LU101541A1 - Gas-liquid two-phase saturated coal rock sample experimental device and saturation test method - Google Patents
Gas-liquid two-phase saturated coal rock sample experimental device and saturation test method Download PDFInfo
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- LU101541A1 LU101541A1 LU101541A LU101541A LU101541A1 LU 101541 A1 LU101541 A1 LU 101541A1 LU 101541 A LU101541 A LU 101541A LU 101541 A LU101541 A LU 101541A LU 101541 A1 LU101541 A1 LU 101541A1
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- liquid
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- coal rock
- saturation
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- 239000007788 liquid Substances 0.000 title claims abstract description 64
- 239000003245 coal Substances 0.000 title claims abstract description 60
- 239000011435 rock Substances 0.000 title claims abstract description 59
- 229920006395 saturated elastomer Polymers 0.000 title claims abstract description 18
- 238000010998 test method Methods 0.000 title claims abstract description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000012530 fluid Substances 0.000 claims abstract description 32
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052802 copper Inorganic materials 0.000 claims abstract description 10
- 239000010949 copper Substances 0.000 claims abstract description 10
- 230000000704 physical effect Effects 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 230000035699 permeability Effects 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 238000000889 atomisation Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 238000007599 discharging Methods 0.000 claims 1
- 238000005507 spraying Methods 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 abstract description 2
- 238000002474 experimental method Methods 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 238000009688 liquid atomisation Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
- G01N5/025—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content for determining moisture content
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
- G01N15/0893—Investigating volume, surface area, size or distribution of pores; Porosimetry by measuring weight or volume of sorbed fluid, e.g. B.E.T. method
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/10—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing diffusion of components through a porous wall and measuring a pressure or volume difference
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Immunology (AREA)
- Analytical Chemistry (AREA)
- Pathology (AREA)
- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
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Abstract
Disclosed are a gas-liquid two-phase saturated coal rock sample experimental device and a saturation test method. The device includes a core holder. Two ends of the core holder are connected to a fluid entry device and a fluid discharge device respectively by means of a dense copper tube. The fluid entry device includes a first main device box and a plurality of gas-liquid pressurization tanks. The first main device box is provided with a humidity detector, a pressure detector, and a methane concentration detector. The gas-liquid pressurization tank includes a gas pressurization tank and a liquid pressurization tank. The fluid discharge device includes a second main device box and a vacuum pump. The second main device box is provided with a humidity detector, a pressure detector, and a methane concentration detector. The vacuum pump is used to create a low-pressure environment in the second main device box. The present invention replaces the conventional liquid with atomized liquid, reduces the damage of the fluid to the structure and physical properties of the coal rock sample as much as possible while reducing the resistance of the fluid when passing through a porous medium, and reduces the difficulty in liquid saturation and gas-liquid displacement.
Description
GAS-LIQUID TWO-PHASE SATURATED COAL ROCK SAMPLE LU101541
EXPERIMENTAL DEVICE AND SATURATION TEST METHOD
TECHNICAL FIELD
The present invention relates to the field of coalmine production, and in particular, to a gas-liquid two-phase saturated coal rock sample experimental device and a saturation test method.
BACKGROUND
In the mining process of coalbed methane wells, with the progress of drainage and depressurization, the pore pressure of coal reservoirs is continuously reduced, the effective stress of coal rock is gradually increasing, the stress sensitivity effect is enhanced, and the permeability is reduced. The gas adsorbed to the coal rock begins to desorb when the reservoir pressure drops to the critical desorption pressure, the coal matrix shrinks, and the permeability begins to increase gradually, forming an asymmetric U-shaped curve. The positive and negative effects make the permeability of coal reservoirs always in a complex dynamic change process, and the reason for the dynamic change in the permeability is the dynamic change in the gas and water states of the reservoirs at different drainage times. Therefore, exploration of the permeability of coal rock under different gas and water conditions and its changing process can provide reference and guidance for the establishment of a coalbed methane drainage system.
At present, the direct immersion method is often adopted for the saturation experiments of coal rock samples at home and abroad. In the case of a relatively short immersion time, the liquid saturation of coal rock samples cannot be guaranteed, and the direct immersion method would affect the physical properties of the coal rock samples and damage the original structures of the coal rock samples.
SUMMARY
To overcome the foregoing deficiencies of the prior art, the present invention provides a gas-liquid two-phase saturated coal rock sample experimental device and a saturation test method, in which an ultrasonic high-frequency vibration generator is adopted to atomize a conventional liquid fluid into nanometer-sized liquid particles.
The liquid particles enter the pores (fracture) inside the coal rock by means of the LU101541 pressure difference and are fully saturated, and the water saturation degree of the coal rock sample is determined by a mass difference method and a humidity difference. Similarly, the gas saturation degree of the coal rock sample can be determined according to a methane concentration difference method.
The technical solution adopted by the present invention is: a gas-liquid two-phase saturated coal rock sample experimental device, comprising a core holder. Two ends of the core holder are connected to a fluid entry device and a fluid discharge device respectively by means of a dense copper tube. The fluid entry device comprises a first main device box and a plurality of gas-liquid pressurization tanks. The first main device box is provided with a humidity detector, a pressure detector, and a methane concentration detector. The gas-liquid pressurization tank comprises a gas pressurization tank and a liquid pressurization tank. The fluid discharge device comprises a second main device box and a vacuum pump. The second main device box is provided with a humidity detector, a pressure detector, and a methane concentration detector. The vacuum pump is used to create a low-pressure environment in the second main device box.
Further, a booster pump is disposed in the gas pressurization tank, and the booster pump is connected to a gas storage tank. A booster pump is disposed in the liquid pressurization tank, and the booster pump is connected to a sealed water tank.
Further, an ultrasonic high-frequency vibration generator is mounted in the sealed water tank.
Further, a weighing unit is disposed at the bottom of the core holder.
Further, the core holder is further connected to a pressure detector for monitoring the change in stress of the coal rock sample in the gas-liquid saturation process to ensure safe and smooth operation of the experiment.
Further, a gas-liquid two-phase saturated coal rock sample saturation test method is provided. The method comprises the following steps: a: placing a coal rock sample on a core holder having a weighing unit, and turning on an ultrasonic high-frequency vibration generator to realize the liquid atomization; coupling the atomized liquid subjected to pressurization processing to a first main device box by means of a dense copper tube, wherein the first main device box is provided with a humidity detector, a pressure detector, and a methane concentration detector, and obtaining the gas-liquid state in a measured seal box by taking meter readings, wherein the conventional liquid is replaced with the atomized liquid, such that the damage of the fluid to the structure and physical properties of the coal rock sample is reduced as much as possible while reducing the resistance of the fluid when passing through a porous medium;
b: making the gas and the atomized liquid enter the core holder through the dense copper tube, penetrate into the coal rock sample under the effect of a pressure difference, and enter a fluid discharge device through pore-fractures inside the coal rock sample, determining the maximum saturation mass mmax °f the coal rock sample through a mass difference method, comparing with the mass m of the coal rock sample in the natural state to calculate ~ mmax ~m, and setting an arithmetic progression Ôm, ......δwherein different values of the arithmetic progression correspond to different saturations, respectively; and c: turning on a vacuum pump to create a low-pressure environment in a second main device box, increasing a pressure difference δρ between the first main device box and the second main device box; comparing the readings of humidity detectors and methane concentration detectors on the first main device box and the second main device box; determining a humidity difference δβ and a methane concentration difference Sc at different saturations; and on this basis, determining different saturations according to the meter readings.
Further, in the coal rock sample saturation test method, a saturation test is first performed on coal rock samples having different physical structures and properties to obtain corresponding saturation division standards, and then the saturation measurement is performed. For coal rock samples with small pore structure and poor permeability, the penetration and saturation are promoted by means of atomization. The experimental process is performed at normal temperature and variable pressure conditions.
Compared with the prior art, the present invention has the following advantageous effects: the conventional liquid is replaced with the atomized liquid, LU101541 such that the damage of the fluid to the structure and physical properties of the coal rock sample is reduced as much as possible while reducing the resistance of the fluid when passing through a porous medium, and the difficulty in liquid saturation and gas-liquid displacement is reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic structural diagram of a gas-liquid two-phase saturated coal rock sample experimental device according to the present invention.
In the drawing, 1-core holder, 2-fluid entry device, 3-fluid discharge device, 11-weighing unit, 21-main device box I, 22-gas-liquid pressurization tank, 31-second main device box, 32-vacuum pump, 211-humidity detector, 212-pressure detector, 213-methane concentration detector, 2211-booster pump, 2212-gas storage tank, 2221-sealed water tank, 22211-ultrasonic high-frequency vibration generator
DETAILED DESCRIPTION OF THE INVENTION
In order to deepen the understanding of the present invention, the present invention will be further described in conjunction with the accompanying drawings and one embodiment. The embodiment is only illustrative of the present invention and is not intended to limit the protection scope of the present invention.
As shown in FIG. 1, a gas-liquid two-phase saturated coal rock sample experimental device comprises a core holder 1. Two ends of the core holder 1 are connected to a fluid entry device 2 and a fluid discharge device 3 respectively by means of a dense copper tube. The fluid entry device 2 includes a first main device box 21 and a plurality of gas-liquid pressurization tanks 22. The first main device box 21 is provided with a humidity detector 211, a pressure detector 212, and a methane concentration detector 213. The gas-liquid pressurization tank 22 comprises a gas pressurization tank 221 and a liquid pressurization tank 222. The fluid discharge device 3 comprises a second main device box 31 and a vacuum pump 32. The second main device box 31 is provided with a humidity detector 211, a pressure detector 212, and a methane concentration detector 213. The vacuum pump 32 is used to create a low-pressure environment in the second main device box 31.
In the foregoing embodiment, a booster pump 2211 is disposed in the gas LU101541 pressurization tank 221, and the booster pump 2211 is connected to a gas storage tank 2212. A booster pump 2211 is disposed in the liquid pressurization tank 222, and the booster pump 2211 is connected to a sealed water tank 2221. An ultrasonic high-frequency vibration generator 22211 is mounted in the sealed water tank 2221.
In the foregoing embodiment, a weighing unit 11 is disposed at the bottom of the core holder 1, and the core holder 1 is further connected to a pressure detector 212 for monitoring the change in stress of the coal rock sample in the gas-liquid saturation process to ensure safe and smooth operation of the experiment.
In the foregoing embodiment, a gas-liquid two-phase saturated coal rock sample saturation test method comprises the following steps, a: The coal rock sample is placed on a core holder having a weighing unit, and an ultrasonic high-frequency vibration generator is turned on to realize the liquid atomization; the atomized liquid subjected to pressurization processing is coupled to a first main device box by means of a dense copper tube, wherein the first main device box is provided with a humidity detector, a pressure detector, and a methane concentration detector; and the gas-liquid state in a measured seal box is obtained by taking meter readings. The conventional liquid is replaced with the atomized liquid, such that the damage of the fluid to the structure and physical properties of the coal rock sample is reduced as much as possible while reducing the resistance of the fluid when passing through a porous medium.
b: The gas and the atomized liquid enter the core holder through the dense copper tube, penetrate into the coal rock sample under the effect of a pressure difference, and enter a fluid discharge device through pore-fractures inside the coal rock sample. The maximum saturation mass mmax of the coal rock sample is determined through a mass difference method and is compared with the mass m of the coal rock sample in the natural state to calculate Sm = mmax — m, and an arithmetic progression — 8m. — Sm... ...8m is set, wherein different values of the arithmetic progression correspond to different saturations, respectively.
c: A vacuum pump is turned on to create a low-pressure environment in a second main device box, and a pressure difference between the first main device box and the second main device box is increased. The readings of humidity detectors and methane concentration detectors on the first main device box and the second main device box are compared, and a humidity difference and a methane concentration 5 difference ßc at different saturations are determined. On this basis, different saturations are determined according to the meter readings.
In the foregoing embodiment, in the coal rock sample saturation test method, a saturation test is first performed on coal rock samples having different physical structures and properties to obtain corresponding saturation division standards, and 10 then the saturation measurement is performed. For coal rock samples with small pore structure and poor permeability, the penetration and saturation are promoted by means of atomization. The experimental process is performed at normal temperature and variable pressure conditions.
The embodiment of the present invention is a preferred embodiment, but the 15 present invention is not limited thereto. Those skilled in the art can easily understand the spirit of the present invention and make different extensions and changes according to the foregoing embodiment, which fall within the protection scope of the present invention without departing from the spirit of the present invention.
Claims (7)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910059348.0A CN109632557B (en) | 2019-01-22 | 2019-01-22 | Gas-liquid two-phase saturated coal rock sample experimental device and saturation testing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| LU101541A1 true LU101541A1 (en) | 2020-04-17 |
| LU101541B1 LU101541B1 (en) | 2020-05-08 |
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| LU101541A LU101541B1 (en) | 2019-01-22 | 2019-05-22 | Gas-liquid two-phase saturated coal rock sample experimental device and saturation test method |
Country Status (5)
| Country | Link |
|---|---|
| CN (1) | CN109632557B (en) |
| BE (1) | BE1026550B1 (en) |
| LU (1) | LU101541B1 (en) |
| NL (1) | NL2024554B1 (en) |
| WO (1) | WO2020151138A1 (en) |
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| CN109238938B (en) * | 2018-09-21 | 2019-10-29 | 中国石油大学(北京) | Stress sensitive experimental provision and its method under triaxial state of stress |
| CN109164032A (en) * | 2018-11-01 | 2019-01-08 | 中国矿业大学 | Full-automatic saline-supercritical CO rock2Two-phase permeability testing system and method |
| CN109632557B (en) * | 2019-01-22 | 2021-11-16 | 中国矿业大学 | Gas-liquid two-phase saturated coal rock sample experimental device and saturation testing method |
-
2019
- 2019-01-22 CN CN201910059348.0A patent/CN109632557B/en active Active
- 2019-05-22 LU LU101541A patent/LU101541B1/en active IP Right Grant
- 2019-05-22 WO PCT/CN2019/087898 patent/WO2020151138A1/en active Application Filing
- 2019-12-22 NL NL2024554A patent/NL2024554B1/en not_active IP Right Cessation
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Also Published As
| Publication number | Publication date |
|---|---|
| NL2024554B1 (en) | 2020-11-23 |
| LU101541B1 (en) | 2020-05-08 |
| BE1026550A1 (en) | 2020-03-13 |
| WO2020151138A1 (en) | 2020-07-30 |
| CN109632557B (en) | 2021-11-16 |
| NL2024554A (en) | 2020-08-18 |
| BE1026550B1 (en) | 2021-03-03 |
| CN109632557A (en) | 2019-04-16 |
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