CN109630087A - The molten leaching coal body fracturing permeability improvement device of liquid nitrogen and anti-reflection experimental method can be pressurized - Google Patents
The molten leaching coal body fracturing permeability improvement device of liquid nitrogen and anti-reflection experimental method can be pressurized Download PDFInfo
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- CN109630087A CN109630087A CN201910036857.1A CN201910036857A CN109630087A CN 109630087 A CN109630087 A CN 109630087A CN 201910036857 A CN201910036857 A CN 201910036857A CN 109630087 A CN109630087 A CN 109630087A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 216
- 239000003245 coal Substances 0.000 title claims abstract description 117
- 239000007788 liquid Substances 0.000 title claims abstract description 117
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 103
- 238000002474 experimental method Methods 0.000 title claims abstract description 48
- 238000002386 leaching Methods 0.000 title claims abstract description 20
- 230000035699 permeability Effects 0.000 title claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 92
- 238000004321 preservation Methods 0.000 claims abstract description 49
- 239000002184 metal Substances 0.000 claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 claims abstract description 22
- 238000001179 sorption measurement Methods 0.000 claims abstract description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 14
- 238000011161 development Methods 0.000 claims description 10
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 208000010392 Bone Fractures Diseases 0.000 claims description 6
- 206010017076 Fracture Diseases 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims 1
- 230000000694 effects Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000003317 industrial substance Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/28—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent
- E21B43/283—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent in association with a fracturing process
-
- 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- 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
-
- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (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)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses one kind can be pressurized the molten leaching coal seam with gas fracturing permeability improvement device of liquid nitrogen, including heat-preservation cylinder, is connected with inner cylinder downwards at heat-preservation cylinder roof center, has gap between inner cylinder bottom end and heat-preservation cylinder bottom wall；Pressure tight metal mesh sheet is horizontally installed in the middle part of inner cylinder, inner cylinder is divided into coal body chamber and admission chamber by pressure tight metal mesh sheet up and down；Isolating valve is installed, isolating valve is used to separate inner cylinder and its valve rod stretches out heat-preservation cylinder in the horizontal direction in the middle part of inner cylinder；The heat-preservation cylinder roof on inner cylinder top is threaded with inside drum cover, and inside drum cover is equipped with screw thread axis body；The invention also discloses anti-reflection experimental methods, the present invention can be carried out the molten leaching coal body experiment of the liquid nitrogen under coal body difference gas adsorption pressure condition, the specific size of the molten leaching coal body of liquid nitrogen can also preferably be controlled, anti-reflection experiment is carried out to coal body under varying experimental conditions suitable for repeated multiple times, be conducive to obtain optimal anti-reflection scheme, provide technical support for the exploitation utilization of coal bed gas.
Description
Technical field
The present invention relates to coal-bed gas exploitation fields, and in particular to technology that liquid nitrogen pressure break is anti-reflection.
Background technique
Coal bed gas, refer to preservation in coal seam using methane as main component, to be adsorbed on based on matrix of coal particle surface, portion
Divide the hydrocarbon gas for being free in coal hole or being dissolved in coal seam water, be the associated minerals resource of coal, belongs to Unconventional gas,
It is cleaning, high-grade energy and the industrial chemicals to emerge in the world in nearly ten or twenty year.Coal seam permeability is low, seriously affects extraction effect
Rate, presently, there are the rows of returning to lead the problems such as low, pressure-break is short, pollution environment for hydraulic fracturing, is to improve coal using novel fracturing technique
The key of layer fracturing effect has many advantages, such as that energization helps row, small to coal seam injury using cryogen pressure break coal seam reservoirs；Pre-
It is the prior art that the molten leaching coal body fracture development experiment of liquid nitrogen is carried out under the conditions of fixed temperature and under coal seam reservoirs pressure, but lacks experiment
With liquid nitrogen pressure break relevant apparatus, existing equipment can not achieve the anti-reflection experiment of coal containing methane gas liquid nitrogen cold soaking, can not achieve it is fixed or
The anti-reflection experiment of liquid nitrogen under loading environment can not also study pressure one and fix liquid nitrogen infiltration coal sample size to coal sample fracture development feelings
The influence of condition.
Summary of the invention
The molten leaching coal body fracturing permeability improvement device of liquid nitrogen can be pressurized the purpose of the present invention is to provide one kind, under the conditions of coal containing methane gas
The experiment of liquid nitrogen cold soaking and axial restraint, can easily control liquid nitrogen level, carry out low-temperature cracks development experiment to coal sample, and just
Repeat to test after changing level parameter and pressure parameter.
To achieve the above object, the molten leaching coal seam with gas fracturing permeability improvement device of liquid nitrogen that is pressurized of the invention includes open circles
Cylindrical heat-preservation cylinder, heat-preservation cylinder is vertically arranged, and heat-preservation cylinder axial ends is all closed, and connection is free downwards at heat-preservation cylinder roof center
The inner cylinder of heart cylinder has gap between inner cylinder bottom end and heat-preservation cylinder bottom wall；Pressure tight metal net is horizontally installed in the middle part of inner cylinder
Inner cylinder is divided into coal body chamber and admission chamber by piece, metal mesh sheet up and down；
Isolating valve is installed, isolating valve is located at below pressure tight metal mesh sheet and, isolating valve adjacent with pressure tight metal mesh sheet in the middle part of inner cylinder
For separating inner cylinder and its valve rod stretches out heat-preservation cylinder in the horizontal direction, the side wall of the valve rod and heat-preservation cylinder, which seals, to be cooperated；Pressure resistance
The mesh diameter of metal mesh sheet is 3mm ~ 7mm；
The heat-preservation cylinder roof on inner cylinder top is threaded with inside drum cover, and inside drum cover is equipped with the spiral shell for increasing coal body axial compressive force
Line axis body (is pressed by rotating shaft to coal body), and screw thread axis body lower end is equipped with pressure sensor, is additionally provided with and removes on inside drum cover
Miscellaneous gas stomata；Liquid nitrogen chamber is surrounded between inner cylinder and heat-preservation cylinder side wall, the heat-preservation cylinder roof on liquid nitrogen chamber top is equipped with for being passed through
First valve of liquid nitrogen.
The heat-preservation cylinder and inner cylinder are made of clear material, and inner cylinder wall outer surface is connected with and is made of clear material
Scale solid panel, scale solid panel up and down uniform intervals be equipped with horizontal scale line, two neighbouring horizontal scale lines it
Between be separated by 1 millimeter, 0 graduation mark is located at metal mesh sheet, and 0 graduation mark is carved with unit every 1 centimetre of end in graduation mark to online
For centimetre the Arabic numerals for being used to indicate liquid nitrogen height；Screw thread axis body lower end for increasing coal body axial compressive force is equipped with
Pressure sensor；Two sides are provided with stomata (guaranteeing that liquid nitrogen intracavity gas facilitates outlet after liquid nitrogen is added) at the top of inner cylinder admission chamber.
The invention also discloses use above-mentioned experiment to be carried out with that can be pressurized the molten leaching coal containing methane gas sample fracturing permeability improvement device of liquid nitrogen
Anti-reflection experimental method, sequentially include the following steps:
First step is sealing propertytest；
Second step is that coal body is added；
Third step is despumation gas；
Four steps is gas adsorption；
5th step is that liquid nitrogen is added；
6th step is coal body axial pressure；
7th step is the fracture development experiment of coal body to be carried out under the conditions of scheduled gas pressure condition and liquid nitrogen level, and make
Good experimental record；
Second to the 7th step is an experiment circulation；It include the liquid level height value and coal of the scheduled liquid nitrogen of N group in planning of experiments
Body pressure value, N are the natural number more than or equal to 1；
Every group of scheduled liquid nitrogen level height value and the corresponding experiment circulation of pressure value, repeat the second to the 6th step,
The liquid level height value and gas pressure value that one group of scheduled liquid nitrogen is used in each experiment circulation, until the N group in planning of experiments
After the corresponding experiment circulation of the liquid level height value and coal body pressure value of scheduled liquid nitrogen carries out, terminate all experimentss.
The first step concrete operations are: the stomata for excluding miscellaneous gas are closed, by the first valve and external high pressure nitrogen
The tracheae of gas cylinder is connected, and the tracheae of external high pressure nitrogen gas cylinder is connected with external high pressure nitrogen gas cylinder；Open first
Valve and isolating valve inject nitrogen into coal body chamber by high pressure nitrogen gas cylinder and the first valve, nitrogen by inner cylinder bottom end with
Gap between heat-preservation cylinder bottom wall enters admission chamber；When pressure gauge shows that the pressure in coal body chamber and admission chamber reaches predetermined value
When, close the first valve；If pressure reduction values are less than or equal to 0.01MPa after pressure maintaining 12 hours, continue second step；
If after pressure maintaining 12 hours pressure reduction values be greater than 0.01MPa, need to can be pressurized the semi-soluble leaching fracturing permeability improvement device of liquid nitrogen into
After the maintenance of row leakproofness, first step is re-started；
The second step concrete operations are: open inside drum cover, coal body is put into coal body chamber, then will removal of impurities gas stomata with it is external
Vacuum pump be connected.
The third step concrete operations are: closing isolating valve by the vacuum pump connecting with removal of impurities gas stomata and extract coal body
Intracavitary miscellaneous gas, until seeing that vacuum meter 14 shows that the intracavitary vacuum degree of coal body keeps stablizing in three minutes；
The four steps concrete operations are: removal of impurities gas stomata connect with the tracheae of external high pressure gas gas cylinder, it is external
The tracheae of high pressure gas gas cylinder is connect with pressure sensor, and pressure sensor is connected by tracheae with pressure reducing valve, and pressure reducing valve is logical
It crosses tracheae to connect with high pressure gas gas cylinder, closes the first valve and isolating valve, open high pressure gas gas cylinder, by controlling pressure reducing valve
Methane gas is injected to coal body chamber, the intracavitary gas pressure of coal body is controlled by the voltage sensor of coal body chamber, so that coal body is more preferable
Adsorption gas, the then coal when the endoceliac pressure sensor of coal is equal with the pressure sensor numerical value that high pressure gas gas cylinder connects
Body adsorption gas balance.
The 5th step concrete operations are: the first valve and isolating valve are opened, by the first valve and external liquid nitrogen pipe
Road is connected, and external liquid nitrogen pipeline is connected with external liquid nitrogen source, is added by liquid nitrogen pipeline and the first valve to liquid nitrogen is intracavitary
Enter liquid nitrogen, liquid nitrogen enters inner cylinder by the gap between inner cylinder and heat-preservation cylinder bottom wall from bottom to top, passes through admission chamber and pressure resistance gold
Enter coal sample chamber after belonging to the mesh of mesh sheet；
Staff observes the liquid nitrogen in coal body chamber by transparent heat-preservation cylinder and inner cylinder, according to the scale and number on scale plate
Obtain the accurate liquid level of liquid nitrogen；When the liquid level of liquid nitrogen, which is up to, tests scheduled height, closing isolating valve, (isolating valve has
Certain volume), stop second step；
The 6th step concrete operations are: applying axial pressure by the coal body in the inside cylinder of screw thread axis body on rotation inside drum cover
Power, the pressure predetermined value applied to control to coal body by the pressure sensor connected on screw thread axis body.
The present invention has the advantage that:
The present invention can not only study the low-temperature cracks development under the conditions of the molten leaching coal body of liquid nitrogen, but also can study the molten leaching of liquid nitrogen
Low-temperature cracks development under the conditions of coal seam with gas can also study the molten leaching coal seam with gas of liquid nitrogen simultaneously under the conditions of axial pressure
Coal body fracture development.
The configuration of the present invention is simple, it is easy to use, intuitively observed convenient for experimenter and control the liquid level of liquid nitrogen with
And the pressure value of gas.
Heat-preservation cylinder and inner cylinder and scale solid panel are made of clear material, and ensure that visuality of the invention, experiment
Personnel can intuitively and accurately observe the liquid level of liquid nitrogen.It can effective control gas pressure by observation pressure sensor.
Anti-reflection experimental method of the invention can easily control the liquid level of experimental pressure and liquid nitrogen, and be convenient for
The liquid level condition of different experimental pressure condition and different liquid nitrogen is provided, for low-temperature cracks development experiment (anti-reflection experiment)
Basis is provided.
Anti-reflection experimental method step of the invention is easy, arranges rationally, such as four steps, by two pressures for observing device
The pressure value of force snesor come judge gas whether adsorption equilibrium.
In short, the present invention preferable control gas and liquid nitrogen pressure and can control the specific size of liquid nitrogen infiltration coal body, fit
Anti-reflection experiment is carried out to coal body under varying experimental conditions in repeated multiple times, is conducive to obtain optimal anti-reflection scheme, is coal
The exploitation of layer gas utilizes offer technical support.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
Specific embodiment
As shown in Figure 1, experiment of the invention includes in sky with that can be pressurized the molten leaching coal seam with gas fracturing permeability improvement device of liquid nitrogen
The heat-preservation cylinder 1 of heart cylinder, heat-preservation cylinder 1 is vertically arranged, and 1 axial ends of heat-preservation cylinder is all closed, downward at 1 roof center of heat-preservation cylinder
It is connected with the inner cylinder 2 of hollow cylinder, there is gap between 1 bottom wall of 2 bottom end of inner cylinder and heat-preservation cylinder；It is horizontally mounted in the middle part of inner cylinder 2
There is pressure tight metal mesh sheet 3, about 2 inner cylinder is divided into coal body chamber 4 and admission chamber 5 by pressure tight metal mesh sheet 3；
Isolating valve 6 is installed in the middle part of inner cylinder 2, isolating valve 6 be located at it is below pressure tight metal mesh sheet 3 and adjacent with pressure tight metal mesh sheet 3, every
It is used to separate inner cylinder 2 from valve 6 and its valve rod stretches out heat-preservation cylinder 1 in the horizontal direction, the side wall sealing of the valve rod and heat-preservation cylinder 1 is matched
It closes；The mesh diameter of pressure tight metal mesh sheet 3 is 3mm ~ 7mm；
1 roof of heat-preservation cylinder on 2 top of inner cylinder is threaded with inside drum cover 7, and inside drum cover 7 is equipped with for applying axial pressure to coal sample
The screw thread axis body 8 of power, the bottom end of screw thread axis body 8 are equipped with pressure sensor 13, and clean gas stomata 16, are connected with coal sample chamber true
Empty table 14 and vacuum pump 15；Liquid nitrogen chamber 9 is surrounded between 1 side wall of inner cylinder 2 and heat-preservation cylinder, on 1 roof of heat-preservation cylinder on 9 top of liquid nitrogen chamber
Equipped with the first valve 10 for being passed through liquid nitrogen.
The heat-preservation cylinder 1 and inner cylinder 2 are made of clear material and (are such as made of low temperature resistant glass or plastics), and inner cylinder
2 wall outer surfaces are connected with the scale solid panel (being connected with the sealing of insulation barrel inner wall) 11 being made of clear material, and scale is three-dimensional
About 11 uniform intervals of plate are equipped with horizontal scale line 12, are separated by 1 millimeter between two neighbouring horizontal scale lines 12,0 quarter
Degree line 12 be located at pressure tight metal mesh sheet 3,0 graduation mark 12 to it is online every 1 centimetre of end in graduation mark 12 be carved with unit for li
The Arabic numerals for being used to indicate liquid nitrogen height of rice；4 side wall of coal body chamber is equipped with pressure sensor 17.Fig. 1 is signal
Figure, the quantity of graduation mark does not represent actual quantity in figure, experimental needs, and experiment of the invention is semi-soluble with that can be pressurized liquid nitrogen
Different size model numbers can be made in leaching fracturing permeability improvement device, and the quantity of graduation mark also accordingly increases and decreases.
The invention also discloses above-mentioned experiment is used, with that can be pressurized, liquid nitrogen is molten to soak predetermined coal seam with gas fracturing permeability improvement device
The anti-reflection experimental method of progress, it is characterised in that sequentially include the following steps:
First step is sealing propertytest；
Second step is that coal sample is added；
Third step is despumation gas, i.e., vacuumizes to coal body chamber.
Four steps is gas adsorption；
5th step is that liquid nitrogen is added；
6th step is coal body pressurization；
7th step is the fracture development experiment of coal sample to be carried out under the conditions of scheduled pressure condition and liquid nitrogen level, and perform reality
Test record；
Second to the 7th step is an experiment circulation；It include the liquid level height value and coal of the scheduled liquid nitrogen of N group in planning of experiments
4 pressure value of sample chamber, N are the natural number more than or equal to 1；
The corresponding experiment of the liquid level height value and coal body pressure value condition of every group of scheduled liquid nitrogen recycles, repeat second to
6th step, it is each to test the liquid level height value and coal body pressure value that one group of scheduled liquid nitrogen is used in circulation, until experiment is counted
After the corresponding experiment circulation of the liquid level height value and coal body pressure value of the scheduled liquid nitrogen of N group in drawing carries out, terminate complete
Portion's experiment.
The first step concrete operations are: the first valve 10 are connected with the tracheae of external high pressure nitrogen gas cylinder,
The tracheae of external high pressure nitrogen gas cylinder is connected with external high pressure nitrogen gas cylinder；The first valve 10 and isolating valve 6 are opened, is led to
It crosses high pressure nitrogen tracheae and the first valve 10 injects nitrogen into coal body chamber 4, nitrogen passes through 2 bottom end of inner cylinder and 1 bottom wall of heat-preservation cylinder
Between gap enter admission chamber 5；When pressure gauge 17 shows that the pressure in coal body chamber 4 and admission chamber 5 reaches predetermined value, close
First valve 10；If pressure reduction values are less than or equal to 0.01MPa after pressure maintaining 12 hours, continue second step；If
Pressure reduction values are greater than 0.01MPa after pressure maintaining 12 hours, then need close to that can be pressurized the semi-soluble leaching fracturing permeability improvement device progress of liquid nitrogen
After the maintenance of envelope property, first step is re-started；
The second step concrete operations are: opening inside drum cover 7, coal body is put into coal body chamber 4, then by despumation gas
Stomata 16 is connected with external vacuum pump.
The third step concrete operations are: close the first valve 10 and with isolating valve 6, by with removal of impurities gas stomata 16 connect
The vacuum pump 15 connect extracts the endoceliac miscellaneous gas of coal, until seeing that vacuum meter 14 shows that the intracavitary vacuum degree of coal body was kept in three minutes
Stablize；
The four steps concrete operations are: will be except the stomata 16 of foreign gas and the tracheae of external high pressure gas gas cylinder connect
It connecing, the tracheae of external high pressure gas gas cylinder is connect with pressure sensor, and pressure sensor is connected by tracheae with pressure reducing valve,
Pressure reducing valve is connect by tracheae with high pressure gas gas cylinder, and isolating valve 6 is closed, and opens high pressure gas gas cylinder, by controlling pressure reducing valve
Methane gas is injected to coal sample chamber 4, by the 17 control gas gas pressure of pressure sensor of coal body chamber, so that coal body is more preferably inhaled
Attached gas, the then coal body when the endoceliac pressure sensor 17 of coal is equal with the pressure sensor numerical value that high pressure gas gas cylinder connects
Adsorption gas balance.
The 5th step concrete operations are: the first valve 10 and isolating valve 6 are opened, by the first valve 10 and external liquid
Nitrogen pipeline is connected, and external liquid nitrogen pipeline is connected with external liquid nitrogen source (such as liquid nitrogen container), passes through liquid nitrogen pipeline and the first valve
Liquid nitrogen is added into liquid nitrogen chamber 9 for door 10, and liquid nitrogen enters inner cylinder by the gap between 1 bottom wall of inner cylinder 2 and heat-preservation cylinder from bottom to top
2, by entering coal body chamber 4 after admission chamber 5 and the mesh of pressure tight metal mesh sheet 3；
Staff observes the liquid nitrogen in coal body chamber 4 by transparent heat-preservation cylinder 1 and inner cylinder 2, according on scale scale plate 11
Scale and number obtain the accurate liquid level of liquid nitrogen；When the liquid level of liquid nitrogen, which will reach, tests scheduled height, the first valve is closed
Door 10 and isolating valve 6 stop the 5th step；
The 6th step concrete operations are: being applied by coal body of the screw thread axis body 8 on rotation inside drum cover 7 into inner cylinder axial
Pressure, the pressure predetermined value that the pressure sensor 13 connected by screw thread axis body 8 applies to control to coal body.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (4)
1. the molten leaching coal body fracturing permeability improvement device of liquid nitrogen can be pressurized, it is characterised in that: the heat-preservation cylinder including hollow cylinder, heat-preservation cylinder
Vertically arranged, heat-preservation cylinder axial ends is all closed, and is connected with the inner cylinder of hollow cylinder, inner cylinder at heat-preservation cylinder roof center downwards
There is gap between bottom end and heat-preservation cylinder bottom wall；It is horizontally installed with pressure tight metal mesh sheet in the middle part of inner cylinder, metal mesh sheet will be on inner cylinder
Under be divided into coal body chamber and admission chamber；
Isolating valve is installed, isolating valve is located at below pressure tight metal mesh sheet and, isolating valve adjacent with pressure tight metal mesh sheet in the middle part of inner cylinder
For separating inner cylinder and its valve rod stretches out heat-preservation cylinder in the horizontal direction, the side wall of the valve rod and heat-preservation cylinder, which seals, to be cooperated；Pressure resistance
The mesh diameter of metal mesh sheet is 3mm ~ 7mm；
The heat-preservation cylinder roof on inner cylinder top is threaded with inside drum cover, and inside drum cover is equipped with the spiral shell for increasing coal body axial compressive force
Line axis body, screw thread axis body lower end are equipped with pressure sensor, and removal of impurities gas stomata is additionally provided on inside drum cover；Inner cylinder and heat-preservation cylinder side wall
Between surround liquid nitrogen chamber, the heat-preservation cylinder roof on liquid nitrogen chamber top is equipped with the first valve for being passed through liquid nitrogen.
2. according to claim 1 be pressurized the molten leaching coal body fracturing permeability improvement device of liquid nitrogen, it is characterised in that: the heat-preservation cylinder
It is made of clear material with inner cylinder, and inner cylinder wall outer surface is connected with the scale solid panel being made of clear material, scale
Uniform intervals are equipped with horizontal scale line to solid panel up and down, are separated by 1 millimeter between two neighbouring horizontal scale lines, 0 scale
Line is located at metal mesh sheet, 0 graduation mark to it is online every 1 centimetre of end in graduation mark be carved with unit be centimetre be used to indicate liquid
The Arabic numerals of nitrogen height；Screw thread axis body lower end for increasing coal body axial compressive force is equipped with pressure sensor；Inner cylinder into
Two sides are provided with stomata at the top of sap cavity.
3. the anti-reflection experimental method carried out using the molten leaching coal body fracturing permeability improvement device of liquid nitrogen can be pressurized described in claim 2,
It is characterized in that sequentially including the following steps:
First step is sealing propertytest；
Second step is that coal body is added；
Third step is despumation gas；
Four steps is gas adsorption；
5th step is that liquid nitrogen is added；
6th step is coal body axial pressure；
7th step is the fracture development experiment of coal body to be carried out under the conditions of scheduled gas pressure condition and liquid nitrogen level, and make
Good experimental record；
Second to the 7th step is an experiment circulation；It include the liquid level height value and coal of the scheduled liquid nitrogen of N group in planning of experiments
Body pressure value, N are the natural number more than or equal to 1；
Every group of scheduled liquid nitrogen level height value and the corresponding experiment circulation of pressure value, repeat the second to the 6th step,
The liquid level height value and gas pressure value that one group of scheduled liquid nitrogen is used in each experiment circulation, until the N group in planning of experiments
After the corresponding experiment circulation of the liquid level height value and coal body pressure value of scheduled liquid nitrogen carries out, terminate all experimentss.
4. anti-reflection experimental method according to claim 3, it is characterised in that sequentially include the following steps:
The first step concrete operations are: the stomata for excluding miscellaneous gas are closed, by the first valve and external high pressure nitrogen gas cylinder
Tracheae be connected, the tracheae of external high pressure nitrogen gas cylinder is connected with external high pressure nitrogen gas cylinder；Open the first valve
And isolating valve, nitrogen is injected into coal body chamber by high pressure nitrogen gas cylinder and the first valve, nitrogen passes through inner cylinder bottom end and heat preservation
Gap between cylinder bottom wall enters admission chamber；When pressure gauge shows that the pressure in coal body chamber and admission chamber reaches predetermined value, close
Close the first valve；If pressure reduction values are less than or equal to 0.01MPa after pressure maintaining 12 hours, continue second step；If
Pressure reduction values are greater than 0.01MPa after pressure maintaining 12 hours, then need close to that can be pressurized the semi-soluble leaching fracturing permeability improvement device progress of liquid nitrogen
After the maintenance of envelope property, first step is re-started；
The second step concrete operations are: open inside drum cover, coal body is put into coal body chamber, then will removal of impurities gas stomata with it is external
Vacuum pump be connected；
The third step concrete operations are: it is intracavitary by the vacuum pump extraction coal body connecting with removal of impurities gas stomata to close isolating valve
Miscellaneous gas, until seeing that vacuum meter 14 shows that the intracavitary vacuum degree of coal body keeps stablizing in three minutes；
The four steps concrete operations are: removal of impurities gas stomata connect with the tracheae of external high pressure gas gas cylinder, it is external
The tracheae of high pressure gas gas cylinder is connect with pressure sensor, and pressure sensor is connected by tracheae with pressure reducing valve, and pressure reducing valve is logical
It crosses tracheae to connect with high pressure gas gas cylinder, closes the first valve and isolating valve, open high pressure gas gas cylinder, by controlling pressure reducing valve
Methane gas is injected to coal body chamber, the intracavitary gas pressure of coal body is controlled by the voltage sensor of coal body chamber, so that coal body is more preferable
Adsorption gas, the then coal when the endoceliac pressure sensor of coal is equal with the pressure sensor numerical value that high pressure gas gas cylinder connects
Body adsorption gas balance；
The 5th step concrete operations are: the first valve and isolating valve are opened, by the first valve and external liquid nitrogen pipeline phase
Even, external liquid nitrogen pipeline is connected with external liquid nitrogen source, by liquid nitrogen pipeline and the first valve to the intracavitary addition liquid of liquid nitrogen
Nitrogen, liquid nitrogen enter inner cylinder by the gap between inner cylinder and heat-preservation cylinder bottom wall from bottom to top, pass through admission chamber and pressure tight metal net
Enter coal sample chamber after the mesh of piece；
Staff observes the liquid nitrogen in coal body chamber by transparent heat-preservation cylinder and inner cylinder, according to the scale and number on scale plate
Obtain the accurate liquid level of liquid nitrogen；When the liquid level of liquid nitrogen, which is up to, tests scheduled height, isolating valve is closed, stops second step
Suddenly；
The 6th step concrete operations are: applying axial pressure by the coal body in the inside cylinder of screw thread axis body on rotation inside drum cover
Power, the pressure predetermined value applied to control to coal body by the pressure sensor connected on screw thread axis body.
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