A device for sampling the side wall of an ultra-deep borehole

Abstract

The present invention discloses an ultra-deep borehole sidewall sampling device, comprising a bearing shell, a bearing component disposed within the bearing shell, and a sampling component rotatably disposed on the bearing component; the bearing component comprises a bearing plate transversely disposed within the bearing shell, a core rod disposed on a side of the bearing plate proximal to the bearing shell wall, and the core rod connected to the bearing shell via a guide head at one end thereof facing away from the bearing plate; the sampling component comprises a core disk sleeved on the outer wall of the core rod, the core disk being capable of sliding along the extension direction of the core rod and rotating along the axis of the core rod; at least two sets of sampling assemblies are slidably accommodated on the core disk, the two ends of the sampling assemblies respectively extending through the core disk, and both ends of the sampling assemblies passing through the core disk are located in the sliding direction of the core disk; a power assembly is used to drive the sampling assemblies to extend out of the opening to sample the borehole sidewall, and is also used to drive the core disk to rotate so as to replace the position of the sampling assemblies. This enables the mechanism to be lowered once and perform multiple core sampling operations, greatly improving efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of sampling devices, and in particular to an ultra-deep borehole sidewall sampling device. Background Art

[0002] With the development of the national economy, the consumption of mineral resources has increased annually. Mineral resource exploration is shifting towards deeper prospecting. At the same time, in recent years, geological disasters have become frequent worldwide, particularly earthquakes, posing a significant threat to human survival and safety. Therefore, deep earth exploration, understanding deep strata, and studying earthquake mechanisms are gaining increasing attention. Related resource exploration and geological research require deep drilling as technical support. To meet the demands of these increasingly in-depth studies, drilling is inevitably moving towards deep and ultra-deep boreholes.

[0003] The construction method of ultra-deep holes is often based on core drilling technology. During construction, it is often required to obtain all or part of the underground geological physical data, and various analyses are carried out on the ground through various means to obtain underground stratigraphic information. Drilling and coring ultra-deep holes is a difficult task. Due to various reasons, cores are often lost or even cannot be obtained during coring in ultra-deep holes. At this time, it is necessary to use sidewall sampling technology to supplement the core. Existing sampling equipment has the problem of low sampling efficiency after a single sampling in ultra-deep boreholes. The core is incomplete and continuous, making it difficult to achieve geological purposes. Therefore, there is an urgent need to create a device that can extract complete and continuous cores multiple times in one trip to solve this problem. Summary of the Invention

[0004] The main purpose of the present invention is to provide an ultra-deep borehole sidewall sampling device, aiming to solve the technical problem in the prior art that the sampling equipment can only perform one sampling operation during a single downhole operation.

[0005] To achieve the above-mentioned object, the present invention proposes an ultra-deep borehole sidewall sampling device, comprising a bearing shell, a bearing component is provided in the bearing shell, and a sampling component is rotatably provided on the bearing component;

[0006] The bearing component includes a bearing plate arranged transversely in the bearing shell, a core rod is provided on a side of the bearing plate close to the wall of the bearing shell, and an end of the core rod facing away from the bearing plate is connected to the bearing shell through a guide head;

[0007] The sampling component includes a core disk sleeved on the outer wall of the core rod, the core disk being able to slide along the extension direction of the core rod and rotate along the axis of the core rod, and at least two sets of sampling assemblies are slidably accommodated on the core disk, with both ends of the sampling assemblies passing through the core disk respectively, and both ends of the sampling assemblies passing through the core disk are located in the sliding direction of the core disk;

[0008] The sampling component further includes a power assembly disposed on a side of the core disc away from the guide head, wherein the extending direction of the sampling assembly is inclined toward one side of the power assembly and intersects with the core rod, and an opening is formed on the wall of the carrier shell for allowing an end of the sampling assembly away from the power assembly to extend out of the carrier shell;

[0009] The power assembly is used to drive the sampling assembly to extend out of the opening to sample the side wall of the borehole, and is also used to drive the core disk to rotate so that the position of the sampling assembly is replaced.

[0010] Preferably, the power assembly includes a slider slidably arranged on the core rod, a hydraulic motor is provided on the side of the slider away from the core rod, the output shaft of the hydraulic motor is arranged toward the side close to the core disk, a soft shaft is connected to the output shaft of the hydraulic motor, a connecting piece for connecting to the sampling assembly is provided on the side of the soft shaft away from the hydraulic motor, an oil cylinder for driving the hydraulic motor to move toward or away from the core disk is provided on the side of the hydraulic motor away from the soft shaft, and the end of the oil cylinder away from the hydraulic motor is connected to the core rod.

[0011] Preferably, a plurality of receiving holes are formed around and through the core disk in the sliding direction, each of the receiving holes is inclined toward the direction of the core rod on which the power assembly is arranged, and the sampling assembly includes a core tube arranged in each receiving hole in a one-to-one correspondence;

[0012] The wall of the receiving hole is laterally recessed to form a receiving groove, the outer wall of the core tube is sleeved with a spring, the spring is located in the receiving groove, and an end of the core tube close to the power assembly is provided with a limit plate located in the receiving groove to prevent the core tube from escaping from the receiving hole; one side of the spring is in conflict with the side of the limit plate close to the core tube, and the other side is in conflict with the wall of the receiving groove;

[0013] The side of the limit plate away from the core tube is used to connect the connecting piece so that the flexible shaft can drive the core tube to rotate. The side of the core tube away from the power assembly is provided with a drill bit for allowing the sample to enter the core tube.

[0014] Preferably, the power assembly further comprises a first spline, a slide cylinder, a first connecting rod, a second connecting rod, a third connecting rod, a second spline and a reversing ring;

[0015] The first spline is wound around the outer wall of the core rod, the slide cylinder is slidably arranged on the outer wall of the first spline, the second spline is arranged on the inner wall of the slide cylinder and meshes with the first spline, the center of the core disk is penetrated to form a through hole for being sleeved on the outer wall of the core rod, the reversing ring is arranged on the inner wall of the through hole, the axis of the reversing ring coincides with the axis of the through hole, the inner wall of the reversing ring is provided with a third spline for meshing with the first spline, the slide cylinder is located on the side of the core disk away from the guide head, the slide cylinder is close to the side of the core disk and is surrounded by a plurality of convex teeth, the reversing ring is away from A plurality of tooth grooves are formed around the ring opening on one side of the guide head to cooperate with the convex teeth, a first inclined surface is formed on the side of the convex tooth facing away from the slide cylinder, a second inclined surface is formed on the groove wall of the tooth groove to cooperate with the first inclined surface, the first spline cooperates with the second spline and the third spline to limit the sliding of the slide cylinder and the reversing ring along the extension direction of the core rod, a third inclined surface is formed on the side of the third spline facing away from the guide head, a fourth inclined surface is formed on the side of the first spline close to the guide head to cooperate with the third inclined surface, and the inclination directions of the first inclined surface and the third inclined surface are in the same direction;

[0016] When the core rod is perpendicular to the third spline and meshes with the first spline, the first inclined surface of the convex tooth is located above the second inclined surface of the tooth groove, and the convex tooth is away from the tooth groove; when the core rod is perpendicular to the convex tooth and meshes with the tooth groove key, the third spline is disengaged from the first spline, and the third inclined surface of the third spline is located below the fourth inclined surface of the first spline;

[0017] One end of the first connecting rod is hinged to the outer wall of the slider, and the other end is hinged to one end of the second connecting rod. The rod body of the second connecting rod is rotatably set on the core rod, and the second connecting rod is located on the side of the slider away from the guide head. The side of the second connecting rod away from the first connecting rod is hinged to one end of the third connecting rod, and the end of the third connecting rod away from the second connecting rod is hinged to the outer wall of the slide cylinder;

[0018] An elastic component that contacts the guide head is provided on a side of the core disc close to the guide head, and the elastic component is used to drive the core disc to move toward a side away from the guide head.

[0019] Preferably, the power assembly further comprises a wall-resting mechanism for causing the bearing shell to press against the hole wall.

[0020] Preferably, the wall-leaning mechanism includes a fourth connecting rod, a fifth connecting rod and a resistance block;

[0021] One end of the fourth connecting rod is hinged to one end of the fifth connecting rod, and the other end is rotatably connected to the outer wall of the hydraulic motor. The end of the fifth connecting rod facing away from the fourth connecting rod is hinged to the outer wall of the core rod, and the resistance block is rotatably connected to the position where the fourth connecting rod and the fifth connecting rod are hinged.

[0022] Preferably, the connecting member includes a first connecting block disposed at one end of the flexible shaft away from the hydraulic motor, and a second connecting block disposed on the side of the limiting plate away from the core barrel;

[0023] On the side of the first connecting block away from the rotating shaft, at least one inserting rod is distributed at intervals, and a clamping block is arranged on the rod wall of the inserting rod; on the side of the second connecting block away from the limiting plate, a socket corresponding to the number of the inserting rods and for the inserting rod to insert is recessed, and a clamping groove for the clamping block to extend into is laterally recessed on the hole wall of the socket; the aperture of the socket can allow the clamping block and the inserting rod to extend into the socket at the same time.

[0024] Preferably, at least one inserting block is arranged at one end of the limiting plate away from the spring, and a slot for the inserting block to insert is recessed on the groove wall of the receiving groove.

[0025] Preferably, a retaining spring is arranged in the core barrel.

[0026] Preferably, a hydraulic system for providing power to the oil cylinder and the hydraulic motor is further arranged in the bearing housing, and the hydraulic system includes an oil pump, a hydraulic oil tank and an electro-hydraulic valve;

[0027] The hydraulic oil tank is used for storing hydraulic oil; the oil pump is used for conveying the hydraulic oil in the hydraulic oil tank to the electro-hydraulic valve, and the electro-hydraulic valve is used for providing hydraulic power to the oil cylinder and the hydraulic motor.

[0028] In the technical solution of the present invention, during sampling, the bearing housing is hoisted into the ultra-deep borehole with the sampling assembly in the posture below the power assembly. After the sampling device reaches the sampling position, the power assembly drives the sampling assembly to extend out from the opening. Because the sampling assembly is inclined, after the sampling assembly extends out of the opening, the sampling assembly can contact the hole wall of the ultra-deep borehole. Then, the power assembly drives the sampling assembly to extend out of the opening to sample the side wall of the borehole. After sampling is completed, the power assembly drives the sampling assembly to return. When sampling next time, the power assembly rotates the core disc to replace the position of the sampling assembly that has not been sampled with the position of the sampled sampling assembly, and then samples again, so as to realize that the sampling device can sample the side wall of the ultra-deep borehole multiple times with one trip into the well, without having to take out the sampling device again after each sampling, saving the time consumed by tripping in and out of the hole, enabling the mechanism to take multiple cores with one trip down, greatly improving the efficiency. It is mainly a mechanical structure and can still be applicable in the ultra-deep hole with high temperature and high pressure environment; it is equipped with multiple core barrels, and each core is stored separately, protecting the core to the greatest extent and being better distinguishable; by reducing the number of tripping in and out of the hole, the occurrence of downhole accidents is reduced. Description of the Drawings

[0029] 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 for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0030] Figure 1 Schematic diagram of the overall structure of the present invention;

[0031] Figure 2 Schematic diagram of the power component structure of the present invention;

[0032] Figure 3 Schematic diagram of the structure of the first spline of the present invention provided on the core rod;

[0033] Figure 4 Schematic diagram of the state structure in which the convex teeth of the present invention enter the tooth grooves;

[0034] Figure 5 Schematic diagram of the state structure in which the third spline and the first spline of the present invention are engaged;

[0035] Figure 6 Schematic diagram of the state structure in which the third spline of the present invention moves out of the first spline;

[0036] Figure 7 Schematic diagram of the state structure in which the third inclined plane of the third spline of the present invention is located below the fourth inclined plane of the first spline;

[0037] Figure 8 Schematic diagram of the state structure in which the third spline of the present invention enters another adjacent key groove after the third inclined plane of the third spline abuts against the fourth inclined plane of the first spline;

[0038] Figure 9 Schematic diagram of the commutating ring structure of the present invention;

[0039] Figure 10 Schematic diagram of the sampling component structure of the present invention;

[0040] Figure 11 For the present invention Figure 10 Partial enlarged structure schematic diagram of area A therein;

[0041] Figure 12 Schematic diagram of the connecting member structure of the present invention;

[0042] Figure 13 Schematic diagram of the state structure in which the clamping block of the present invention is located in the clamping groove;

[0043] Figure 14Schematic structural diagram of the state where the clamping block and the insertion rod of the present invention are located within the jack.

[0044] Explanation of the reference numerals in the attached drawings:

[0045] 1. Bearing housing; 1a. Opening; 2. Sampling component; 21. Core plate; 21a. Receiving hole; 21b. Receiving groove; 22. Sampling assembly; 221. Core tube; 222. Spring; 223. Limiting plate; 224. Drill bit; 225. Stop spring; 226. Insert block; 227. Insert slot; 23. Power component; 231. Hydraulic motor; 232. Flexible shaft; 233. Slide block; 234. Oil cylinder; 235. First connecting rod; 236. Second connecting rod; 237. Third connecting rod; 238. First spline; 239. Commutating ring; 2310. Third spline; 2311. Convex tooth; 2312. Tooth groove; 2313. Slide cylinder; 2314. Elastic component; 24. Wall contact mechanism; 241. Fourth connecting rod; 242. Fifth connecting rod; 243. Contact block; 25. Connecting piece; 251. First connecting block; 252. Second connecting block; 253. Insertion rod; 254. Clamping block; 255. Jack; 256. Card slot; 3. Bearing component; 31. Core rod; 32. Guide head; 33. Bearing plate; 4. Hoisting ring; 5. Armored cable; 6. Hydraulic system; 61. Electric control hydraulic valve; 62. Oil pump; 63. Hydraulic oil tank.

[0046] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0047] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0048] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0049] In addition, in the present invention, descriptions such as "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0050] In the present invention, unless otherwise clearly specified and defined, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In addition, the technical solutions between various embodiments of the present invention can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0052] The present invention provides a device for sampling the side wall of a ultra-deep borehole.

[0053] Please refer to Figures 1 to 14 , the device for sampling the side wall of a ultra-deep borehole includes a bearing shell 1, a bearing component 3 is arranged inside the bearing shell 1, and a sampling component 2 is rotatably arranged on the bearing component 3;

[0054] The bearing component 3 includes a bearing plate 33 horizontally arranged inside the bearing shell 1. A core rod 31 is arranged on one side of the bearing plate 33 close to the shell wall of the bearing shell 1. One end of the core rod 31 away from the bearing plate 33 is connected to the bearing shell 1 through a guide head 32;

[0055] The sampling component 2 includes a core disk 21 sleeved on the outer wall of the core rod 31. The core disk 21 can slide along the extension direction of the core rod 31 and rotate around the axis of the core rod 31. At least two groups of sampling assemblies 22 are slidably received on the core disk 21. Both ends of the sampling assembly 22 penetrate through the core disk 21 respectively, and both ends of the sampling assembly 22 penetrating through the core disk 21 are located in the sliding direction of the core disk 21;

[0056] The sampling component 2 further includes a power assembly 23 disposed on the side of the core disc 21 away from the guide head 32. The extending direction of the sampling assembly 22 is inclined toward the side of the power assembly 23 and intersects with the core rod 31. An opening 1a is formed on the wall of the bearing housing 1 for the end of the sampling assembly 22 away from the power assembly 23 to extend out of the bearing housing 1.

[0057] The power assembly 23 is used to drive the sampling assembly 22 to extend out of the opening 1a to sample the side wall of the drill hole, and is also used to drive the core disc 21 to rotate so as to replace the position of the sampling assembly 22.

[0058] In the technical solution of the present invention, during sampling, the bearing housing 1 is hoisted into the ultra-deep drill hole in the posture where the sampling assembly 22 is below the power assembly 23. After the sampling device reaches the sampling position, the power assembly 23 drives the sampling assembly 22 to extend out of the opening 1a. Because the sampling assembly 22 is inclined, after the sampling assembly 22 extends out of the opening 1a, the sampling assembly 22 can contact the wall of the ultra-deep drill hole. Then, the power assembly 23 drives the sampling assembly 22 to extend out of the opening 1a to sample the side wall of the drill hole. After sampling is completed, the power assembly 23 drives the sampling assembly 22 to return to its original position. When sampling next time, the power assembly 23 rotates the core disc 21 to replace the position of the sampling assembly 22 that has not been sampled with the position of the sampling assembly 22 that has been sampled, and then sampling is carried out again, so as to enable the sampling device to sample the side wall of the ultra-deep drill hole multiple times with one trip into the well, without having to take out the sampling device again after each sampling, saving the time consumed for hoisting and lowering the drill, enabling the mechanism to take cores multiple times with one lowering, greatly improving the efficiency; by reducing the number of hoisting and lowering operations, the occurrence of downhole accidents is reduced.

[0059] Please refer to the appendix Figure 2 As shown, the power assembly 23 includes a slider 233 slidably disposed on the core rod 31. A hydraulic motor 231 is provided on the side of the slider 233 away from the core rod. The output shaft of the hydraulic motor 231 is arranged toward the side close to the core disc 21. A flexible shaft 232 is connected to the output shaft of the hydraulic motor 231. A connecting member 25 for connecting with the sampling assembly 22 is provided on the side of the flexible shaft 232 away from the hydraulic motor 231. An oil cylinder 234 for driving the hydraulic motor 231 to move toward or away from the core disc 21 is provided on the side of the hydraulic motor 231 away from the flexible shaft 232. The end of the oil cylinder 234 away from the hydraulic motor 231 is connected to the core rod 31. By the telescopic movement of the oil cylinder 234, the hydraulic motor 231 can be driven to slide on the core rod 31. The sampling assembly 22 is initially inclined in the core disc 21. In this way, when coring, the sampling assembly 22 can directly pass through the opening 1a obliquely to core the rock wall.

[0060] Please refer to the appendix Figures 10 - 11, a plurality of receiving holes 21a are formed around and through the core plate 21 in the sliding direction thereof, and each of the receiving holes 21a is inclined toward the core rod 31 of the power assembly 23. The sampling assembly 22 includes core tubes 221 respectively disposed in each of the receiving holes 21a in a one-to-one correspondence;

[0061] A receiving groove 21b is formed by a lateral circumferential depression on the inner wall of the receiving hole 21a. A spring 222 is sleeved on the outer wall of the core tube 221. The spring 222 is located in the receiving groove 21b. A limiting plate 223 is provided at one end of the core tube 221 close to the power assembly 23 to prevent the core tube 221 from detaching from the receiving hole 21a within the receiving groove 21b. One side of the spring 222 abuts against one side of the limiting plate 223 close to the core tube 221, and the other side abuts against the wall of the receiving groove 21b;

[0062] The side of the limiting plate 223 facing away from the core tube 221 is used to connect the connecting member 25 so that the flexible shaft 232 can drive the core tube 221 to rotate. A drill bit 224 is provided on the side of the core tube 221 facing away from the power assembly 23 for allowing the sample to enter the core tube 221. When the oil cylinder 234 drives the hydraulic motor 231 to move toward the core plate 21, the connecting member 25 on the flexible shaft 232 will be connected to the core tube 221, and the side of the core tube 221 facing away from the limiting plate 223 will be pushed out of the opening 1a. At this time, the limiting rod moves to compress the spring 222, and the power provided by the hydraulic motor 231 is used to drill and sample the rock wall by the drill bit 224. The taken sample will be retained in the core tube 221. After the sampling is completed, the oil cylinder 234 drives the hydraulic motor 231 to move away from the core plate 21. At the same time, the spring 222 releases its elastic potential energy, drives the core tube 221 into the receiving hole 21a through the limiting plate 223, thereby preventing the core tube 221 from detaching from the core plate 21.

[0063] Please refer to the appendix Figures 2 - 9 , the power assembly 23 further includes a first spline 238, a sliding cylinder 2313, a first connecting rod 235, a second connecting rod 236, a third connecting rod 237, a second spline, and a commutation ring 239;

[0064] The first spline 238 is wound around the outer wall of the core rod 31, and the slide 2313 is slidably arranged on the outer wall of the first spline 238. The second spline is arranged on the inner wall of the slide 2313 and meshed with the first spline 238. The center of the core disk 21 is formed with a through hole for being sleeved on the outer wall of the core rod 31. The reversing ring 239 is arranged on the inner wall of the through hole. The axis of the reversing ring 239 coincides with the axis of the through hole. The inner wall of the reversing ring 239 is provided with a third spline 2310 for meshing with the first spline 238. The slide 2313 is located on the side of the core disk 21 away from the guide head 32. The slide 2313 is close to the side of the core disk 21 and is surrounded by a plurality of convex teeth 2311. A plurality of tooth grooves 2312 that cooperate with the convex teeth 2311 are formed around the ring opening on the side of the ring 239 facing away from the guide head 32. The convex teeth 2311 are formed with a first inclined surface on the side facing away from the slide 2313. A second inclined surface that cooperates with the first inclined surface is formed on the groove wall of the tooth groove 2312. The first spline 238 cooperates with the second spline and the third spline 2310 to limit the sliding of the slide 2313 and the reversing ring 239 along the extension direction of the core rod 31. The third spline 2310 is formed with a third inclined surface on the side facing away from the guide head 32. The first spline 238 is formed with a fourth inclined surface that cooperates with the third inclined surface on the side close to the guide head 32. The inclination directions of the first inclined surface and the third inclined surface are in the same direction.

[0065] When the core rod 31 is perpendicular to the third spline 2310 and meshes with the first spline 238, the first inclined surface of the protruding tooth 2311 is located above the second inclined surface of the tooth groove 2312, and the protruding tooth 2311 is away from the tooth groove 2312; when the core rod 31 is perpendicular to the protruding tooth 2311 and meshes with the tooth groove 2312, the third spline 2310 and the first spline 238 are disengaged, and the third inclined surface of the third spline 2310 is located below the fourth inclined surface of the first spline 238;

[0066] One end of the first connecting rod 235 is hinged to the outer wall of the slider 233, and the other end is hinged to one end of the second connecting rod 236. The rod body of the second connecting rod 236 is rotatably mounted on the core rod 31, and the second connecting rod 236 is located on the side of the slider 233 away from the guide head 32. The side of the second connecting rod 236 away from the first connecting rod 235 is hinged to one end of the third connecting rod 237. The end of the third connecting rod 237 away from the second connecting rod 236 is hinged to the outer wall of the slide cylinder 2313.

[0067] An elastic component 2314 that contacts the guide head 32 is provided on a side of the core disc 21 close to the guide head 32 . The elastic component 2314 is used to drive the core disc 21 to move toward a side away from the guide head 32 .

[0068] The slider 233 is connected to the core rod 31 via a first spline 238 and a second spline, ensuring that the slider 233 can slide up and down on the core rod 31 but cannot rotate. A reversing ring 239 is provided on the inner side of the upper portion of the core disc 21. Under normal circumstances, the elastic component 2314 is only subjected to the deadweight of the core disc 21. The third spline 2310 and the first spline 238 cooperate to ensure that the core disc 21 does not rotate. When the elastic component 2314 is subjected to greater longitudinal pressure, the core disc 21 moves downward, the third spline 2310 disengages from the first spline 238, and the core disc 21 can rotate around the core rod 31. During the coring process, the elastic component 2314 is always in a normal state, and the core disc 21 and the core rod 31 remain stationary, ensuring a smooth and stable coring process. When a full tube of core is taken, the oil cylinder 234 drives the hydraulic motor 231 upward. After the connector 25 is disengaged from the core tube 221, it continues to push the slider 233 upward along the core rod 31. The movement of the slider 233 drives the first connecting rod 235 upward to push the second connecting rod 236 away from one end of the third connecting rod 237, causing the end of the third connecting rod 237 away from the second connecting rod 236 to move toward the side close to the slide 2313, forcing the slide 2313 to move toward the side close to the core plate 21. The slide 2313 drives the core plate 21 to slide along the core rod 31 toward the side close to the guide head 32 while compressing the elastic component 2314. After the core plate 21 moves downward for a distance, the spline fit between the tube plate and the core rod 31 fails.

[0069] At this point, slide 2313 continues to move toward the side closest to core plate 21. The first inclined surface of the protruding tooth 2311 on slide 2313 comes into contact with the second inclined surface of the tooth groove 2312. Guided by the first and second inclined surfaces, core plate 21 rotates horizontally a certain angle around core rod 31. At the start of the next coring round, hydraulic motor 231 moves downward, eliminating the downward force on slide 2313. Under the action of elastic member 2314, core plate 21 slides away from guide head 32. Because core plate 21 has already rotated a certain angle, as it slides upward, the third inclined surface of the third spline 2310 comes into contact with the fourth inclined surface of the first spline 238. Guided by the third and fourth inclined surfaces, the teeth of the third spline 2310 slide into the adjacent keyway of the first spline 238. Before the next engagement of the connecting member 25 with the core barrel 221 , the core disc 21 completes the rotation of the set angle.

[0070] Nine empty core tubes 221 are placed in the core tray 21. The tooth fit between the slide 2313 and the core tray 21 and the spline fit between the core rod 31 and the core tray 21 are designed according to the number of core tubes 221. This ensures that after the core tray 21 rotates, the new tube is exactly in the position of the old tube, thereby completing the tube replacement action.

[0071] In addition, each core tube 221 has a drill bit 224, rather than all core tubes 221 sharing one drill bit 224. This way, the wear of a single drill bit 224 during each coring operation will be relatively small. If only one drill bit 224 is used, the drill bit 224 may become worn and unusable before coring is completed. In this case, the drill bit must be lifted, which greatly reduces the efficiency of drilling and sampling, and is time-consuming and labor-intensive. When each core tube 221 is equipped with a drill bit 224, the wear of one drill bit 224 is averaged over several drill bits 224, thus greatly reducing the wear of each drill bit 224 during a coring cycle. Each time the drill bit is lifted, we can immediately inspect and record the drill bit 224 to ensure that the drill bit 224 works well each time we drill.

[0072] Please refer to the attached Figure 1 The power assembly 23 further includes a wall-leaning mechanism 24 for pressing the bearing shell 1 against the hole wall. The wall-leaning mechanism 24 is used to press the sampling device against the hole wall of the ultra-deep borehole in the direction in which the core tube 221 is exposed.

[0073] Please refer to the attached Figure 1 The wall-leaning mechanism 24 includes a fourth connecting rod 241, a fifth connecting rod 242 and a resisting block 243;

[0074] One end of the fourth connecting rod 241 is hinged to one end of the fifth connecting rod 242, and the other end is rotatably connected to the outer wall of the hydraulic motor 231. The end of the fifth connecting rod 242 facing away from the fourth connecting rod 241 is hinged to the outer wall of the core rod 31. The resistance block 243 is rotatably connected to the position where the fourth connecting rod 241 and the fifth connecting rod 242 are hinged. The supporting shell 1 is also provided with an outlet for the resistance block 243 to extend out of the supporting shell 1. When a coring cycle is about to begin, hydraulic motor 231 begins to move downward. At this point, fourth and fifth connecting rods 241 and 242 move toward each other, and their abutment block 243 moves toward the exit, passing through support shell 1 and abutting against the ultra-deep borehole wall. This squeezes the entire sampling device against the ultra-deep borehole wall in the direction of core barrel 221's emergence. This reduces the distance between the sampling device and the borehole wall, increasing the effective length for coring; it also keeps the entire device relatively fixed to the wellbore wall, counteracting the reaction force during coring. After coring is complete, hydraulic motor 231 moves upward, and fourth and fifth connecting rods 241 and 242 move away from each other, allowing abutment block 243 to enter support shell 1 and disengage the entire device from the ultra-deep borehole wall.

[0075] Please refer to the attached Figures 12 - 14 The connecting member 25 includes a first connecting block 251 provided at one end of the flexible shaft 232 away from the hydraulic motor 231 , and a second connecting block 252 provided at one side of the limiting plate 223 away from the core barrel 221 ;

[0076] On one side of the first connecting block 251 facing away from the rotating shaft, at least one inserting rod 253 is distributed at intervals, and a clamping block 254 is arranged on the rod wall of the inserting rod 253; on one side of the second connecting block 252 facing away from the limiting plate 223, a plurality of inserting holes 255 corresponding to the number of the inserting rods 253 and for the inserting rods 253 to insert are formed by recessing, and a clamping groove 256 for the clamping block 254 to extend into is formed by laterally recessing on the hole wall of the inserting hole 255; the aperture of the inserting hole 255 can allow both the clamping block 254 and the inserting rod 253 to extend into the inserting hole 255. When connecting, start the hydraulic motor 231 to rotate the first connecting block 251, and under the drive of the oil cylinder 234, continue to move towards the side close to the core disc 21, so that the inserting rod 253 and the clamping block 254 enter the inserting hole 255, and with the rotation of the first connecting block 251, the clamping block 254 will enter the clamping groove 256. In this way, the flexible shaft 232 and the core barrel 221 can be tightly connected together to transmit pressure and torque. After coring, the hydraulic motor 231 moves upward, and can also provide an upward pulling force to break the core.

[0077] Please refer to the appendix Figure 11 , at least one inserting block 226 is arranged at one end of the limiting plate 223 facing away from the spring 222, and a slot 227 for the inserting block 226 to insert is formed by recessing on the slot wall of the receiving groove 21b. When the connector 25 is separated from the core barrel 221, due to the design similar to the clamping groove 256 at the joint, it is necessary to consider the situation that the core barrel 221 may rotate in reverse along with the flexible shaft 232, resulting in the inability to separate the core barrel 221 from the flexible shaft 232. Considering the possible occurrence of this situation, a positioning mechanism is designed on the basis of the design of the limiting plate 223 of the core barrel 221;

[0078] At least one inserting block 226 is designed on the limiting plate 223. In this way, when the side of the limiting plate 223 facing away from the spring 222 leans against the slot wall of the receiving groove 21b, the inserting block 226 inserts into the slot 227, so that the core barrel 221 cannot rotate under the drive of the flexible shaft 232, and the first connecting block 251 and the second connecting block 252 can be separated.

[0079] When the first connecting block 251 rotates in reverse to separate from the second connecting block 252, the inserting block 226 may not be exactly stuck in the slot 227, but with the rotation of the first connecting block 251, the inserting block 226 will slowly fit with the slot 227. At this time, the core barrel 221 stops rotating, while the first connecting block 251 continues to rotate in reverse. In this way, the clamping block 254 will move out of the clamping groove 256, so that the clamping block 254 and the inserting rod 253 are located in the inserting hole 255. At the same time, due to the continuous upward lifting of the flexible shaft 232, the clamping block 254 and the inserting rod 253 can move out of the inserting hole 255, realizing the separation of the first connecting block 251 and the second connecting block 252.

[0080] If, after the core barrel 221 reaches its position, the insertion block 226 does not get stuck in the slot 227 and the core barrel 221 does not rotate with the reverse rotation of the drill pipe, the first connecting block 251 can still be separated. In this case, the problem of the insertion block 226 does not need to be considered because the design of the insertion block 226 mainly exists for the separation of the first connecting block 251 and the second connecting block 252, and whether the insertion block 226 is properly returned does not affect the operation of the mechanism. And the core barrel 221 can be firmly fixed on the inner wall of the receiving hole 21a under the action of the spring 222.

[0081] Please refer to the appendix Figure 10 , a retaining spring 225 is provided inside the core barrel 221. By providing a retaining spring 225 on each core barrel 221, the core recovery rate can be increased for fractured formations.

[0082] Please refer to the appendix Figure 1 , a hydraulic system 6 for providing power to the oil cylinder 234 and the hydraulic motor 231 is further provided inside the bearing housing 1. The hydraulic system 6 includes an oil pump 62, a hydraulic oil tank 63, and an electro-hydraulic control valve 61;

[0083] The hydraulic oil tank 63 is used to store hydraulic oil; the oil pump 62 is used to transport the hydraulic oil in the hydraulic oil tank 63 to the electro-hydraulic control valve 61, and the electro-hydraulic control valve 61 is used to provide hydraulic power to the oil cylinder 234 and the hydraulic motor 231. The hydraulic system 6 of the device is integrated inside the bearing housing 1. A lifting ring 4 is provided on the bearing housing 1, and an armored cable 5 is connected to the lifting ring 4 and is connected to the ground operation end through the armored cable 5 for controlling the operation of the hydraulic cylinders 234 and the hydraulic motors 231 of the mechanical device part. By operating the armored cable 5 by the personnel on the wellhead, the sampling device is pulled up and lowered to the next coring position; when using the armored cable to lower, there is no need to trip the drill, and at the same time, multiple samples can be taken in one lowering, with high efficiency.

[0084] In the specific implementation manner, the sampling device is lowered to the predetermined coring position through the armored cable 5.

[0085] After the device reaches the predetermined position, the ground control panel is operated to make the oil cylinder 234 extend and drive the hydraulic motor 231 to move downward. During the downward movement of the motor, the wall-leaning mechanism 24 slowly opens, forcing the entire device to move on the side where the core barrel 221 is exposed until it closely abuts against the well wall. At this time, the hydraulic motor 231 is rotated forward, and the motor continues to move downward. The flexible shaft 232 is connected to the core barrel 221 through the connecting member 25. Under the rotational force and pressure, the sampling pipe inclines into the formation to drill the core.

[0086] After the drilling is completed, operate the ground control panel. The oil cylinder 234 contracts, the hydraulic motor 231 moves upward, and the core barrel 221 breaks the core and retracts into the core tray 21. When the core barrel 221 returns to its initial position, operate the hydraulic motor 231 to reverse, and the connecting piece 25 disengages from the core barrel 221. During the upward movement of the hydraulic motor 231, the wall contact mechanism 24 slowly closes.

[0087] The hydraulic motor 231 continues to move upward, and the sliding cylinder 2313 pushes the core tray 21 downward to compress the elastic component 2314. After moving a certain distance, the third spline 2310 disengages from the first spline 238. The sliding cylinder 2313 continues to move downward, causing the core tray 21 to rotate clockwise by a certain angle. Turn off the hydraulic motor 231 and the oil cylinder 234 to complete the sidewall coring work for this round trip.

[0088] By pulling up or lowering the cable, move the sampling device to the next sampling position. Start the oil cylinder 234 to extend, the hydraulic motor 231 moves downward, the elastic component 2314 returns to its original state, and the core tray 21 moves upward. Because it rotated by a certain angle before, when moving upward, the spline teeth of the third spline 2310 slide into the keyway of the adjacent first spline 238 before, completing the rotation of the predetermined angle. This action is completed before the connecting piece 25 is connected to the core barrel 221. The rotation angle of the core tray 21 is designed to match the number of core barrels 221, ensuring that before the next round trip connection, the core barrel 221 filled with core rotates to the next position, and the empty core barrel 221 rotates directly below the connecting piece 25. Start the hydraulic motor 231 to rotate forward to start the coring work for the next round trip.

[0089] The above is only the preferred embodiment of the present invention, and does not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A device for sampling the side wall of an ultra - deep borehole, characterized in that, It comprises a carrying shell, wherein a carrying component is provided in the carrying shell, and a sampling component is rotatably provided on the carrying component; The bearing component includes a bearing plate arranged transversely in the bearing shell, a core rod is provided on a side of the bearing plate close to the wall of the bearing shell, and an end of the core rod facing away from the bearing plate is connected to the bearing shell through a guide head; The sampling component includes a core disk sleeved on the outer wall of the core rod, the core disk being able to slide along the extension direction of the core rod and rotate along the axis of the core rod, and at least two sets of sampling assemblies are slidably accommodated on the core disk, with both ends of the sampling assemblies passing through the core disk respectively, and both ends of the sampling assemblies passing through the core disk are located in the sliding direction of the core disk; The sampling component further includes a power assembly disposed on a side of the core disc away from the guide head, wherein the extending direction of the sampling assembly is inclined toward one side of the power assembly and intersects with the core rod, and an opening is formed on the wall of the carrier shell for allowing an end of the sampling assembly away from the power assembly to extend out of the carrier shell; The power assembly is used to drive the sampling assembly to extend out of the opening to sample the side wall of the borehole, and is also used to drive the core disk to rotate so that the position of the sampling assembly is replaced; The power assembly further includes a first spline, a slide cylinder, a first connecting rod, a second connecting rod, a third connecting rod, a second spline and a reversing ring; The first spline is wound around the outer wall of the core rod, the slide cylinder is slidably arranged on the outer wall of the first spline, the second spline is arranged on the inner wall of the slide cylinder and meshes with the first spline, the center of the core disk is penetrated to form a through hole for being sleeved on the outer wall of the core rod, the reversing ring is arranged on the inner wall of the through hole, the axis of the reversing ring coincides with the axis of the through hole, the inner wall of the reversing ring is provided with a third spline for meshing with the first spline, the slide cylinder is located on the side of the core disk away from the guide head, the slide cylinder is close to the side of the core disk and is surrounded by a plurality of convex teeth, the reversing ring is away from A plurality of tooth grooves are formed around the ring opening on one side of the guide head to cooperate with the convex teeth, a first inclined surface is formed on the side of the convex tooth facing away from the slide cylinder, a second inclined surface is formed on the groove wall of the tooth groove to cooperate with the first inclined surface, the first spline cooperates with the second spline and the third spline to limit the sliding of the slide cylinder and the reversing ring along the extension direction of the core rod, a third inclined surface is formed on the side of the third spline facing away from the guide head, a fourth inclined surface is formed on the side of the first spline close to the guide head to cooperate with the third inclined surface, and the inclination directions of the first inclined surface and the third inclined surface are in the same direction; When the core rod is perpendicular to the third spline and meshes with the first spline, the first inclined surface of the convex tooth is located above the second inclined surface of the tooth groove, and the convex tooth is away from the tooth groove; when the core rod is perpendicular to the convex tooth and meshes with the tooth groove key, the third spline is disengaged from the first spline, and the third inclined surface of the third spline is located below the fourth inclined surface of the first spline; One end of the first connecting rod is hinged to the outer wall of the slider, and the other end is hinged to one end of the second connecting rod. The rod body of the second connecting rod is rotatably set on the core rod, and the second connecting rod is located on the side of the slider away from the guide head. The side of the second connecting rod away from the first connecting rod is hinged to one end of the third connecting rod, and the end of the third connecting rod away from the second connecting rod is hinged to the outer wall of the slide cylinder; An elastic component that contacts the guide head is provided on the side of the core disc close to the guide head, and the elastic component is used to drive the core disc to move toward the side away from the guide head; The power assembly further comprises a wall-resting mechanism for causing the bearing shell to press against the hole wall.

2. The ultra-deep drilling sidewall sampling device according to claim 1, characterized in that, The power assembly includes a slider slidably arranged on the core rod, a hydraulic motor is provided on the side of the slider away from the core rod, the output shaft of the hydraulic motor is arranged toward the side close to the core disk, a flexible shaft is connected to the output shaft of the hydraulic motor, a connecting piece for connecting to the sampling assembly is provided on the side of the flexible shaft away from the hydraulic motor, an oil cylinder for driving the hydraulic motor to move toward or away from the core disk is provided on the side of the hydraulic motor away from the flexible shaft, and the end of the oil cylinder away from the hydraulic motor is connected to the core rod.

3. The ultra-deep drilling sidewall sampling device according to claim 2, characterized in that, A plurality of receiving holes are formed around and through the core disk in the sliding direction, each of the receiving holes is inclined toward the core rod of the power assembly, and the sampling assembly includes a core tube correspondingly arranged in each receiving hole; The wall of the receiving hole is laterally recessed to form a receiving groove, the outer wall of the core tube is sleeved with a spring, the spring is located in the receiving groove, and an end of the core tube close to the power assembly is provided with a limit plate located in the receiving groove to prevent the core tube from escaping from the receiving hole; one side of the spring is in conflict with the side of the limit plate close to the core tube, and the other side is in conflict with the wall of the receiving groove; The side of the limit plate away from the core tube is used to connect the connecting piece so that the flexible shaft can drive the core tube to rotate. The side of the core tube away from the power assembly is provided with a drill bit for allowing the sample to enter the core tube.

4. The ultra-deep drilling sidewall sampling device according to claim 1, characterized in that, The wall-leaning mechanism includes a fourth connecting rod, a fifth connecting rod and a resistance block; One end of the fourth connecting rod is hinged to one end of the fifth connecting rod, and the other end is rotatably connected to the outer wall of the hydraulic motor. The end of the fifth connecting rod facing away from the fourth connecting rod is hinged to the outer wall of the core rod, and the resistance block is rotatably connected to the position where the fourth connecting rod and the fifth connecting rod are hinged.

5. The ultra-deep drilling sidewall sampling device according to claim 3, characterized in that, The connecting member includes a first connecting block provided at one end of the flexible shaft away from the hydraulic motor, and a second connecting block provided at one side of the limit plate away from the core barrel; At least one insertion rod is spaced apart on one side of the first connecting block away from the rotating shaft, and a clamping block is provided on the rod wall of the insertion rod; a recess is formed on the side of the second connecting block away from the limiting plate to form insertion holes corresponding to the number of the insertion rods and for inserting the insertion rods, and a horizontal recess is formed on the hole wall of the insertion hole to form a clamping groove for the clamping block to extend into; the aperture of the insertion hole is capable of allowing the clamping block and the insertion rod to extend into the insertion hole at the same time.

6. The ultra-deep drilling sidewall sampling device according to claim 5, characterized in that, At least one inserting block is provided on one end of the limiting plate away from the spring, and a slot for inserting the inserting block is formed in a recessed manner on the slot wall of the receiving slot.

7. The ultra-deep drilling sidewall sampling device according to claim 3, characterized in that, A retaining spring is arranged in the core tube.

8. The ultra-deep drilling sidewall sampling device according to claim 2, characterized in that, The bearing shell is also provided with a hydraulic system for providing power to the oil cylinder and the hydraulic motor, and the hydraulic system includes an oil pump, a hydraulic oil tank and an electronically controlled hydraulic valve; The hydraulic oil tank is used to store hydraulic oil; the oil pump is used to transport the hydraulic oil in the hydraulic oil tank to the electronically controlled hydraulic valve, and the electronically controlled hydraulic valve is used to provide hydraulic power to the oil cylinder and the hydraulic motor.

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