CN106194161A - A kind of based on freezing to block the method that rock mass high pressure crevice water measures coal-bed gas pressure - Google Patents
A kind of based on freezing to block the method that rock mass high pressure crevice water measures coal-bed gas pressure Download PDFInfo
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- CN106194161A CN106194161A CN201610720482.7A CN201610720482A CN106194161A CN 106194161 A CN106194161 A CN 106194161A CN 201610720482 A CN201610720482 A CN 201610720482A CN 106194161 A CN106194161 A CN 106194161A
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- 230000008014 freezing Effects 0.000 title claims abstract description 42
- 238000007710 freezing Methods 0.000 title claims abstract description 42
- 239000011435 rock Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 33
- 241000372132 Hydrometridae Species 0.000 title claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 59
- 238000009530 blood pressure measurement Methods 0.000 claims abstract description 35
- 239000003245 coal Substances 0.000 claims abstract description 28
- 238000010276 construction Methods 0.000 claims abstract description 11
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 239000011780 sodium chloride Substances 0.000 claims abstract description 5
- 238000012360 testing method Methods 0.000 claims description 7
- 239000002775 capsule Substances 0.000 claims description 4
- 210000003097 mucus Anatomy 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 4
- 238000009795 derivation Methods 0.000 claims description 3
- 230000035800 maturation Effects 0.000 claims description 3
- 239000003643 water by type Substances 0.000 abstract description 4
- 238000005057 refrigeration Methods 0.000 abstract description 3
- 230000002631 hypothermal effect Effects 0.000 abstract description 2
- 238000005065 mining Methods 0.000 abstract description 2
- 230000000149 penetrating effect Effects 0.000 abstract description 2
- 239000000126 substance Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000003306 harvesting Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 239000011083 cement mortar Substances 0.000 description 3
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 208000032544 Cicatrix Diseases 0.000 description 1
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 231100000241 scar Toxicity 0.000 description 1
- 230000037387 scars Effects 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- 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
- E21B47/06—Measuring temperature or pressure
-
- 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
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
Landscapes
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
A kind of based on freezing to block the method that rock mass high pressure crevice water measures coal-bed gas pressure, solve rock stratum coal seam pushed up, base plate is aqueous, owing to being caused the situations such as the rock stratum of the through Seam Roof And Floor of crevice water by mining influence, during measuring coal-bed gas pressure, due to the interference of these rock stratum mesohigh crevice waters, cause the indeterminable problem of gas pressure.It is characterized in that: first step construction freezing borehole；Second step freezes to block crevice water；3rd step is constructed pressure measuring drill hole and is carried out pressure measurement；4th step conversion pressure.Under present invention low temperature, the method for water easy freezing blocks crevice water；In freezing hole, the hypothermic saline of circulation is injected with high-power refrigeration plant；After penetrating into a large amount of crevice waters in boring, the most frozen, extend with freeze-off time, water in boring surrounding rock body is gradually frozen into ice, it is the most frozen that crevice water at a distance runs into frozen crust when pressure tap seepage flow, gas pressure measuring chamber cannot be penetrated into, it is to avoid the interference of hydraulic pressure, accurately determine the gas pressure in coal seam.
Description
Technical field
The present invention relates to coal mine gas hazard management and gas utilizes field.Specifically disclose one and utilize freezing method
Block with tested Seam Roof And Floor at high pressure crevice water in rock mass, accurately determine coal-bed gas pressure and content thereof with this
New method.
Background technology
Coal-bed gas is first killer in colliery, is also a kind of clean energy resource simultaneously, the quasi-coal-bed gas pressure of accurate survey
And content is the important evidence instructing coal-bed gas to administer and utilize.But ocurrence of coal seam environment is extremely complex, coal seam is pushed up
Floor rock exists substantial amounts of crack and water, when measuring coal-bed gas pressure, bigger quiet in Seam Roof And Floor rock mass
Under effect of water pressure, start seepage flow in gas pressure measurement is holed.Because the interference of high pressure ground water, measure coal-bed gas pressure
Power is the most inaccurate, therefore, it is difficult to judge that coal-bed gas pressure size and gas bearing capacity are how many, this coal-bed gas is administered and
Utilize and produce interference, even can mislead safety in production, cause the major disasters such as gas explosion.Therefore coal-bed gas pressure one is measured
The individual most important interference getting rid of water pressure exactly, the most just can measure coal-bed gas pressure and content thereof accurately.
In order to solve the interference of water, common treatment measures are: inject water under high pressure in gas drilling surrounding rock body to measuring
Mud, carrys out blocking high-pressure crevice water with this.The most simply enumerate some conventional methods measuring gas pressures: (1) quickly pressure measurement
Method capsule blocks mode with mucus；(2) two block up a cementing plugging method；(3) polyurethane+grout off method；(4) yellow
Mud, rubber ring plugging method etc..In these methods, majority is to take measures in boring, blocks higher gas pressure with this.
Above (1), (2), (3) three kinds of methods be exactly the method using high pressure water injection mud to block crevice water, and the 4th kind of method is just
Being the mode not taking water blockoff, certainly, for not water-bearing stratum, this method is feasible.
During tunnelling, generally there is bigger deformation in country rock, produce substantial amounts of crack, by constructing for many years
Experience, uses cement mortar to carry out blocking high-pressure crevice water, is sometimes impracticable, because the hole of the Seed harvest after cement slurry sets
Gap rate is higher, i.e. coefficient of permeability is big, and under higher water pressure, water under high pressure extremely easily infiltrates into gas surveying air chamber.Work as gas
Measuring in air chamber and summarize existing gas, have again water under high pressure, that will imply that gas pressure measurement works unsuccessfully, the generation paid
Valency is sufficiently expensive.
Summary of the invention
The main object of the present invention is the rock stratum solving to push up for coal seam, base plate is aqueous, owing to being led by mining influence
The situations such as the rock stratum of the cause through Seam Roof And Floor of crevice water, during measuring coal-bed gas pressure, due to high in these rock stratum
The interference of pressure crevice water, causes the indeterminable problem of gas pressure, it is provided that a kind of based on freezing to block the survey of rock mass high pressure crevice water
The method determining coal-bed gas pressure.The present invention provides and measures the whole method of gas pressure and calculate theoretical process.
In order to realize foregoing invention purpose, the technical solution used in the present invention is as follows:
The first step, freezing borehole of constructing
Gas pressure measurement point is chosen in the top board or floor strata of prediction coal-bed gas pressure, with this point as the center of circle,
In rock stratum, construction radius is a series of freezing holes being perpendicular to coal seam of 1-2m, and ordinary circumstance is 8-12 hole, and these bore
Coal seam can not be passed through in hole, after seeing coal seam.
Second step, freezes to block crevice water
Utilize powerful freezing equipment, first seal up freezing hole, then inject cold cycle to each freezing hole
Saline, in hole and when there is freezing ice body near aperture, then inline freezing 1-2 days so that in the rock around pressure measuring drill hole
Crevice water the most frozen, and then coal body and the rock mass in the gamut near pressure tap is the most frozen, thus effectively
Crevice water around is played effective closure.
3rd step, pressure measuring drill hole of constructing, carry out pressure measurement
After freezing borehole freeze-stable 1-2 days, then carry out the construction of pressure measuring drill hole.Drill into coal body 0.5-1m deep
Degree, then use traditional quick manometry, as capsule+mucus method measures coal-bed gas pressure.
4th step, conversion pressure
Due to the quick pressure testing method of tradition, it is also desirable to after gas adsorption balance, pressure stability, just can stop test,
It is thus desirable to several days time.Again because freezing to make the coal temperature at pressure measurement reduce, measure under this temperature environment
There is larger difference in the pressure under gas pressure and actual environment, so needing the theory by existing maturation, counter pushes away actual rings
Gas pressure at a temperature of border.Thus need to measure temperature variations during coal bed pressure measurement, according to gas pressure and temperature
Degree functional relationship, the coal-bed gas pressure at a temperature of derivation actual environment.
Compared with prior art, the invention has the beneficial effects as follows:
1, there is greatest differences in the material of closure crevice water
The method of the closure crevice water that tradition is conventional, majority is chemical method, i.e. uses and injects height in pressure tap
Compressed water slurry or chemical grout, solidify or after consolidation until cement mortar or chemical pulp, by roof or floor strata (this survey to be seen
Amount position and determine top, base plate position) in fracture seepage passage plugging, block crevice water enter measure gas pressure hole
Air chamber content, thus ensure the accuracy of the force value measured.But due to pressure measurement position rock crack with artesian water
Rock crack link up mutually, under huge seepage pressure effect so that the Seed harvest of rock stratum, cement mortar or chemical pulp, it is impossible to resistance
Only crevice water seepage flow in pressure measurement air chamber so that pressure measurement works unsuccessfully.
Patent of the present invention uses freezing process closure rock crack water conservancy project skill, is physical method, and i.e. under low temperature, water easily condenses
The character becoming solid-state ice body realizes blocking crevice water.Utilize high-power refrigeration plant, inject the low of circulation to freezing hole content
Warm saline, after penetrating into a large amount of crevice waters in boring, the most frozen, along with the prolongation of freeze-off time, boring rock mass around
In moisture also condense into ice body, close after dog collar, owing to the hole of ice body is the least when several freezing holes are formed
In cement Seed harvest, so this plugging effect is much better, and crevice water at a distance is when pressure tap seepage flow, runs into and freezes
Circle, the most frozen immediately, therefore the scope of frozen crust is increasing, until pressure measurement is complete.
Simultaneously because the water come from pressure tap seepage flow at a distance is frozen, thus complete block crevice water to pressure tap
Seepage flow, the result at this moment measured is entirely accurate.
And the method for chemical grouting, it is impossible to stop the seepage flow of water under high pressure, owing to the pressure measurement time is longer, three or five days at least, many
Then one week, two time-of-weeks, therefore long water under high pressure seepage flow, causes pressure measurement air chamber to be full of crevice water, thus causes pressure measurement to be lost
Lose.
2, closure scope can control
Conventional chemical grouting method, majority is to surrounding rock body slip casting in pressure tap, and therefore range of grouting cannot ensure,
And use scars logos, can the scope of control freezing rock stratum and the degree of depth the most freely, thus ensure to block crevice water
Effect.
3, the closure circle of crevice water can increase along with the prolongation of freeze-off time
Chemical method water blockoff, owing to rock and Seed harvest exist certain porosity, crevice water around can be gradually to survey
Plenum chamber carries out seepage flow, and therefore closure circle can reduce along with the increase of pressure measurement time, and so, long pressure measurement can cause surveying
Plenum chamber seepage flow enters substantial amounts of water, thus causes test crash.And freezing process closure crevice water, can prolongation over time and by
Cumulative cold gradually spreads to surrounding rock mass so that the scope of freeze water gradually expands greatly, and the water that seepage flow comes at a distance,
Also the cold that can be come by continued conduction freezes, thus defines large range of closure circle, and around crack aquiform stool cannot be introduced into
Pressure measurement air chamber, thus in ensure that air chamber, only have the existence of methane gas.
4, pressure measurement value will be corresponding with under ambient temperature force value convert
It is known that coal temperature is the lowest, the content of its adsorption gas is the highest, and gas pressure is the lowest, because freezing
Technique reduces coal temperature in the range of pressure measurement so that gas pressure herein exists bigger difference with the force value under ambient temperature
Different, it is therefore desirable to carry out different temperatures downforce conversion by ripe theory.The force value that this problem obtains, is relatively as the criterion
Really.
Detailed description of the invention
Below in conjunction with specific embodiment, the foregoing invention content of the present invention is described in further detail.
But this should not being interpreted as, the scope of the above-mentioned theme of the present invention is only limitted to following embodiment.Without departing from the present invention
In the case of stating technological thought, according to ordinary skill knowledge and customary means, make various replacement and change, all should include
Within the scope of the invention.
Embodiment
First, according to requirement on the concrete coal-bed gas given on ore deposit, hydrogeologic data, and ore deposit, select suitably
Point, suitable equipment, technique carry out gas pressure measurement.The rock stratum containing a large amount of crevice waters is avoided in pressure measurement place, by advance
First punch detection, find that boring water percolating capacity is relatively big, just abandon herein as pressure measurement place, select separately to implement elsewhere to survey
Pressure.Reason is the increase that a large amount of crevice water can cause difficulty of construction, and the loss of refrigerating capacity is the biggest, also results in pressure measurement simultaneously
Failure.
Secondly, selection crushing rock formation the to be avoided region in pressure measurement place, because these regions can be because freezing to cause rock stratum
Come off, workmen is caused certain injury.
3rd, if finding, pressure measurement place does not has crevice water, and tunnel is more complete, and this is can not to use to freeze to block crack
Water conservancy project skill, directly uses conventional method to carry out pressure measurement.
The selection in concrete pressure measurement place, the basic demand to production on the most with good grounds ore deposit, and concrete geological environment
Judge the selection of technique.
The first step, selects job location, determines construction parameter
Either in floor strata, still arrange pressure tap, freezing hole at top board, be intended to the brill that construction drill amount is minimum
Hole.First determine the parameters such as the orifice position of pressure tap, bore direction angle, the degree of depth, then with aperture as the center of circle, execute in rock stratum
Work radius is the series of parallel in the freezing borehole of pressure tap of 1-2m.Boring is determined according to the situation such as rock stratum, plant capacity
Construction quantity.Freezing borehole diameter is about 60mm, a diameter of 50mm of pressure tap, and freezing hole can not pass through coal seam, and surveys
Pressure coal seam to be entered, the hole 0.5m degree of depth.
Second step, opens and freezes to block crevice water technique, observe and freeze situation, it is then determined that the enforcement of next step pressure tap
The enforcement of scheme
Select to be suitable for the high-power refrigeration machine of the explosion-proof type in colliery and supporting plugging equipment.First freezing hole is sealed up, so
Each freezing hole backward injects hypothermic saline, in hole and when there is freezing ice body near aperture, then inline freezing 1-2 days,
Make the crevice water in the rock around pressure measuring drill hole the most frozen, the coal body in judging the gamut near pressure tap
After the most frozen with rock mass, if effectively crevice water around is played effective closure, the construction of pressure tap can be implemented.
3rd step, pressure measuring drill hole of constructing, pressure instrumentataion is installed and carries out gas pressure measurement
Construction pressure measuring drill hole, after drilling into the coal body 0.5-1m degree of depth, stops creeping into, withdraws from rig；Install and pass
The quick pressure instrumentataion of system, such as capsule+mucus method, puts into pressure measuring drill hole by mounted equipment, other steps and conventional measurement
Press identical, tire out the most one by one and state.
4th step, measures actual temperature in pressure tap, carries out the conversion of gas pressure according to law between temperature
Due to the quick pressure testing method of tradition, also need, after gas adsorption balance, pressure stability, just to stop test, therefore
Need several days time.Again because freezing to make the coal temperature at pressure measurement reduce, the gas measured under this temperature environment
There is larger difference in the pressure under pressure and actual environment, so needing the theory by existing maturation, counter pushes away actual environment temperature
Gas pressure under Du.Thus need to measure temperature variations during coal bed pressure measurement, according to gas pressure and temperature letter
Number relation, the coal-bed gas pressure at a temperature of derivation actual environment.
Claims (1)
1. one kind based on freeze block rock mass high pressure crevice water measure coal-bed gas pressure method, it is characterised in that:
The first step, freezing borehole of constructing
Gas pressure measurement point is chosen, with this point as the center of circle, at rock in the top board or floor strata of prediction coal-bed gas pressure
In Ceng, construction radius is a series of freezing holes being perpendicular to coal seam of 1-2m, is set to 8-12 hole, and these borings can not be passed through
Coal seam, after seeing coal seam；
Second step, freezes to block crevice water
Utilize powerful freezing equipment, first seal up freezing hole, then inject cold cycle saline to each freezing hole,
In hole and when there is freezing ice body near aperture, then inline freezing 1-2 days so that the crack in rock around pressure measuring drill hole
Water is the most frozen, and then coal body and the rock mass in the gamut near pressure tap is the most frozen；
3rd step, pressure measuring drill hole of constructing, carry out pressure measurement
After freezing borehole freeze-stable 1-2 days, then carry out the construction of pressure measuring drill hole, drill into the coal body 0.5-1m degree of depth, then
Use traditional quick manometry, as capsule+mucus method measures coal-bed gas pressure；
4th step, conversion pressure
Due to the quick pressure testing method of tradition, it is also desirable to after gas adsorption balance, pressure stability, test just can be stopped, therefore
Need several days time；Again because freezing to make the coal temperature at pressure measurement reduce, the gas measured under this temperature environment
There is larger difference in the pressure under pressure and actual environment, so needing the theory by existing maturation, counter pushes away actual environment temperature
Gas pressure under Du；Thus need to measure temperature variations during coal bed pressure measurement, according to gas pressure and temperature letter
Number relation, the coal-bed gas pressure at a temperature of derivation actual environment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610720482.7A CN106194161A (en) | 2016-08-17 | 2016-08-17 | A kind of based on freezing to block the method that rock mass high pressure crevice water measures coal-bed gas pressure |
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| CN201610720482.7A CN106194161A (en) | 2016-08-17 | 2016-08-17 | A kind of based on freezing to block the method that rock mass high pressure crevice water measures coal-bed gas pressure |
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Cited By (5)
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| CN107085085A (en) * | 2017-03-06 | 2017-08-22 | 安徽理工大学 | Hydro-thermal power THM coupling manual pipe jacking disturbed soil grouting test device and method |
| CN110513100A (en) * | 2019-09-11 | 2019-11-29 | 华北科技学院 | A kind of field experiment method improving gas pressure measurement success rate |
| CN113586022A (en) * | 2021-06-04 | 2021-11-02 | 广州海洋地质调查局 | Method and device for increasing production and improving natural gas hydrate reservoir by freezing and fracturing |
| CN114320219A (en) * | 2021-12-22 | 2022-04-12 | 重庆交通大学 | Karst borehole fracture water rapid plugging device and method |
| CN116678802A (en) * | 2023-08-03 | 2023-09-01 | 常州市建筑材料研究所有限公司 | Prefabricated inspection well impermeability detection device and detection method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107085085A (en) * | 2017-03-06 | 2017-08-22 | 安徽理工大学 | Hydro-thermal power THM coupling manual pipe jacking disturbed soil grouting test device and method |
| CN107085085B (en) * | 2017-03-06 | 2018-04-17 | 安徽理工大学 | Hydro-thermal power THM coupling manual pipe jacking disturbed soil grouting test device and method |
| CN110513100A (en) * | 2019-09-11 | 2019-11-29 | 华北科技学院 | A kind of field experiment method improving gas pressure measurement success rate |
| CN110513100B (en) * | 2019-09-11 | 2023-04-07 | 华北科技学院 | On-site experiment method for improving gas pressure measurement success rate |
| CN113586022A (en) * | 2021-06-04 | 2021-11-02 | 广州海洋地质调查局 | Method and device for increasing production and improving natural gas hydrate reservoir by freezing and fracturing |
| CN113586022B (en) * | 2021-06-04 | 2023-06-27 | 广州海洋地质调查局 | Method and device for improving yield of natural gas hydrate reservoir through freezing fracturing |
| CN114320219A (en) * | 2021-12-22 | 2022-04-12 | 重庆交通大学 | Karst borehole fracture water rapid plugging device and method |
| CN116678802A (en) * | 2023-08-03 | 2023-09-01 | 常州市建筑材料研究所有限公司 | Prefabricated inspection well impermeability detection device and detection method thereof |
| CN116678802B (en) * | 2023-08-03 | 2023-11-14 | 常州市建筑材料研究所有限公司 | Prefabricated inspection well impermeability detection device and detection method thereof |
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