CN101824999A - Technology for measuring gas pressure of coal bed by utilizing through beds hole - Google Patents
Technology for measuring gas pressure of coal bed by utilizing through beds hole Download PDFInfo
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- CN101824999A CN101824999A CN200910119144A CN200910119144A CN101824999A CN 101824999 A CN101824999 A CN 101824999A CN 200910119144 A CN200910119144 A CN 200910119144A CN 200910119144 A CN200910119144 A CN 200910119144A CN 101824999 A CN101824999 A CN 101824999A
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Abstract
The invention relates to a technology for measuring the gas pressure of a coal bed by utilizing a through beds hole. The technology solves the problems of rough hole walls of the through beds, drill hole deformation, high risk of hole collapse and the like, and can seal a detection hole tightly and obtain true and reliable measured gas pressure value. The technology completes the construction of the detection hole by adopting a method of hole drilling, cement paste hole sealing and hole cleaning, which guarantees the stability of the detection hole during measuring the pressure. The detection hole is sealed by using a double-capsule hole sealing system to prevent gas leakage. The invention can be applied to the measurement of the gas pressure of the coal bed and the pressure of various gases in rock stratums by utilizing the through beds hole under coal mines.
Description
One, technical field
The present invention relates to a kind of technology of utilizing measuring gas pressure of coal bed by utilizing through beds hole, be applicable to the mensuration of coal-bed gas pressure under the various geological conditionss in colliery.
Two, background technology
Safety regulations in coal mine requires will carry out the detection of gas pressure before seam mining, composes the situation of depositing for understanding coal-bed gas, estimates colliery exploitation condition, determines that the development and use of safety of coal mines measure and gas provide foundation.Before detecting gas pressure, will beat detected coal seam earlier and detect the hole, detect the hole and be divided into along layer hole and wear a layer hole, it is generally longer to wear layer hole, can reach more than the 40m.Wear layer hole built on the sand because the stress effect of hole wall periphery makes, the hole of very easily collapsing influences the mensuration of gas pressure.When the method that directly the drilling of extensive use at present utilizes the capsule sealing of hole to measure coal-bed gas pressure is applied to wear the pressure measurement of layer hole, because the coarse injustice of drill hole wall, wearing a layer hole during the pressure measurement deforms even collapses the hole, the sealing of shutoff boring is affected, and the coal-bed gas pressure value of measuring can not the actual gas pressure value in actual response coal seam.The capsule of sealing of hole contacts with hole wall, and pressure measurement finishes the back and is difficult to capsule is extracted out, and the capsule after the extraction also damages to some extent and causes reduce greatly application life.
Three, technology contents
1. goal of the invention
At above for the existing problem of utilizing technology for measuring gas pressure of coal bed by utilizing through beds hole to exist, the purpose of this invention is to provide a kind of can be in the pressure measurement process, the construction technology in the detection hole of the steadiness in layer hole and sealing is worn in assurance, and shutoff detects the method that gas pressure is measured in the hole.Avoid the collapsing generation in hole makes the gas pressure value of mensuration true and reliable, and increases the access times of capsule simultaneously, reduces the cost of sealing of hole pressure measurement greatly.
2. technical scheme
The present invention adopts the method for boring-cement paste sealing of hole-cleaning bottom of hole, promptly punches and extends boring 0.2m behind layer hole exposed coal, at the aperture mounting flange, uses carrier pipe to inject cement paste to the end face of holing in the hole.After cement paste solidifies fully, use, extend behind the exposed coal about boring 2m, form the coal seam elongated hole than wearing the little drill bit cleaning bottom of hole of layer bore dia.Intensity was big after cement paste solidified, and can keep wearing the steadiness in layer hole.Cement boring and coal seam elongated hole adopt double-capsule shutoff mode, and promptly first capsule middle part places cement boring and coal seam elongated hole boundary, and capsule charges into expansion shutoff coal seam elongated hole behind the high-pressure emulsion, simultaneously to the cement boring formation first road shutoff.Second capsule links to each other with first capsule, is arranged in cement boring, forms the second road shutoff to cement boring.The pressure of emulsion that keeps charging into capsule is greater than gas pressure 0.5MPa, thereby prevents the leakage of coal-bed gas.The space of the first capsule end and coal seam elongated hole end face is as the gas chamber, the pressure measurement tube head is communicated with high-pressure air source outside wearing layer hole by the pipeline of capsule, to the tonifying Qi of gas chamber, when the pressure tabular value on being connected in high-pressure air source remains unchanged, be the gas pressure value of mensuration during pressure measurement.Problems such as this scheme has been avoided the direct shutoff of capsule to wear when gas pressure is measured in layer hole and worn a layer bore deformation, the hole of collapsing, the double-capsule plugging system is feasible to detect the hole sealing closely, efficiently solves existing problem of wearing in layer hole mensuration gas pressure process.
3. technique effect
This measuring gas pressure of coal bed by utilizing through beds hole method and apparatus has good sealing effect through the field trial test, and simple to operate, the damage of capsule is little, and the gas pressure value of mensuration is accurate, the low cost and other advantages that sealing of hole detects.Make things convenient for the loading and unloading in the less space under the coal mine, saved the time of pressure measurement.
Four, description of drawings
Fig. 1, Fig. 2 are that the present invention detects the hole construction method schematic diagram
Fig. 3 is shutoff of the present invention and pressure testing method schematic diagram
Five, the specific embodiment
Embodiment 1: as shown in Figure 1 and Figure 2, gas pressure of the present invention detects the job practices in hole, may further comprise the steps:
(1) adopts conventional boring method to punch a layer hole (1), extend boring 0.2m behind the exposed coal.In aperture fixed flange (4), cement paste carrier pipe (3) is extend near wearing a layer internal end surface place, hole, carrier pipe (3) connects cement injection machine (5).The cement injection machine injects cement in wearing layer hole, along with the filling of cement paste is constantly twitched carrier pipe (3) and avoided carrying tube head to imbed in the cement paste (2).Wear and establish a flexible pipe (6) tube head in layer hole and stretch out and wear a layer hole, be used to derive cement paste hollow G﹠W.
(2) after cement paste solidifies 24 hours, remove flange.Carry out cleaning bottom of hole with wearing the little drilling rod of layer bore dia (7), extend boring 2m-3m behind the exposed coal, finish the construction that detects the hole.
Embodiment 2: as shown in Figure 3, the method that shutoff of the present invention detects the hole pressure measurement is: with pillar (13) by being threaded on the joint of capsule (12) side, by pillar (13) capsule sealing of hole system is pushed in the hole, when pillar (13) the outer end pillar (14) that is spirally connected during near the aperture, connect some pillars with the same manner, capsule sealing of hole system is pushed detect in the hole.Make capsule (9) middle part be positioned at cement boring and coal seam elongated hole boundary, capsule (12) is arranged in cement boring.Pressure measurement tube head (8) is equipped with in capsule (9) end, draws a pressure measurement pipeline (10) from pressure measurement tube head (8) and is communicated with high-pressure air source (17) and pressure gauge (18).High-voltage tube (15) connects energy storage canister (21) and handlance (19), and as the pipeline of high-pressure emulsion injection capsule, capsule (9) is communicated with by pipeline (16) with capsule (12), and high-voltage tube (15) is communicated with two capsules.Operator press pump, emulsion enter energy storage canister (21) raises pressure, by pipeline (15), (16) thus inject and make its expansion shutoff detect the hole in the two capsules.Opening the high-pressure air source valve charges into pressure-air to the gas chamber and makes its pressure be higher than coal-bed gas pressure.The force value that shows when pressure gauge (18) is reduced to certain value and keeps more than 24 hours when constant, and this value is the actual value of coal-bed gas pressure.
Claims (4)
1. the technology of a measuring gas pressure of coal bed by utilizing through beds hole is characterized in that: this technology mainly comprises the method that the construction technology that detects the hole and shutoff detect the hole pressure measurement.
2. the technology of measuring gas pressure of coal bed by utilizing through beds hole according to claim 1 is characterized in that the construction sequence that detects the hole is:
(1) adopts conventional boring method to punch a layer hole (1), extend boring 0.2m behind the exposed coal.In aperture fixed flange (4), cement paste carrier pipe (3) is extend near wearing a layer internal end surface place, hole, carrier pipe (3) connects cement injection machine (5).The cement injection machine injects cement in wearing layer hole, along with the filling of cement paste is constantly twitched carrier pipe (3) outward and avoided carrying tube head to imbed in the cement paste (2).Wear and establish a flexible pipe (6) in layer hole, tube head stretches out wears a layer hole, is used to derive cement paste hollow G﹠W.
(2) after cement paste solidifies 24 hours, remove flange (4).Carry out cleaning bottom of hole with wearing the little drill bit of layer bore dia (7), extend boring 2m-3m behind the exposed coal, finish the construction that detects the hole.
3. the technology of measuring gas pressure of coal bed by utilizing through beds hole according to claim 1, the method that it is characterized in that shutoff detection hole pressure measurement is: capsule sealing of hole system pushes by pillar (13) (14) and detects the hole, capsule (9) middle part is positioned at cement boring and coal seam elongated hole boundary, and capsule (12) is arranged in cement boring.Capsule (9), (12) communicate by screwed pipe (16), and the two capsules end connects by pipe (11).High-pressure hose (15) is communicated with energy storage canister (21) and high pressure manual pump (19), and high-pressure emulsion charges into two capsules inside by pipeline (15) and pipeline (16), capsule is expanded and shutoff detection hole.To gas chamber (20) tonifying Qi, the force value that shows when pressure gauge (18) is reduced to certain value and keeps more than 24 hours when constant high-pressure air source (17) by pipeline (10), and this value is the actual value of coal-bed gas pressure.
4. the technology of measuring gas pressure of coal bed by utilizing through beds hole according to claim 2 is characterized in that leaving two circular ports on the flange in shutoff aperture, so that cement paste carrier pipe and wireway stretch in the hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200910119144 CN101824999B (en) | 2009-03-04 | 2009-03-04 | Technology for measuring gas pressure of coal bed by utilizing through beds hole |
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| CN 200910119144 CN101824999B (en) | 2009-03-04 | 2009-03-04 | Technology for measuring gas pressure of coal bed by utilizing through beds hole |
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| CN101824999A true CN101824999A (en) | 2010-09-08 |
| CN101824999B CN101824999B (en) | 2013-02-20 |
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| CN102003173A (en) * | 2010-10-29 | 2011-04-06 | 北京中矿天安科技发展有限公司 | System and method for automatically measuring and recording gas pressure during coal seam hole sealing |
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| CN102410014A (en) * | 2011-10-31 | 2012-04-11 | 河南理工大学 | Method for testing pressure of gas in water-containing wall rock coal seam |
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| CN106894785A (en) * | 2017-03-10 | 2017-06-27 | 河南工程学院 | Easy gushing water coal seam upward hole gas pressure measurement method |
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| CN102410014B (en) * | 2011-10-31 | 2014-12-03 | 河南理工大学 | Method for testing pressure of gas in water-containing wall rock coal seam |
| CN102410014A (en) * | 2011-10-31 | 2012-04-11 | 河南理工大学 | Method for testing pressure of gas in water-containing wall rock coal seam |
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| CN105888723A (en) * | 2016-06-24 | 2016-08-24 | 安徽理工大学 | Drainage device and method for gas pressure measurement in downward cross hole drilling |
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| CN107542486B (en) * | 2017-09-30 | 2018-07-03 | 西安科技大学 | Drilling gas extraction laboratory simulation method and sealing material method for testing tightness |
| CN110219616A (en) * | 2019-06-19 | 2019-09-10 | 天地科技股份有限公司 | A kind of coal-bed gas pressure measuring device and its measurement method |
| CN111677495A (en) * | 2020-05-08 | 2020-09-18 | 中煤科工集团西安研究院有限公司 | Coal mine underground directional drilling gas measurement while drilling device, drilling tool and measurement method |
| CN111677495B (en) * | 2020-05-08 | 2023-08-15 | 中煤科工集团西安研究院有限公司 | Coal mine underground directional drilling while-drilling gas measuring device, drilling tool and measuring method |
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