CN109632557B - Gas-liquid two-phase saturated coal rock sample experimental device and saturation testing method - Google Patents

Gas-liquid two-phase saturated coal rock sample experimental device and saturation testing method Download PDF

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CN109632557B
CN109632557B CN201910059348.0A CN201910059348A CN109632557B CN 109632557 B CN109632557 B CN 109632557B CN 201910059348 A CN201910059348 A CN 201910059348A CN 109632557 B CN109632557 B CN 109632557B
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gas
rock sample
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main device
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CN109632557A (en
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吴财芳
韩江
李冠霖
房孝杰
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China University of Mining and Technology CUMT
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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

Abstract

The invention discloses a gas-liquid two-phase saturated coal rock sample experimental device, which comprises a rock core holder, wherein two ends of the rock core holder are respectively connected with a fluid inlet device and a fluid outlet device through compact copper pipes; the fluid inlet device comprises a main device box I and a plurality of gas-liquid pressurization boxes, wherein a humidity detector, a pressure detector and a methane concentration detector are arranged on the main device box I, and each gas-liquid pressurization box comprises a gas pressurization box and a liquid pressurization box; fluid eduction gear includes main device case two and evacuation pump, be provided with moisture detector, pressure detector and methane concentration detector on the main device case two, evacuation pump is used for building the low pressure environment in main device case two. The atomized liquid is used for replacing the traditional liquid, so that the resistance of the fluid passing through the porous medium is reduced, the damage of the fluid to the structure and the physical properties of the coal rock sample is reduced as much as possible, and the difficulty of liquid saturation and gas-liquid displacement is reduced.

Description

Gas-liquid two-phase saturated coal rock sample experimental device and saturation testing method
Technical Field
The invention relates to the technical field of coal mine production, in particular to a gas-liquid two-phase saturated coal and rock sample experimental device and a saturation testing method.
Background
In the coal bed gas well exploitation process, along with the progress of the drainage depressurization process, the pore pressure of a coal reservoir is continuously reduced, the effective stress of coal rock is gradually increased, the stress sensitivity effect is enhanced, and the permeability is reduced; when the reservoir pressure is reduced to the critical desorption pressure, the gas adsorbed on the coal rock begins to be desorbed and output, the coal matrix generates a contraction effect, the permeability begins to gradually increase, and an asymmetric U-shaped change curve is formed. The positive and negative effects enable the permeability of the coal reservoir to be always in a complex dynamic change process, and the reason for the dynamic change of the permeability is just the dynamic change of the gas and water states of the reservoir in different drainage and production time. Therefore, the exploration of the coal rock permeability and the change process thereof under different gas-water states can provide reference and guidance for the establishment of a coal bed gas drainage and production system.
At present, a direct water immersion method is mostly adopted in saturation experiments of coal and rock samples at home and abroad, the liquid saturation of the coal and rock samples cannot be guaranteed under the condition of relatively short water immersion time, and the direct water immersion method can influence the physical properties of the coal and rock samples and damage the original structure of the coal and rock samples.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a gas-liquid two-phase saturated coal and rock sample experimental device and a saturation testing method, wherein an ultrasonic high-frequency oscillation generating device is adopted to atomize the traditional liquid fluid into nanoscale liquid particles, the nanoscale liquid particles enter pores (cracks) in coal and rock through pressure difference and are fully saturated, the water saturation degree of the coal and rock sample is determined through a mass difference method and a humidity difference, and the gas saturation degree of the coal and rock sample can be determined according to a methane concentration difference method.
The technical scheme adopted by the invention is as follows: a gas-liquid two-phase saturated coal and rock sample experimental device comprises a rock core holder, wherein two ends of the rock core holder are respectively connected with a fluid inlet device and a fluid outlet device through compact copper pipes; the fluid inlet device comprises a main device box I and a plurality of gas-liquid pressurization boxes, wherein a humidity detector, a pressure detector and a methane concentration detector are arranged on the main device box I, and each gas-liquid pressurization box comprises a gas pressurization box and a liquid pressurization box; fluid eduction gear includes main device case two and evacuation pump, be provided with moisture detector, pressure detector and methane concentration detector on the main device case two, evacuation pump is used for building the low pressure environment in main device case two.
Further, a booster pump is arranged in the gas boosting box and connected with the gas storage tank, a booster pump is arranged in the liquid boosting box and connected with the closed water tank.
Furthermore, an ultrasonic high-frequency oscillation generating device is installed in the closed water tank.
Further, the bottom of the core holder is provided with a weighing unit.
Furthermore, the core holder is also connected with a pressure detector for monitoring the stress change of the coal rock sample in the gas-liquid saturation process, so that the safe and smooth operation of the experiment is ensured.
Further, the gas-liquid two-phase saturation coal rock sample saturation degree testing method comprises the following steps: a: the coal rock sample is placed on a rock core holder with a weighing unit, an ultrasonic high-frequency oscillation generating device is started, atomization of liquid is achieved, the atomized liquid is connected with a main device box I through a compact copper pipe after being subjected to pressurization treatment, a humidity detector, a pressure detector and a methane concentration detector are arranged on the main device box I, and the gas-liquid state in a measured sealing box is obtained through reading of an instrument. The atomized liquid is used for replacing the traditional liquid, so that the resistance of the fluid passing through the porous medium is reduced, and the damage of the fluid to the coal rock sample structure and the physical properties is reduced as much as possible;
b: gas and atomized liquid enter the core through the compact copper tube for clampingIn the device, the sample permeates into the coal rock sample under the action of pressure difference, enters a fluid discharge device through pores in the coal rock sample, and the maximum saturation mass m of the coal rock sample is determined by a mass difference methodmaxAnd comparing the calculated delta with the mass m of the coal rock sample in the natural statem＝mmax-m, setting an arithmetic progression
Figure BDA0001953625320000021
Different values of the arithmetic progression respectively correspond to different saturation degrees;
c: starting the vacuum pump to create a low-pressure environment in the main device box II and increase the pressure difference delta between the main device box I and the main device box IIpComparing the readings of the humidity detector and the methane concentration detector on the first main device box and the second main device box to determine the humidity difference delta at different saturation degreeseDifference of concentration delta from methanecWith this as a reference, it is also possible to determine different saturations from the difference in meter readings.
Furthermore, in the coal rock sample saturation testing method, aiming at coal rock samples with different physical structures and properties, a saturation experiment test is firstly carried out to obtain a corresponding saturation division standard, and then saturation is measured; for a coal rock sample with a small pore structure and poor permeability, the atomization mode is adopted to promote the permeation and saturation; the experimental process is carried out under the conditions of normal temperature and variable pressure.
Compared with the prior art, the invention has the beneficial effects that: the atomized liquid is used for replacing the traditional liquid, so that the resistance of the fluid passing through the porous medium is reduced, the damage of the fluid to the structure and the physical properties of the coal rock sample is reduced as much as possible, and the difficulty of liquid saturation and gas-liquid displacement is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a gas-liquid two-phase saturated coal and rock sample experimental device.
Wherein: 1-core holder, 2-fluid inlet device, 3-fluid outlet device, 11-weighing unit, 21-first main device box, 22-gas-liquid pressurizing box, 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-closed water tank and 22211-ultrasonic high-frequency oscillation generating device
Detailed Description
For the purpose of enhancing the understanding of the present invention, the present invention will be further explained with reference to the accompanying drawings and examples, which are only for the purpose of explaining the present invention and do not limit the scope of the present invention.
As shown in fig. 1, the gas-liquid two-phase saturated coal rock sample experimental device comprises a core holder 1, wherein two ends of the core holder 1 are respectively connected with a fluid inlet device 2 and a fluid outlet device 3 through compact copper pipes; the fluid inlet device 2 comprises a main device box 21 and a plurality of gas-liquid pressurizing boxes 22, wherein a humidity detector 211, a pressure detector 212 and a methane concentration detector 213 are arranged on the main device box 21, and the gas-liquid pressurizing boxes 22 comprise a gas pressurizing box 221 and a liquid pressurizing box 222; the fluid discharge apparatus 3 includes a main apparatus box 31 and a vacuum pump 32, the main apparatus box 31 is provided with a humidity detector 211, a pressure detector 212, and a methane concentration detector 213, and the vacuum pump 32 is used for creating a low-pressure environment in the main apparatus box 31.
In the above embodiment, a booster pump 2211 is arranged in the gas booster tank 221, the booster pump 2211 is connected with a gas storage tank 2212, a booster pump 2211 is arranged in the liquid booster tank 222, and the booster pump 2211 is connected with a closed water tank 2221; an ultrasonic high-frequency oscillation generating device 22211 is installed in the closed water tank 2221.
In the above embodiment, the bottom of the core holder 1 is provided with the weighing unit 11, and the core holder 1 is further connected with the pressure detector 212, wherein the pressure detector 212 is used for monitoring the stress change of the coal rock sample in the gas-liquid saturation process, so as to ensure the safe and smooth experiment.
In the above embodiment, the method for testing the saturation of the gas-liquid two-phase saturated coal rock sample includes the following steps: a: the coal rock sample is placed on a rock core holder with a weighing unit, an ultrasonic high-frequency oscillation generating device is started, atomization of liquid is achieved, the atomized liquid is connected with a main device box I through a compact copper pipe after being subjected to pressurization treatment, a humidity detector, a pressure detector and a methane concentration detector are arranged on the main device box I, and the gas-liquid state in a measured sealing box is obtained through reading of an instrument. The atomized liquid is used for replacing the traditional liquid, so that the resistance of the fluid passing through the porous medium is reduced, and the damage of the fluid to the coal rock sample structure and the physical properties is reduced as much as possible;
b: gas and atomized liquid enter the rock core holder through a compact copper pipe, are permeated into the coal rock sample under the action of pressure difference, enter the fluid discharge device through pore gaps in the coal rock sample, and determine the maximum saturation mass m of the coal rock sample through a mass difference methodmaxAnd comparing the calculated delta with the mass m of the coal rock sample in the natural statem＝mmax-m, setting an arithmetic progression
Figure BDA0001953625320000041
Different values of the arithmetic progression respectively correspond to different saturation degrees;
c: starting the vacuum pump to create a low-pressure environment in the main device box II and increase the pressure difference delta between the main device box I and the main device box IIpComparing the readings of the humidity detector and the methane concentration detector on the first main device box and the second main device box to determine the humidity difference delta at different saturation degreeseDifference of concentration delta from methanecWith this as a reference, it is also possible to determine different saturations from the difference in meter readings.
In the embodiment, in the coal rock sample saturation testing method, a saturation experiment test is performed on coal rock samples with different physical structures and properties to obtain corresponding saturation division standards, and then saturation is determined; for a coal rock sample with a small pore structure and poor permeability, the atomization mode is adopted to promote the permeation and saturation; the experimental process is carried out under the conditions of normal temperature and variable pressure.
The embodiments of the present invention are disclosed as the preferred embodiments, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention and make various extensions and changes without departing from the spirit of the present invention.

Claims (4)

1. The utility model provides a two-phase saturated coal petrography sample experimental apparatus of gas-liquid which characterized in that: the device comprises a rock core holder, wherein two ends of the rock core holder are respectively connected with a fluid inlet device and a fluid outlet device through compact copper pipes; the fluid inlet device comprises a main device box I and a plurality of gas-liquid pressurization boxes, wherein a humidity detector, a pressure detector and a methane concentration detector are arranged on the main device box I, and each gas-liquid pressurization box comprises a gas pressurization box and a liquid pressurization box; fluid eduction gear includes main device case two and evacuation pump, be provided with moisture detector, pressure detector and methane concentration detector on the main device case two, evacuation pump is used for building the low pressure environment in main device case two, gaseous pressure boost incasement is equipped with the booster pump, the booster pump is connected with the gas holder, liquid pressure boost incasement is equipped with the booster pump, the booster pump is connected with the closed water tank, install ultrasonic wave high frequency oscillation generating device in the closed water tank to test the two-phase saturated coal rock sample saturation of gas-liquid according to following method:
a: placing a coal rock sample on a rock core holder with a weighing unit, starting an ultrasonic high-frequency oscillation generating device to realize atomization of liquid, connecting the atomized liquid with a main device box through a compact copper pipe after pressurization treatment, obtaining a measured gas-liquid state in a sealed box by reading the reading of an instrument, and replacing the traditional liquid with the atomized liquid to reduce the resistance of the fluid passing through a porous medium and simultaneously reduce the damage of the fluid to the structure and physical properties of the coal rock sample as much as possible;
b: gas and atomized liquid enter the rock core holder through a compact copper pipe, permeate into the coal rock sample under the action of pressure difference, enter the fluid discharge device through pores in the coal rock sample, determine the maximum saturated mass mmax of the coal rock sample through a mass difference method, compare the maximum saturated mass mmax with the mass m of the coal rock sample in a natural state, calculate the maximum saturated mass mmax-m, and set an equal difference series
Figure FDA0003299456670000011
Different values of the arithmetic progression respectively correspond to different saturation degrees;
c: and starting a vacuum pumping pump, creating a low-pressure environment in the first main device box II, enhancing the pressure difference deltap between the first main device box I and the second main device box II, comparing the readings of the humidity detector and the methane concentration detector on the first main device box I and the second main device box II, and determining the humidity difference deltae and the methane concentration difference deltac at different saturation degrees, wherein the reference is the humidity difference deltae and the methane concentration difference deltac, and different saturation degrees can be determined according to the reading difference of the instruments.
2. The gas-liquid two-phase saturated coal and rock sample experimental device of claim 1, characterized in that: and a weighing unit is arranged at the bottom of the rock core holder.
3. The gas-liquid two-phase saturated coal and rock sample experimental device of claim 1, characterized in that: the core holder is also connected with a pressure detector for monitoring the stress change of the coal rock sample in the gas-liquid saturation process.
4. A saturation test method using the gas-liquid two-phase saturated coal and rock sample experimental device of claim 1 is characterized in that: in the coal rock sample saturation testing method, aiming at coal rock samples with different physical structures and properties, a saturation experiment test is firstly carried out to obtain a corresponding saturation division standard, and then saturation is measured; for a coal rock sample with a small pore structure and poor permeability, the atomization mode is adopted to promote the permeation and saturation; the experimental process is carried out under the conditions of normal temperature and variable pressure.
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