A pressure relief device for a coring drill

Abstract

The utility model belongs to the pressure relief technical field of coring drilling tool, concretely relates to a kind of pressure relief processing device of coring drilling tool, including base, first frame body and rotating structure, conveying structure is provided on the base, for conveying drill rod;The first frame body is set on the base, and front end dismounting assembly and tail air release component are provided on first frame body, clamping mechanism is further provided on the first frame body, for clamping drill rod;The front end dismounting assembly includes the second frame body fixedly set on the first frame body, dismounting drill is slidably arranged on the second frame body, and dismounting drill is locked on the second frame body by first locking mechanism, and the dismounting drill is driven by first motor;The tail air release component includes the third frame body rotatably arranged on the first frame body, and the third frame body is driven by driving assembly, and the third frame body is provided with valve block by unloading valve component;Rotating structure is arranged on base, for driving drill rod rotation.

Description

Technical Field

[0001] This utility model belongs to the field of pressure relief technology for coring drills, and more specifically, it relates to a pressure relief device for coring drills. Background Technology

[0002] In fields such as geological exploration, mineral resource exploration, and oil and gas drilling, core drilling is a key technology for obtaining original rock and soil samples from underground strata, conducting geological analysis, and evaluating resources. This technology involves a drilling rig driving a drill rod and a coring tool connected to its bottom to rotate and drill. The coring bit cuts through the formation, allowing columnar rock cores to enter and be contained within the inner cylinder of the coring tool, thus enabling continuous extraction of formation cores.

[0003] During drilling, high-pressure drilling fluid (mud) is pumped to the bottom of the well through the drill pipe's internal cavity. After being ejected through the drill bit's water holes, it flows back to the surface along the annulus between the drill pipe and the wellbore. This serves to cool the drill bit, carry cuttings, balance formation pressure, and stabilize the wellbore. Once the predetermined drilling footage is completed, the coring tool, containing the core sample, must be pulled out of the wellhead as a whole. However, in practice, it has been found that the inner cylinder of the coring tool often experiences significant pressure after being pulled to the surface and before the core sample is removed.

[0004] The pressure mainly comes from two aspects: First, during drilling and hoisting, a small amount of drilling fluid or formation fluid may seep into the inner cylinder and fill the gaps or bottom of the core section. When the inner cylinder is brought to the surface, if its lower end is partially sealed by the core or core claw, the residual fluid will maintain a certain sealing pressure. Second, during the pressure release process, the core extracted from the deep high-pressure formation will release a large amount of dissolved gas, natural gas or volatile substances. These gases will rapidly accumulate and expand in the relatively closed inner cylinder space, causing the internal pressure to rise sharply.

[0005] If the inner cylinder is disassembled without effective depressurization, the high-pressure gas may instantly rupture the core claws or sealing structure, violently ejecting the entire core section, creating a "core projectile" effect. This seriously threatens the personal safety of on-site personnel and causes core fragmentation and stratigraphic disorder, severely affecting sample integrity and the accuracy of subsequent analysis. Currently, depressurization on-site is often achieved by manually opening simple valves or loosening joints. This method is not standardized, and the depressurization rate is difficult to control, posing significant safety risks and uncertainties.

[0006] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a pressure relief device for coring drills in order to achieve a more practical purpose. Utility Model Content

[0007] In view of the problems mentioned in the background art above, the present invention provides a pressure relief device for a core drilling tool.

[0008] The technical solution adopted by this utility model is as follows: A pressure relief device for a core drilling tool includes a base, a first frame, and a rotating structure. The base is provided with a conveying structure for conveying drill rods. The first frame is mounted on the base and includes a front disassembly assembly and a tail venting assembly. The first frame also includes a clamping mechanism for clamping the drill rods. The front disassembly assembly includes a second frame fixedly mounted on the first frame, on which a disassembly drill is slidably mounted. The disassembly drill is locked to the second frame by a first locking mechanism and is driven by a first motor. The tail venting assembly includes a third frame rotatably mounted on the first frame. The third frame is driven by a drive assembly and has a valve release block mounted on it via a valve release assembly. The rotating structure is mounted on the base and is used to drive the drill rods to rotate.

[0009] Furthermore, the conveying structure includes a worm gear screw jack and a support frame. The worm gear screw jack is driven by a second motor, and the support frame is located at the output end of the worm gear screw jack. A pair of auxiliary wheels are rotatably mounted on the support frame.

[0010] Furthermore, the clamping mechanism includes a first plate and two clamping blocks. A first cylinder is provided on the first frame. The output end of the first cylinder passes through the first frame and is fixedly connected to the first plate. A bidirectional lead screw is connected to the first plate. The two clamping blocks are respectively threaded at both ends of the bidirectional lead screw, and the clamping blocks are slidably connected to the bottom of the first plate. The bidirectional lead screw is driven by a third motor.

[0011] Furthermore, the first plate is provided with a plurality of rods, the top of the rods is connected to a second plate, the rods pass through the first frame body, and a compression spring is sleeved on the rods, the bottom of the compression spring is fixedly connected to the top of the first frame body.

[0012] Furthermore, the first locking mechanism includes a first lead screw mounted on the second frame, a first base connected to the first lead screw, and the first base being slidably connected to the second frame. The disassembly drill and the first motor are both mounted on the first base.

[0013] Furthermore, the drive assembly includes a fourth motor and a reducer connected to its output end. The output end of the reducer is provided with an output flange, which is fixedly connected to the third frame. The unloading valve assembly includes a second cylinder mounted on the third frame. The output end of the second cylinder is connected to the fourth frame. The bottom of the fourth frame is provided with a third cylinder, and the unloading valve block is driven by the third cylinder.

[0014] Furthermore, the rotating structure includes a second seat, which is slidably mounted on the base. A rotating ring is rotatably connected to the second seat, and a gear ring is provided on the outer circumference of the rotating ring. A first gear that matches the gear ring is rotatably mounted on the second seat, and the first gear is driven by a fifth motor.

[0015] Furthermore, the base is provided with a first guide rail and a second guide rail, the first guide rail being higher than the second guide rail, the second seat being slidably connected to the first guide rail, and the first frame being slidably connected to the second guide rail.

[0016] Furthermore, a second gear is rotatably connected to the second base, and the second gear is driven by a sixth motor. A first rack is provided on the inner side wall of the base, and the second gear meshes with the first rack.

[0017] Furthermore, a third gear is rotatably connected to the first frame, the third gear is driven by a seventh motor, and a second rack is installed on the outer wall of the base, the third gear meshing with the second rack.

[0018] The beneficial effects of this utility model are:

[0019] By integrating a conveying structure, clamping mechanism, front-end disassembly assembly, tail-end venting assembly, and rotating structure, a complete automated pressure relief system is formed. The conveying structure on the base enables smooth entry and exit of the drill rod, while the clamping mechanism on the first frame reliably fixes the drill rod, providing a stable foundation for subsequent operations. The front-end disassembly assembly drives the disassembly drill via a first motor and, in conjunction with a first locking mechanism, achieves precise positioning and automatic disassembly of the nut at the front of the drill bit. The rotating structure, combined with the rotation of the drill bit, effectively loosens the nuts around the drill bit. The tail-end venting assembly, through a drive assembly, rotates the third frame to the ball valve position at the tail of the drill bit. The valve release assembly then controls the valve release block to remotely and controllably open the ball valve, gradually releasing the high-pressure gas accumulated in the inner cylinder under controlled conditions. This integrated structure avoids the safety risks associated with close-range manual operation, significantly reduces the possibility of "core bomb" accidents due to sudden pressure relief, and simultaneously ensures the integrity and stratigraphic accuracy of core samples, improving the safety, standardization, and operational efficiency of coring drill bit processing. Attached Figure Description

[0020] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0021] Figure 1 This is a schematic diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the first frame and clamping mechanism of this utility model;

[0023] Figure 3 This is an exploded view of the first frame and clamping mechanism of this utility model;

[0024] Figure 4 This is a schematic diagram of the clamping mechanism of this utility model;

[0025] Figure 5 This is a schematic diagram of the rotating structure of this utility model;

[0026] Figure 6 This is a schematic diagram of the conveying structure of this utility model;

[0027] Figure 7 This is a schematic diagram of the base of this utility model;

[0028] The attached diagram is labeled as follows:

[0029] Base 100, first guide rail 101, second guide rail 102, first rack 103, second rack 104

[0030] Conveying structure 110, worm gear screw jack 111, second motor 112, support frame 113, auxiliary wheel 114.

[0031] Rotating structure 120, second base 121, rotating ring 122, gear ring 123, first gear 124, fifth motor 125, second gear 126, sixth motor 127.

[0032] First frame 200, first cylinder 201, compression spring 202, third gear 203, seventh motor 204.

[0033] Front disassembly assembly 210, second frame 211, first lead screw 212, first base 213, disassembly drill 214, first motor 215, eighth motor 216.

[0034] Tail exhaust assembly 220, third frame 221, fourth motor 222, reducer 223, second cylinder 224, fourth frame 225, third cylinder 226, unloading valve block 227.

[0035] Clamping mechanism 230, first plate 231, bidirectional lead screw 232, clamping block 233, third motor 234, rod 235, second plate 236. Detailed Implementation

[0036] like Figures 1 to 7As shown, a pressure relief device for a coring drill includes a base 100, a first frame 200, and a rotating structure 120. The base 100 is equipped with a conveying structure 110 for conveying drill rods. The first frame 200 is mounted on the base 100 and includes a front disassembly assembly 210 and a tail venting assembly 220. A clamping mechanism 230 is also provided on the first frame 200 for clamping the drill rods. The front disassembly assembly 210 includes a second frame fixedly mounted on the first frame 200. 211, a disassembly drill 214 is slidably disposed on the second frame 211, and the disassembly drill 214 is locked on the second frame 211 by a first locking mechanism. The disassembly drill 214 is driven by a first motor 215. The tail venting assembly 220 includes a third frame 221 rotatably disposed on the first frame 200. The third frame 221 is driven by a drive assembly. A valve release block 227 is disposed on the third frame 221 by a valve release assembly. The rotating structure 120 is disposed on the base 100 and is used to drive the drill rod to rotate.

[0037] By adopting the above technical solution, a complete automated pressure relief system is formed by integrating the conveying structure 110, clamping mechanism 230, front disassembly assembly 210, tail venting assembly 220, and rotating structure 120. The conveying structure 110 on the base 100 enables the smooth entry and exit of the drill rod, and the clamping mechanism 230 on the first frame 200 reliably fixes the drill rod, providing a stable foundation for subsequent operations. The front disassembly assembly 210 drives the disassembly drill 214 through the first motor 215, and in conjunction with the first locking mechanism, achieves precise positioning and automatic disassembly of the front nut of the drill bit. With the help of the rotating structure 120, the drill bit is rotated, effectively loosening the nuts around the drill bit. The tail venting assembly 220 drives the third frame 221 to rotate to the ball valve position at the tail of the drill bit through the drive assembly, and then the valve unloading assembly controls the valve unloading block 227 to move, realizing the remote and controllable opening of the ball valve, thereby gradually releasing the high-pressure gas accumulated in the inner cylinder under controlled conditions. This overall structure avoids the safety risks associated with close-range manual operation, significantly reduces the possibility of "core bomb" accidents caused by sudden pressure relief, and ensures the integrity and stratification accuracy of core samples, thereby improving the safety, standardization, and operational efficiency of coring drill processing.

[0038] As a preferred embodiment, the conveying structure 110 includes a worm gear screw jack 111 and a support frame 113. The worm gear screw jack 111 is driven by a second motor 112, and the support frame 113 is located at the output end of the worm gear screw jack 111. A pair of auxiliary rotating wheels 114 are rotatably mounted on the support frame 113. Figure 6As shown, the thread of the lead screw is not drawn in the figure. The conveying structure 110 achieves vertical lifting and lowering movement under the drive of the second motor 112 via the worm gear screw jack 111, which drives the support frame 113 and its auxiliary rotating wheel 114 to move up and down. The auxiliary rotating wheel 114 can rotate freely to support and allow the drill rod to roll forward or backward on it, realizing the smooth lifting and horizontal conveying of heavy drill rods. By adjusting the height of the support frame 113, it can adapt to the entry and exit of drill rods of different specifications. The auxiliary rotating wheel 114 reduces the frictional resistance between the drill rod and the support surface, making the drill rod enter or exit the processing station more smoothly, reducing the intensity of manual intervention, and improving the automation level and operational safety of the equipment.

[0039] As a preferred embodiment, the clamping mechanism 230 includes a first plate 231 and two clamping blocks 233. A first cylinder 201 is mounted on the first frame 200. The output end of the first cylinder 201 passes through the first frame 200 and is fixedly connected to the first plate 231. A bidirectional lead screw 232 is connected to the first plate 231. The two clamping blocks 233 are respectively threaded onto both ends of the bidirectional lead screw 232, and the clamping blocks 233 are slidably connected to the bottom of the first plate 231. The bidirectional lead screw 232 is driven by a third motor 234. Figure 4 As shown, the thread of the bidirectional lead screw 232 is not drawn. The first cylinder 201 drives the first plate 231 to move in the vertical direction, causing the clamping block 233 to approach or move away from the drill rod. When the clamping block 233 contacts the drill rod, the third motor 234 drives the bidirectional lead screw 232 to rotate, so that the two clamping blocks 233 move inward or outward synchronously, thereby achieving radial clamping or release of the drill rod.

[0040] As a preferred embodiment, the first plate 231 is provided with a plurality of rods 235, the top of which is connected to a second plate 236. The rods 235 pass through the first frame 200, and a compression spring 202 is sleeved on the rods 235. The bottom of the compression spring 202 is fixedly connected to the top of the first frame 200. The rods 235 connect the first plate 231 to the upper second plate 236. The compression spring 202 is sleeved on the outside of the rods 235, with one end fixed to the top of the first frame 200, and the other end contacting and compressing with the bottom of the second plate 236 as the first plate 231 moves, forming an elastic support system to prevent the first plate 231 from moving excessively downward under the action of the first cylinder 201.

[0041] As a preferred embodiment, the first locking mechanism includes a first lead screw 212 mounted on the second frame 211. A first seat 213 is threaded onto the first lead screw 212, and the first seat 213 is slidably connected to the second frame 211. The disassembly drill 214 and the first motor 215 are both mounted on the first seat 213. This structure enables automatic disassembly of the nut at the front end of the drill bit: the position of the disassembly drill 214 is adjusted by the first lead screw 212 to precisely align it with the nut, ensuring the stability of the disassembly drill 214 in operation, avoiding malfunctions, and improving operational safety and repeatability; the first motor 215 provides rotational power to the disassembly drill 214 to loosen the nut.

[0042] As a preferred embodiment, the drive assembly includes a fourth motor 222 and a reducer 223 connected to its output end. The reducer 223 has an output flange at its output end, which is fixedly connected to the third frame 221. The valve release assembly includes a second cylinder 224 mounted on the third frame 221. The output end of the second cylinder 224 is connected to the fourth frame 225. A third cylinder 226 is located at the bottom of the fourth frame 225, and the valve release block 227 is driven by the third cylinder 226. This structure achieves automated, remote-controlled pressure relief of the ball valve at the drill string tail: through multi-stage cylinder and mechanical linkage, close contact between the operator and the high-pressure drill string is avoided; the reducer 223 provides sufficient torque to overcome the starting torque of the ball valve under high pressure, ensuring reliable pressure relief. The entire process slowly releases the inner cylinder pressure under controlled conditions, effectively preventing the occurrence of the "core bomb" phenomenon.

[0043] As a preferred embodiment, the rotating structure 120 includes a second base 121, which is mounted on the base 100. A rotating ring 122 is rotatably connected to the second base 121. A gear ring 123 is provided on the outer periphery of the rotating ring 122. A first gear 124, which matches the gear ring 123, is rotatably mounted on the second base 121. The first gear 124 is driven by a fifth motor 125. The rotating ring 122 is rotatably connected to the second base 121, and its outer periphery is provided with a gear ring 123. The fifth motor 125 drives the first gear 124 to rotate, and the first gear 124 meshes with the gear ring 123, thereby driving the rotating ring 122 and the drill rod supported on it to rotate as a whole. When the disassembly drill 214 disassembles the nuts on the periphery of the drill bit, it is convenient to quickly rotate to the disassembly position of the next nut after disassembling one nut.

[0044] As a preferred embodiment, the base 100 is provided with a first guide rail 101 and a second guide rail 102, the first guide rail 101 being higher than the second guide rail 102, the second seat 121 being slidably connected to the first guide rail 101, and the first frame 200 being slidably connected to the second guide rail 102. The first guide rail 101 is located at a higher position to support the second seat 121 of the rotating structure 120; the second guide rail 102 is located at a lower position to support the first frame 200; the two are arranged parallel to each other but at different heights, forming a spatially layered layout that avoids interference between moving parts.

[0045] As a preferred embodiment, a second gear 126 is rotatably connected to the second base 121. The second gear 126 is driven by a sixth motor 127. A first rack 103 is provided on the inner sidewall of the base 100, and the second gear 126 meshes with the first rack 103. This structure enables the rotating structure 120 to be translated and adjusted along the drill pipe axis, allowing the rotating ring 122 to be precisely aligned with the clamping position of the drill bit, thus improving the overall operational flexibility.

[0046] As a preferred embodiment, a third gear 203 is rotatably connected to the first frame 200, and the third gear 203 is driven by a seventh motor 204. A second rack 104 is installed on the outer wall of the base 100, and the third gear 203 meshes with the second rack 104. This structure enables the independent movement of the first frame 200 (including the front disassembly assembly 210, the rear venting assembly 220, and the clamping mechanism 230) on the base 100, facilitating its switching between a "standby position" and a "working position." The movement is independent of the rotating structure 120, avoiding interference and improving the rationality of the equipment layout and the smoothness of the operation process.

[0047] In summary, this invention, through the collaborative design of its various mechanisms, solves key technical problems such as high-pressure gas accumulation, high risks associated with manual depressurization, and easy core ejection that exist after traditional coring tools are brought to the surface. The subsystems are logically clear and functionally complementary, jointly constructing a safe, efficient, and controllable coring tool depressurization platform suitable for high-risk operational scenarios such as geological exploration and oil and gas drilling.

[0048] The present invention has been described in detail above. The specific embodiments are provided only to help understand the method and core idea of ​​the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A pressure relief device for a core drilling tool, characterized in that: include A base (100) is provided with a conveying structure (110) for conveying drill rods; The first frame (200) is mounted on the base (100). The first frame (200) is provided with a front disassembly assembly (210) and a tail venting assembly (220). The first frame (200) is also provided with a clamping mechanism (230) for clamping the drill rod. The front disassembly assembly (210) includes a second frame (211) fixedly mounted on the first frame (200), a disassembly drill (214) slidably mounted on the second frame (211), and the disassembly drill (214) is locked on the second frame (211) by a first locking mechanism. The disassembly drill (214) is driven by a first motor (215). The tail venting assembly (220) includes a third frame (221) rotatably mounted on the first frame (200), the third frame (221) being driven by a drive assembly, and a valve block (227) being mounted on the third frame (221) by a valve release assembly; A rotating structure (120) is disposed on a base (100) for driving the drill rod to rotate.

2. The pressure relief device for a coring drill bit according to claim 1, characterized in that: The conveying structure (110) includes a worm gear screw jack (111) and a support frame (113). The worm gear screw jack (111) is driven by a second motor (112). The support frame (113) is located at the output end of the worm gear screw jack (111). A pair of auxiliary rotating wheels (114) are rotatably mounted on the support frame (113).

3. The pressure relief device for a coring drill according to claim 2, characterized in that: The clamping mechanism (230) includes a first plate (231) and two clamping blocks (233). A first cylinder (201) is provided on the first frame (200). The output end of the first cylinder (201) passes through the first frame (200) and is fixedly connected to the first plate (231). A bidirectional lead screw (232) is connected to the first plate (231). The two clamping blocks (233) are respectively threaded at both ends of the bidirectional lead screw (232), and the clamping blocks (233) are slidably connected to the bottom of the first plate (231). The bidirectional lead screw (232) is driven by a third motor (234).

4. The pressure relief device for a coring drill according to claim 3, characterized in that: The first plate (231) is provided with a plurality of rods (235), the top of the rods (235) is connected to the second plate (236), the rods (235) are inserted into the first frame (200), and a compression spring (202) is sleeved on the rods (235), the bottom of the compression spring (202) is fixedly connected to the top of the first frame (200).

5. The pressure relief device for a coring drill according to claim 1, characterized in that: The first locking mechanism includes a first lead screw (212) mounted on the second frame (211). The first lead screw (212) is driven by an eighth motor (216). A first seat (213) is threaded onto the first lead screw (212), and the first seat (213) is slidably connected to the second frame (211). The disassembly drill (214) and the first motor (215) are both mounted on the first seat (213).

6. The pressure relief device for a coring drill bit according to claim 1, characterized in that: The drive assembly includes a fourth motor (222) and a reducer (223) connected to its output end. The output end of the reducer (223) is provided with an output flange, which is fixedly connected to the third frame (221). The unloading valve assembly includes a second cylinder (224) installed on the third frame (221). The output end of the second cylinder (224) is connected to the fourth frame (225). The bottom of the fourth frame (225) is provided with a third cylinder (226). The unloading valve block (227) is driven by the third cylinder (226).

7. The pressure relief device for a coring drill bit according to claim 1, characterized in that: The rotating structure (120) includes a second seat (121), which is slidably disposed on the base (100). A rotating ring (122) is rotatably connected to the second seat (121). A gear ring (123) is provided on the outer periphery of the rotating ring (122). A first gear (124) matching the gear ring (123) is rotatably disposed on the second seat (121). The first gear (124) is driven by a fifth motor (125).

8. The pressure relief device for a coring drill according to claim 7, characterized in that: The base (100) is provided with a first guide rail (101) and a second guide rail (102), the first guide rail (101) is higher than the second guide rail (102), the second seat (121) is slidably connected to the first guide rail (101), and the first frame (200) is slidably connected to the second guide rail (102).

9. A pressure relief device for a coring drill according to claim 7 or 8, characterized in that: A second gear (126) is rotatably connected to the second base (121). The second gear (126) is driven by a sixth motor (127). A first rack (103) is provided on the inner side wall of the base (100). The second gear (126) meshes with the first rack (103).

10. The pressure relief device for any of the coring drill tools according to claims 1-8, characterized in that: A third gear (203) is rotatably connected to the first frame (200), and the third gear (203) is driven by a seventh motor (204). A second rack (104) is installed on the outer wall of the base (100), and the third gear (203) meshes with the second rack (104).

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