CN113107469B - Device and method for measuring gas pressure through underground long drilling - Google Patents
Device and method for measuring gas pressure through underground long drilling Download PDFInfo
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- CN113107469B CN113107469B CN202110491201.6A CN202110491201A CN113107469B CN 113107469 B CN113107469 B CN 113107469B CN 202110491201 A CN202110491201 A CN 202110491201A CN 113107469 B CN113107469 B CN 113107469B
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- pressure
- pipeline
- grouting
- pressure measuring
- drilling
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- 238000005553 drilling Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 239000007789 gas Substances 0.000 claims description 40
- 238000009530 blood pressure measurement Methods 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 230000001681 protective effect Effects 0.000 claims description 14
- 238000005086 pumping Methods 0.000 claims description 12
- 238000013461 design Methods 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 239000003566 sealing material Substances 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 239000004047 hole gas Substances 0.000 claims 1
- 239000003245 coal Substances 0.000 abstract description 13
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000000605 extraction Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Abstract
The application discloses a device and a method for measuring gas pressure of underground long drilling holes. The pressure measuring device and the pressure measuring method solve the problem that the hole sealing section and the pressure measuring chamber are shallower in the existing pressure measuring method, and ensure the rapid and tight hole sealing in long drilling holes and the measurement of the gas pressure of a long-distance coal seam.
Description
Technical Field
The application relates to the technical field of coal mine safety and geological exploration, in particular to a device and a method for measuring gas pressure by underground long drilling.
Background
The gas pressure is the pressure of the gas in the coal rock stratum, and is an important basic parameter in the aspects of mine gas disaster prevention, gas extraction and utilization and the like. The process of directly measuring the gas pressure of the coal seam through measuring the drill hole and the corresponding measuring method in the underground coal mine is called direct measurement of the gas pressure of the coal seam in the underground coal mine. According to whether compensating gas is injected into the pressure measuring drill hole during pressure measurement, the measuring method can be divided into an active pressure measuring method and a passive pressure measuring method.
At present, direct measurement of underground gas pressure of a coal mine is commonly carried out on a short hole to carry out hole sealing and pressure measurement, after a drilling hole is carried out to a preset depth, the drilling hole is washed cleanly and all drill rods are withdrawn, then a pressure measuring pipe and a grouting pipe are arranged in the drilling hole, the hole opening section is plugged by adopting a hole sealing injecting material, and the hole sealing success rate is lower and the gas pressure measurement is distorted due to a relatively loose structure of a coal bed or cracks generated by roadway excavation and pressure relief. Therefore, when long drilling is implemented, the hole sealing section and the pressure measuring chamber are arranged at the tail end of the long drilling which is not affected by mining, and the method is an effective means for accurately measuring the in-situ gas pressure of the coal stratum.
Disclosure of Invention
In view of the above background, the technical problem to be solved by the application is to provide a device and a method for measuring gas pressure, which solve the problem that a hole sealing section and a pressure measuring chamber are shallower in the existing pressure measuring technology.
In order to achieve the purpose, the application provides a downhole long drilling gas pressure measuring device, which comprises a protective pipe body, wherein the tail end of the protective pipe body is communicated with a screen pipe, a plurality of air holes are formed in the screen pipe, and the screen pipe is communicated with a pressure measuring chamber through the air holes; the tail end of the protection pipe body is fixed on the drill rod through releasing;
the two ends of the outer side of the protection pipe body are provided with rubber barrel type packers, the rubber barrel type packers are communicated with the inner part of the protection pipe body through one-way valves, and grouting outlets are arranged on the protection pipe body between the rubber barrel type packers;
a flexible preset pipeline is arranged in the protective pipe body, and the preset pipeline is wound on an inner rod of the protective pipe body; the preset pipeline comprises a pressure measuring pipeline and a grouting pipeline, the tail end of the pressure measuring pipeline is fixed inside the screen pipe, and the tail end of the grouting pipeline is fixed on the grouting outlet.
Preferably, a support ring is arranged in the middle of the inner rod and is used for separating the pressure measuring pipeline from the grouting pipe section; the pressure measuring pipeline is wound at one end of the inner rod, which is close to the sieve tube, and the grouting pipeline is wound at one end of the inner rod, which is close to the releasing device.
Based on the device, the application also provides a method for measuring the gas pressure of the underground long drilling hole, which comprises the following steps:
s1: drilling is designed, and drilling aperture, hole depth, hole sealing position and drilling track parameters are designed according to regional geological features, gas pressure measurement purposes and gas pressure device size measurement;
s2: drilling construction, namely drilling construction is carried out according to the drilling design, and drilling is carried out to a designed depth, and drilling cuttings in the drilling are washed cleanly and exit the drill rod;
s3: the pressure measuring device is fed in, the pressure measuring device is fixed at the bottom of the drill rod through releasing, and the upper end of the threshold pipeline is associated with the upper part of the releasing; the pressure measuring device is sent to a preset position through a drill rod, and an orifice fixing and blowout preventing device is arranged at the orifice end of the drill hole;
s4: the pressure measuring device is fixed, the rear end of the drill rod is connected with a high-pressure water braid, and pumping and pressurizing are started after the fact that all parts of the pumping and pressurizing system are well connected is confirmed; high-pressure water enters the pressure measuring device along the drill rod, so that a rubber sleeve type packer in the pressure measuring device is inflated; stopping pumping when the water injection pressure of the hole opening of the drill hole reaches a preset value, completing preliminary fixing by the pressure measuring device, and forming a grouting chamber and a pressure measuring chamber between the pressure measuring device and the drill hole;
s5: separating the drill rod, opening the high-pressure water braid, throwing the plugging balls into the drill rod, and closing the high-pressure water braid; pumping and pressurizing, and conveying the plugging ball into a plugging ball seat in the release, so as to seal the drill rod; continuously pressurizing until the pressure shears the shear pin in the release, and separating the pressure measuring device from the drill rod;
s6: the pipeline is unfolded and exits the drill rod, and the pressure measuring pipeline and the grouting pipeline of the preset pipeline are dragged and paved in the drill hole due to the fact that the pressure measuring pipeline and the grouting pipeline are connected with the tail end of the drill rod;
s7: grouting reinforcement, connecting a grouting pipeline with a grouting system, and filling a hole sealing material tank into a grouting chamber;
s8: and (3) measuring pressure, connecting a pressure measuring pipeline with a measuring instrument, and then reading the underground gas pressure measurement value.
Preferably, in the step S7, the grouting pressure stabilizing value of the grouting system should be higher than the expected gas pressure.
Preferably, in the step S8, when the active pressure measurement method is adopted, the pressure measurement line is injected with an inert gas.
Compared with the prior art, the application has the following effects:
1. the gas pressure measuring device is conveyed to the deep hole terminal by using the drilling machine and the drill rod, so that the fixed-point gas pressure measurement of the long drilling hole is realized;
2. the hole sealing section is positioned in an area without pressure relief at the tail end of the long drilling hole, and the gas pressure measured value is closer to the in-situ true value of the coal stratum; the 'two-plug one-injection' type hole sealing device is adopted to realize accurate positioning, quick and tight hole sealing; the pressure measuring chamber has smaller space and quick recovery of gas pressure;
3. after the gas pressure measurement of the long drilling hole is finished, the drilling hole can be continuously subjected to reinforced reflection enhancement, gas extraction and the like, so that one-hole multi-purpose is realized.
Drawings
FIG. 1 is a block diagram of a pressure measurement device in an embodiment of the application;
FIG. 2 is a block diagram of a release in an embodiment of the application;
FIG. 3 is a state diagram of the loading phase of the pressure measuring device according to the embodiment of the present application;
FIG. 4 is a state diagram of a measuring stage of the pressure measuring device according to an embodiment of the present application;
FIG. 5 is a flow chart of a method of measuring pressure in an embodiment of the application.
Reference numerals
1-a pressure measuring chamber; 2-a screen pipe; 3-packing element type packer; 4-grouting room; 5-presetting a pipeline; 6-releasing; 7-a drill rod; 8-drilling holes; 9-hole sealing materials; 10-pressure measurement line; 11-grouting pipeline; 12-orifice fixation and blowout preventer; 13-shearing pins; 14-a high pressure chamber; 16-water hole; 17-a plugging ball; 18-a one-way valve; 19-a support ring; 21-grouting outlet; 22-plugging ball seat.
Detailed Description
The technical scheme of the application is further described below with reference to the accompanying drawings and examples.
The device for measuring the gas pressure by using the underground long drilling holes comprises a protective pipe body, wherein the tail end of the protective pipe body is communicated with a screen pipe 2, a plurality of air holes are formed in the screen pipe 2, and the screen pipe 2 is communicated with a pressure measuring chamber 1 through the air holes.
The upper end of the protection pipe body is fixed on a drill rod 7 through a releasing device 6. Specifically, the release 6 includes an upper portion and a lower portion, with a high pressure chamber 14 disposed therebetween. The upper part of the release 6 is fixed on the drill rod 7, and the lower part of the release 6 is fixed on the protective pipe body. The upper part of the release 6 is provided with a plugging ball seat 22, and the plugging ball seat 22 is fixed with the lower part through a shear pin 13. The shutoff ball seat 22 communicates with the high pressure chamber 14 through the port 16.
The two ends of the outer side of the protection tube body are provided with rubber barrel type packers 3, and the rubber barrel type packers 3 are communicated with the inner part of the protection tube body through one-way valves 18. During operation, the rubber cylinder is expanded, so that the two ends of the protection pipe body are fixed with the drilling holes 8. A grouting outlet 21 is arranged on the protection pipe body between the rubber barrel type packers 3, and the hole sealing material 9 enters a sealed space formed by the drilling holes 8 and the rubber barrel type packers 3 through the grouting outlet 21.
A flexible preset pipeline 5 is arranged in the protective tube body, and the preset pipeline 5 is wound on an inner rod of the protective tube body. The prearranged pipeline 5 comprises a pressure measuring pipeline 10 and a grouting pipeline 11, wherein the tail end of the pressure measuring pipeline 10 is fixed inside the screen pipe 2, and the tail end of the grouting pipeline 11 is fixed on a grouting outlet 21. To prevent the pre-set lines 5 from being entangled with each other, the pressure line 10 and the grouting line 11 are separated by a support ring 19, the support ring 19 being fixed to the middle of the inner rod. The pressure measuring pipeline 10 is wound on one end of the inner rod close to the sieve tube 2, and the grouting pipeline 11 is wound on one end of the inner rod close to the release 6.
Based on the pressure measuring device, the application also provides a pressure measuring method, which comprises the following steps:
s1: parameters such as the aperture, the hole depth, the hole sealing position and the like of the drilling hole 8 and the drilling track are designed according to the geological characteristics of the region, the gas pressure measurement purpose, the size of a gas pressure measurement device and the like, and the drilling hole 8 should be kept straight as far as possible, so that branch holes are prevented from being opened as far as possible;
s2: adopting directional long drilling 8 drilling equipment, constructing a pressure measuring drilling 8 strictly according to design parameters, accurately measuring the track of the drilling 8, adopting correction measures when necessary, flushing drill cuttings in the drilling to the design depth, and exiting all drill rods 7;
s3: connecting a pressure measuring device to the forefront end of the drill rod 7, sequentially connecting the drill rod 7 to send the pressure measuring device to a preset position, and installing an orifice fixing and blowout preventing device 12 at the orifice end of the drill hole 8;
s4: the rear end of the drill rod 7 is connected with a high-pressure water braid, the pumping is started after the connection of all components of a pumping pressure system is confirmed, high-pressure water enters the double-end rubber-barrel packer 3 of the pressure measuring device along the drill rod 7, the rubber barrel is expanded when the high-pressure water enters the inside of the rubber-barrel packer 3 through the one-way valve 18, the pumping is stopped when the water injection pressure of an orifice reaches a preset value (the water injection pressure is higher than the grouting pressure), the pressure measuring device completes primary fixation, and a grouting chamber 4 and a pressure measuring chamber 1 are formed between the pressure measuring device and a drilling hole 8;
s5: the high-pressure water braid is detached, the plugging ball 17 is put into the drill rod 7, then the high-pressure water braid is closed, pumping and pressurizing are carried out, and accordingly the plugging ball 17 is fed into the plugging ball seat 22, and the drill rod 7 forms a closed space. High-pressure water enters the high-pressure cavity 14 from the water hole 16, and is continuously pressurized until the pressure shears the shear pin 13 in the release 6, and the pressure measuring device is separated from the drill rod 7;
s6: all drill rods 7 in the hole are withdrawn in sequence, and in the process of withdrawing the drill, a pressure measuring pipeline 10 and a grouting pipeline 11 preset in the pressure measuring device are dragged and laid in the whole hole section to the hole opening due to the traction with the ends of the drill rods 7;
s7: the grouting pipeline 11 is connected with a grouting system, and the grouting pressure stabilizing value is higher than the expected gas pressure; the hole sealing material 9 enters the grouting chamber 4 between the two packers through the grouting pipeline 11, so that the reinforcement and fixation of the pressure measuring device are realized;
s8: the pressure line 10 is connected to a pressure gauge and is fixed (inert gas may be injected from the pressure line 10 when active pressure measurement is used), after which the gas pressure measurement is read according to the relevant standard.
In summary, the device and the method for measuring the gas pressure of the underground long drilling hole of the coal mine with the structure ensure the rapid and tight hole sealing in the long drilling hole and improve the testing precision and the measuring depth of the gas pressure of the coal seam.
The foregoing is a specific embodiment of the present application, but the scope of the present application should not be limited thereto. Any changes or substitutions that would be obvious to one skilled in the art are deemed to be within the scope of the present application, and the scope is defined by the appended claims.
Claims (5)
1. The underground long-drilling gas pressure measuring device is characterized by comprising a protective pipe body, wherein the tail end of the protective pipe body is communicated with a screen pipe, a plurality of air holes are formed in the screen pipe, and the screen pipe is communicated with a pressure measuring chamber through the air holes; the front end of the protective pipe body is fixed on the drill rod through releasing;
the two ends of the outer side of the protection pipe body are provided with rubber barrel type packers, the rubber barrel type packers are communicated with the inner part of the protection pipe body through one-way valves, and grouting outlets are arranged on the protection pipe body between the rubber barrel type packers;
a flexible preset pipeline is arranged in the protective pipe body, and the preset pipeline is wound on an inner rod of the protective pipe body; the preset pipeline comprises a pressure measuring pipeline and a grouting pipeline, the tail end of the pressure measuring pipeline is fixed inside the screen pipe, and the tail end of the grouting pipeline is fixed on the grouting outlet.
2. The downhole long hole gas pressure measurement device of claim 1, wherein a support ring is provided in the middle of the inner rod, the support ring separating the pressure measurement line from the grouting pipe section; the pressure measuring pipeline is wound at one end of the inner rod, which is close to the sieve tube, and the grouting pipeline is wound at one end of the inner rod, which is close to the releasing device.
3. A method for measuring pressure of downhole long-drilled gas, comprising the following steps:
s1: drilling design, namely designing drilling aperture, hole depth, hole sealing position and drilling track parameters according to regional geological features, gas pressure measurement purposes and gas pressure measurement device dimensions;
s2: drilling construction, namely drilling construction is carried out according to the drilling design, and drilling is carried out to a designed depth, and drilling cuttings in the drilling are washed cleanly and exit the drill rod;
s3: the pressure measuring device is fed in, the pressure measuring device is fixed at the bottom of the drill rod through releasing, and the upper end of the threshold pipeline is associated with the upper part of the releasing; the pressure measuring device is sent to a preset position through a drill rod, and an orifice fixing and blowout preventing device is arranged at the orifice end of the drill hole;
s4: the pressure measuring device is fixed, the rear end of the drill rod is connected with a high-pressure water braid, and pumping and pressurizing are started after the fact that all parts of the pumping and pressurizing system are well connected is confirmed; high-pressure water enters the pressure measuring device along the drill rod, so that a rubber sleeve type packer in the pressure measuring device is inflated; stopping pumping when the water injection pressure of the hole opening of the drill hole reaches a preset value, completing preliminary fixing by the pressure measuring device, and forming a grouting chamber and a pressure measuring chamber between the pressure measuring device and the drill hole;
s5: separating the drill rod, opening the high-pressure water braid, throwing the plugging balls into the drill rod, and closing the high-pressure water braid; pumping and pressurizing, and conveying the plugging ball into a plugging ball seat in the release, so as to seal the drill rod; continuously pressurizing until the pressure shears the shear pin in the release, and separating the pressure measuring device from the drill rod;
s6: the pipeline is unfolded and exits the drill rod, and the pressure measuring pipeline and the grouting pipeline of the preset pipeline are dragged and paved in the drill hole due to the fact that the pressure measuring pipeline and the grouting pipeline are connected with the tail end of the drill rod;
s7: grouting reinforcement, connecting a grouting pipeline with a grouting system, and filling a hole sealing material tank into a grouting chamber;
s8: and (3) measuring pressure, connecting a pressure measuring pipeline with a measuring instrument, and then reading the underground gas pressure measurement value.
4. A downhole long borehole gas manometry method according to claim 3, wherein in step S7, the grouting pressure stabilizing value of the grouting system is higher than the expected gas pressure.
5. The method of downhole long borehole gas pressure measurement according to claim 4, wherein in step S8, inert gas is injected into the pressure measurement line when active pressure measurement is employed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110491201.6A CN113107469B (en) | 2021-05-06 | 2021-05-06 | Device and method for measuring gas pressure through underground long drilling |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110491201.6A CN113107469B (en) | 2021-05-06 | 2021-05-06 | Device and method for measuring gas pressure through underground long drilling |
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| CN113107469A CN113107469A (en) | 2021-07-13 |
| CN113107469B true CN113107469B (en) | 2023-11-17 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109184672B (en) * | 2018-11-14 | 2022-03-22 | 中煤科工集团重庆研究院有限公司 | Coal seam depression angle drilling gas pressure measuring device and pressure measuring method |
| CN114396254B (en) * | 2021-12-10 | 2023-09-26 | 煤炭科学技术研究院有限公司 | Auxiliary device for coal bed gas piezometer tube and use method |
| CN116971733B (en) * | 2023-09-22 | 2023-12-12 | 中国矿业大学 | Probing and injecting integrated machine tool and process suitable for tunneling under complex geological conditions |
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