Packer for sealing water gushing drill hole and mounting method thereof

Abstract

According to the packer for water gushing drill hole sealing and the installation method of the packer, an outer layer drill rod is connected with a main shaft of the packer through a safety connector, a gasket and a bottom support steel plate are arranged at the bottommost portion of the packer, the bottom support steel plate is fixedly connected with the main shaft, and the main shaft penetrates through the gasket, a rubber ball, a positioner, an anti-loosening nut and the middle of the safety connector to be connected with the bottom support steel plate. All the components are connected into a whole. The packer can be placed at a designated position through the outer-layer drill rod, and accurate hole sealing is facilitated; the sealing device can be firmly embedded with a hole wall and cannot be washed away by gushing water, and the subsequent hole sealing quality is ensured; the rubber balls of the packer have high elasticity, the steel gaskets are arranged between the rubber balls, the flattening effect is good after compression, and the plugging effect is remarkable; the packer is economical, easy to machine and install and high in hole sealing success rate.

Description

Technical Field

[0001] The invention is mainly used in the fields of drilling technology and hole sealing technology, and mainly relates to a packer for sealing a water-gushing borehole and an installation method thereof. Background Art

[0002] In the field of geological core drilling, hole sealing is one of the six major indicators for drilling quality assessment. At present, during domestic mineral exploration and drilling construction, fractured strata and high-pressure aquifers are often encountered, resulting in water gushing into the hole, making it impossible to effectively seal the hole after the hole is completed, which brings great safety hazards and management costs to subsequent mineral development. Currently, commonly used water plugging methods include wooden plugs and expansion rubber rods. This type of water plugging method has fatal defects. For example, when a wooden plug is used, the wooden plug becomes smaller after reaching the designated position due to friction with the hole wall, and the water plugging effect is not ideal. After the drill rod is removed, the wooden plug is directly flushed out by water; when a water-expandable rubber rod is used, the expansion effect is often poor, and the wooden plug is flushed out of the hole after the drill rod is removed, and the hole cannot be effectively sealed:

[0003] Therefore, this patent provides a sealer for sealing water-gushing boreholes and its installation method. After in-depth research on the advantages and disadvantages of traditional sealing methods, through the optimized design of safety joints, anti-loosening nuts, positioners, rubber balls, etc., it is assembled into a sealer that can be accurately positioned and will not loosen, with rapid and ideal sealing effect. The use of two sets of drill pipes can realize the two major functions of positioning and water blocking, which can save a lot of manpower, material resources and time, and effectively solve major engineering problems that technical personnel in this field urgently need to solve. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a packer for sealing a water-gushing drilling hole and an installation method thereof. The packer is for sealing a water-gushing drilling hole, and the outer drill rod is connected to the packer main shaft through a safety joint, there is a gasket under the safety joint, there is an anti-loosening nut under the gasket, there is an extrusion slider under the anti-loosening nut, there is a positioner under the extrusion slider, there is an extrusion slider under the positioner, there is a gasket under the extrusion slider, there is a rubber ball under the gasket, there are gaskets between the rubber balls, the bottom of the packer is a gasket and a bottom supporting steel plate, the bottom supporting steel plate is fixedly connected to the main shaft, the main shaft passes through the middle of the gasket, the rubber ball, the positioner, the anti-loosening nut, and the safety joint, and is connected to the bottom supporting steel plate, so that the various components are connected as a whole.

[0005] Specifically, the lower part of the main shaft of the packer is threaded, the middle part is square, and the top part is conical;

[0006] Specifically, the inner drill pipe of the packer rotates the main shaft of the packer through a special joint, and the lower part of the special joint is conical and the inner part is square;

[0007] Specifically, the packer locator is a circular short-circuit with slits at both ends and inlaid with hard alloy;

[0008] Specifically, the inner hollow of the packer safety joint has threads, and the outer threads are reversed, connected to the drill pipe joint, and are disengaged from each other after forward rotation;

[0009] Specifically, the packer extrusion slider is truncated cone-shaped, hollow and without threads, the diameter of the lower bottom surface of the truncated cone is slightly smaller than the diameter of the borehole of the packer placement section, and the diameter of the upper bottom surface is smaller than the inner diameter of the positioner;

[0010] Specifically, the packer rubber ball has two characteristics: high elasticity and hollowness, and the outer diameter is customized according to the diameter of the hole section to be isolated;

[0011] This method places the packer 5 to 10 meters above the bottom plate of the water-blocking layer through the outer drill pipe, and uses the inner drill pipe to tighten and compress the packer. As the packer is gradually compressed, the carbide on the locator is embedded into the hole wall to prevent the packer from moving up and down, thereby realizing the positioning function; the rubber ball on the packer is gradually flattened after being compressed, thereby sealing the annular space between the packer and the hole wall, thereby realizing the function of blocking water gushing.

[0012] Beneficial Effects

[0013] The present invention provides a packer for sealing a water-gushing borehole and an installation method thereof. Compared with the prior art, the present invention has the following advantages:

[0014] 1. The packer can be placed at the designated position through the outer drill pipe, which is conducive to accurate hole sealing;

[0015] 2. The packer can be firmly embedded in the hole wall and will not be washed away by the gushing water, thus ensuring the quality of subsequent sealing;

[0016] 3. The rubber ball of the packer has high elasticity, and there are steel gaskets between the rubber balls. After compression, it has good flattening effect and significant plugging effect;

[0017] 4. The packer is economical, easy to process and install, and has a high sealing success rate; BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Among them: 1-main shaft, divided into a tapered guide part, a square tightening part, and a circular threaded part; 2-safety joint; 3-gasket; 4-anti-loosening nut; 5-extrusion slider; 6-positioner; 7-rubber ball; 8-bottom support steel plate; 9-special joint; 10-outer drill pipe; 11-inner drill pipe; 12-waterproof layer; 13-placement position of the packer; 14-waterproof layer bottom plate; 15-water-generating layer. DETAILED DESCRIPTION

[0020] The following is a specific implementation method and Figure 1 Further explanation of the patent of this invention:

[0021] See Figure 1 The water gushing drilling packer of the present invention has an outer drill pipe 10 connected to the packer main shaft 1 through a safety joint 2, a gasket 3 is below the safety joint 2, an anti-loosening nut 4 is below the gasket 3, an extrusion slider 5 is below the anti-loosening nut 4, a positioner 6 is below the extrusion slider 5, a gasket 3 is below the extrusion slider 5, a rubber ball 7 is below the positioner 6, and gaskets 6 are between the rubber balls 7. The bottom of the packer is the gasket 3 and a bottom supporting steel plate 8, and the bottom supporting steel plate 8 is fixedly connected to the main shaft 1. The main shaft 1 passes through the gasket 3, the rubber ball 7, the positioner 6, the anti-loosening nut 4, and the middle of the safety joint 2, and is connected to the bottom supporting steel plate 8, so that the various components are connected as a whole.

[0022] Specifically, the lower part of the packer main shaft 1 is threaded, the middle part is square, and the top part is conical;

[0023] Specifically, the inner drill pipe 11 of the packer rotates the main shaft 1 of the packer through a special joint 9, and the lower part of the special joint 9 is conical and the inner part is square.

[0024] Specifically, the packer locator 6 is a circular short-circuit with slits at both ends and inlaid with hard alloy.

[0025] Specifically, the inner hollow of the packer safety joint 2 has threads, and the outer threads are reverse threaded, connected to the drill pipe joint, and are disengaged from each other after forward rotation.

[0026] Specifically, the packer extrusion slider 5 is truncated cone-shaped, hollow and without threads, the diameter of the lower bottom surface of the truncated cone is slightly smaller than the diameter of the borehole of the packer placement section, and the diameter of the upper bottom surface is smaller than the inner diameter of the positioner.

[0027] Specifically, the packer rubber ball 7 has two major characteristics: high elasticity and hollowness, and the outer diameter is customized according to the diameter of the hole section to be isolated.

[0028] See Figure 1 , the packer installation method is:

[0029] a. First, connect the outer drill pipe 10 to the safety joint 2 of the packer, and use the outer drill pipe 10 to lower the packer to 5 to 10 meters above the waterproof layer bottom plate 14;

[0030] b. After the packer reaches the borehole, the outer drill pipe 10 is clamped and fixed with a clamp to prevent it from sliding down;

[0031] c. Connect the inner drill pipe 11 (one diameter smaller than the outer drill pipe) to the special joint 9, lower it to the position close to the packer and then slowly lower it to ensure that the upper part of the packer main shaft 1 slowly enters the special joint;

[0032] d. Slowly rotate the inner drill rod 11 and lift it upwards, observe the water gushing in the hole and the load of the drilling rig. When the load of the drilling rig becomes large, stop rotating, observe the water gushing at the hole mouth, then slowly rotate and lift the inner drill rod 11, continue to observe the water gushing at the hole mouth, and repeat the test several times until there is no water gushing at the hole mouth.

[0033] e. After there is no water gushing out of the hole, remove the inner drill pipe 11 and reverse the outer drill pipe 10. The outer drill pipe 10 will be detached from the packer at the safety joint 2. The packer will stay in the original position. Observe the water gushing out of the hole. After there is no water gushing out, remove the outer drill pipe 10.

[0034] f. After taking out the outer drill pipe 10, enter the normal hole sealing procedure.

[0035] The method places the packer 5 to 10 meters above the bottom plate of the waterproof layer through the outer drill pipe, and uses the inner drill pipe 11 to tighten and compress the packer. As the packer is gradually compressed, the hard alloy on the positioner 6 is embedded in the hole wall to prevent the packer from moving up and down, thereby realizing the positioning function; the rubber ball 7 on the packer is gradually flattened after being compressed, thereby sealing the annular space between the packer and the hole wall, thereby realizing the function of blocking water gushing.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A packer for sealing a water-gushing borehole, characterized in that: The outer drill pipe (10) is connected to the main shaft (1) of the packer through a safety joint (2). A gasket (3) is disposed below the safety joint (2). An anti-loosening nut (4) is disposed below the gasket (3). An extrusion slider (5) is disposed below the anti-loosening nut (4). A positioner (6) is disposed below the extrusion slider (5). A gasket (3) is disposed below the extrusion slider (5). A rubber ball (7) is disposed below the gasket (3). The gasket (3) is disposed between the rubber balls (7). The bottom of the packer is provided with a gasket (3) and a bottom supporting steel plate (8). The bottom supporting steel plate (8) is fixedly connected to the main shaft (1). The main shaft passes through the middle of the gasket (3), the rubber ball (7), the positioner (6), the anti-loosening nut (4) and the safety joint (2), so as to connect the components into a whole.

2. A packer for sealing a water-gushing borehole according to claim 1, characterized in that: The lower part of the packer main shaft (1) is threaded, the upper part is square, and the top is cone.

3. A packer for sealing a water-gushing borehole according to claim 1, characterized in that: The inner drill pipe (11) rotates the packer main shaft 1 through a special joint (9), wherein the special joint (9) has a conical bottom and a square interior.

4. A packer for sealing a water-gushing borehole according to claim 1, characterized in that: The inner hollow of the safety joint (2) is provided with threads, and the outer threads are reverse threaded, and are connected with the drill pipe joint, and are separated from each other after being rotated in the forward direction.

5. A packer for sealing a water-gushing borehole according to claim 1, characterized in that: The positioner (6) is a circular short-circuit with slits at both ends and inlaid with hard alloy.

6. A packer for sealing a water-gushing borehole as claimed in claim 1, characterized in that: The rubber ball (7) has two major characteristics: high elasticity and being hollow, and the outer diameter is customized according to the diameter of the hole section to be sealed.

7. A packer for sealing a water-gushing borehole according to claim 1, characterized in that: The squeezing slider (5) is in the shape of a truncated cone, hollow and without threads, the diameter of the lower bottom surface of the truncated cone is slightly smaller than the diameter of the borehole of the packer placement section, and the diameter of the upper bottom surface is smaller than the inner diameter of the positioner (6).

8. The method for installing a packer for sealing a water-gushing borehole according to claim 1 is as follows: a. First, connect the outer drill pipe (10) to the safety joint (2) of the packer, and use the outer drill pipe (10) to lower the packer to a position 5 to 10 meters above the waterproof layer bottom plate (14); b. After the packer reaches the borehole, the outer drill pipe (10) is clamped and fixed with a clamp to prevent it from sliding down; c. The inner drill pipe (11) is one caliber smaller than the outer drill pipe and connected to the special joint (9). The inner drill pipe (11) is lowered to the position close to the packer and then slowly lowered to ensure that the upper part of the packer main shaft (1) slowly enters the special joint; d. Slowly rotate the inner drill rod (11) and lift it upwards, observe the water gushing in the hole and the load of the drilling rig. When the load of the drilling rig becomes large, stop rotating, observe the water gushing at the hole mouth, then slowly rotate and lift the inner drill rod (11), continue to observe the water gushing at the hole mouth, and repeat the test several times until there is no water gushing at the hole mouth. e. After no water gushing out of the hole, the inner drill pipe (11) is taken out, and the outer drill pipe (10) is reversed. The outer drill pipe (10) is separated from the packer at the safety joint (2). The packer remains in the original position. The water gushing out of the hole is observed. After no water gushing out, the outer drill pipe (10) is taken out; f. After taking out the outer drill rod (10), the normal hole sealing procedure is started.

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