CN111810085A - A water jet drilling rig and a drilling construction method for coal seam plume gas drainage - Google Patents

Abstract

The invention relates to a water jet drilling machine, which comprises a drilling machine main body which is mechanically connected with a drilling machine inner drill rod holder and a drilling machine outer drill rod holder, and is characterized in that: the side of a drill rod holder outside the drilling machine is provided with a 360-degree azimuth identification disc, the outer side of the end head of each section of outer drill rod is provided with a water jet nozzle direction identification, the front end of the outer drill rod is fixed with a flexible drill rod gyrator, an outer high-pressure rubber pipe is connected with a flexible high-pressure rubber pipe through an inner drill rod connected by a water braid, and the front end of the flexible high-pressure rubber pipe is connected with a water jet nozzle through a section of the flexible drill. The water jet flow feathered drill hole can be directionally constructed according to needs, the gas extraction range of the extraction drill hole is expanded, the pressure relief area is increased, the method is particularly suitable for gas extraction of a low-permeability hard coal seam, such as gas extraction of a anthracite coal seam, and the gas extraction and drainage effect of the coal seam is effectively improved.

Description

A water jet drilling rig and a drilling construction method for coal seam plume gas drainage

technical field

The invention relates to a water jet drilling rig and a drilling method for gas drainage, in particular to a water jet drilling rig and a drilling method for coal seam plume gas drainage.

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 the coal seam drilling in the underground coal mine can drill gas circulation channels with a length of 20-50 meters in the left and right sides of the drilling plane in the range of 4-10 meters (left and right intervals) inward and outward. hole), expand the control range and pressure relief area of the drilling hole, 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 turned and drilled is produced, and the coal seam is used to drill holes. A method of forming a plume interconnected borehole in the coal seam to effectively increase the gas permeability coefficient of the coal seam and improve the effect of gas drainage. But at present, there is a lack of water jet drilling rigs with corresponding orientations, and the construction method of coal seam plume gas drainage drilling cannot be realized.

SUMMARY OF THE INVENTION

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

The technical scheme adopted by the present invention to solve the technical problem is: a water jet drilling rig, which includes a drill pipe holder in the drilling rig mechanically connected to the main body of the drilling rig and a drill pipe holder outside the drilling rig. There is a 360° azimuth marking plate on the side, the direction marking of the water jet nozzle is set on the outside of the end of each outer drill pipe, the flexible drill pipe rotator is fixed at the front end of the outer drill pipe, and the inner drill pipe connected by the external high-pressure hose is connected by a water braid. High-pressure hose, the front end of the flexible high-pressure hose is connected to the water jet nozzle after the flexible drill pipe rotator section.

Among them: there are several collars in the flexible drill pipe rotator.

Among them: the 360° azimuth marking plate is fixed on the drill pipe holder outside the drilling rig through the fixing hole, the 360° azimuth marking plate is set on the base with a dial with an angle adjustment handle, and the upper part of the dial is provided with a half-side gland, A cavity for adjusting the angle is formed. There is a drill hole in the middle of the 360° azimuth marking plate, and a fastening screw is provided from the outside of the base. There is a water drop level.

Among them: the 360° azimuth marking plate can also be fixed on the main body of the drilling rig.

A coal seam plume gas extraction drilling construction method for a water jet drilling rig, which comprises drilling a main hole in a coal seam and withdrawing a drill pipe, and is characterized in that: a water jet drilling rig is used to drill a hole with a flexible drill pipe gyrator. The outer drill pipe is inserted into the bottom of the main drilling hole of the coal seam, and the outer drill pipe is fixed on the main body of the drilling rig with the outer drill pipe holder of the drilling rig. Put the jet nozzle into the flexible drill pipe rotator, use the 360° azimuth marking plate fixed on the drill pipe holder outside the drilling rig, push and pull the adjustment handle to make the water droplet level in a horizontal state, and after tightening the screw to fix the dial, Rotate the outer drill pipe to make the water jet nozzle direction marking position align with the 0° position of the dial, start a water jet drilling rig, make the inner drill pipe drill L meters away, and form a 360° azimuth marking disk at the 0° position of the water jet. Jet plume drilling, ① withdraw the inner drill pipe, make the water jet nozzle into the flexible drill pipe rotator, use the 360° azimuth marking plate fixed on the outer drill pipe holder of the drilling rig, push and pull the adjustment handle to make water droplets The spirit level is in the horizontal state. After tightening the screw to fix the dial, turn the outer drill pipe to make the water jet nozzle direction mark position align with the 180° position of the dial, start a water jet drilling rig, and make the inner drill pipe drill into L meter distance, forming a 180° position water jet plume drilling hole of a 360° azimuth marking plate, 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 meters distance, so that the direction mark of the water jet nozzle is still aligned with the 180° position of the 360° azimuth marking plate, start a water jet drilling rig, make the inner drill pipe drill L meters distance, and form a 360 ° azimuth marking plate 180 ° position water Jet plume drilling, withdraw the inner drill pipe, make the water jet nozzle into the flexible drill pipe rotator, use the 360° azimuth marking plate fixed on the outer drill pipe holder of the drilling rig, push and pull the adjusting angle handle to make the water droplet level. In the horizontal state, after tightening the screw to fix the dial, turn the outer drill pipe to make the water jet nozzle direction mark position align with the 0° position of the dial, start a water jet drilling rig, and make the inner drill pipe drill L meters. distance to form a 0° water jet plume drilling hole of a 360° azimuth marking plate, 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 for a distance of H meters , so that the direction mark of the water jet nozzle is still aligned with the 0° position of the 360° azimuth marking plate, start a water jet drilling rig, make the inner drill pipe drill L meters distance, and form a water jet at the 0° position of the 360° azimuth marking disk Pinnacle drilling.

Among them: Repeat the construction process of ① to form all the water jet plume boreholes.

Among them: 25 meters ≥ L ≥ 15 meters, H is an integer multiple of the effective length of each outer drill pipe, 10 meters ≥ H ≥ 4 meters.

Among them: the 0° angle of the water jet plume borehole at the 0° position of the 360° azimuth marker can be selected in the range of 0°-360°, and the 180° position of the 360° azimuth marker disk is the 180° angle of the water jet plume borehole. The angle can be selected in the range of 0°-360°, and the number of water jet plume drilling holes can be determined according to the needs.

Corresponding methods derived from the above water jet drilling rig's coal seam plume gas drainage drilling construction method 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 plume gas drainage drilling holes from the main drilling hole, and the water jet plume drilling holes can be constructed directionally according to the needs, which expands the capacity of the drainage drilling holes. The gas extraction range increases the pressure relief area, especially suitable for gas extraction in low permeability hard coal seams, such as anthracite coal seam gas extraction, effectively increasing the gas drainage effect of this coal seam.

Description of drawings

The present invention will be further described below with reference to the accompanying drawings and embodiments.

Fig. 1. A schematic diagram of the structure of a water jet drilling rig of the present invention;

Figure 2. Schematic diagram of the structure of the 360° azimuth marking plate of the present invention;

Fig. 3. A-A sectional structure schematic diagram of Fig. 2;

Fig. 4 is a schematic diagram of the structure of a coal seam plume gas drainage drilling hole of a water jet drilling rig of the present invention.

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, 71. Collar, 100. Coal seam, 200. Main borehole, 300.360° azimuth marking plate 0° position water jet plume drilling, 400.360° azimuth marking plate 180° position water jet plume drilling, 401. Base, 402. Half-side gland, 403. Fastening screw, 404 .Angle adjustment handle, 405. Dial, 406. Drill hole, 407. Fixing hole, 408. Cavity for angle adjustment, 409. Water drop level.

Detailed ways

first embodiment

Referring to Figures 1 to 3, a water jet drilling rig includes 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, the outer side of the end of each outer drill pipe 4 is provided with a water jet nozzle direction mark 6, the front end of the outer drill pipe 4 is fixed with a flexible drill pipe rotator 7, and the external high-pressure hose 8 is connected by a water braid 9. The inner drill pipe 10 is connected to a flexible high-pressure hose 11 , and the front end of the flexible high-pressure hose 11 is connected to a water jet nozzle 12 after passing through the 7-stage flexible drill pipe rotator.

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.

Second Embodiment

Referring to Fig. 1 to Fig. 4, a method for drilling a coal seam plume gas extraction drilling of a water jet drilling rig includes drilling a main hole 200 (with a diameter greater than 150 mm) in the coal seam 100, and withdrawing the drill pipe, which is characterized by: using A water jet drilling rig, inserting the outer drill pipe 4 with the flexible drill pipe rotator 7 into the bottom of the main hole 200 of the coal seam 100, and fixing the outer drill pipe 4 on the main body 1 of the drilling rig with the outer drill pipe holder 3 of the drilling rig On the rig, fix the inner drill rod 10 on the main body 1 of the drilling rig with the inner drill rod holder 2 of the drilling rig, make the water jet nozzle 12 go into the flexible drill rod rotator 7, and use the drill rod fixed on the outer drill rod holder 3 of the drilling rig. 360° azimuth marking plate 5, push and pull the angle adjustment handle 404 to make the water drop level 409 in a horizontal state, tighten the tightening screw 403 to fix the dial, then turn the outer drill rod 4, so that the water jet nozzle direction mark 6 is aligned with the dial At the 0° position of 405, start a water jet drilling rig, make the inner drill pipe 10 drill L=20 (generally L=15-25 meters) meters away, and form a water jet plume at the 0° position of the 360° azimuth marking plate 5 1. Withdraw the inner drill rod 10, move the water jet nozzle 12 into the flexible drill rod rotator 7, use the 360° azimuth marking plate 5 fixed on the outer drill rod holder 3 of the drilling rig, push and pull to adjust the angle Handle 404, make the water droplet level 409 in a horizontal state, tighten the tightening screw 403 to fix the dial, turn the outer drill rod 4, align the water jet nozzle direction mark 6 with the 180° position of the dial 405, start a water jet The jet drilling rig makes the inner drill pipe 10 drill into the distance of L=20 (generally L=15-25 meters) meters, forming a water jet plume hole 400 at the 180° position of the 360° azimuth marking plate 5, and withdraws the inner drill pipe 10. Make the water jet nozzle 12 into the flexible drill pipe rotator 7, and pull out the inner drill pipe 10 and the outer drill pipe 4 for a distance of H=4 (generally H=4-10 meters) meters, so that the direction mark 6 of the water jet nozzle is still there. Aim at the 180° position of the 360° azimuth marking plate 5, start a water jet drilling rig, and make the inner drill pipe 10 drill into the distance of L=20 (generally L=15-25 meters) meters to form a 360° azimuth marking plate 5 The water jet plume drilling 400 at the 180° position, withdraw the inner drill pipe 10, make the water jet nozzle 12 into the flexible drill pipe rotator 7, and mark it with the 360° azimuth fixed on the outer drill pipe holder 3 of the drilling rig Plate 5, push and pull the angle adjustment handle 404 to make the water drop level 409 in a horizontal state, tighten the tightening screw 403 to fix the dial, turn the outer drill rod 4, so that the water jet nozzle direction mark 6 is aligned with the 0° of the dial 405 position, start a water jet drilling rig, make the inner drill pipe 10 drill L=20 (generally L=15-25 meters) meters distance, and form a 360° azimuth marking plate 5 at the 0° position of the water jet plume drilling 300 , withdraw the inner drill pipe 10, make the water jet nozzle 12 into the flexible drill pipe rotator 7, and pull out the inner drill pipe 10 and the outer drill pipe 4 by a distance of H=4 (generally H=4-10 meters) meters, so that the water The jet nozzle direction mark 6 is still aligned with the 360° azimuth mark At the 0° position of the disk 5, start a water jet drilling rig, so that the inner drill pipe 10 is drilled into a distance of L=20 (generally L=15-25 meters) meters, forming a 360° azimuth marking the 0° position of the disk 5. The water jet Pinnacle drilling 300.

Among them: Repeat the construction process of ① to form all the water jet plume boreholes.

Among them: 25 meters ≥ L ≥ 15 meters, H is an integer multiple of the effective length of each outer drill pipe 4, 10 meters ≥ H ≥ 4 meters.

Among them: the 0° angle of the water jet plume borehole 300 at the 0° position of the 360° azimuth marker plate 5 can be selected and determined in the range of 0°-360°, and the 180° position of the 360° azimuth marker plate 5 The water jet plume borehole The 180° angle of 400 can be selected and determined in the range of 0°-360°, and the number of water jet plume drilling holes can be determined according to needs.

Claims (10)

1. a water jet drilling rig, comprising the main body of the drilling rig mechanically connected to the inner drill pipe holder of the drilling rig and the outer drill pipe holder of the drilling rig, it is characterized in that: the side of the outer drill pipe holder of the drilling rig is provided with a 360° azimuth identification disc, and each section is provided with a 360° orientation identification disc. The outer side of the end of the outer drill pipe is provided with a water jet nozzle direction mark, the front end of the outer drill pipe is fixed with a flexible drill pipe rotator, the outer high pressure hose is connected to the inner drill pipe by the water braid, and the front end of the flexible high pressure hose is connected to the flexible high pressure hose through the flexible drill pipe. The water jet nozzles are connected after the gyrator section. 2 . The water jet drilling rig according to claim 1 , wherein the flexible drill pipe rotator is provided with several collars. 3 . 3. A water jet drilling rig according to claim 1, characterized in that: the 360° azimuth marking disc is fixed on the drill pipe holder outside the drilling rig through the fixing hole, and the 360° azimuth marking disc is set on the base by There is a dial with a handle for adjusting the angle on the dial. The upper part of the dial is provided with a half-side gland to form a cavity for adjusting the angle. There is a drill hole in the middle of the 360° azimuth marking dial, and a fastening screw is provided from the outside of the base. The 360° ° The dial of the azimuth marker is marked with a 0°-360° scale, and is equipped with a water drop level. 4. A water jet drilling rig according to claim 2, characterized in that: the 360° azimuth marking plate is fixed on the outer drill pipe holder of the drilling rig through fixing holes, and the 360° azimuth marking plate is arranged on the base by There is a dial with a handle for adjusting the angle on the dial. The upper part of the dial is provided with a half-side gland to form a cavity for adjusting the angle. There is a drill hole in the middle of the 360° azimuth marking dial, and a fastening screw is provided from the outside of the base. The 360° ° The dial of the azimuth marker is marked with a 0°-360° scale, and is equipped with a water drop level. 5 . The water jet drilling rig according to claim 1 , wherein the 360° azimuth marking plate can also be fixed on the main body of the drilling rig. 6 . 6. A coal seam plume gas extraction drilling construction method of a water jet drilling rig, comprising drilling a main hole in the coal seam and withdrawing the drill pipe, characterized in that: a water jet drilling rig is used to rotate a flexible drill pipe The outer drill pipe of the drill is inserted into the bottom of the main drilling 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 Put the water jet nozzle into the flexible drill pipe rotator, use 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 droplet level in a horizontal state, and tighten the tightening screw to fix the dial Then, turn the outer drill pipe to make the water jet nozzle direction marking position align with the 0° position of the dial, start a water jet drilling rig, and make the inner drill pipe drill the distance of L meters, forming a 360° azimuth marking disk at 0° Position the water jet plume drilling, ① withdraw the inner drill pipe, make the water jet nozzle into the flexible drill pipe rotator, use the 360° azimuth marking plate fixed on the outer drill pipe holder of the drilling rig, push and pull the adjustment angle handle, Make the water droplet level in a horizontal state, tighten the screw to fix the dial, turn the outer drill pipe, make the water jet nozzle direction mark position align with the 180° position of the dial, start a water jet drilling rig, make the inner drill pipe drill Enter the distance of L meters to form a 180° position water jet plume drilling hole of a 360° azimuth marking plate, 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 At a distance of H meters, the direction mark of the water jet nozzle is still aligned with the 180° position of the 360° azimuth marking plate, and a water jet drilling rig is started to drill the inner drill pipe into a distance of L meters, forming a 180° position of the 360° azimuth marking plate. Position the water jet plume to drill holes, withdraw the inner drill pipe, make the water jet nozzle into the flexible drill pipe rotator, use the 360° azimuth marking plate fixed on the outer drill pipe holder of the drilling rig, push and pull the adjustment angle handle to make The water droplet level is in the horizontal state. After tightening the screw to fix the dial, turn the outer drill pipe to make the water jet nozzle direction mark position align with the 0° position of the dial, start a water jet drilling rig, and make the inner drill pipe drill With a distance of L meters, form a 360° azimuth marker disk at the 0° position of the water jet plume drilling, 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, so that the direction mark of the water jet nozzle is still aligned with the 0° position of the 360° azimuth marking plate, start a water jet drilling rig, make the inner drill pipe drill L meters distance, and form a 360 ° azimuth marking plate at the 0° position Water jet plume borehole. 7. The coal seam plume gas drainage drilling construction method of a water jet drilling rig according to claim 6, characterized in that: repeating the construction process of ① forms all water jet plume drillings. 8. The coal seam plume gas extraction drilling construction method of a water jet drilling rig according to claim 6, characterized in that: 25 m≧L≧15 m, and H is an integer multiple of the effective length of the outer drill pipe of each section , 10 meters ≥ H ≥ 4 meters. 9. The coal seam plume gas extraction drilling construction method of a water jet drilling rig according to claim 7, characterized in that: 25 m≧L≧15 m, and H is an integer multiple of the effective length of the outer drill pipe of each section , 10 meters ≥ H ≥ 4 meters. 10. The coal seam plume gas drainage drilling construction method of any one of the water jet drilling rigs according to any one of claims 6-9, characterized in that: the 0° position water jet plume drilling of the 360° azimuth marking plate The 0° angle can be selected in the range of 0°-360°, and the 180° angle of the water jet plume drilling at the 180° position of the 360° azimuth marking plate can be selected and determined in the range of 0°-360°. The number of holes is determined as required.

Images