While-drilling sidewall coring tool and drilling apparatus

Abstract

The utility model discloses a kind of while drilling sidewall coring tools and well drilling device, it is related to drilling technology field, while drilling sidewall coring tool includes power coring head, spiral centralizer, elastic tube and remote control device, and power coring head is provided with coring device inside;Spiral centralizer has the central flow passage for the circulation of drilling fluid;Elastic tube one end is connected in spiral centralizer, the other end is connected power coring head, first through-hole is set on the circulating groove of spiral centralizer, drilling fluid can enter power coring head through elastic tube;Power coring head can be moved under the impact of drilling fluid and drive elastic tube elongation, and coring is carried out by first through-hole extending spiral centralizer;Remote control device is set in spiral centralizer, can be connected or closed central flow passage and elastic tube, when needing coring, power coring head extends spiral centralizer and carries out coring, when not needing coring, power coring head is retracted in spiral centralizer, without affecting normal well drilling work, coring cost is low, and period is short.

Description

Technical Field

[0001] This utility model relates to the field of drilling technology, and in particular to a core sampling tool and drilling device for drilling wellbore. Background Technology

[0002] With the development of logging technology, oilfield exploration and reservoir development are becoming increasingly complex. Core analysis has become an important task to determine reservoir permeability and formation pressure gradient. Geological exploration increasingly needs to obtain data on fluid saturation, reservoir pressure, oil layer relative humidity, and reservoir properties in heterogeneous reservoirs under wellbore conditions that are closer to the actual formation conditions. The market urgently needs wellbore coring technology to meet the service needs of oilfields and solve the problems of complex reservoir exploration and development.

[0003] Although wellbore coring devices exist in the prior art, they are all lowered into the well after drilling is completed before coring. For example, Chinese patent application (CN119712093A) discloses a core storage sub and a drilling-type wellbore coring instrument. In use, drilling must be completed first, then the drilling-type wellbore coring instrument is connected to the drill pipe and lowered back into the well. Then, the drilling-type wellbore coring instrument is used to cor the section of the well where coring is required. The coring cost is high and the coring cycle is long. Utility Model Content

[0004] The purpose of this utility model is to provide a core sampling tool and drilling device that allows the power core sampler to extend from the auger stabilizer when core sampling is required during drilling. When core sampling is not required, the power core sampler retracts into the auger stabilizer, without affecting normal drilling operations. This method has low core sampling cost and short core sampling cycle, thus solving the problems existing in the prior art.

[0005] To achieve the above objectives, this utility model provides the following solution: This utility model discloses a coring tool for drilling wellbore, including a powered coring head, a auger centralizer, an elastic tube, and a remote control device. The powered coring head contains a coring device; the auger centralizer has a central channel for drilling fluid flow; one end of the elastic tube is connected to the interior of the auger centralizer and communicates with the central channel, and the other end is connected to the powered coring head. A first through-hole is provided on the circulation groove of the auger centralizer for the powered coring head to pass through, allowing the drilling fluid to enter the powered coring head through the elastic tube; the powered coring head can move under the impact of the drilling fluid, causing the elastic tube to extend, so that the powered coring head extends out of the auger centralizer through the first through-hole to cor the wellbore; the remote control device is located inside the auger centralizer and can connect or close the central channel and the elastic tube.

[0006] In some embodiments, the power coring head includes a fixing part and a drill head. The top of the fixing part is connected to the elastic tube, and a first flow channel communicating with the elastic tube is provided inside the fixing part. A plurality of pressure water holes communicating with the first flow channel are opened on the top of the fixing part. The drill head is rotatably connected to the end of the fixing part away from the elastic tube. A second flow channel is provided inside the drill head, and the second flow channel is communicating with the first flow channel. A plurality of drill water holes communicating with the second flow channel are opened at the bottom of the drill head. The diameter of each drill water hole is the same as the diameter of each pressure water hole, and the number of drill water holes is less than the number of pressure water holes. A second through hole for the core to pass through is provided at the bottom of the drill head, and the core enters the coring device through the second through hole.

[0007] In some embodiments, a turbine structure is provided in the second flow channel. The turbine structure can rotate under the impact of the drilling fluid and drive the drill bit to rotate relative to the fixed part, so as to drill on the well wall.

[0008] In some embodiments, the coring device is connected to the fixing part, and the drill bit is rotatably sleeved on the outer periphery of the coring device.

[0009] In some embodiments, the coring device includes a coring cylinder and a core-clamping mechanism. The top of the coring cylinder is connected to the fixing part, and the axis of the coring cylinder is coaxially arranged with the rotation axis of the drill bit. The core-clamping mechanism is located at the bottom of the coring cylinder and can clamp the core when the power coring head retracts.

[0010] In some embodiments, the core-clamping mechanism includes a claw spring seat and a claw spring. The claw spring seat is connected to the bottom of the inner wall of the drill bit and is coaxially arranged with the core barrel. The inner wall of the claw spring seat near the core barrel has a first conical surface, with the larger end of the first conical surface close to the core barrel. The end of the claw spring axially close to the fixing part is an annular structure, and the inner wall of the annular structure is slidably connected to the outer wall of the end of the core barrel away from the fixing part. The end of the claw spring axially away from the fixing part has multiple core claws. The outer wall of the multiple core claws is a second conical surface with the same taper as the first conical surface. The second conical surface can slide along the first conical surface close to or away from the fixing part. When the claw spring moves away from the fixing part with the core, the second conical surface can clamp with the first conical surface, and the multiple core claws are clamped on the outer wall of the core.

[0011] In some embodiments, the inner wall of each core claw is provided with a unidirectional serrated structure along the axial direction of the core tube to prevent the core from exiting the core-taking device.

[0012] In some embodiments, the drill bit is an impregnated diamond drill bit.

[0013] In some embodiments, the remote control device includes a central flow channel valve, a flexible tube valve, and a control unit. The central flow channel valve is disposed in the central flow channel; the flexible tube valve is disposed at one end of the flexible tube near the central flow channel; the control unit is communicatively connected to the central flow channel valve and the flexible tube valve; the control unit can open the flexible tube valve while closing the central flow channel valve to allow the drilling fluid to flow into the flexible tube; the control unit can also close the flexible tube valve while opening the central flow channel valve to allow the drilling fluid to flow out of the auger through the central flow channel.

[0014] This utility model also discloses a drilling device, including one or more of the above-mentioned coring tools for drilling wellbore, wherein the coring tools for drilling wellbore are connected to the drill string through the upper and lower ends of the auger stabilizer.

[0015] The present invention achieves the following technical advantages over the prior art: This invention provides a coring tool for drilling wellbore walls. It features an elastic tube within a auger centralizer, with a power coring head connected to it. Under the impact of drilling fluid, the power coring head moves, causing the elastic tube to extend, allowing the power coring head to extend beyond the auger centralizer and cor the wellbore. A remote control device can close or open the central flow channel and the elastic tube. By controlling the flow direction of the drilling fluid, the power coring head retracts into the auger along with the elastic tube when there is no drilling fluid impact. During drilling, when coring is needed, the power coring head extends beyond the auger centralizer; when not needed, it retracts. It can be directly connected between the drill string and cored by the drilling team during drilling, eliminating the need to lower the coring instrument into the well after drilling is complete. This results in low coring costs and a short coring cycle.

[0016] This utility model also provides a drilling device, including one or more of the above-mentioned coring tools for drilling wellbore, which can simultaneously cor the wellbore at one or more locations during the drilling process. Compared with the prior art, which requires the coring instrument to be lowered after drilling is completed and coring is performed one by one at the locations of the wellbore that need to be cored, this significantly reduces the coring cost and coring cycle at multiple locations of the wellbore. 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 A schematic diagram of the overall structure of the drilling wall coring tool in Embodiment 1 of this utility model when the power coring head is extended; Figure 2 A schematic diagram of the overall structure of the drilling wall coring tool in Embodiment 1 of this utility model when the power coring head is retracted; Figure 3 A schematic diagram of the overall structure of the power-driven core extractor in Embodiment 1 of this utility model; Figure 4 A partial cross-sectional view of the power corer in Embodiment 1 of this utility model; Figure 5 for Figure 4 A magnified view of part A in the middle; Figure 6 for Figure 4 A magnified view of part B in the middle section.

[0019] In the diagram: 100, Coring tool for drilling wall; 1, Power coring head; 11, Coring device; 111, Coring tube; 112, Claw spring seat; 113, Claw spring; 12, Fixing part; 121, First flow channel; 122, Pressure water inlet; 123, First housing; 124, First connecting part; 125, Bearing; 126, Limiting ring; 127, Flow guide connector; 13, Drill head; 131, Second flow channel; 132, Drill bit water inlet; 133, Second housing; 134, Second connecting part; 135, Turbine structure; 2, Spiral centralizer; 21, First through hole; 3, Elastic tube. Detailed Implementation

[0020] 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.

[0021] The purpose of this utility model is to provide a core sampling tool and drilling device that allows the power core sampler to extend from the auger stabilizer when core sampling is required during drilling. When core sampling is not required, the power core sampler retracts into the auger stabilizer, without affecting normal drilling operations. This method has low core sampling cost and short core sampling cycle, thus solving the problems existing in the prior art.

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the following description is provided in conjunction with the appendix. Figures 1-6 The present invention will be further described in detail below with reference to specific embodiments.

[0023] Example 1 This utility model provides a drilling wall coring tool 100, for reference. Figures 1-2The system includes a power corer 1, a spiral stabilizer 2, an elastic tube 3, and a remote control device (not shown in the figure). The power corer 1 is equipped with a core-taking device 11. The spiral stabilizer 2 has a central flow channel for drilling fluid circulation. One end of the elastic tube 3 is connected to the inside of the spiral stabilizer 2 and communicates with the central flow channel. The other end of the elastic tube 3 is connected to the power corer 1. A first through hole 21 is opened on the circulation groove of the spiral stabilizer 2 for the power corer 1 to pass through. Drilling fluid can enter the power corer 1 through the elastic tube 3. The power corer 1 can move under the impact of the drilling fluid and drive the elastic tube 3 to extend, so that the power corer 1 extends out of the spiral stabilizer 2 through the first through hole 21 to core the well wall. The remote control device is set inside the spiral stabilizer 2 and can connect or close the central flow channel and the elastic tube 3. By installing an elastic tube 3 inside the auger centralizer 2 and connecting the power coring head 1 to the elastic tube 3, the power coring head 1 moves under the impact of drilling fluid, causing the elastic tube 3 to extend. This allows the power coring head 1 to extend out of the auger centralizer 2 and cor the well wall. A remote control device can close or connect the central flow channel and the elastic tube 3. By controlling the flow direction of the drilling fluid, the power coring head 1 retracts into the auger centralizer 2 along with the elastic tube 3 when there is no drilling fluid impact. This allows the power coring head 1 to extend out of the auger centralizer 2 to cor when coring is needed during drilling, and to retract into the auger centralizer 2 when coring is not needed. This coring tool 100 can be directly connected between the drill string. During drilling, the drilling team performs coring while drilling, eliminating the need to lower the coring instrument into the well after drilling is completed. This results in low coring cost and a short coring cycle. In this embodiment, the spiral centralizer 2 is provided with three circulation grooves, each circulation groove having a first through hole 21. Each first through hole 21 corresponds to an elastic tube 3 and a power corer 1. Each elastic tube 3 is connected to the central flow channel, meaning that one spiral centralizer 2 is connected to three power corers 1. In other embodiments, other forms of spiral centralizer 2 can be selected, and the number of power corers 1 can be set according to specific needs. Furthermore, by setting the power corers 1 on the spiral centralizer 2, the stability of the drilling wellbore coring tool 100 can be ensured without the need for additional wellbore support structures, simplifying the overall structure of the drilling wellbore coring tool 100.

[0024] In some implementations, reference Figures 3-4The power core sampling head 1 includes a fixing part 12 and a drill head 13. The top of the fixing part 12 is connected to an elastic tube 3. A first flow channel 121 communicating with the elastic tube 3 is provided inside the fixing part 12. A plurality of pressure water holes 122 communicating with the first flow channel 121 are opened at the top of the fixing part 12. The drill head 13 is rotatably connected to the end of the fixing part 12 away from the elastic tube 3. A second flow channel 131 is provided inside the drill head 13, and the second flow channel 131 is connected with the first flow channel 121. A plurality of drill water holes 132 communicating with the second flow channel 131 are opened at the bottom of the drill head 13. The diameter of each drill water hole 132 is the same as the diameter of each pressure water hole 122, and the number of drill water holes 132 is less than the number of pressure water holes 122. A second through hole for the core to pass through is provided at the bottom of the drill head 13. The core enters the core sampling device 11 through the second through hole. In this embodiment, the elastic tube 3 is connected to the fixing part 12 through a compression pipe joint. The fixing part 12 includes a first housing 123 and a first connecting part 124. The drill bit 13 includes a second housing 133 and a second connecting part 134. The inner wall of the first housing 123 near the end of the drill bit 13 is provided with a first limiting step, and the outer wall of the second housing 133 near the end of the fixing part 12 is provided with a second limiting step. The first limiting step and the second limiting step cooperate to restrict the relative axial movement of the drill bit 13 and the fixing part 12. The first connecting part 124 is sleeved on the outer periphery of the second connecting part 134. The inner wall of the first connecting part 124 is provided with a third limiting step, and the outer periphery of the end of the second connecting part 134 near the fixing part 12 is also sleeved with a bearing 125 and a limiting ring 126. One end of the bearing 125 abuts against the third limiting step, and the other end of the bearing 125 abuts against the limiting ring 126, so as to restrict the relative axial displacement of the fixing part 12 and the drill bit 13 while ensuring that the fixing part 12 and the drill bit 13 can rotate relative to each other. Furthermore, by setting the orifice diameter of the drill bit water eye 132 to be the same as that of the pressure water eye 122, and the number of drill bit water eyes 132 is less than the number of pressure water eyes 122, when the drilling fluid flows into the drill head 13, the reaction force of the drilling fluid ejected from the pressure water eye 122 is greater than the reaction force of the drilling fluid ejected from the drill bit water eye 132. Therefore, it can drive the power core head 1 to move and stretch the elastic tube 3, so that the power core head 1 extends out of the spiral stabilizer 2 and drills into the well wall. The bottom of the drill head 13 is provided with a second through hole. As the power core head 1 drills, some rock is broken and removed by the drill head 13 to form a cylindrical rock core. The rock core gradually enters the core sampling device 11 through the second through hole to achieve well wall core sampling.

[0025] In some implementations, reference Figure 4A turbine structure 135 is installed within the second flow channel 131. The turbine structure 135 rotates under the impact of the drilling fluid, driving the drill bit 13 to rotate relative to the fixed part 12, thus drilling into the wellbore. By installing the turbine structure 135 within the second flow channel 131, the drilling fluid impacts the turbine structure 135 after entering the power core 1 through the elastic tube 3, causing the drill bit 13 to rotate relative to the fixed part 12. This achieves drilling powered by the drilling fluid, resulting in a simple and easy-to-implement structure. In this embodiment, the turbine structure 135 is specifically a turbine rotor connected to the second connecting part 134. Impacted by the drilling fluid, it can reach a rotational speed of 5000-30000 r / min, driving the drill bit 13 to rotate at high speed for rock breaking. The turbine rotor is existing technology and will not be described further here.

[0026] In some implementations, reference Figures 4-5 The coring device 11 is connected to the fixing part 12, and the drill bit 13 is rotatably sleeved on the outer periphery of the coring device 11. Specifically, the fixing part 12 is also provided with a flow guide connector 127. The end of the flow guide connector 127 near the elastic tube 3 is a continuous arc surface to reduce the energy consumption of the drilling fluid. The outer wall of the end of the flow guide connector 127 away from the elastic tube 3 is threadedly connected to the inner wall of the first connecting part 124, and the inner wall is threadedly connected to the coring device 11. The drill bit 13 and the coring device 11 are spaced apart to avoid the rotation of the drill bit 13 affecting the coring device 11 and causing core breakage. After coring is completed, the flow guide connector 127 can be unscrewed to remove the coring device 11 from the power coring head 1 to extract the core. To facilitate the disassembly of the flow guide connector 127, a disassembly and assembly structure that cooperates with the disassembly device can also be provided on the outer wall of the flow guide connector 127.

[0027] In some implementations, reference Figures 4-6 The coring device 11 includes a coring cylinder 111 and a core-clamping mechanism. The top of the coring cylinder 111 is connected to the fixing part 12, and the axis of the coring cylinder 111 is coaxially arranged with the rotation axis of the drill bit 13. The core-clamping mechanism is located at the bottom of the coring cylinder 111 and can clamp the core when the power coring head 1 retracts. Specifically, the top of the coring cylinder 111 is threadedly connected to the inner wall of the flow guide connector 127 to facilitate the removal of the core after coring. The core-clamping mechanism can clamp the root of the core when the power coring head 1 retracts, preventing the core from falling out of the coring cylinder 111 and causing coring failure.

[0028] In some implementations, reference Figure 6The core clamping mechanism includes a claw spring seat 112 and a claw spring 113. The claw spring seat 112 is connected to the bottom of the inner wall of the drill bit 13 and is coaxially arranged with the core barrel 111. The inner wall of the claw spring seat 112 near the core barrel 111 is provided with a first conical surface, and the large end of the first conical surface is located near the core barrel 111. The end of the claw spring 113 axially near the fixing part 12 is an annular structure. The inner wall of the annular structure is slidably connected to the outer wall of the end of the core barrel 111 away from the fixing part 12. The end of the claw spring 113 axially away from the fixing part 121 is provided with multiple core claws. The outer wall of the multiple core claws is a second conical surface with the same taper as the first conical surface. The second conical surface can slide along the first conical surface near or away from the fixing part 12. When the claw spring 113 moves away from the fixing part 12 with the core, the second conical surface can clamp with the first conical surface and clamp the multiple core claws on the outer wall of the core. In this embodiment, the claw spring seat 112 is fixedly connected to the bottom of the inner wall of the second connecting part 134 of the drill bit 13. This fixed connection can be a threaded connection, welding, or other connection methods to prevent the claw spring seat 112 from loosening or falling out during drilling, which could lead to core failure. By setting the claw spring seat 112 and the claw spring 113, and setting a first conical surface on the inner wall of the claw spring seat 112 near the core barrel 111, and setting a second conical surface on the outer wall of multiple core claws with the same taper as the first conical surface, when the power core head 1 retracts, the core moves away from the fixed part 12 along the axis of the core barrel 111 within the core barrel 111, and drives the claw spring 113 to move away from the fixed part 12. At this time, the second conical surface slides along the first conical surface, squeezing each core claw towards the core, clamping the core, and the power core head 1 further retracts, breaking off the root of the core, thus completing the core extraction. In some other embodiments, the core clamping mechanism may also use a snap ring seat and a snap ring. The snap ring seat has a third conical surface on the inner wall of the side near the core barrel 111, and the large end of the third conical surface is located near the core barrel 111. The snap ring is an annular structure with a through groove, which cuts the entire annular structure into a C-shape. The outer wall of the snap ring is a fourth conical surface with the same taper as the third conical surface. The fourth conical surface can slide along the third conical surface towards or away from the fixing part 12. When the snap ring moves away from the fixing part 12 with the core, the fourth conical surface can clamp with the third conical surface, so that the snap ring is clamped on the outer wall of the core. When the power core head 1 retracts, the fourth conical surface slides along the third conical surface to tighten the snap ring and achieve core clamping.

[0029] In some implementations, reference Figure 6 The inner wall of each core claw is equipped with a unidirectional serrated structure along the axial direction of the core sampling tube 111 to prevent the core from exiting the core sampling device 11. By setting the unidirectional serrated structure, the resistance to the core is small when it enters the core sampling tube 111, and core sampling can be achieved smoothly; when it is necessary to cut the core, the unidirectional serrated structure provides greater resistance to the core, making it difficult for the core to come out of the power core sampling head 1. With the retraction of the power core sampling head 1, the core can be cut quickly.

[0030] In some embodiments, the drill bit 13 is a diamond-impregnated drill bit. By impregnating the drill bit 13 with diamond particles, the overall wear rate of the drill bit 13 is matched with the wear rate and shedding rate of the diamond particles, which can ensure the service life and grinding efficiency of the drill bit 13.

[0031] In some embodiments, the remote control device includes a central flow channel valve, a flexible tube valve, and a control unit. The central flow channel valve is disposed in the central flow channel; the flexible tube valve is disposed at one end of the flexible tube 3 near the central flow channel; the control unit is communicatively connected to the central flow channel valve and the flexible tube valve, and the control unit can open the flexible tube valve while closing the central flow channel valve to allow drilling fluid to flow into the flexible tube 3; the control unit can close the flexible tube valve while opening the central flow channel valve to allow drilling fluid to flow out of the spiral stabilizer 2 through the central flow channel. Specifically, both the central flow channel valve and the flexible tube valve can be electromagnetic valves. The control unit is located inside the auger stabilizer 2 and is connected to the wellhead control system. It can remotely control the opening and closing of the central flow channel valve and the flexible tube valve to switch the drilling fluid flow direction. Coring can be achieved by switching the drilling fluid flow channel. When coring is needed, the central flow channel valve is closed and the flexible tube valve is opened. The power coring head 1 can extend out of the auger stabilizer 2 to perform coring under the impact of the drilling fluid. When coring is not needed, the power coring head 1 retracts into the auger stabilizer 2. This co-rotating tool 100 can be directly connected between the drill string. During drilling, the drilling team performs coring while drilling, without having to lower the coring instrument into the well after drilling is completed. This results in low coring cost and short coring cycle.

[0032] Example 2 This utility model also discloses a drilling device, including one or more coring tools 100 as described in Embodiment 1. The coring tools 100 are connected to the drill string through the upper and lower ends of the auger stabilizer 2, and can simultaneously cor the well wall at one or more locations during the drilling process. Compared with the prior art, which requires the coring instrument to be lowered after drilling and coring the well wall locations one by one, this significantly reduces the coring cost and coring cycle for multiple locations on the well wall.

[0033] 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 while-drilling sidewall coring tool characterized by: include: A powered core extractor, wherein a core extractor is provided inside the powered core extractor; A spiral stabilizer, wherein the spiral stabilizer has a central flow channel for drilling fluid to flow through; An elastic tube is provided, one end of which is connected to the inside of the spiral centralizer and communicates with the central flow channel. The other end of the elastic tube is connected to the power corer. A first through hole is provided on the circulation groove of the spiral centralizer for the power corer to pass through. The drilling fluid can enter the power corer through the elastic tube. The power corer can move under the impact of the drilling fluid and drive the elastic tube to extend, so that the power corer can extend out of the spiral centralizer through the first through hole to cor the well wall. as well as A remote control device is provided inside the spiral straightener, and the remote control device is capable of connecting or closing the central flow channel and the elastic tube.

2. The drill collar coring tool of claim 1, wherein: The powered core extractor includes: A fixing part, the top of which is connected to the elastic tube, is provided with a first flow channel communicating with the elastic tube inside the fixing part, and a plurality of pressurized water holes communicating with the first flow channel are opened on the top of the fixing part; and The drill head is rotatably connected to the end of the fixed part away from the elastic tube. A second flow channel is provided inside the drill head, which is connected to the first flow channel. A plurality of drill water holes are provided at the bottom of the drill head, which are connected to the second flow channel. The diameter of each drill water hole is the same as the diameter of each pressure water hole, and the number of drill water holes is less than the number of pressure water holes. A second through hole is provided at the bottom of the drill head for the core to pass through, and the core enters the core sampling device through the second through hole.

3. The drill collar coring tool of claim 2, wherein: The second flow channel is equipped with a turbine structure, which can rotate under the impact of the drilling fluid and drive the drill bit to rotate relative to the fixed part, so as to drill on the well wall.

4. The drill collar coring tool of claim 3, wherein: The core-taking device is connected to the fixed part, and the drill bit is rotatably sleeved on the outer periphery of the core-taking device.

5. The drill collar coring tool of claim 4, wherein: The core extraction device includes: A core sampler, the top of which is connected to the fixing part, and the axis of the core sampler is coaxially arranged with the rotation axis of the drill bit. A core-clamping mechanism is located at the bottom of the core-taking cylinder. The core-clamping mechanism can clamp and break the rock core when the power core-taking head retracts.

6. The coring tool for drilling wellbore as described in claim 5, characterized in that: The card core mechanism includes: A claw spring seat is connected to the bottom of the inner wall of the drill bit and is coaxially arranged with the core sampler. A first conical surface is provided on the inner wall of the claw spring seat near the core sampler, with the larger end of the first conical surface positioned close to the core sampler. The claw spring has an annular structure at one end axially near the fixing part. The inner wall of the annular structure is slidably connected to the outer wall of the core tube at the end away from the fixing part. The claw spring at the end axially away from the fixing part is provided with multiple core claws. The outer wall of the multiple core claws is a second conical surface with the same taper as the first conical surface. The second conical surface can slide along the first conical surface towards or away from the fixing part. When the claw spring moves away from the fixing part with the core, the second conical surface can lock with the first conical surface, and the multiple core claws are locked onto the outer wall of the core.

7. The drill collar coring tool of claim 6, wherein: The inner wall of each core claw is provided with a unidirectional serrated structure along the axial direction of the core-taking cylinder to prevent the core from exiting the core-taking device.

8. The drill collar coring tool of any of claims 2-7, wherein: The drill bit is an impregnated diamond drill bit.

9. The drill collar coring tool of any of claims 2-7, wherein: The remote control device includes: A central flow channel valve, wherein the central flow channel valve is disposed in the central flow channel; A flexible tube valve, wherein the flexible tube valve is disposed at one end of the flexible tube near the central flow channel; and The control unit is communicatively connected to the central flow channel valve and the elastic tube valve. The control unit can open the elastic tube valve while closing the central flow channel valve, so that the drilling fluid flows into the elastic tube; the control unit can also close the elastic tube valve while opening the central flow channel valve, so that the drilling fluid flows out of the auger through the central flow channel.

10. A drilling apparatus, characterized by: include: One or more coring tools for drilling wellbore according to any one of claims 1 to 9, wherein the coring tool for drilling wellbore is connected to the drill string through the upper and lower ends of the auger stabilizer.

Images