Marine bedrock coring sampler

Abstract

The present invention discloses a marine bedrock coring sampler, comprising an outer barrel and a coring drill bit, which sequentially form an outer barrel string, and an inner barrel string, which is arranged within the outer barrel string and comprises a fishing head, a fishing head seat, an upper water diversion joint, a suspension ring, an underwater diversion joint, a suspension bearing device, a coring inner barrel, and a necking sleeve. The outer barrel string further comprises a spring-loaded stopper connected to the upper end of the outer barrel, a spring-loaded chamber joint, and a suspension joint; the inner barrel string further comprises a spring-loaded device connected between the fishing head seat and the upper water diversion joint; and the outer barrel string and the inner barrel string are connected and matched by a load-bearing ring and a suspension ring. By using the tool of the present invention, continuous bedrock coring operations can be performed without casing on a marine drilling rig or floating platform without drilling.

Description

Technical Field

[0001] The invention relates to the technical field of drilling coring tools for petroleum geology, natural gas exploration and marine geological survey. The main function is to perform marine hard bedrock coring sampling, in particular to a marine bedrock coring sampler. Background Art

[0002] When conducting uncased bedrock coring on a ship-based drilling rig or floating drilling platform, conventional drilling coring tools are often affected by ocean swells and currents. This makes it difficult to re-enter the original wellbore when re-running the coring tool after continuous coring. Traditional rope coring tools, however, require the lower portion of the tool to extend beyond the drill bit, resulting in an inappropriate fit between the core and the coring barrel, making them unsuitable for coring in bedrock formations. Summary of the Invention

[0003] The purpose of the present invention is to provide a marine bedrock coring sampler suitable for use on ships under the influence of swells, in order to solve the problems existing in the prior art.

[0004] The technical solution of the present invention includes:

[0005] A marine bedrock coring sampler includes an outer cylinder and a coring drill bit, which are sequentially composed of an outer cylinder string, and an inner cylinder string arranged in the outer cylinder string and composed of a fishing head, a fishing head seat, an upper water-dividing joint, a suspension ring, an underwater diverting joint, a suspension bearing device, a coring inner cylinder, and a necking sleeve. The characteristic is that: the outer cylinder string also includes a spring-loaded stopper head connected to the upper end of the outer cylinder, a spring-loaded chamber joint and a suspension joint; the inner cylinder string also includes a spring-loaded device connected between the fishing head seat and the upper water-dividing joint; the outer cylinder string and the inner cylinder string are connected and matched by a load-bearing ring and a suspension ring.

[0006] The side of the ejection device has two extendable retractable ejection calipers, and the lower part of the ejection head has two extending blocks. The two ejection calipers are distributed between the two blocks, and the torque is transmitted by relying on the two side surfaces of the block and the two side surfaces of the ejection calipers. The gap between the upper end surface of the ejection caliper and the lower end surface of the ejection head is 4-5mm.

[0007] A length-adjusting rod and a locking nut are also provided between the submerged joint and the suspension bearing device.

[0008] The lower end surface of the load-bearing ring is hung on the inner end surface of the suspension joint.

[0009] The core drill bit is equipped with 3-8 lateral flow channels.

[0010] The axial distance between the lower end face of the neck sleeve and the core drill bit is 10-12mm.

[0011] The invention has the advantages that continuous bedrock coring operation without casing can be carried out on a ship-mounted drilling rig or a floating platform without starting the drill. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural schematic diagram of a marine bedrock coring sampler according to the present invention.

[0013] Figure 2 It is a schematic diagram of the structure and coordination of the spring-loaded stopper and the spring-loaded device of the present invention.

[0014] Figure 3 It is a cross-sectional view of the core drill bit of the present invention.

[0015] In the figure: 1. Spring-loaded stopper, 2. Spring-loaded chamber joint, 3. Load-bearing ring, 4. Suspension joint, 5. Outer cylinder, 6. Coring drill bit, 7. Fishing head, 8. Fishing head seat, 9. Spring-loaded device, 10. Water distribution joint, 11. Suspension ring, 12. Water distribution joint, 13. Locking nut, 14. Length adjustment rod, 15. Suspension bearing device, 16. Coring inner cylinder, 17. Clamp-type core claw, 18. Neck sleeve.

[0016] 1-1. Spring-clip stop head boss, 1-2. Spring-clip stop head lower end surface, 1-3. Spring-clip stop head boss side; 9-1. Spring-clip device spring caliper, 9-2. Spring caliper upper end surface, 9-3. Spring caliper side. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0018] Example 1

[0019] A marine bedrock coring sampler includes an outer cylinder 5 and a coring drill bit 6, which are sequentially composed of an outer cylinder string, and an inner cylinder string arranged in the outer cylinder string and composed of a fishing head 7, a fishing head seat 8, an upper water diversion joint 10, a suspension ring 11, an underwater diversion joint 12, a suspension bearing device 15, a coring inner cylinder 16, and a necking sleeve 18. The outer cylinder string also includes a spring-loaded stopper head 1, a spring-loaded chamber joint 2, and a suspension joint 4 connected to the upper end of the outer cylinder; the inner cylinder string also includes a spring-loaded device 9 connected between the fishing head seat 8 and the upper water diversion joint 10; the outer cylinder string and the inner cylinder string are connected and matched by a load-bearing ring 3 and a suspension ring 11.

[0020] The side of the ejection device 9 has two extendable and retractable ejection calipers 9-1, and the lower part of the ejection head 1 has two extendable blocks 1-1. The two ejection calipers 9-1 are distributed between the two blocks 1-1, and the torque is transmitted by relying on the two side surfaces 1-3 of the blocks 1-1 and the two side surfaces 9-3 of the ejection caliper 9-1. The gap between the upper end surface 9-2 of the ejection caliper 9-1 and the lower end surface 1-2 of the ejection head 1 is 4-5mm.

[0021] Furthermore, a length-adjusting rod 14 and a locking nut 13 are provided between the submerged joint 12 and the suspension bearing device 15 .

[0022] Furthermore, the lower end surface of the load-bearing ring 3 is hung on the inner end surface of the suspension joint 4.

[0023] Furthermore, the core drill bit 6 is provided with 3-8 lateral flow channels.

[0024] Furthermore, the axial distance between the lower end surface of the neck sleeve 18 and the core drill bit 6 is 10-12 mm.

[0025] Typical embodiments

[0026] Reference Figure 1 Schematic diagram of a marine bedrock coring sampler. The outer barrel string is formed by a snap-action stopper 1, snap-action chamber joint 2, suspension joint 4, outer barrel 5, and coring drill bit 6, which are sequentially threaded together. A bearing ring 3 is positioned within the inner cavity of the suspension joint 4, mating with the end face. The inner barrel string is formed by a fishing head 7, a fishing head base 8, a snap-action device 9, an upper water diversion joint 10, a suspension ring 11, a lower water diversion joint 12, a locking nut 13, a length adjustment rod 14, a suspension bearing device 15, a coring inner barrel 16, and a necking sleeve 18, which are sequentially threaded together. A clamp-type core claw 17, slightly smaller in diameter than the outer diameter of the core, is placed within the necking sleeve 18. Once assembled, the inner barrel string is suspended from the upper end face of the bearing ring 3 by the lower end face of the suspension ring 11.

[0027] The axial distance between the lower end surface of the necking sleeve 18 and the inner step surface of the core drill bit 6 is 10-12 mm. This distance needs to be adjusted by the lengthening rod 14 and finally locked by the locking nut 13.

[0028] Reference Figure 2 Schematic diagram of the structure and coordination of the spring-loaded stopper 1 and the spring-loaded mechanism 9. The spring-loaded mechanism 9 has two extendable, retractable spring-loaded calipers 9-1 on its sides, and two extended blocks 1-1 at its lower portion. The two spring-loaded calipers 9-1 are positioned between the two blocks 1-1, transmitting torque via the side faces 1-3 of the blocks 1-1 and the side faces 9-3 of the spring-loaded calipers 9-1. A clearance of 4-5 mm is maintained between the upper end face 9-2 of the spring-loaded caliper 9-1 and the lower end face of the spring-loaded stopper 1. After coring, the inner barrel assembly is retrieved using a salvage device. This clearance ensures that the spring-loaded calipers 9-1 of the spring-loaded mechanism 9 can be properly retrieved.

[0029] Reference Figure 3 Cross-section of the core drill bit. The core drill bit is designed with six lateral flow channels 6-1 to flush the drill blades, preventing mud balling and cooling the PDC discs, extending the service life of the drill bit. By diverting the flow through the channels, the erosion of the core entering the drill bit cavity can be effectively reduced, thereby improving the core recovery rate.

Claims

1. A marine bedrock coring sampler, comprising an outer cylinder (5) and a coring drill bit (6) which are sequentially formed into an outer cylinder string, and an inner cylinder string which is arranged in the outer cylinder string and is composed of a fishing head (7), a fishing head seat (8), a water distribution upper joint (10), a suspension ring (11), a water distribution lower joint (12), a suspension bearing device (15), a coring inner cylinder (16), and a necking sleeve (18), characterized in that: The outer tube string further comprises a spring-loaded stopper (1), a spring-loaded chamber joint (2) and a suspension joint (4) connected to the upper end of the outer tube; the inner tube string further comprises a spring-loaded device (9) connected between the scoop seat (8) and the water diversion upper joint (10); the outer tube string and the inner tube string are connected and matched via a load-bearing ring (3) and a suspension ring (11); a clamp-type core claw (17) is placed inside the necking sleeve (18), and its diameter is slightly smaller than the outer diameter of the core; the spring-loaded device ( 9) There are two extendable and retractable spring calipers (9-1) on the side, and two extendable blocks (1-1) are located below the spring stopper (1). The two spring calipers (9-1) are distributed between the two blocks (1-1), and torque is transmitted by relying on the two side surfaces (1-3) of the blocks (1-1) and the two side surfaces (9-3) of the spring caliper (9-1). The gap between the upper end surface (9-2) of the spring caliper (9-1) and the lower end surface (1-2) of the spring stopper (1) is 4-5 mm. A length adjustment rod (14) and a locking nut (13) are also provided between the submerged joint (12) and the suspension bearing device (15).

2. The marine bedrock coring sampler according to claim 1, characterized in that: The lower end surface of the load-bearing ring (3) is hung on the inner end surface of the suspension joint (4).

3. The marine bedrock coring sampler according to claim 2, characterized in that: The core drill bit (6) is provided with 3-8 lateral flow channels (6-1).

4. The marine bedrock coring sampler according to claim 3, characterized in that: The lower end face of the necking sleeve (18) is 10-12 mm away from the axial direction of the core drill bit (6).

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