CN114809915B - Hole drilling, sealing and pressure measuring integrated device and pressure measuring method for coal seam deep and long hole - Google Patents
Hole drilling, sealing and pressure measuring integrated device and pressure measuring method for coal seam deep and long hole Download PDFInfo
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- CN114809915B CN114809915B CN202210396411.1A CN202210396411A CN114809915B CN 114809915 B CN114809915 B CN 114809915B CN 202210396411 A CN202210396411 A CN 202210396411A CN 114809915 B CN114809915 B CN 114809915B
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- 238000005553 drilling Methods 0.000 title claims abstract description 96
- 238000007789 sealing Methods 0.000 title claims abstract description 44
- 239000003245 coal Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 16
- 210000000078 claw Anatomy 0.000 claims abstract description 42
- 238000004873 anchoring Methods 0.000 claims abstract description 34
- 238000007906 compression Methods 0.000 claims abstract description 20
- 230000006835 compression Effects 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 61
- 239000007789 gas Substances 0.000 claims description 34
- 238000009530 blood pressure measurement Methods 0.000 claims description 25
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 3
- 239000013013 elastic material Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000000605 extraction Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000012856 packing Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 239000002775 capsule Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012625 in-situ measurement Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/18—Pipes provided with plural fluid passages
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/128—Packers; Plugs with a member expanded radially by axial pressure
- E21B33/1285—Packers; Plugs with a member expanded radially by axial pressure by fluid pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/129—Packers; Plugs with mechanical slips for hooking into the casing
- E21B33/1295—Packers; Plugs with mechanical slips for hooking into the casing actuated by fluid pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
- E21B47/117—Detecting leaks, e.g. from tubing, by pressure testing
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
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Abstract
The invention belongs to the technical field of manufacturing of high-end equipment in mine gas extraction, and particularly relates to a hole-sealing and pressure-measuring integrated device for a coal seam deep and long hole and a pressure-measuring method. The drilling sealer mainly comprises a hydraulic chamber, an anchoring claw and a compression type sealing rubber cylinder; the hydraulic chamber provides pressure, and the anchoring claw is used for fixing drilling rod and drilling hole sealer, and the compression type sealing rubber cylinder can be used for plugging a drilling hole. The device is connected with the drill bit by using the drilling sealer, can directly measure pressure in a long drill hole without withdrawing the drill rod, thereby avoiding the problems of collapse of the drill hole, gas leakage and the like caused by withdrawing the drill rod.
Description
Technical Field
The invention belongs to the technical field of manufacturing of high-end equipment in mine gas extraction, and particularly relates to a coal seam deep and long hole drilling, hole sealing and pressure measuring integrated device and a pressure measuring method.
Background
The gas pressure of the coal bed is one of the basic parameters of the mine gas, and has very important significance for determining the gas content of the coal bed, controlling the gas emission of the mine, draining the gas, preventing and controlling the outburst of the coal and the gas and the like. Most of the existing gas pressure measuring methods are to drill holes firstly, remove drill rods after drilling to a proper depth, send the drill rods into a hole sealing pressure measuring device, and measure pressure after sealing the drill holes. For example, in a Chinese patent with publication number CN111980682A and the invention name "a device and a method for testing the gas pressure of an ultra-long drilling coal seam", after a drilling hole reaches a specified position, a drill rod is withdrawn, and a driving and traveling device is used for driving a gas pressure sensor and an expansion capsule to reach a pressure measuring air chamber. However, in the process of withdrawing the drill rod, partial gas in the coal body is released, disturbance is caused to the gas pressure of the coal bed, the expansion capsule can rub with the hole wall in the process of traveling, the good sealing performance cannot be guaranteed, and the difficulty of measurement is increased. Most of drilling lengths are about 100 meters at present, but along with the popularization of directional kilometer drilling machines, the long drilling holes more than 300 meters in coal mines are more and more, when the long drilling holes are used for gas pressure measurement, the problems that a plugging device is difficult to send to a deep position, when a drill rod is withdrawn, the drilling holes collapse, are easy to block and the like can occur, the next pressure measurement work cannot be carried out, and the pressure measurement device with the deep long holes is designed, particularly the device capable of accurately measuring the pressure needs to be solved urgently.
Disclosure of Invention
The invention aims to provide a drilling, hole sealing and pressure measuring integrated device for a coal seam deep and long hole and a pressure measuring method. The method does not need to withdraw the drill rod, can simultaneously carry out drilling and hole sealing pressure measurement, can carry out in-situ measurement at the drilling position, has more accurate measurement of gas pressure, and is more suitable for measuring the gas pressure in the long drill hole.
In order to achieve the purpose, the invention adopts the technical scheme that:
a hole sealing and pressure measuring integrated device for drilling holes in deep and long holes of a coal seam comprises a directional drilling machine, a high-pressure water pump, a pneumatic pump, a pressure gauge, a water tail, a double-layer drill rod, a drill bit and a drilling sealer, wherein the double-layer drill rod comprises an inner channel and an outer channel, the inner channel of the double-layer drill rod is connected with the outer channel of the double-layer drill rod through a supporting plate, when the device is used as a drilling device, the tail of the double-layer drill rod is connected with the directional drilling machine during drilling, and the inner channel is communicated with the high-pressure water pump; when using as the pressure measurement device, still including setting up the water tail between double-deck drilling rod and directional drilling machine, the water tail is equipped with two entries, entry one and interior passageway UNICOM, entry two and outer passageway UNICOM, and the passageway is as gas pressure measurement passageway through an entry connecting pneumatic pump and manometer in the double-deck drilling rod during the pressure measurement, and outer passageway provides hydraulic pressure through two connection high pressure hydraulic pumps of entry, the double-deck drilling rod outside is located to the sealed cover of drilling is used for fixed drilling rod, sealed drilling, and double-deck drilling rod head is equipped with the drill bit.
Furthermore, the drilling sealer is positioned at the diameter reduction section of an outer channel at the front end of the drill rod, the outer diameter of the drilling sealer is smaller than the outer diameter of the drill bit when the drilling sealer does not work, so that the drilling sealer is not in contact with the wall of a drill hole when the drilling sealer drills, the drilling sealer comprises a claw seat positioned at the front end, a compression type sealing rubber cylinder positioned at the rear end and a shell positioned in the middle, a rear piston is arranged at the rear end in the shell, a front piston is arranged at the front end in the shell, a back support is arranged at the front end of the front piston, the compression type sealing rubber cylinder, the front piston, the rear piston and the back support are movably sleeved outside the double-layer drill rod, the claw seat is a bulge seat fixedly arranged outside the double-layer drill rod, a plurality of anchoring claws matched with the back support are arranged at the rear end of the claw seat, a hydraulic chamber is arranged between the front piston and the rear piston, at least one through hole is respectively arranged on the outer channel of the double-layer drill rod where the hydraulic chamber is positioned, the outer channel is communicated with the hydraulic chamber through hole, the front piston and the rear piston are freely slidable in the hydraulic chamber, wherein the rear piston is connected with the sealing rubber cylinder, the sealing rubber cylinder is outwards expanded when the compression type sealing rubber cylinder is extruded, so as to plug the compression type drilling hole; the front piston is connected with a top support, and the top support can enable the anchoring claw to be spread and clamped into the wall of the drill hole to fix the drill hole sealer.
Further, back piston rear end is equipped with a boss portion, and this boss portion is located the casing outside, the casing front end is equipped with an inside card platform that extends, the shore front end all is equipped with a bar groove for toper platform form and shore outside upper surface, and the bar groove is located the shore middle part and cooperatees with the card platform of casing front end and uses, the inboard wedge that is the fretwork of anchoring claw, anchoring claw opening are greater than shore front end toper platform height, and anchoring claw and shore are elastic material and make, and bar groove length is greater than the distance that the shore front end is farthest from anchoring claw, and the purpose that sets up like this can be ensured that anchoring claw struts under the condition that the bar groove still leaves surplus length struts and bores in the hole wall, and the bearing capacity of the sealed packing element of compression is greater than anchoring claw's bearing capacity.
Furthermore, a middle nozzle is arranged in the center of the drill bit and communicated with the inner channel.
A pressure measuring method of a coal seam deep and long hole drilling, hole sealing and pressure measuring integrated device comprises the following steps:
(1) The high-pressure water pump is connected with the first water tail inlet through the directional drilling machine, the directional drilling machine is started to provide power for drilling, the high-pressure water pump is started, and water jet is sprayed out through a middle nozzle of a drill bit to cool and reduce dust;
(2) Stopping drilling when the drill reaches a pressure measuring position, withdrawing the directional drilling machine, closing the high-pressure water pump, connecting the high-pressure water pump to the water tail inlet II, and connecting the pneumatic pump to the water tail inlet I;
(3) Opening a high-pressure water pump, injecting high-pressure water through a water tail inlet two-way double-layer drill rod outer channel, enabling the high-pressure water to enter a hydraulic chamber, pushing a front piston to slide forwards under the action of pressure, enabling a top support to move forwards by the front piston, opening an anchoring claw until the water pressure is increased to 10MPa, clamping the anchoring claw into the wall surface of a drill hole, and fixing a drill hole sealer and a drill rod; meanwhile, the rear piston slides backwards to extrude the compression type sealing rubber cylinder to expand outwards, and when the pressure is increased to 20MPa, the sealing rubber cylinder is completely compressed to finish drilling and plugging;
(4) After the drill hole is plugged, opening a pneumatic pump, pumping nitrogen with the same pressure as the pre-estimated gas pressure into the pressure measurement coal seam, using a pressure gauge to measure the gas pressure in the channel after the pneumatic pump is closed, and when the gas pressure in the channel is unchanged within 1h, well sealing the drill hole;
(5) And (3) opening the air pressure pump, introducing nitrogen into the measured coal bed through the double-layer drill pipe channel, observing the reading of the air pressure meter after stopping injecting the nitrogen, and when the reading of the air pressure meter is stable and is continuously unchanged for 5 days, achieving gas pressure balance and completing drilling pressure measurement.
(6) After the pressure measurement is finished, the high-pressure water pump is closed, the pressure in the hydraulic cavity of the drilling sealer is gradually reduced to 0, and the compression type sealing rubber cylinder and the anchoring claw are retracted under the action of the elastic force to realize deblocking.
The invention has the advantages that:
1. the device does not need to withdraw the drill rod, avoids disturbance to gas when the drill rod is withdrawn, and ensures that the measured gas pressure is more accurate;
2. the device can realize simultaneous drilling and hole sealing pressure measurement, and performs in-situ pressure measurement at the position of the drill bit, so that the interference is reduced, and the device is more suitable for long-drill-hole pressure measurement of more than 300 meters;
3. the device is characterized in that a drilling sealer is connected with a drill bit, can enter a long drill hole to be plugged while drilling, and reduces friction between a sealing rubber cylinder and the hole wall;
4. the device can detect the sealing performance of the drill hole in time after plugging the drill hole, and can adopt an active pressure measurement method to accelerate gas permeation by filling inert gas into a pressure measurement coal bed, thereby shortening the pressure measurement time.
5. The device has wide application range, and the gas pressure can be measured by using the method for drilling coal seams and rock strata.
Drawings
Fig. 1 is a schematic diagram of the coal seam drilling manometry of the present invention.
FIG. 2 is a cross-sectional view of the drill pipe and drill pipe sealer of the present invention.
FIG. 3 is a cross-sectional view of a double-layer drill pipe of the present invention.
FIG. 4 is a drill pipe water tail connection diagram of the present invention.
1-water tail; 2-double layers of drill pipes; 3-drilling hole sealer; 4-a drill bit; 5-directional drilling machine; 6-high pressure water pump; 7-a pneumatic pump; 8-barometer; 11-inlet one; 12-a sealed interface; 13-inlet two; 21-an inner channel; 22-an outer channel; 23-double-layer drill pipe inner wall; 24-double layer drill pipe outer wall; 25-a support plate; 31-compression type sealing rubber cylinder; 32-rear piston; 33-front piston; 34-a hydraulic chamber; 35-a housing; 36-top bracing; 37-anchoring claws; 38-anchoring jaw seat; 4-a drill bit; 41-middle nozzle.
Detailed Description
The terms front and rear in the present embodiment are based on the forward direction of the drill rod, and the upper and lower directions are based on the orientation in the drawing.
As shown in the figure, the device mainly comprises a directional drilling machine 5, a high-pressure water pump 6, a pneumatic pump 7, a pressure gauge 8, a water tail 1, a double-layer drill rod 2, a drill bit 4, a drilling sealer 3 and the like; the double-layer drill rod 2 is divided into an inner channel and an outer channel, and the inner wall 23 of the double-layer drill rod is connected with the outer wall 24 of the double-layer drill rod through a support plate 25; when drilling, the double-layer drill rod is connected with the directional drilling machine 5, and the inner channel 21 is communicated with the high-pressure water pump 6; when the device is used as a pressure measuring device, the device also comprises a water tail 1 arranged between a double-layer drill rod 2 and a directional drilling machine 5, wherein the water tail 1 is provided with two inlets, the inlet I11 is communicated with an inner channel 21, the inlet II 13 is communicated with an outer channel 22, the inner channel 21 of the double-layer drill rod is connected with a pneumatic pump 7 and a pressure gauge 8 through the inlet I11 to serve as a gas pressure measuring channel during pressure measurement, the outer channel 22 is connected with a high-pressure water pump 6 through the inlet II 14 to provide hydraulic pressure, the drill hole sealer 3 is sleeved outside the double-layer drill rod 2 and used for fixing the drill rod and sealing a drill hole, the head of the double-layer drill rod 2 is provided with a drill bit 4, the center of the drill bit 4 is provided with a middle nozzle 41, the middle nozzle 41 is communicated with the inner channel 21, the drill hole sealer 3 is positioned at the diameter reduction section of the outer channel 22 at the front end of the drill rod, and the outer diameter of the drill hole sealer 3 is smaller than the outer diameter of the drill bit when the drill hole sealer 3 does not work so as to ensure that the drill hole sealer is not contacted with the drill hole wall during drilling, the drilling sealer 3 comprises a claw seat 38 positioned at the front end, a compression type sealing rubber cylinder 31 positioned at the rear end and a shell 35 positioned at the middle part, wherein a rear piston 32 is arranged at the rear end in the shell 35, a front piston 33 is arranged at the front end in the shell, a top support 36 is arranged at the front end of the front piston 33, the compression type sealing rubber cylinder 31, the front piston 33, the rear piston 32 and the top support 36 are all movably sleeved outside the double-layer drill rod 2, the claw seat 38 is a raised seat fixedly arranged outside the double-layer drill rod, a plurality of anchoring claws 37 matched with the top support are arranged at the rear end of the claw seat 38, a hydraulic chamber 34 is arranged between the front piston 33 and the rear piston 32, at least one through hole is respectively arranged on an outer channel of the double-layer drill rod where the hydraulic chamber 34 is positioned, the outer channel 22 is communicated with the hydraulic chamber 34 through the through hole, and a front piston and a rear piston capable of freely sliding are arranged in the hydraulic chamber 34, the rear piston is connected with a compression type sealing rubber cylinder 31, and the sealing rubber cylinder 31 expands outwards when being extruded to plug a drilled hole; the front piston is connected with a top support, and the top support can enable the anchoring claw to be spread and clamped into the wall of the drill hole to fix the drill hole sealer; the utility model discloses a drilling hole drilling tool, including back piston 32, back piston, sealed packing element, casing 35 front end, 36 front ends of shore, back piston 32 rear end is equipped with a boss portion, and this boss portion is located the casing outside and is adjacent with sealed packing element, the casing 35 front end is equipped with a calorie platform of inward extension, the 36 front ends of shore are the frustum form and the outside upper surface of shore all is equipped with a bar groove, and the bar groove is located the shore middle part and uses with the calorie platform cooperation of casing front end, 37 inboard wedges for the fretwork that are of anchoring claw, and the anchoring claw opening is greater than shore front end toper platform height, and anchoring claw and shore are elastic material and make, and bar groove length is greater than the distance that shore front end distance is farthest from anchoring claw, and the purpose that sets up like this can ensure that anchoring claw struts under the condition that bar groove still leaves surplus length struts and drills into the wall, and the bearing capacity of sealed packing element of compression is greater than anchoring claw.
A pressure measuring method of a coal seam deep and long hole drilling, hole sealing and pressure measuring integrated device comprises the following steps:
(1) The high-pressure water pump 6 is connected with the water tail inlet 11 through the directional drilling machine 5, the directional drilling machine 5 is turned on, the directional drilling machine provides power to drill holes, the high-pressure water pump is turned on, and water jet is sprayed out through the middle nozzle 41 of the drill bit to cool and reduce dust.
(2) When the drill reaches the pressure measuring position, the drilling is stopped, the directional drilling machine 5 is removed, the high-pressure water pump 6 is turned off and connected to the water tail inlet 14, and the pneumatic pump 7 is connected to the water tail inlet 11.
(3) Opening the high-pressure water pump 6, injecting high-pressure water into the double-layer drill rod channel 22 through the water tail inlet 14, enabling the high-pressure water to enter the hydraulic chamber 34, pushing the piston 33 to slide forwards under the action of the pressure, enabling the top support 36 to move forwards through the piston, opening the anchoring claw 37, and clamping the anchoring claw into the wall surface of a drill hole to fix the drill hole sealer 3 and the drill rod 2 when the water pressure is gradually increased to 10 MPa; meanwhile, the piston 32 slides backwards to extrude the compression type sealing rubber cylinder 31 to expand outwards, and when the pressure is gradually increased to 20MPa, the sealing rubber cylinder is completely compressed to complete drilling and plugging.
(4) And after the drill hole is plugged, opening the pneumatic pump 7, pumping nitrogen with the same pressure as the pre-estimated gas pressure into the pressure measurement coal seam, using the pressure gauge 8 to measure the gas pressure in the channel 21 after the pneumatic pump is closed, and when the gas pressure in the channel 21 does not change obviously within 1h, the drill hole is sealed well.
(5) And (3) opening the air pressure pump, introducing a large amount of nitrogen into the coal bed to be measured through the double-layer drill pipe channel 21, accelerating the gas permeation process, observing the reading of the air pressure meter 8 after stopping injecting the nitrogen, and when the reading of the air pressure meter is stable and does not change obviously for 5 days continuously, achieving gas pressure balance and completing drilling and pressure measurement.
(6) After the pressure measurement is finished, the high-pressure water pump 6 is closed, the pressure in the hydraulic cavity 34 of the drilling sealer is gradually reduced to 0, and the compression type sealing rubber cylinder 31 and the anchoring claw 37 are retracted under the action of the elastic force to realize the deblocking.
Claims (3)
1. The utility model provides a coal seam deep slot hole drilling hole sealing pressure measurement integrated device which characterized in that: the drilling device comprises a directional drilling machine, a high-pressure water pump, a pneumatic pump, a pressure gauge, a water tail, a double-layer drill rod, a drill bit and a drilling sealer, wherein the double-layer drill rod comprises an inner double-layer channel and an outer double-layer channel, the inner channel of the double-layer drill rod and the outer channel of the double-layer drill rod are connected through a supporting plate, the tail of the double-layer drill rod is connected with the directional drilling machine during drilling, and the inner channel is communicated with the high-pressure water pump; the water tail is arranged between the double-layer drill rod and the directional drilling machine, the water tail is provided with two inlets, the inlet I is communicated with the inner channel, the inlet II is communicated with the outer channel, the inner channel of the double-layer drill rod is connected with the air pressure pump and the pressure gauge through the inlet I during pressure measurement, the outer channel is connected with the high-pressure water pump through the inlet II, the drilling hole sealer is sleeved on the outer side of the double-layer drill rod, and the head of the double-layer drill rod is provided with a drill bit; the drilling sealer is positioned at the diameter reduction section of the outer channel at the front end of the drill rod, the outer diameter of the drilling sealer is smaller than the outer diameter of a drill bit when the drilling sealer does not work, the drilling sealer comprises a claw seat positioned at the front end, a compression type sealing rubber cylinder positioned at the rear end and a shell positioned in the middle, a rear piston is arranged at the rear end in the shell, a front piston is arranged at the front end in the shell, a jacking is arranged at the front end of the front piston, the compression type sealing rubber cylinder, the front piston, the rear piston and the jacking are movably sleeved outside the double-layer drill rod, the claw seat is a bulge seat fixedly arranged outside the double-layer drill rod, a plurality of anchoring claws matched with the jacking are arranged at the rear end of the claw seat, a hydraulic cavity is arranged between the front piston and the rear piston, at least one through hole is respectively arranged on the outer channel of the double-layer drill rod where the hydraulic cavity is positioned, and the outer channel is communicated with the hydraulic cavity through hole; the utility model discloses a piston, including back piston, back piston rear end, casing front end, bar groove, back piston rear end, this boss portion is located the casing outside, the casing front end is equipped with a card platform of inside extension, the shore front end all is equipped with a bar groove for toper platform form and shore outside upper surface, the bar groove is located shore middle part and cooperatees with the card platform of casing front end and uses, the inboard wedge that is the fretwork of anchoring claw, anchoring claw opening are greater than shore front end toper platform height, and anchoring claw and shore are elastic material and make, and bar groove length is greater than shore front end distance farthest from anchoring claw.
2. The coal seam deep and long hole drilling, hole sealing and pressure measuring integrated device according to claim 1, characterized in that: the center of the drill bit is provided with a middle nozzle which is communicated with the inner channel.
3. The pressure measuring method of the coal seam depth long hole drilling and sealing pressure measuring integrated device according to any one of claims 1-2, characterized by comprising the following steps:
(1) The high-pressure water pump is connected with the first water tail inlet through the directional drilling machine, the directional drilling machine is started to provide power for drilling, the high-pressure water pump is started, and water jet is sprayed out through a nozzle in the middle of a drill bit to cool and reduce dust;
(2) Stopping drilling when the drill reaches a pressure measuring position, withdrawing the directional drilling machine, closing the high-pressure water pump, connecting the high-pressure water pump to the water tail inlet II, and connecting the pneumatic pump to the water tail inlet I;
(3) Opening a high-pressure water pump, injecting high-pressure water through a water tail inlet two-way double-layer drill rod outer channel, enabling the high-pressure water to enter a hydraulic chamber, pushing a front piston to slide forwards under the action of pressure, enabling a top support to move forwards by the front piston, opening an anchoring claw until the water pressure is increased to 10MPa, clamping the anchoring claw into the wall surface of a drill hole, and fixing a drill hole sealer and the drill rod; meanwhile, the rear piston slides backwards to extrude the compression type sealing rubber cylinder to expand outwards, and when the pressure is increased to 20MPa, the sealing rubber cylinder is completely compressed to finish drilling and plugging;
(4) After the drill hole is plugged, opening a pneumatic pump, pumping nitrogen with the same pressure as the pre-estimated gas pressure into the pressure measurement coal seam, using a pressure gauge to measure the gas pressure in the channel after the pneumatic pump is closed, and when the gas pressure in the channel is unchanged within 1h, well sealing the drill hole;
(5) Opening a pneumatic pump, introducing nitrogen into the coal seam to be measured through a double-layer drill pipe channel, observing the reading of a barometer after stopping injecting the nitrogen, and when the reading of the barometer is stable and is continuously unchanged for 5 days, achieving gas pressure balance and completing drilling pressure measurement;
(6) After the pressure measurement is completed, the high-pressure water pump is closed, the pressure in the hydraulic cavity of the drilling sealer is gradually reduced to 0, and the compression type sealing rubber cylinder and the anchoring claw are withdrawn under the action of elasticity to realize deblocking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210396411.1A CN114809915B (en) | 2022-04-15 | 2022-04-15 | Hole drilling, sealing and pressure measuring integrated device and pressure measuring method for coal seam deep and long hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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