the drill rod, while the other end is detachably connected to one end of the connecting sleeve 42. The other end of the connecting sleeve 42 is detachably connected to the drill bit 5. The connecting sleeve 42 is rotatably connected to the outer tube 1 around a first axis. A through hole 411 is provided on the pressure tube 41, and an elastic sleeve 3 is fitted over the pressure tube 41. By setting the connection between the pressure tube 41, the connecting sleeve 42, and the drill bit 5 to a threaded connection, the assembly and disassembly of the intermediate tube 4 are made more convenient.

[0035] In this embodiment, the intermediate pipe 4 further includes a pressure regulator 43, which is detachably disposed within the connecting sleeve 42. The pressure regulator 43 is provided with a flow hole 431, the extension direction of which is parallel to the first axis. When the size and number of flow holes 431 are fixed, the greater the power of the mud pump, the greater the pressure in the pressure pipe 41, and the smaller the power of the mud pump, the smaller the pressure in the pressure pipe 41. To adapt to the operating habits of different operators or the rated power of different mud pumps, different pressure regulators 43 can be replaced as needed. The size of the flow hole 431 on different pressure regulators 43 is different. If the pressure of the mud pump is high, a pressure regulator 43 with a larger flow hole 431 can be replaced; if the pressure of the mud pump is low, a pressure regulator 43 with a smaller flow hole 431 can be replaced.

[0036] In this embodiment, the end of the connecting sleeve 42 furthest from the pressure tube 41 is fitted over the drill bit 5. The connecting sleeve 42 has an annular limiting surface 421 facing the drill bit 5. The pressure regulator 43 is positioned between the limiting surface 421 and the end face of the drill bit 5, with both ends of the pressure regulator 43 contacting the limiting surface 421 and the end face of the drill bit 5, respectively. The limiting surface 421 and the end face of the drill bit 5 effectively restrict the position of the pressure regulator 43, enhancing the stability of the pressure regulator 43 after installation.

[0037] In this embodiment, the outer tube 1 further includes two sleeve joints 31. One end of each sleeve joint 31 is coaxially fixedly connected to both ends of the elastic sleeve 3. The outer sidewalls of the two sleeve joints 31 are fixedly connected to the inner sidewall of the outer tube 1. Both ends of the elastic sheet 2 are fixedly connected to the sleeve joints 31. The sleeve joints 31 can firmly fix the elastic sleeve 3 inside the outer tube 1. The sleeve joints 31 can also block the water flow and serve as components of the pressure zone and the elastic zone, respectively.

[0038] To facilitate the disassembly of the outer tube 1, in this first embodiment, the outer tube 1 includes a support tube 12, a double male connector 13, an elbow connector 14, a bearing tube 15, and a lower connector 16 that are connected in sequence by threads from end to end, and a positioning hole 11 is provided on the support tube 12.

[0039] In this embodiment, a lower bearing 7 is also included. The position of the bearing tube 15 corresponds to the position of the connecting sleeve 42. The outer ring of the lower bearing 7 is fixedly connected to the inner side wall of the bearing tube 15, and the inner ring of the lower bearing 7 is fixedly connected to the outer side wall of the connecting sleeve 42. By setting the lower bearing 7, a stable rotational connection is formed between the intermediate tube 4 and the outer tube 1, and the intermediate tube 4 is axially fixed relative to the outer tube 1.

[0040] In this embodiment, an inner tube 8 is also included. The inner tube 8 has a snap-fit ​​structure. The pressure regulator 43 also has a mounting hole 432, which is coaxially arranged with the intermediate tube 4. Various flow holes 431 are sequentially arranged circumferentially along the mounting hole 432, and preferably communicate with the mounting hole 432. The inner tube 8 can extend into the intermediate tube 4 from the end away from the drill bit 5 and pass through the mounting hole 432. The inner tube 8 can also be removed from the end of the intermediate tube 4 away from the drill bit 5. After the outer tube 1, intermediate tube 4, and drill bit 5 have drilled to the designated position, the core will pass through the drill bit 5 and enter the intermediate tube 4. At this point, the inner tube 8 can be lowered using a suspension device, and the core can be snapped in place using the snap-fit ​​structure inside the inner tube 8. The bottom of the core can be broken off by the drill bit 5, and then the inner tube 8 can be lifted using the suspension device to remove the core.

[0041] Example 2

[0042] This embodiment provides a directional drilling tool, including: a power unit and a tool face stabilizing device as described in Embodiment 1, wherein the power output end of the power unit is connected to the end of the intermediate tube 4 away from the drill bit.

[0043] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A tool face stabilizing device, characterized in that: The device comprises an outer tube, an elastic sleeve, and a middle tube, arranged sequentially from the outside in. Both ends of the elastic sleeve are fixedly connected to the inner sidewall of the outer tube in their respective circumferential directions. The middle tube is rotatable within the elastic sleeve around a first axis. One end of the middle tube extends out of the outer tube and is used to connect to the output end of a power device. A drill bit is fixedly connected to the other end of the middle tube, extending out of the outer tube. The first axis is parallel to the axial direction of the outer tube. A through hole is provided on the sidewall of the middle tube, and a positioning hole is provided on the outer tube. An elastic sheet is fixedly installed on the inner wall of the outer tube, covering the positioning hole. The elastic sheet is elastic and deformable. The sleeve is deformable, and a positioning block is fixedly connected to the elastic sheet at the position corresponding to the positioning hole. The positioning block is held in a first position by the elastic force of the elastic sheet, and the deformation of the elastic sheet can move the positioning block from the first position to a second position. The positioning block in the first position is located inside the outer wall of the outer tube, and the positioning block in the second position protrudes from the outer wall of the outer tube and can contact the borehole wall. The elastic sleeve can expand and deform under the pressure of the mud introduced into the intermediate tube and act on the elastic sheet, so that the elastic sheet can deform to move the positioning block from the first position to the second position.

2. The tool face stabilizing device according to claim 1, characterized in that: The positioning holes are provided in multiple ways, and the multiple positioning holes are arranged sequentially along the axial direction of the outer tube to form a hole group. The hole group is provided in multiple ways at equal intervals in the circumferential direction of the outer tube. The number of elastic plates is the same as the number of hole groups and corresponds one-to-one with each hole group. Each positioning hole in each hole group is provided with a positioning block, and each positioning block in each hole group is fixedly connected to an elastic plate.

3. The tool face stabilizing device according to claim 1, characterized in that: The intermediate tube includes a pressure tube and a connecting sleeve. One end of the pressure tube extends out of the outer tube and is used to connect to the drill rod. The other end is detachably connected to one end of the connecting sleeve. The other end of the connecting sleeve is detachably connected to the drill bit. The connecting sleeve is rotatably connected inside the outer tube around the first axis. The through hole is provided on the pressure tube. The elastic sleeve is sleeved on the outside of the pressure tube.

4. The tool face stabilizing device according to claim 3, characterized in that: The intermediate tube also includes a pressure regulator, which is detachably disposed within the connecting sleeve. The pressure regulator is provided with a flow-through hole, the extension direction of which is parallel to the first axis.

5. The tool face stabilizing device according to claim 4, characterized in that: The end of the connecting sleeve away from the pressure tube is fitted over the drill bit. The connecting sleeve has an annular limiting surface inside, which faces the drill bit. The pressure regulator is disposed between the limiting surface and the end face of the drill bit, and the two ends of the pressure regulator are in contact with the limiting surface and the end face of the drill bit, respectively.

6. The tool face stabilizing device according to claim 1, characterized in that: The outer tube also includes two sleeve joints, one end of each of the two sleeve joints is coaxially fixedly connected to both ends of the elastic sleeve, the outer sidewalls of the two sleeve joints in the circumferential direction are fixedly connected to the inner sidewall of the outer tube, and both ends of the elastic sheet are fixedly connected to the sleeve joints.

7. The tool face stabilizing device according to claim 6, characterized in that: The outer tube includes a support tube, a double male connector, a bend connector, a bearing tube, and a lower connector that are connected by threads from end to end, and the positioning hole is provided on the support tube.

8. The tool face stabilizing device according to claim 7, characterized in that: It also includes a lower bearing, the bearing tube being positioned corresponding to the connecting sleeve, the outer ring of the lower bearing being fixedly connected to the inner wall of the bearing tube, and the inner ring of the lower bearing being fixedly connected to the outer wall of the connecting sleeve.

9. The tool face stabilizing device according to claim 4, characterized in that: It also includes an inner tube with a snap-fit ​​structure inside. The pressure regulator is also provided with a mounting hole, which is coaxially arranged with the intermediate tube. Each of the flow holes is arranged sequentially along the circumference of the mounting hole. The inner tube can extend into the intermediate tube from the end of the intermediate tube away from the drill bit and pass through the mounting hole. The inner tube can also be removed from the end of the intermediate tube away from the drill bit.

10. A directional drilling tool, characterized in that: include: The power unit and the tool face stabilizing device according to any one of claims 1-9, wherein the power output end of the power unit is connected to the end of the intermediate tube away from the drill bit.

Images