A drill pipe gripper for wireline coring drilling

Abstract

The utility model discloses a kind of drill pipe grippers for wireline coring drilling, by traditional drill pipe gripper improvement, after the hoisting rope of drilling rig winch system can be used to connect gripper (hoisting lug is set on the both sides of gripper), hoist and lower gripper body and drill pipe, reach the static friction between drill pipe and drilling fluid, hole wall, make the drill pipe in hole in active safety state, avoid the risk of drill pipe in hole seizure. At the same time, the bottom of gripper body is provided with rolling bearing and bottom plate, the gripper body is supported using rolling bearing, the gripper body can be reciprocated by external force (hydraulic torque wrench, pipe wrench and other tools), and then drive drill pipe reciprocation to realize stress release, slow down the adhesion force between drill pipe in hole and hole wall, so that drill pipe in hole is in active safety state.

Description

Technical Field

[0001] This utility model belongs to the field of wireline coring drilling technology, and in particular relates to a drill rod holder for wireline coring drilling. Background Technology

[0002] Wireline coring is widely used in deep hole drilling. This technique eliminates the need for frequent drill bit retrieval during drilling; the core-laden inner tube can be raised to the surface using only a rope, significantly reducing auxiliary work time and greatly improving pure drilling efficiency. With wireline coring, the core experiences less disturbance and wear within the inner tube, preserving geological structure information intact and thus increasing core recovery rate and ensuring core quality. Furthermore, this technique reduces drill bit wear, enhances borehole stability, and lowers worker workload. Given these significant advantages, wireline coring has become the most commonly used drilling technique in complex geological formations and deep hole exploration projects.

[0003] However, during wireline coring drilling operations, when retrieving the inner tubing assembly or conducting in-situ borehole tests, the drill pipe must be completely detached from the drilling rig's power head. This requires a clamp at the borehole opening to hold the drill pipe in place, keeping it stationary within the borehole. However, deep-hole drilling environments are complex and variable, influenced by drilling fluid, formation lithology, borehole wall stability, and other factors. Prolonged stationary drilling can lead to adhesion between the outer wall of the drill pipe and the borehole wall, resulting in frequent borehole accidents such as stuck drill pipe and drill bit jamming, significantly increasing operational risks and economic costs. For example, in actual operations, when drilling a kilometer-deep borehole, the entire process from core retrieval to the next drilling cycle typically takes about 50 minutes; if in-situ tests (such as integrated logging) are conducted within the drill pipe in a deep hole, the required time often reaches 2-3 hours. During this period of stationary drill pipe placement, two types of borehole accidents are highly likely to occur. The first type is that rock cuttings and powder inside the hole will accumulate in the annular gap formed by the borehole and the drill pipe, causing the drill pipe to get stuck and triggering a stuck drill accident; the second type is that the borehole wall may narrow and stick to the outer wall of the drill pipe, significantly increasing the risk of a stuck drill accident.

[0004] Traditional drill rod holders in wireline coring processes only lock and hold the drill rod inside the hole. They cannot eliminate the adhesion stress of the drill rod by rotating or lifting it with external force during the resting period. Furthermore, the risk of drill bit seizing due to mud cake forming on the hole wall during drilling increases exponentially with the resting time. Once a seizing or stuck drill bit occurs, it can easily lead to serious consequences such as damage to the drill rod and drilling tools, and even the abandonment of the borehole. The main problem this invention addresses is to develop a novel drill rod holder that, during the holding process, allows the drill rod to rotate by rotating or lifting the holder with external force, thereby reducing the risk of drill bit seizing or sticking. Utility Model Content

[0005] (1) Technical problem to be solved: Provide a drill rod holder for wireline coring drilling to solve the problems of stuck drill accidents caused by the deposition of rock cuttings and rock powder in the hole and the annular gap between the drill rod and the drill rod due to the static placement of the drill rod during the internal pipe retrieval and in-situ test operations, as well as drill sticking accidents caused by the hole wall shrinkage and the adhesion of the drill rod to the outer wall.

[0006] (2) The technical solution adopted by this utility model is as follows: A drill rod holder for wireline coring drilling includes a holder body, with a rolling bearing and a base plate arranged sequentially at the bottom of the holder body, and a through hole in the middle of the base plate.

[0007] A further technical solution is that the rolling bearing is a thrust bearing, the bottom of the clamp body is fixed to the moving ring at the top of the thrust bearing, the top of the base plate is provided with a limiting groove that matches the stationary ring at the bottom of the thrust bearing, and the stationary ring at the bottom of the thrust bearing is located in the limiting groove.

[0008] A further technical solution involves fixing the outer ring of the rolling bearing to the base plate, detachably fixing the inner ring of the rolling bearing to the clamp body, providing force-applying devices on both sides of the base plate, each force-applying device including a support base, with a support shaft rotatably connected to the top of the support base, and a first connecting part on the side of the support shaft. The first connecting part is hinged to the cylinder body of the hydraulic cylinder via a first pin. The support base and the base plate are connected by an adjustment structure, which can adjust the position of the support base in the width direction of the base plate. Connecting components are provided on both sides of the clamp body, each connecting component including a top seat fixed to the clamp body, with a top shaft rotatably connected to the top seat, and a second connecting part at the end of the top shaft. The second connecting part is hinged to the piston rod of the corresponding hydraulic cylinder via a second pin.

[0009] A further technical solution is that the adjustment structure is provided with a slide rail on the base plate, a slide groove matching the slide rail is provided at the bottom of the support base, the support base is slidably connected to the slide rail, and a locking element that can lock its position is provided on the support base.

[0010] A further technical solution is that the base plate is provided with two or more slide rods, and the clamp body is provided with slide holes at positions corresponding to the slide rods, the slide rods pass through the slide holes, and the slide rods are threadedly connected to the base plate.

[0011] A further technical solution is that the rolling bearing is a slewing bearing, an angular contact ball bearing, or a deep groove ball bearing.

[0012] (3) Due to the adoption of the above technical solution, the beneficial effects of this utility model are: By improving traditional drill pipe holders, the holder (with lifting lugs on both sides) can be connected to the hoisting rope of the drilling rig winch system to lift and lower the holder body and drill pipe. This breaks the static friction between the drill pipe and the drilling fluid / hole wall, keeping the drill pipe in a safe, movable state and avoiding the risk of drill pipe seizure. Furthermore, by installing rolling bearings and a base plate at the bottom of the holder body, the holder body can be supported by the rolling bearings. External force (such as a hydraulic torque wrench or pipe wrench) can be used to reciprocate the holder body, thereby driving the drill pipe to reciprocate and release stress, reducing the adhesion between the drill pipe and the hole wall, and keeping the drill pipe in a safe, movable state. Either method can be chosen.

[0013] Drill rod lifting and lowering can also be accomplished using a force-applying device without the need for the drilling rig winch system. Specifically, the support base of the force-applying device is fixed in the middle of the base plate. The hydraulic cylinder is activated to raise or lower the clamping body for lifting and lowering operations. During this process, the inner ring of the rolling bearing is in a separable state after disassembly. The force-applying device can also drive the drill rod to reciprocate. Specifically, the support base of the force-applying device is fixed near the edge of the base plate. The hydraulic cylinder is activated to drive the clamping body to reciprocate, thus causing the drill rod to reciprocate. During this process, the inner ring of the rolling bearing is connected and fixed to the clamping body. Using a hydraulic cylinder for driving is more labor-saving than using tools. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure corresponding to Embodiment 1 of this utility model; Figure 2 yes Figure 1 A schematic diagram of the bottom structure in the shown state; Figure 3 This is a cross-sectional schematic diagram of the structure corresponding to Embodiment 1 of this utility model; Figure 4 This is a schematic diagram of the overall structure corresponding to Embodiment 2 of this utility model; Figure 5 This is a cross-sectional schematic diagram of the structure corresponding to Embodiment 2 of this utility model; Figure 6 This is a schematic diagram of the state in Embodiment 2 of this utility model, in which the gripper body is driven to rotate by a hydraulic cylinder. Figure 7 This is a schematic diagram of the structure of the rolling bearing in Embodiment 2 of this utility model. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0016] like Figures 1-7 As shown.

[0017] Example 1: A drill pipe holder for wireline coring drilling includes a holder body 1. A rolling bearing 2 and a base plate 3 are sequentially arranged at the bottom of the holder body 1, with a through hole 4 in the center of the base plate 3. The holder body 1 has a symmetrically arranged wedge-shaped internal cavity with guide grooves on its inner wall. The holder body 1 contains a slip assembly comprising two symmetrically arranged wedge-shaped slips. These slips slide against the holder body 1 via the guide grooves, and an operating handle is provided on the upper surface of each slip. The drill pipe is positioned between the two slips and passes through the rolling bearing 2 and the through hole 4 in the center of the base plate 3. The base plate 3 is positioned directly above the wellhead. The holder body 1 used in this invention is a prior art solution. This solution does not improve the structure of the holder body 1 but rather adds supporting components to the existing holder body 1 to achieve the desired result.

[0018] The rolling bearing 2 is a thrust bearing 5. The bottom of the clamp body 1 is welded and fixed to the moving ring 6 at the top of the thrust bearing 5. The bottom plate 3 is provided with a limiting groove that matches the bottom stationary ring of the thrust bearing 5. The lower stationary ring of the thrust bearing 5 is located in the limiting groove, which is surrounded by multiple limiting posts 7.

[0019] In this embodiment, the clamp (with lifting lugs on both sides) can be connected to the hoisting rope of the drilling rig winch system to lift and lower the clamp body 1 and the drill pipe. This breaks the static friction between the drill pipe and the drilling fluid and borehole wall, allowing the drill pipe to move safely within the borehole and avoiding the risk of the drill pipe seizing up. Alternatively, external force (hydraulic torque wrench, pipe wrench, etc.) can be used to reciprocate the clamp body 1, thereby driving the drill pipe to reciprocate and release stress, reducing the adhesion between the drill pipe and the borehole wall, and allowing the drill pipe to move safely within the borehole. Either method can be chosen.

[0020] The thrust bearing 5 has an inner diameter greater than 125mm (allowing for free penetration of PQ, HTW, and NTW series drill pipes). The slip assembly includes slips of various sizes, with inner diameters compatible with the most common PQ, HTW, and NTW series drill pipe diameters on the market.

[0021] Lifting rings are provided on both sides of the clamp body 1. These are used to connect the hoisting rope of the drilling rig winch system.

[0022] During lifting and lowering operations, the gripper body 1 and the base plate 3 are connected and fixed by connecting bolts. When rotating the gripper body 1, the bolts need to be removed.

[0023] Example 2: The difference from Example 1 is that the rolling bearing 2 is a slewing bearing, angular contact ball bearing, or deep groove ball bearing. The outer ring 8 of the rolling bearing 2 is fixed to the base plate 3. The fixing method can be welding or welding a first flange 22 to the bottom of the outer ring 8. The first flange 22 is bolted to the base plate 3. The inner ring 9 of the rolling bearing 2 is detachably fixed to the clamp body 1. A second flange 23 can be welded to the top of the inner ring 9. The second flange 23 is bolted to the bottom of the clamp body 1. Force-applying devices are provided on both sides of the base plate 3. The force-applying devices include a support base 10. The support base 10 is topped with... A rotatable support shaft 11 is connected to the hydraulic cylinder 13. A first connecting part 12 is provided on the side of the support shaft 11. The first connecting part 12 is hinged to the cylinder body of the hydraulic cylinder 13 via a first pin. The support base 10 is connected to the base plate 3 via an adjustment structure. The adjustment structure can adjust the position of the support base 10 in the width direction of the base plate 3. Connecting components are provided on both sides of the clamping body 1. The connecting components include a top seat 14 fixed to the clamping body 1. A top shaft 15 is rotatably connected to the top seat 14. A second connecting part 16 is provided at the end of the top shaft 15. The second connecting part 16 is hinged to the piston rod of the corresponding hydraulic cylinder 13 via a second pin. Angular contact ball bearings or deep groove ball bearings can be used in double-row or four-row configurations to achieve better axial support. The top seat 14 and the top shaft 15 can be connected by a bushing. In this embodiment, the drill rod can also be lifted and lowered using a force-applying device without the need for the drilling rig winch system. Specifically, the support base 10 in the force-applying device is fixed in the middle of the base plate 3. The hydraulic cylinder 13 is activated to push the clamping body 1 to rise or fall, performing the lifting and lowering operation. During this process, the inner ring 9 of the rolling bearing 2 is in a separable state after disassembly (the connecting bolts between the second flange 23 and the clamping body 1 are removed). The drill rod can also be driven to reciprocate through the force-applying device. Specifically, the support base 10 in the force-applying device is fixed near the edge of the base plate 3. The hydraulic cylinder 13 is activated to push the clamping body 1 to reciprocate, thereby causing the drill rod to reciprocate. During this process, the inner ring 9 of the rolling bearing 2 is in a fixed connected state with the clamping body 1.

[0024] The adjustment structure can be multiple bolt holes opened along the width direction on the base plate 3. The support base 10 is connected to the base plate 3 by bolts. When it is necessary to adjust the position of the support base 10, remove the bolts connecting the support base 10 and the base plate 3. After adjusting the position of the support base 10, it can be fixed with bolts again.

[0025] In this embodiment, when the hydraulic cylinder 13 drives the gripper body 1 to rotate, since the hydraulic cylinder 13 is located on the same side of the base plate 3 and the gripper body 1, the hydraulic cylinder 13 will push the gripper to rise while driving the gripper to rotate. Therefore, the rolling bearing 2 adopts a slewing bearing, angular contact ball bearing or deep groove ball bearing. These bearings can withstand axial force, so that the gripper body 1 can only rotate and cannot rise at this time.

[0026] The hydraulic cylinders 13 corresponding to the force-applying devices on both sides of the clamp body 1 are arranged in an axisymmetric manner. One hydraulic cylinder 13 drives the clamp body 1 to rotate clockwise by a certain angle, and the other hydraulic cylinder 13 drives the clamp body 1 to rotate counterclockwise by the corresponding angle. When the piston rod of one hydraulic cylinder 13 extends, the piston rod of the other hydraulic cylinder 13 should retract. Of course, the hydraulic cylinders 13 corresponding to the force-applying devices on both sides of the clamp body 1 can also be arranged in a centrally symmetrical manner. The piston rods of both hydraulic cylinders 13 extend simultaneously to drive the clamp body 1 to rotate by a certain angle, and the piston rods retract simultaneously, realizing the reciprocating rotation of the clamp and the drill pipe. In this case, the hydraulic cylinders 13 are double-acting hydraulic cylinders 13.

[0027] To accommodate the installation space of the hydraulic cylinder 13 with a larger stroke, a cylindrical platform 24 with a central hole can be provided in the middle of the base plate 3 to support the rolling bearing 2.

[0028] In this embodiment, the rolling bearing 2 is preferably a bearing similar to SKF BEAS020052-2Z.

[0029] Example 3: Unlike Example 2, the adjustment structure features a slide rail 17 on the base plate 3 and a groove 18 at the bottom of the support base 10 that matches the slide rail 17. The support base 10 is slidably connected to the slide rail 17, and a locking element 19 is provided on the support base 10 to lock its position. The locking element 19 can be a pin, with pin holes made on the support base 10, the base plate 3, or the track. Inserting the pin into the pin hole achieves locking. Compared to Example 2, this adjustment structure facilitates moving the position of the support base 10.

[0030] Example 4: Based on Example 2, the base plate 3 is provided with two or more sliding rods 20. The clamping body 1 has sliding holes 21 at positions corresponding to the sliding rods 20, with the sliding rods 20 passing through the sliding holes 21. The sliding rods 20 are threadedly connected to the base plate 3. When in use, the sliding rods 20 are limited to the lifting and lowering of the clamping body 1 driven by the hydraulic cylinder 13 for lifting and lowering operations. This ensures more stable lifting and lowering of the clamping body 1. In Example 2, since the drill pipe is located inside the well, the clamp can only move up and down, enabling lifting and lowering operations, but the stability is not as good as in Example 4.

[0031] The above are merely preferred embodiments of this utility model.

Claims

1. A drill pipe holder for wireline coring drilling, comprising a holder body (1), characterized in that, The bottom of the clamp body (1) is provided with a rolling bearing (2) and a base plate (3). A through hole (4) is opened in the middle of the base plate (3). The outer ring (8) of the rolling bearing (2) is fixed to the base plate (3), and the inner ring (9) of the rolling bearing (2) is detachably fixed to the clamp body (1). Force-applying devices are provided on both sides of the base plate (3). The force-applying devices include a support base (10). The top of the support base (10) is rotatably connected to a support shaft (11). A first connecting part (12) is provided on the side of the support shaft (11). The first connecting part (12) is hinged by a first pin. The cylinder body of the hydraulic cylinder (13) is connected. The support base (10) and the base plate (3) are connected by an adjustment structure. The adjustment structure can adjust the position of the support base (10) in the width direction of the base plate (3). The clamp body (1) is provided with connecting components on both sides. The connecting components include a top seat (14) fixed to the clamp body (1). A top shaft (15) is rotatably connected to the top seat (14). A second connecting part (16) is provided at the end of the top shaft (15). The second connecting part (16) is hinged to the piston rod of the corresponding hydraulic cylinder (13) through a second pin.

2. A drill rod holder for wireline coring drilling according to claim 1, characterized in that, The adjustment structure is provided with a slide rail (17) on the base plate (3), and a slide groove (18) matching the slide rail (17) is provided at the bottom of the support base (10). The support base (10) is slidably connected to the slide rail (17), and a locking element (19) that can lock its position is provided on the support base (10).

3. A drill rod holder for wireline coring drilling according to claim 1, characterized in that, The base plate (3) is provided with two or more slide rods (20), and the clamp body (1) is provided with a sliding hole (21) at a position corresponding to the slide rod (20). The slide rod (20) passes through the sliding hole (21) and is threadedly connected to the base plate (3).

4. A drill rod holder for wireline coring drilling according to claim 1, characterized in that, The rolling bearing (2) is a slewing bearing, an angular contact ball bearing, or a deep groove ball bearing.

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