CN111810084A - Coal seam mesh gas drainage drilling construction method for water jet drilling rig - Google Patents

Abstract

The invention relates to a coal seam reticulated gas extraction drilling construction method using a water jet drilling rig, which includes drilling a number of water jet drilling holes in the coal seam. It is characterized by: using a water jet drilling rig with a 360° azimuth mark plate, mainly Rotate the outer drill rod so that the direction mark position of the water jet nozzle is aligned with the angle of the dial corresponding to the water jet construction drilling hole and another position adjacent to the water jet construction drilling hole, and start a water jet drilling rig to drill the inner drill pipe L _drilling distance, form water jet construction drilling to another water jet drilling in the direction of adjacent water jet construction drilling, repeat all water jet construction drilling to all water jet drilling in the direction of adjacent water jet construction drilling . Gas drainage boreholes can be directionally constructed in a network-like manner as needed, which expands the gas drainage range of the drainage boreholes and increases the pressure relief area. It is especially suitable for gas drainage of low-permeability hard coal seams, such as anthracite coal seam gas drainage. mining, effectively increasing the gas drainage effect of this coal seam.

Description

Coal seam mesh gas drainage drilling construction method for water jet drilling rig

technical field

The invention relates to a water jet drilling rig and a water jet drilling construction method, in particular to a coal seam mesh gas drainage drilling construction method of the water jet drilling rig.

Background technique

Improving the effect of gas drainage in low-permeability coal seams has always been an important direction and topic in the field of coal mine safety. The traditional underground hydraulic punching, hydraulic burrowing, and hydraulic loosening are affected by submerged jets, and the scope of pressure relief is not large. , the effect does not meet the requirements, and the effect of hydraulic fracturing is not ideal because it cannot form effective fracturing and improve the permeability of coal seams. The ultra-short radius radial rotation technology of underground drilling in coal mines can drill gas circulation channels (drilling holes) with a length of 20-50 meters in the coal seam that the drilling passes through, and expand the control range and pressure relief area of the drilling holes. , improve the permeability coefficient of the coal seam, and effectively increase the gas drainage effect of the coal seam.

For the regional outburst prevention measures for gas drainage by drilling through layers, due to various reasons such as low coal seam permeability, in order to meet the requirements of "coal mine gas drainage indicators", the spacing of drilling holes in some mining areas has been reduced to a grid of 5 × 5 meters. Grid, the amount of drilling works is large.

In order to effectively solve this problem, a water jet drilling method that can be drilled with turning drilling is adopted, which uses through-layer drilling, turns drilling at the coal-seeing point, and conducts water-jet drilling in the coal seam between the through-layer drilling holes. A method of forming a network of interconnected boreholes in the coal seam to effectively increase the gas permeability coefficient of the coal seam and improve the effect of gas drainage. However, at present, there is a lack of correspondingly oriented water jet drilling rigs, and the construction method of coal seam mesh gas drainage drilling cannot be realized.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a coal seam mesh gas drainage drilling construction method of a water jet drilling rig, which overcomes the defects of the prior art, expands the gas drainage range of the drainage drilling, and increases the pressure relief area.

For the implementation of the present invention, referring to Fig. 1, Fig. 5 and Fig. 6, a water jet drilling rig is first introduced, including a drilling rig main body 1 mechanically connected to an inner drill pipe holder 2 of the drilling rig and an outer drill pipe holder 3 of the drilling rig. There is a 360° azimuth marking plate 5 on the side of the outer drill pipe holder 3 of the drilling rig, a water jet nozzle direction marking 6 on the outside of the end of each outer drill pipe 4, and a flexible drill pipe rotator fixed at the front end of the outer drill pipe 4 7. The outer high pressure hose 8 is connected to the flexible high pressure hose 11 through the inner drill pipe 10 connected by the water braid 9. The front end of the flexible high pressure hose 11 is connected to the water jet nozzle 12 after the flexible drill pipe rotator 7 section.

Wherein: the flexible drill pipe rotator 7 is provided with several collars 71 .

Among them: the 360° azimuth marking plate 5 is fixed on the outer drill pipe holder 3 of the drilling rig through the fixing hole 407, and the 360 ° azimuth marking plate 5 is provided on the base 401 with a dial 405 with an adjusting angle handle 404. The upper part of 405 is provided with a half-side gland 402 to form a cavity 408 for adjusting the angle. The 360° azimuth marking plate 5 is provided with a drill pipe hole 406 in the middle, and a fastening screw 403 is provided from the outside of the base 401. The 360° azimuth marking plate 5 0°-360° scale is marked on the dial 405, and a water drop level 409 is provided.

Wherein: the 360° azimuth marking plate 5 can also be fixed on the main body 1 of the drilling rig.

The technical scheme adopted by the present invention to solve the technical problem is as follows: a coal seam mesh gas drainage drilling construction method for a water jet drilling rig, which includes drilling a number of water jet construction holes in the coal seam, and is characterized by: 1. using a water jet drilling rig Jet drilling rig, insert the outer drill pipe with flexible drill pipe rotator into the bottom of the water jet construction drilling hole of the coal seam, fix the outer drill pipe on the main body of the drilling rig with the outer drill pipe holder of the drilling rig, and use the inner drill pipe clamp of the drilling rig to fix the outer drill pipe on the main body of the drilling rig The inner drill pipe is fixed on the main body of the drilling rig by the holder, so that the water jet nozzle is inserted into the flexible drill pipe rotator. ②Using the 360° azimuth marking plate fixed on the outer drill pipe holder of the drilling rig, push and pull the adjustment handle to make the water drop The spirit level is in the horizontal state. After tightening the screw to fix the dial, turn the outer drill rod to make the water jet nozzle direction marking position align with the position of the water jet construction drilling hole corresponding to the angle of the dial, which is adjacent to the water jet construction drilling hole. , start a water jet drilling rig, make the inner drill pipe drill L _drilling distance, form a water jet drilling hole to a water jet drilling hole adjacent to the direction of the water jet construction drilling hole, withdraw the inner drill pipe, make the water jet nozzle To the flexible drill pipe rotator, ③Use the 360° azimuth marking plate fixed on the drill pipe holder outside the drilling rig, push and pull the angle adjustment handle to make the water drop level in a horizontal state, tighten the tightening screw to fix the dial, and turn it. For the outer drill pipe, align the water jet nozzle direction marking position with the position of the water jet construction hole corresponding to the angle of the dial and adjacent to the water jet construction hole, start a water jet drilling rig, and make the inner drill pipe drill into L _Drilling distance, form the water jet construction hole to another water jet hole adjacent to the direction of the water jet construction hole, withdraw the inner drill pipe, make the water jet nozzle into the flexible drill pipe rotator, repeat the construction process ③, complete One water jet drilling hole is constructed to all the water jet drilling holes adjacent to the direction of the water jet construction drilling hole, withdraw the inner drill pipe, make the water jet nozzle into the flexible drill pipe rotator, and pull out the inner drill pipe and the outer drill pipe H Meter distance, repeat the construction process of ② and ③, and complete one water jet construction hole to all water jet holes in the direction of all adjacent water jet construction holes.

Among them: repeat the construction process of ①, ②, and ③, and complete all water jet drilling holes to all water jet drilling holes in the direction of all adjacent water jet construction drilling holes.

Among them: 3L/5≥L _drill≥L /2, 50m≥L≥30m, H is an integer multiple of the effective length of each outer drill pipe, 10m≥H≥4m.

Among them, the direction and depth of the water jet drilling holes for the water jet construction drilling holes are determined according to the horizontal angle, inclination angle and depth of the water jet construction drilling holes that have been formed, and the required mesh-like through-hole gas drainage holes are formed during the construction.

Among them: the number of water jet reticulated water jet construction holes is determined according to needs, and ψ is the angle between adjacent water jet holes.

Corresponding methods derived from the above construction method of the coal seam mesh gas drainage drilling construction method of the water jet drilling rig are also within the scope of protection.

The beneficial effects of the present invention are as follows: the present invention uses a water jet drilling rig to realize the construction of coal seam mesh gas drainage drilling holes from water jet construction drilling holes, and can directionally construct meshed through gas drainage drilling holes as required, thereby expanding the scope of the invention. The gas extraction range of the drilling hole increases the pressure relief area, and is especially suitable for gas extraction in low-permeability hard coal seams, such as gas extraction in anthracite coal seams, effectively increasing the gas drainage effect of this coal seam.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Figure 1. A schematic diagram of the structure of a water jet drilling rig;

2 is a schematic diagram of the arrangement of the coal seam mesh gas drainage drilling holes of a water jet drilling rig according to the first embodiment of the present invention;

Figure 3. A-A cross-sectional schematic diagram in Figure 2;

4 is a schematic diagram of the arrangement of the coal seam mesh gas drainage drilling holes of a water jet drilling rig according to the second embodiment of the present invention;

Figure 5. Schematic diagram of the structure of the 360° azimuth marking plate;

Figure 6. A schematic diagram of the cross-sectional structure of Figure 5 A-A.

In the picture: 1. The main body of the drilling rig, 2. The drill pipe holder inside the drilling rig, 3. The outer drill pipe holder of the drilling rig, 4. The outer drill pipe, the 5.360° azimuth marking plate, 6. The direction marking of the water jet nozzle, 7. Flexible drill pipe rotator, 8. External high pressure hose, 9. Water braid, 10. Inner drill pipe, 11. Flexible high pressure hose, 12. Water jet nozzle, 21. Water jet drilling, 22. Water jet construction drilling, 71. Collar, 100. Seam, 401. Base, 402. Half-side gland, 403. Fastening screw, 404. Adjusting angle handle, 405. Dial, 406. Drill hole, 407. Fixing hole, 408 . Cavity for adjusting the angle, 409. Water drop level. .

Detailed ways

first embodiment

Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 5, Fig. 6, a coal seam mesh gas drainage drilling construction method for a water jet drilling rig includes drilling a number of (diameter greater than 150 mm) water jet construction drills in the coal seam 100 The hole 22 is characterized as follows: ①Using a water jet drilling rig, insert the outer drill pipe 4 with the flexible drill pipe rotator 7 into the bottom of the water jet construction hole 22 of the coal seam 100, and use the outer drill pipe holder 3 of the drilling rig. Fix the outer drill rod 4 on the main body 1 of the drilling rig, use the inner drill rod holder 2 to fix the inner drill rod 10 on the main body 1 of the drilling rig, make the water jet nozzle 12 go into the flexible drill rod rotator 7, and ② fix it with On the 360° azimuth marking plate 5 on the outer drill pipe holder 3 of the drilling rig, push and pull the adjusting angle handle 404 to make the water drop level 409 in a horizontal state, and after tightening the tightening screw 403 to fix the dial, rotate the outer drill pipe 4 to make The position of the water jet nozzle direction mark 6 is aligned with a position of the water jet construction hole 20 adjacent to the water jet construction hole 21 corresponding to the angle of the dial 405, and a water jet drilling rig is started, so that the inner drill pipe 10 is drilled into the L _drill . = 21 meters, L = 40 meters distance, form a water jet drilling hole 22 to a water jet drilling hole 21 adjacent to the direction of the water jet construction drilling hole, withdraw the inner drill pipe 10, and rotate the water jet nozzle 12 to the flexible drill pipe 3. Use the 360° azimuth marking plate 5 fixed on the outer drill pipe holder 3 of the drilling rig, push and pull the adjustment angle handle 404, so that the water drop level 409 is in a horizontal state, and after tightening the tightening screw 403 to fix the dial, Rotate the outer drill rod 4 to align the water jet nozzle direction mark 6 with another position adjacent to the water jet construction hole 21 of the water jet construction hole 20 corresponding to the angle of the dial 405, and start a water jet drilling rig to make The inner drill pipe 10 is drilled into L _drill = 21, L = 40 meters, and the water jet construction hole 22 is formed to another water jet hole 21 adjacent to the water jet construction hole direction, and the inner drill pipe 10 is withdrawn, so that the water The jet nozzle 12 is placed in the flexible drill pipe rotator 7, and the construction process 3 is repeated to complete the construction of one water jet construction drilling hole 22 to all the water jet drilling holes 21 adjacent to the water jet construction drilling direction, and the inner drill pipe 10 is withdrawn to make the construction. The water jet nozzle 12 is inserted into the flexible drill pipe rotator 7, and the inner drill pipe 10 and the outer drill pipe 4 are pulled out by a distance of H=4 (generally H=4-10 meters) meters, and the construction process of ② and ③ is repeated to complete a water jet Construction boreholes 22 to all waterjet boreholes 21 adjacent to the direction of the waterjet construction boreholes.

Among them: repeat the construction process of ①, ②, and ③, and complete all the water jet drilling holes 22 to all the water jet drilling holes 21 adjacent to the direction of the water jet construction drilling holes.

Among them: 3L/5≥L _drill≥L /2, 50m≥L≥30m, H is an integer multiple of the effective length of each outer drill pipe 4, 10m≥H≥4m.

Wherein: the number of the water jet reticulated water jet construction holes 22 is determined as required, ψ is the angle between adjacent water jet bore holes, and ψ=60°.

Wherein: the direction and depth position of the water jet drilling hole 21 of the water jet construction drilling hole 22 are determined according to the horizontal angle, inclination angle and depth of the water jet construction drilling hole 22 that have been formed, and the required mesh-like gas drainage is formed by the construction. drilling.

Second Embodiment

Referring to Fig. 1, Fig. 4, Fig. 5, Fig. 6, a coal seam mesh gas drainage drilling construction method of a water jet drilling rig includes drilling a number of (diameter greater than 150 mm) water jet construction holes 22 in the coal seam 100, The characteristics are: ①Using a water jet drilling rig, insert the outer drill pipe 4 with the flexible drill pipe rotator 7 into the bottom of the water jet construction hole 22 of the coal seam 100, and use the outer drill pipe holder 3 of the drilling rig to drill the outer drill pipe. The rod 4 is fixed on the main body 1 of the drilling rig, and the inner drill rod 10 is fixed on the main body 1 of the drilling rig with the drill rod holder 2 in the drilling rig, so that the water jet nozzle 12 is inserted into the flexible drill rod rotator 7, and ② it is fixed outside the drilling rig On the 360° azimuth marking plate 5 on the drill pipe holder 3, push and pull the adjusting angle handle 404 to make the water droplet level 409 in a horizontal state. After tightening the tightening screw 403 to fix the dial, turn the outer drill pipe 4 to make the water jet nozzle The position of the direction mark 6 is aligned with a position of the water jet construction hole 21 adjacent to the water jet construction hole 21 corresponding to the angle of the dial 405, and a water jet drilling rig is started, so that the inner drill pipe 10 is drilled into the L _drill = 21 meters , L ₂ = 40 meters, L ₁ = 30 meters distance, form a water jet drilling hole 22 to a water jet drilling hole 21 adjacent to the direction of the water jet construction drilling hole, withdraw the inner drill pipe 10, make the water jet nozzle 12 to In the flexible drill pipe rotator 7, ③ use the 360° azimuth marking plate 5 fixed on the drill pipe holder 3 outside the drilling rig, push and pull the angle adjustment handle 404 to make the water drop level 409 in a horizontal state, and tighten the tightening screw 403 to fix it After the dial, the outer drill rod 4 is rotated, so that the water jet nozzle direction mark 6 is aligned with another position of the water jet construction hole 21 adjacent to the water jet construction hole 21 corresponding to the angle of the dial 405, and a water jet construction hole 21 is activated. The jet drilling rig makes the inner drill pipe 10 drill into L _drill = 21 meters, L ₂ = 40 meters, L ₁ = 30 meters distance, forming the water jet construction hole 22 to another water jet drill adjacent to the direction of the water jet construction hole Hole 21, withdraw the inner drill pipe 10, make the water jet nozzle 12 into the flexible drill pipe rotator 7, repeat the construction process 3, complete a water jet construction hole 22 to all the water jet drills adjacent to the water jet construction hole direction The hole 21 is constructed, the inner drill pipe 10 is withdrawn, the water jet nozzle 12 is put into the flexible drill pipe rotator 7, and the inner drill pipe 10 and the outer drill pipe 4 are pulled out H=4 (generally H=4-10 meters) meters away , repeat the construction process of ② and ③, and complete one water jet construction hole 22 to all water jet holes 21 adjacent to the direction of the water jet construction hole.

Among them: repeat the construction process of ①, ②, and ③, and complete all the water jet drilling holes 22 to all the water jet drilling holes 21 adjacent to the direction of the water jet construction drilling holes.

Among them: 3L ₂ /5≥L _drill ≥ L ₂ /2, 50m ≥ L ₂ ≥ 30 m, 3L ₁ /5 ≥ L _drill ≥ L 1 / ₂ , 50 m ≥ L ₁ ≥ 30 m, H is each section The integer multiple of the effective length of the outer drill pipe 4, 10 meters ≥ H ≥ 4 meters.

Wherein: the number of the water jet meshed water jet construction holes 22 is determined according to needs, ψ is the angle between adjacent water jet holes, and ψ=45°.

Claims (5)

1. a coal seam mesh gas drainage drilling construction method of a water jet drilling rig, including playing some water jet construction drilling holes in the coal seam, is characterized in that: 1. utilize a kind of water jet drilling rig, will have a flexible drill pipe rotator The outer drill pipe is inserted into the bottom of the water jet construction hole of the coal seam, the outer drill pipe is fixed on the main body of the drilling rig with the outer drill pipe holder of the drilling rig, and the inner drill pipe is fixed on the main body of the drilling rig with the inner drill pipe holder of the drilling rig , make the water jet nozzle into the flexible drill pipe rotator, ② use the 360° azimuth marking plate fixed on the drill pipe holder outside the drilling rig, push and pull the adjusting angle handle, make the water droplet level in a horizontal state, and tighten the tightening screw to fix it. After dialing the dial, turn the outer drill pipe so that the water jet nozzle direction marking position is aligned with a position adjacent to the water jet construction drilling hole of the water jet construction drilling hole corresponding to the angle of the dial, and start a water jet drilling rig to make the inner drilling rig. The rod is drilled into the L _drilling distance to form a water jet drilling hole to a water jet drilling hole adjacent to the direction of the water jet construction drilling hole, withdraw the inner drill rod, make the water jet nozzle into the flexible drill rod rotator, On the 360° azimuth marking plate on the outer drill pipe holder of the drilling rig, push and pull the adjusting angle handle to make the water droplet level in a horizontal state. After tightening the tightening screw to fix the dial, turn the outer drill pipe to mark the direction of the water jet nozzle. Aim at the position of the water jet construction drilling hole corresponding to the angle of the dial, which is adjacent to the water jet construction drilling hole, start a water jet drilling rig, and make the inner drill pipe drill the L _drilling distance to form the water jet construction drilling hole to Another water jet drilling hole adjacent to the water jet construction drilling direction, withdraw the inner drill pipe, make the water jet nozzle into the flexible drill pipe rotator, repeat the construction process ③, complete one water jet construction drilling hole to all adjacent water jets For the water jet drilling construction in the drilling direction, withdraw the inner drill pipe, make the water jet nozzle into the flexible drill pipe rotator, pull the inner drill pipe and the outer drill pipe out a distance of H meters, repeat the construction process of ② and ③, and complete One water jet construction hole to all water jet holes in the direction of all adjacent water jet construction holes. 2. the coal seam mesh gas drainage drilling construction method of a kind of water jet drilling rig according to claim 1 is characterized in that: repeat 1., 2., 3. construction process, complete all water jet construction drilling to all adjacent water All water jet boreholes in the borehole direction for jet construction. 3. The coal seam mesh gas drainage drilling construction method of a water jet drilling rig according to claim 1, characterized in that: 3L/5≧L _drill ≧L/2, 50m≧L≧30m, H It is an integer multiple of the effective length of each outer drill pipe, 10 meters ≥ H ≥ 4 meters. 4. The coal seam mesh gas drainage drilling construction method of a water jet drilling rig according to claim 2, characterized in that: 3L/5≥L _drill≥L /2, 50m≥L≥30m, H It is an integer multiple of the effective length of each outer drill pipe, 10 meters ≥ H ≥ 4 meters. 5. The coal seam mesh gas drainage drilling construction method of any one of the water jet drilling rigs according to any one of claims 1-4, is characterized in that: the direction, the depth position of the water jet drilling of the water jet construction drilling , according to the horizontal angle, inclination angle and depth of the water jet construction drilling holes that have been formed and determined, the construction forms the required mesh through gas drainage drilling holes.

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