CN115420666A - Positive freeze thawing soil gas permeability coefficient dynamic continuous testing system - Google Patents
Positive freeze thawing soil gas permeability coefficient dynamic continuous testing system Download PDFInfo
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- CN115420666A CN115420666A CN202211197387.5A CN202211197387A CN115420666A CN 115420666 A CN115420666 A CN 115420666A CN 202211197387 A CN202211197387 A CN 202211197387A CN 115420666 A CN115420666 A CN 115420666A
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- 238000012360 testing method Methods 0.000 title claims abstract description 54
- 230000035699 permeability Effects 0.000 title claims abstract description 24
- 239000002680 soil gas Substances 0.000 title claims abstract description 16
- 238000010257 thawing Methods 0.000 title claims abstract description 9
- 239000002689 soil Substances 0.000 claims abstract description 113
- 239000007789 gas Substances 0.000 claims abstract description 65
- 238000007710 freezing Methods 0.000 claims abstract description 19
- 230000008014 freezing Effects 0.000 claims abstract description 19
- 239000000110 cooling liquid Substances 0.000 claims abstract description 14
- 239000011229 interlayer Substances 0.000 claims abstract description 14
- 238000009413 insulation Methods 0.000 claims abstract description 8
- 230000008859 change Effects 0.000 claims abstract description 6
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims abstract description 3
- 230000008569 process Effects 0.000 claims abstract description 3
- 239000012466 permeate Substances 0.000 claims description 8
- 238000005315 distribution function Methods 0.000 claims description 7
- 238000009795 derivation Methods 0.000 claims description 4
- 230000003993 interaction Effects 0.000 claims description 4
- 238000011161 development Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 2
- 238000010622 cold drawing Methods 0.000 claims 2
- 239000012809 cooling fluid Substances 0.000 claims 2
- 230000018109 developmental process Effects 0.000 claims 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 238000009792 diffusion process Methods 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 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
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
-
- 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
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Fluid Mechanics (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a positive freeze-thaw soil gas permeability coefficient dynamic continuous testing system, which integrally comprises: sample soil, temperature control system, air supply system and confined pressure system. The sample soil divides the soil to be tested into a plurality of sections for testing, and a heat insulation rubber interlayer is additionally arranged to ensure that the testing soil is not influenced by the outside; the temperature control system realizes dynamic temperature change of sample soil freeze-thaw cycle through the upper end cold plate and the lower end cold plate, and the lower end cold plates and the upper end cold plates of different sample soil test sections are connected in parallel through cooling liquid pipelines to realize continuous sample soil temperature so as to dynamically and continuously test sample gas permeability coefficients; the confining pressure system utilizes the pressure stabilizing pump to maintain the outside pressure of the sample soil within a certain range, and the mutual acting force of the real environment in the transverse soil is restored, so that the form of the sample soil in the testing process is favorably kept. The invention reduces the difficulty of testing the gas permeability coefficient of the soil with large freezing depth, and can realize the dynamic continuous test and analysis of the positive freezing and thawing soil gas permeability coefficient along the freezing direction.
Description
Technical Field
The invention relates to the field of freeze-thaw soil fluid permeability parameter testing, in particular to a dynamic continuous testing system for a gas permeability coefficient of freeze-thaw soil.
Background
With the situation that China actively promotes energy structure transformation, two strategic targets of 'carbon peak reaching' and 'carbon neutralization' are provided. The price of fossil energy such as coal and petroleum is continuously rising, and the national energy structure with the over-strong dependence of fossil energy on the outside becomes a great challenge. The development and popularization of clean energy is urgent. Natural gas and hydrogen energy are taken as representatives of clean energy, and the device has the advantages of cleanness, no pollution, multiple obtaining modes and the like.
Natural gas and hydrogen are used as gas phase fluids, and pipeline transportation is considered in the transportation process. The length of a natural gas main pipeline in China reaches 11.6 ten thousand kilometers. China establishes a hydrogen transportation pipeline for about 400 kilometers, and the total finished mileage is estimated to be over 3000 kilometers in 2030. Wherein, it need bury in some comparatively abominable areas of environment not lack to have the main line way, for example: freeze-thaw soil areas.
China has wide breadth and various terrains and soil types. The permafrost region of China covers 16.6 percent, and the seasonal frozen soil occupies 58 percent of the area of the homeland. With the continuous development of national pipe networks, pipelines for transporting natural gas and hydrogen must face the challenge of freezing and thawing soil. The conventional freeze-thaw soil permeability parameters mainly aim at water and oil, and the problems of small freezing depth of the tested soil, high test difficulty of the whole section of freeze-thaw soil and the like exist.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system for dynamically and continuously testing the positive freeze-thaw soil gas permeability coefficient.
In order to achieve the purpose, the invention adopts the following technical scheme:
a dynamic continuous testing system for the positive freezing and thawing soil gas permeability coefficient integrally comprises four parts: sample soil, temperature control system, air supply system and confined pressure system. The test soil is divided into a plurality of sections along the freezing direction to be used as sample soil, and the sample soil is wrapped by a heat insulation rubber interlayer to reduce the influence of factors such as external temperature and the like; the temperature control system mainly controls the dynamic change of the temperature of the test system of the sample soil through the upper and lower cold plates of the sample soil, a cold source of the temperature control system conveys cooling liquid to the upper cold plate and the lower cold plate of the sample soil through cooling liquid pipelines, and two adjacent sections of sample soil are connected in parallel through the cooling liquid pipelines to realize temperature consistency, so that the continuity of the temperature of the adjacent sections of sample soil after the continuous soil is segmented is tested. And a permeation gas source of the gas supply system enters the lower end of the sample soil through a permeation gas pipeline after passing through the pressure gauge, permeates to the upper end of the sample soil and is discharged after passing through a gas flowmeter at the upper end, and the gas diffusion coefficient of the sample soil is obtained through a gas pressure distribution function of compressible gas in a porous medium and the Darcy's law. The confining pressure system maintains the pressure of the confining pressure interlayer through the pressure stabilizing pump, the interaction force of adjacent soil in a real environment is reduced, and the reliability of the test system is improved.
Preferably, the sample soil is used as two sections of the test soil, the outer side of the sample soil is wrapped by a heat insulation rubber interlayer to reduce the influence of external environmental factors, the test soil can be divided into a plurality of sections along the freezing direction, and the dynamic continuous test difficulty of the positive freezing and thawing soil gas permeability coefficient with large freezing depth is reduced.
Preferably, the cold source conveys the cooling liquid to the cold plate at the upper end and the cold plate at the lower end of the sample soil through the cooling liquid pipeline to realize the dynamic temperature change of the freeze-thaw cycle of the test soil.
Preferably, the cold source connects the lower end cold plate of the sample soil and the upper end cold plate of the adjacent sample soil in parallel through the cooling liquid pipeline to realize temperature consistency, so that the aim of continuous soil temperature of the sectional test is fulfilled, the reliability of the test system is ensured, and the operability of the test system is improved. .
Preferably, the pressure gauge tests the pressure sum of the permeation gas at the lower end of the sample soil, and calculates the gas diffusion pressure difference, so that the diffusion coefficient of the permeation gas can be obtained.
Preferably, the stabilized pressure pump conveys confining pressure gas to the confining pressure interlayer through the confining pressure gas pipeline, interaction force of the sample soil on transverse soil in a real environment is reduced, and reliability of the test system is improved.
Has the advantages that:
compared with the prior art, the invention has the following beneficial effects:
by performing sectional test on the soil to be tested, the difficulty of dynamic and continuous test of the positive freezing and thawing soil gas permeability coefficient with large freezing depth is reduced. The temperature of the cold plates at the upper end and the lower end of each section of sample soil can be controlled to realize the dynamic temperature change of the freeze-thaw cycle of the sample soil. The temperature continuity of the adjacent two sections of sample soil is realized through the cooling liquid loop, and the accuracy and the reliability of the test system are improved. The existence of the confining pressure interlayer greatly reduces the interaction of the sample soil in the transverse soil in the real environment, and the reliability of the test system is improved.
Drawings
FIG. 1 is a schematic of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example (b):
the present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
This embodiment will be described with reference to fig. 1. The positive freeze-thaw soil gas permeability coefficient dynamic continuous testing system in the embodiment integrally comprises four parts, namely sample soil, a temperature control system, a gas supply system and a confining pressure system. The test soil is divided into a plurality of sections along the freezing direction, the sample soil (1) and the sample soil (16) are two adjacent sections, and the sample soil (1) and the sample soil (16) are wrapped with heat insulation rubber interlayers (2); a cold source (3) of the temperature control system conveys cooling liquid to an upper end cold plate (5) and a lower end cold plate (6) of sample soil (1) through a cooling liquid pipeline (4) to control dynamic temperature change of the sample soil (1) and sample soil (16), and the cooling liquid pipeline (4) realizes temperature consistency by connecting the lower end cold plate (6) of the sample soil (1) and the upper end cold plate (5) of the sample soil (16) in parallel. The confining pressure system pumps gas into a confining pressure interlayer (9) between the heat insulation rubber interlayer (2) and the transparent confining pressure film (10) through a confining pressure gas pipeline through a pressure stabilizing pump (7) so as to keep the pressure of the sample soil (1) and the pressure of the outer side of the sample soil (16). A permeation gas source (11) of the gas supply system enters the lower ends of the sample soil (1) and the sample soil (16) through a permeation gas pipeline (13) after passing through a pressure gauge (12), diffuses to the upper ends of the sample soil (1) and the sample soil (16) and is discharged after passing through a gas flowmeter (15), and the pressure gauge (12) tests the pressure of the permeation gas at the inlet ends of the sample soil (1) and the sample soil (16)P in And the gas flow meter (15) is used for controlling the gas flow Q at the permeable gas outlet end, and the permeable gas obeys the gas pressure distribution function of the compressible gas in the porous medium in the vertical direction:
wherein the height h of the sample soil (1) and the sample soil (16), P (0, t) is the pressure at the inlet end of the permeation gas, P in For permeate gas outlet port gas pressure, P (h, t) is atmospheric pressure P since the outlet port permeate gas is directly vented to atmosphere 0 。
Further according to darcy's theorem, the average flow rate of permeate gas passing through the outlet end is:
wherein k is the gas permeability coefficient of the sample soil (1) and the sample soil (16), mu is the dynamic viscosity, A is the cross-sectional area of the gas outlet end pipe section,
is the pressure gradient of the permeating gas along the freezing direction.
Further derivation of the distribution function of the compressible gas in the porous medium yields:
and further substituting the formula after the derivation of the distribution function into Darcy's theorem, and calculating to obtain the gas diffusion coefficients of the sample soil (1) and the sample soil (16):
although the present invention has been described with reference to the above embodiments, it should be understood that the present invention is not limited to the above embodiments, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention.
Claims (6)
1. The utility model provides a positive freeze thawing soil gas permeability coefficient developments continuous test system which characterized in that: sample soil (1), sample soil (16), thermal insulation interlayer (2), cold source (3), steady voltage pump (7), upper end cold drawing (5), lower extreme cold drawing (6), manometer (12), gas flowmeter (15) wherein:
the sample soils (1) and (16) are divided into two sections of the test soil along the freezing direction, the sample soils (1) and (16) and the heat insulation rubber interlayer (2) are integrated, so that the influence of factors such as external temperature is isolated, and the accuracy of the test is improved;
the cold source (3) conveys cooling liquid to the sample soil (1) and the upper end cold plate and the lower end cold plate of the sample soil (16) through the cooling liquid pipeline (4), so that the dynamic process of freeze-thaw cycle of the sample soil (1) and the sample soil (16) at 10 ℃ to-20 ℃ is realized, and the reliability of the test system is improved;
the pressure stabilizing pump (7) maintains the pressure of the confining pressure interlayer (9) within a certain range through the confining pressure gas pipeline (8), reduces the mutual acting force of the sample soil (1) and the sample soil (16) in the transverse direction, keeps the soil form and improves the accuracy and reliability of the test;
the pressure gauge (12) can adjust the pressure of the permeation gas source (11), the permeation gas is conveyed to the lower ends of the sample soil (1) and the sample soil (16) through the permeation gas pipeline (13), the permeation gas permeates to the upper ends of the sample soil (1) and the sample soil (16) and is discharged, and then the outlet flow value is measured through the gas flowmeter (15).
2. The system for dynamically and continuously testing the positive freeze-thaw soil gas permeability coefficient according to claim 1, wherein the sample soil (1) and the sample soil (16) are used as two sections of the test soil, a heat insulation rubber interlayer (2) is wrapped outside the sample soil to reduce the influence of external environmental factors, the test soil can be divided into a plurality of sections along the freezing direction to test, and the difficulty of dynamically testing the positive freeze-thaw soil gas permeability coefficient with a large freezing depth is reduced.
3. The dynamic continuous testing system for positive freeze-thaw soil gas permeability coefficient according to claim 1, wherein the cold source (3) delivers cooling fluid to the sample soil (1) through the cooling fluid pipeline (4) and the upper end cold plate (5) and the lower end cold plate (6) of the sample soil (16) to realize dynamic temperature change of the freeze-thaw cycle of the test soil.
4. The system for dynamically and continuously testing the positive freeze-thaw soil gas permeability coefficient according to claim 1, wherein the cold source (3) connects the lower end cold plate (6) of the sample soil (1) and the upper end cold plate (5) of the sample soil (16) in parallel through the cooling liquid pipeline (4) to achieve temperature consistency, so that the purpose of continuous soil temperature of the sectional test is achieved, the reliability of the testing system is guaranteed, and the operability of the testing system is improved.
5. The dynamic continuous positive freeze-thaw soil gas permeability coefficient testing system according to claim 1, wherein the pressure gauge (12) tests a pressure P of a permeation gas at an inlet end of the sample soil (1) and the sample soil (16) in And the gas flow meter (15) is used for controlling the gas flow Q at the permeable gas outlet end, and the permeable gas obeys the gas pressure distribution function of the compressible gas in the porous medium in the vertical direction:
wherein the height h of the sample soil (1) and the sample soil (16), P (0, t) is the pressure at the inlet end of the permeation gas, P in To permeate the gas outlet end gas pressure, since the outlet end permeates the gasDirectly connected to the atmosphere, then P (h, t) is the atmospheric pressure P 0 ；
Further according to darcy's theorem, the average flow rate of permeate gas passing through the outlet end is:
wherein k is the gas permeability coefficient of the sample soil (1) and the sample soil (16), mu is the dynamic viscosity, A is the cross-sectional area of the gas outlet end pipe section,
a pressure gradient of the permeation gas along the freezing direction;
further derivation of the distribution function of the compressible gas in the porous medium yields:
and further substituting the formula obtained by derivation of the distribution function into Darcy's theorem to obtain the gas permeability coefficient.
6. The system for dynamically and continuously testing the positive freezing and thawing soil gas permeability coefficient according to claim 1, wherein the pressure stabilizing pump (7) is used for conveying confining pressure gas to the confining pressure interlayer (9) through the confining pressure gas pipeline (8), so that the interaction force of the sample soil (1) and the sample soil (16) on the transverse soil in a real environment is reduced, and the reliability of the testing system is improved.
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