A geological drilling hole sealing device

Abstract

A geological drilling orifice sealing device includes a slip seat and a sealing seat installed up and down. The sealing seat is fixed to the wellhead, and the slip seat can rotate relative to the sealing seat. The slip seat is equipped with a slip moving mechanism, and the slip moving mechanism is provided with slips. The slips match and embrace the drill pipe, and the slips can move horizontally in a direction perpendicular to the drill pipe. The present invention uses multiple layers of movable slips to hold the drill pipe tightly under the action of spring force. During drilling, there is always a pair of slips to hold the drill pipe or the drill pipe joint tightly, thereby ensuring that the sealing effect does not fail with the change of the drill pipe diameter. The sealing device can be installed on the orifices of drilling rigs of different specifications. During use, the slips can be replaced according to the drill pipe diameter and drill pipe type, so as to achieve a reliable sealing effect. The use of the present invention can keep the orifice operating environment clean, facilitate the work of the orifice operator, avoid the direct discharge of rock powder and impurities in the hole from the orifice, and reduce pollution to the surrounding environment.

Description

Technical Field

[0001] The invention relates to a device used for geological exploration, in particular to a geological drilling hole sealing device. Background Art

[0002] At present, during the air drilling construction process, the annular gap between the drill pipe and the borehole is large. The rock powder generated during the drilling process will be blown directly into the atmosphere through the annular gap, or because of the large back pressure in the hole, the water and impurities in the hole will be sprayed out of the hole through the annular gap. Some of them will directly enter the atmosphere, and some will be directly sprayed on the drilling rig, causing pollution to the drilling rig, bringing inconvenience to the wellhead operators, reducing construction efficiency and increasing costs. The dust discharged into the atmosphere will directly cause serious pollution to the surrounding environment. The existing orifice sealing device is usually only applicable to drill pipes of the same diameter, and cannot be adjusted in time according to the change of drill pipe diameter, so its use is limited; when the diameter of the drill pipe changes, the gap between the seal and the drill pipe will become larger, resulting in sealing failure. Summary of the invention

[0003] The purpose of the present invention is to provide a geological drilling hole sealing device which has good sealing effect, the sealing effect is not affected by the change of drill pipe diameter and has a wide application range.

[0004] The problem described in the present invention is achieved by the following technical solution:

[0005] A geological drilling hole sealing device comprises a slip seat and a sealing seat installed up and down, the sealing seat is fixed at the wellhead, the slip seat can rotate relative to the sealing seat, a slip moving mechanism is mounted on the slip seat, the slip moving mechanism is provided with slips, the slips are matched and engaged with the drill pipe, and the slips can move horizontally in a direction perpendicular to the drill pipe;

[0006] A support frame is provided on the cava seat, and the cava moving mechanism is supported by the support frame. There are six sets of cava moving mechanisms in total, and the six sets of cava moving mechanisms are distributed in three layers of upper, middle and lower layers, with two sets symmetrically arranged on each layer. Each set of cava moving mechanism includes an adjusting screw, a spring and a cava. The adjusting screw is spirally matched with the end plate of the support frame. The cava is provided with an adjusting handle, and the spring is sleeved on the adjusting handle. The adjusting screw is provided with a center hole, and one end of the adjusting handle is inserted into the center hole of the adjusting screw. Both ends of the spring respectively touch the cava and the end of the adjusting screw.

[0007] The above-mentioned geological drilling hole sealing device, the slip is provided with a holding block, the holding block is a non-metallic wear-resistant material, the holding block is provided with a semicircular sealing opening, and the sealing openings of two symmetrically arranged holding blocks are matched to form a circular hole.

[0008] In the above-mentioned geological drilling hole sealing device, the sealing opening radius of the upper and lower blocks matches the radius of the drill pipe, and the sealing opening radius of the middle block matches the radius of the drill pipe joint.

[0009] In the above-mentioned geological drilling hole sealing device, the distance from the bottom surface of the upper block to the top surface of the lower block is not less than the height dimension of the drill pipe joint.

[0010] The above-mentioned geological drilling hole sealing device, the support frame is provided with a top plate, a bottom plate, a front plate, a rear plate, an end plate and a partition, the partition is located between the cava moving mechanisms of the upper and lower adjacent layers, the front and rear sides of each cava are provided with guide grooves, the positions of the front plate and the rear plate corresponding to the guide grooves are provided with guide screws, and the guide screws are located in the guide grooves.

[0011] In the geological drilling hole sealing device, the upper and lower sides of the slips are provided with anti-wear plates, and the anti-wear plates form sliding friction with the adjacent upper plate or lower plate or partition plate.

[0012] The above-mentioned geological drilling hole sealing device, the sealing seat is provided with a cylindrical support, a rotating sleeve is provided in the middle of the cylindrical support, the rotating sleeve is connected to the spacer, the rotating sleeve and the spacer support the cava seat, a bearing is provided between the rotating sleeve and the cylindrical support, and a slag discharge port is provided on the side wall of the cylindrical support.

[0013] The sealing device of the present invention adopts a movable slip to hold the drill pipe tightly under the action of spring force to achieve sealing. The force of tightening the drill pipe is determined by adjusting the degree of the screw compression spring. Multi-layer slips are designed according to the different sizes of the drill pipe and the drill pipe joint. During drilling, there is always a pair of slips to hold the drill pipe or the drill pipe joint tightly, thereby ensuring that the sealing effect does not fail with the change of the drill pipe diameter. The sealing device can be installed on the orifice of drilling rigs of different specifications. During use, the slips can be replaced according to the drill pipe diameter and drill pipe type, thereby achieving a reliable sealing effect. The use of the present invention can keep the orifice operating environment clean, facilitate the work of the orifice operator, reduce construction costs, speed up the construction cycle, avoid rock powder and impurities in the hole from being directly discharged from the orifice, and reduce pollution to the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below in conjunction with the accompanying drawings.

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 yes Figure 1 A top view of

[0017] Figure 3 yes Figure 1 AA section view;

[0018] Figure 4 yes Figure 1 BB cross-sectional view;

[0019] Figure 5 yes Figure 1 C-direction view;

[0020] Figure 6 yes Figure 1 A magnified partial view of point D in the middle.

[0021] The numbers in the figure are: 1. Cylindrical support; 2. Rotating sleeve; 3. Bearing; 4. Spacer; 5. Slip seat; 6. Adjusting screw; 7. Spring; 8. Adjusting handle; 9. Partition; 10. End plate; 11. Top plate; 12. Slip; 12-1. Holding block; 12-2. Guide groove; 12-3. Sealing port; 13. Wear plate; 14. Drill rod; 14-1. Drill rod joint; 15. Front plate; 16. Bottom plate; 17. Slag discharge port; 18. Rear plate; 19. Guide screw. DETAILED DESCRIPTION

[0022] See also Figure 1 , Figure 2 and Figure 5 The present invention includes a cava seat and a sealing seat installed up and down. The sealing seat is provided with a cylindrical support 1, and the cylindrical support is fixed at the wellhead of the air drilling construction. The side wall of the cylindrical support is provided with a slag discharge port 17. The sand and rock powder discharged by drilling is discharged through the slag discharge port, and the rock powder is collected by the operator. A rotating sleeve 2 is provided in the middle of the cylindrical support. In order to reduce the friction resistance during rotation, a bearing 3 is provided between the rotating sleeve and the cylindrical support, and the rotating sleeve can rotate freely relative to the cylindrical support. The rotating sleeve is connected to the spacer sleeve 4, and the spacer sleeve and the rotating sleeve support the cava seat 5. A support frame and a cava moving mechanism are provided on the cava seat. The support frame includes a top plate 11, a bottom plate 16, a front plate 15, a rear plate 18, and an end plate 10 respectively located at the upper, lower, front, rear, and outer ends of the support frame. The cava moving mechanism is supported by the support frame. A total of six sets of cava moving mechanisms are arranged, and the six sets of cava moving mechanisms are distributed according to the upper, middle, and lower three layers, and two sets are symmetrically arranged on each layer. The support frame is also provided with a partition 9, which is located between the slip moving mechanisms of the upper and lower adjacent layers. Each set of slip moving mechanisms includes an adjusting screw 6, a spring 7 and a slip 12. The adjusting screw is spirally matched with the end plate 10 of the support frame. The slip is provided with an adjusting handle 8, and the spring is sleeved on the adjusting handle. The adjusting screw is provided with a center hole, and one end of the adjusting handle is inserted into the center hole of the adjusting screw. The two ends of the spring contact the slip and the end of the adjusting screw respectively. By rotating the adjusting screw, the force of the spring on the slip can be adjusted, thereby adjusting the holding force of the holding block on the drill pipe.

[0023] See also Figure 1 , Figure 3 and Figure 4The cava is provided with a holding block 12-1, and the holding block is made of non-metallic wear-resistant materials, such as butadiene rubber, cloth-reinforced rubber, polytetrafluoroethylene, polyurethane and other wear-resistant materials. The holding block is provided with a semicircular sealing port 12-3, and the sealing ports of the two symmetrically arranged holding blocks are matched to form a circular hole that matches the cross-section of the drill pipe or the cross-section of the drill pipe joint. Among them, the sealing port radius of the holding block located in the upper layer and the holding block located in the lower layer matches the radius of the drill pipe 14, and the sealing port radius of the holding block located in the middle layer matches the radius of the drill pipe joint 14-1. In order to ensure that the cava has a sealing effect on both the drill pipe and the drill pipe joint, the distance from the bottom surface of the upper holding block to the top surface of the lower holding block is not less than the height dimension of the drill pipe joint. In the above structure, during the drilling process, at least one pair of cava maintains a sealed contact state with the drill pipe or the drill pipe joint, effectively preventing the rock powder and impurities in the wellbore from being directly discharged from the wellhead, and avoiding pollution to the surrounding environment. To ensure that the slips move smoothly, guide grooves 12-2 are provided on the front and rear sides of each slip, and guide screws 19 are provided at positions corresponding to the guide grooves on the front and rear plates. The guide screws are located in the guide grooves, thereby limiting the movement of the slip body.

[0024] See also Figure 1 , Figure 6 The upper and lower sides of each slip are provided with anti-wear plates 13, and the anti-wear plates and the adjacent upper plates or lower plates or partitions slide and rub to form a seal.

[0025] When the present invention is used, a slip that matches the drill pipe and the drill pipe joint is selected and assembled to the slip moving mechanism at the corresponding position. After the sealing device is installed at the wellhead, the drill pipe is inserted into the sealing port of the slip, and the upper and lower adjusting screws are rotated so that the upper and lower slips hold the drill pipe tightly; the drill pipe is moved up and down, and the middle adjusting screw is rotated so that the middle slips are tightly held. During the drilling process, each adjusting screw can be appropriately adjusted according to the sealing effect to ensure the sealing effect. During the drilling process, as the drill pipe rotates, the sealing seat drives the support frame and the slip moving mechanism to rotate. During the up and down movement of the drill pipe, the slip moves horizontally as the diameter of the drill pipe changes. The sealing device can always keep at least one pair of slips tightly engaged with the drill pipe or the drill pipe joint, so that rock powder and impurities cannot be directly sprayed out from the wellhead, greatly reducing the pollution to the wellhead working surface and the surrounding environment.

Claims

1. A geological drilling hole sealing device, characterized in that: It includes a slip seat and a sealing seat installed up and down. The sealing seat is fixed at the wellhead. The slip seat can rotate relative to the sealing seat. The slip seat is equipped with a slip moving mechanism. The slip moving mechanism is provided with slips. The slips are matched and engaged with the drill pipe. The slips can move horizontally in a direction perpendicular to the drill pipe. The slip seat is provided with a support frame, and the slip moving mechanism is supported by the support frame. There are six sets of slip moving mechanisms in total. The shoe moving mechanism is arranged in three layers, upper, middle and lower, with two sets symmetrically arranged on each layer. Each set of the shoe moving mechanism includes an adjusting screw (6), The spring (7) and the slips (12), the adjusting screw and the end plate (10) of the support frame are spirally matched, the slips are provided with an adjusting handle (8), the spring is sleeved on the adjusting handle, the adjusting screw is provided with a center hole, one end of the adjusting handle is inserted into the center hole of the adjusting screw, and the two ends of the spring contact the slips and the end of the adjusting screw respectively; By rotating the adjusting screw, the force of the spring acting on the slips can be adjusted, thereby adjusting the holding force of the holding block on the drill pipe; The slip is provided with a holding block (12-1), the holding block is made of non-metallic wear-resistant material, the holding block is provided with a semicircular sealing opening (12-3), and the sealing openings of two symmetrically arranged holding blocks are matched to form a circular hole; The sealing opening radius of the upper and lower holding blocks matches the radius of the drill pipe (14), and the sealing opening radius of the middle holding block matches the radius of the drill pipe joint (14-1); The distance from the bottom surface of the holding block located at the upper layer to the top surface of the holding block located at the lower layer is not less than the height dimension of the drill pipe joint.

2. The geological drilling hole sealing device according to claim 1, characterized in that: The support frame is provided with a top plate (11), a bottom plate (16), a front plate (15), a rear plate (18), an end plate (10) and a partition plate (9), wherein the partition plate is located between the cava moving mechanisms of the upper and lower adjacent layers, and guide grooves (12-2) are provided on the front and rear sides of each of the cava, and guide screws (19) are provided at positions corresponding to the guide grooves on the front and rear plates, and the guide screws are located in the guide grooves.

3. The geological drilling hole sealing device according to claim 2, characterized in that: The upper and lower sides of the slip are provided with anti-wear plates (13), and the anti-wear plates form sliding friction with the adjacent upper plates or lower plates or partition plates.

4. The geological drilling hole sealing device according to claim 3, characterized in that: The sealing seat is provided with a cylindrical support (1), a rotating sleeve (2) is provided in the middle of the cylindrical support, the rotating sleeve is connected to a spacer sleeve (4), the rotating sleeve and the spacer sleeve support a slip seat (5), a bearing (3) is provided between the rotating sleeve and the cylindrical support, and a slag discharge port (17) is provided on the side wall of the cylindrical support.

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