CN110220835B - Porous medium seepage visualization device under in-situ stress and parameter calculation method - Google Patents
Porous medium seepage visualization device under in-situ stress and parameter calculation method Download PDFInfo
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- 238000011065 in-situ storage Methods 0.000 title claims abstract description 32
- 238000012800 visualization Methods 0.000 title claims abstract description 17
- 238000004364 calculation method Methods 0.000 title claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 121
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 15
- 239000011521 glass Substances 0.000 claims description 7
- 239000003086 colorant Substances 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 6
- 239000004814 polyurethane Substances 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 238000013508 migration Methods 0.000 claims description 3
- 230000005012 migration Effects 0.000 claims description 3
- 238000005325 percolation Methods 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000011160 research Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 230000035699 permeability Effects 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000012360 testing method Methods 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
- G01N15/082—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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- 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
- G01N2015/0846—Investigating permeability, pore-volume, or surface area of porous materials by use of radiation, e.g. transmitted or reflected light
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Abstract
The invention discloses a porous medium seepage visualization device under in-situ stress and a parameter calculation method, wherein the device comprises the following steps: the device comprises a constant pressure cavity, a sample holder, a water inlet pipe and a water outlet pipe; the top and bottom of the constant pressure cavity are made of light-transmitting materials; the sample holder is located inside the constant voltage cavity, the sample holder includes the sample, first perforated plate, second perforated plate and pyrocondensation pipe, and first perforated plate and second perforated plate are fixed in the sample both sides, and first perforated plate and second perforated plate are used for controlling the even seepage flow of water to the sample, and the pyrocondensation pipe cover is in whole outsidely that first perforated plate, second perforated plate and sample are constituteed, and the one end of inlet tube is connected with the inlet end of first perforated plate, and the play water end of second perforated plate is connected with outlet pipe one end, and the other end of inlet tube and the other end of outlet pipe extend to the constant voltage outside of cavity. The invention can realize the visualization of the distribution of the three-dimensional seepage field of the sample.
Description
Technical Field
The invention relates to the technical field of energy exploitation experiments, in particular to a porous medium seepage visualization device under in-situ stress and a parameter calculation method.
Background
The seepage characteristic of the porous medium in the deep environment plays an important role in exploitation of petroleum, natural gas, shale gas and other resources. In the current indoor test, the research on the seepage characteristics of the porous medium under the stress-free condition is more, the related research on the seepage characteristics of the porous medium under the in-situ stress condition is less, and the research for realizing the visualization of the seepage process of the porous medium under the in-situ stress condition is less. And carrying out layered scanning on the porous medium sample under the in-situ stress condition by using a laser confocal microscope, and realizing the visualization of the distribution of the three-dimensional seepage field of the sample by using a three-dimensional reconstruction technology, thereby revealing the seepage characteristic of the sample.
Disclosure of Invention
The invention aims to provide a porous medium seepage visualization device under in-situ stress and a parameter calculation method, so as to realize visualization of sample three-dimensional seepage field distribution.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a porous media seepage visualization device under in-situ stress, comprising:
the device comprises a constant pressure cavity, a sample holder, a water inlet pipe and a water outlet pipe;
the top and bottom materials of the constant pressure cavity are light-transmitting materials;
the sample holder is located inside the constant pressure cavity, the sample holder includes sample, first perforated plate, second perforated plate and pyrocondensation pipe, first perforated plate has a water inlet end and a plurality of water outlet end, the second perforated plate has a water outlet end and a plurality of water inlet end, first perforated plate and second perforated plate are fixed in the sample both sides, first perforated plate and second perforated plate are used for controlling the even seepage flow of water to the sample, the pyrocondensation pipe cover is in the whole outside that first perforated plate, second perforated plate and sample are constituteed, the one end of inlet tube is connected with the water inlet end of first perforated plate, the water outlet end of second perforated plate is connected with outlet pipe one end, the other end of inlet tube and the other end of outlet pipe extend to the constant pressure outside of cavity.
Optionally, the sample holder further comprises a first cushion block and a second cushion block, the first cushion block is fixedly connected with the first porous plate, the second cushion block is fixedly connected with the second porous plate, holes are formed in the first cushion block and the second cushion block, the water inlet pipe penetrates through the holes of the first cushion block to be connected with the first porous plate, and the water outlet pipe penetrates through the holes of the second cushion block to be connected with the second porous plate.
Optionally, the sample holder further includes a first bracket and a second bracket, one end of the first bracket is fixedly connected with the first cushion block, the other end of the first bracket is fixedly connected with the constant pressure cavity, one end of the second bracket is fixedly connected with the second cushion block, and the other end of the second bracket is fixedly connected with the constant pressure cavity.
Optionally, the top and bottom materials of the constant pressure cavity are high-pressure-resistant transparent glass, and the rest materials of the constant pressure cavity are polyurethane materials.
Optionally, the fixed connection part of the high-pressure-resistant transparent glass and the polyurethane material is of a ladder-type structure.
Optionally, the heat shrinkable tube is made of transparent polytetrafluoroethylene.
Optionally, the device further comprises a first metering pump and a second metering pump, wherein the first metering pump is used for metering the water inflow of the water inlet pipe, and the second metering pump is used for metering the water outflow of the water outlet pipe.
Optionally, the device further comprises a differential pressure gauge, wherein the differential pressure gauge is used for collecting pressure changes of the water inlet end and the water outlet end of the sample.
Optionally, the device further comprises a constant pressure pump, wherein the constant pressure pump is used for injecting high-pressure water into the constant pressure cavity so as to maintain the constant pressure state of the constant pressure cavity.
A method for calculating a porous medium seepage parameter under in-situ stress, which is applied to the seepage device of the porous medium under the in-situ stress condition of any one of claims 1 to 9, and comprises the following steps:
processing the sample into cuboid slices, and grinding the upper and lower surfaces of the cuboid slices;
fixing a first porous plate and a second porous plate on the left side and the right side of a sample, respectively placing a first cushion block and a second cushion block on the two sides of the first porous plate and the second porous plate, connecting a water inlet pipe with a water inlet end of the first porous plate through the first cushion block, connecting a water outlet pipe with a water outlet end of the second porous plate through the second cushion block, wrapping a heat shrinkage pipe outside the whole formed by the first porous plate, the second porous plate and the sample, and placing the first cushion block and the second cushion block on a bracket;
the constant-pressure cavity is integrally arranged on an objective table of a laser confocal microscope, and a sample is scanned before seepage;
injecting high-pressure water containing a coloring agent into a sample through a water inlet pipe, and collecting data of the water quantity injected into the sample by using a first metering pump;
high-pressure water is injected into the constant-pressure cavity by using the constant-pressure pump, so as to create an in-situ stress condition;
after high-pressure water containing a coloring agent flows through a sample for a period of time, scanning by a laser confocal microscope to obtain a flow path and a migration rule of the fluid in a sample pore;
the second metering pump is used for collecting data of the water quantity of the output sample, and the differential pressure gauge is used for collecting pressure changes of the water inlet end and the water outlet end of the sample;
and calculating relevant seepage parameters according to the data of the first metering pump, the second metering pump and the differential pressure gauge.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the invention, stress conditions of different depths of the subsurface can be simulated by adjusting the pressure of the constant pressure cavity, the pressure of the water inlet pipe and the pressure of the water outlet pipe, then the laser confocal microscope is utilized to carry out multilayer scanning on the porous medium sample, and the complete three-dimensional structure characteristics of all micropores of the sample are displayed through the three-dimensional reconstruction technology, so that the research on the seepage characteristics of the porous medium under the in-situ stress condition is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be drawn according to these drawings without inventive effort to one of ordinary skill in the art.
FIG. 1 is a longitudinal section view of a porous media seepage visualization device under in-situ stress according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a porous media seepage visualization device under in-situ stress according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for calculating the percolation parameters of a porous medium under in-situ stress according to an embodiment of the present invention;
1-constant pressure cavity, 2-high pressure resistant transparent glass, 3-inlet tube, 4-outlet tube, 5-first porous plate, 6-sample, 7-second porous plate, 8-second cushion block, 9-first cushion block, 10-pyrocondensation pipe, 11-second bracket, 12-first bracket, 13-constant pressure pump, 14, first metering pump, 15-second metering pump, 16-differential pressure gauge.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a porous medium seepage visualization device under in-situ stress and a parameter calculation method, so as to realize visualization of sample three-dimensional seepage field distribution.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in further detail below with reference to the accompanying drawings and detailed description.
Fig. 1 is a longitudinal section view of a porous medium seepage visualization device under in-situ stress according to an embodiment of the present invention, and fig. 2 is a cross section view of a porous medium seepage visualization device under in-situ stress according to an embodiment of the present invention; as shown in fig. 1 and 2, the seepage device for porous medium under in-situ stress condition provided by the invention comprises:
the device comprises a constant pressure cavity 1, a sample holder, a water inlet pipe 3, a water outlet pipe 4, a constant pressure pump 13, a first metering pump 14, a second metering pump 15 and a differential pressure gauge 16.
The top and bottom materials of the constant-pressure cavity 1 are high-pressure-resistant transparent glass 2, so that laser penetration is facilitated, the rest of the constant-pressure cavity 1 is made of polyurethane materials, the high-pressure-resistant transparent glass 2 is connected with the polyurethane materials in a step-shaped clamping manner, the top of the constant-pressure cavity 1 is fixedly connected with the rest of the constant-pressure cavity 1 through bolts, and the upper side and the lower side of the constant-pressure cavity are respectively provided with a laser source and an objective table.
The sample holder is positioned in the constant pressure cavity 1 and comprises a sample 6, a first porous plate 5, a second porous plate 7, a first cushion block 9, a second cushion block 8, a heat shrinkage tube 10, a first bracket 12 and a second bracket 11;
the sample 6 is a cuboid sheet, the lengths of the water inlet pipe 3 and the water outlet pipe 4 can be changed by changing the size of the sample 6, namely, the size of the sample 6 is adjustable, the first porous plate 5 is provided with a water inlet end and a plurality of water outlet ends, the second porous plate 7 is provided with a water outlet end and a plurality of water inlet ends, the water outlet ends of the first porous plate 5 and the water inlet ends of the second porous plate 7 are uniformly distributed on the porous plates, the diversion of water flow can be realized, that is, the uniform seepage of the water to the sample 6 can be controlled, the water outlet ends of the first porous plate are fixedly connected with the sample 6 through glue, the water inlet ends of the second porous plate are fixedly connected with the sample 6 through glue, one end of the water inlet pipe 3 is connected with the water inlet end of the first porous plate 5, the water outlet end of the second porous plate 7 is connected with one end of the water outlet pipe 4, the other end of the water inlet pipe 3 and the other end of the water outlet pipe 4 extend to the outside the constant pressure cavity 1, the heat shrinkage pipe 10 is sleeved outside the whole body formed by the first porous plate 5, the second porous plate 7 and the sample 6, so that the high-pressure water in the constant pressure cavity 1 can be prevented from entering the sample 6, and the transparent polytetrafluoroethylene pipe 10 is beneficial to be made;
the first cushion block 9 and the second cushion block 8 are made of high-pressure-resistant and high-strength materials such as stainless steel, carbon fiber composite materials and the like, have high strength and can bear high pressure; the first cushion block 9 is fixedly connected with the first porous plate 5, the second cushion block 8 is fixedly connected with the second porous plate 7, holes are formed in the first cushion block 9 and the second cushion block 8, the water inlet pipe 3 penetrates through the holes of the first cushion block 9 to be connected with the water inlet end of the first porous plate 5, and the water outlet pipe 4 penetrates through the holes of the second cushion block 8 to be connected with the water outlet end of the second porous plate 7; the first cushion block 9 and the second cushion block 8 are used for fixing the whole body formed by the first porous plate 5, the second porous plate 7 and the sample 6 and serve as a carrier fixedly connected with the bracket;
one end of the first bracket 12 is fixedly connected with the first cushion block 9, the other end of the first bracket is fixedly connected with the constant pressure cavity 1, one end of the second bracket 11 is fixedly connected with the second cushion block 8, and the other end of the second bracket is fixedly connected with the constant pressure cavity 1;
the first metering pump 14, the second metering pump 15 and the pressure difference meter 16 are all positioned outside the constant pressure cavity 1, wherein the first metering pump 14 is connected to the water inlet pipe 3 and is used for metering the water inflow of the water inlet pipe 3, and the second metering pump 15 is connected to the water outlet pipe 4 and is used for metering the water outflow of the water outlet pipe 4; the differential pressure gauge 16 is used for collecting pressure changes of the water inlet end and the water outlet end of the sample; the constant pressure pump 13 is used for injecting high pressure water into the constant pressure chamber 1 to maintain the constant pressure state of the constant pressure chamber 1.
The device provided by the invention can simulate stress conditions of different depths under the ground by adjusting the pressure of the constant pressure cavity, the pressure of the water inlet pipe and the pressure of the water outlet pipe, performs multi-layer scanning on a porous medium sample by using a laser confocal microscope, and clearly displays the complete three-dimensional structural characteristics of all micropores of the sample by a three-dimensional reconstruction technology.
Fig. 3 is a flowchart of a method for calculating a porous medium seepage parameter under in-situ stress according to an embodiment of the present invention. The method for calculating the porous medium seepage parameters under the in-situ stress shown in fig. 3 comprises the following steps:
301 processing the sample into cuboid slices and grinding the upper and lower surfaces of the cuboid slices;
302, fixing a first porous plate and a second porous plate on the left side and the right side of a sample, respectively placing a first cushion block and a second cushion block on the two sides of the first porous plate and the second porous plate, connecting a water inlet pipe with a water inlet end of the first porous plate through the first cushion block, connecting a water outlet pipe with a water outlet end of the second porous plate through the second cushion block, wrapping a heat shrinkage pipe outside the whole formed by the first porous plate, the second porous plate and the sample, and placing the first cushion block and the second cushion block on a bracket;
303, integrally placing the constant-pressure cavity on an objective table of a laser confocal microscope, and scanning the sample before seepage;
304 injecting high-pressure water containing a coloring agent into the sample through a water inlet pipe, and collecting data of the water quantity injected into the sample by using a first metering pump;
305, injecting high-pressure water into the constant-pressure cavity by using the constant-pressure pump, and creating an in-situ stress condition;
306, after the high-pressure water containing the coloring agent flows through the sample for a period of time, scanning by a laser confocal microscope to obtain the flow path and the migration rule of the fluid in the pores of the sample;
307, collecting data of the water volume of the output sample by using a second metering pump, and collecting pressure changes of a water inlet end and a water outlet end of the sample by using a differential pressure meter;
308 calculate the associated seepage parameters from the data of the first metering pump, the second metering pump and the differential pressure gauge.
The specific calculation method of the seepage parameters is as follows:
calculating the hydraulic pore size and the permeability by using cube law:
hydraulic aperture:
permeability:
wherein: b (B) Hyd Mu is the viscosity of water (Pa.s), Q is the flow rate of water (m 3 S), Δp is the pressure difference (Pa), L is the length (m) of the sample, W is the width (m) of the sample; the flow rate of the water is obtained by the ratio of the difference between the readings of the first metering pump and the second metering pump to the time, and the pressure difference deltaP can be obtained by a differential pressure gauge.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the method disclosed in the embodiment, since it corresponds to the system disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (7)
1. The method for calculating the porous medium seepage parameter under the in-situ stress is applied to the porous medium seepage visualization device under the in-situ stress, and is characterized by comprising the following steps of:
the device comprises a constant pressure cavity, a sample holder, a water inlet pipe and a water outlet pipe;
the top and bottom materials of the constant pressure cavity are light-transmitting materials;
the sample holder is positioned in the constant pressure cavity, the sample holder comprises a sample, a first porous plate, a second porous plate and a heat shrinkage pipe, the sample is a cuboid sheet with the upper surface and the lower surface being ground, the first porous plate is provided with a water inlet end and a plurality of water outlet ends, the second porous plate is provided with a water outlet end and a plurality of water inlet ends, the first porous plate and the second porous plate are fixed on two sides of the sample through glue, the first porous plate and the second porous plate are used for controlling uniform seepage of water to the sample, the heat shrinkage pipe is sleeved outside the whole formed by the first porous plate, the second porous plate and the sample, one end of the water inlet pipe is connected with the water inlet end of the first porous plate, the water outlet end of the second porous plate is connected with one end of the water outlet pipe, and the other end of the water inlet pipe and the other end of the water outlet pipe extend to the outside of the constant pressure cavity;
the sample holder further comprises a first cushion block and a second cushion block, the first cushion block is fixedly connected with the first porous plate, the second cushion block is fixedly connected with the second porous plate, holes are formed in the first cushion block and the second cushion block, the water inlet pipe penetrates through the holes of the first cushion block to be connected with the first porous plate, and the water outlet pipe penetrates through the holes of the second cushion block to be connected with the second porous plate;
the sample holder further comprises a first bracket and a second bracket, one end of the first bracket is fixedly connected with the first cushion block, the other end of the first bracket is fixedly connected with the constant pressure cavity, one end of the second bracket is fixedly connected with the second cushion block, and the other end of the second bracket is fixedly connected with the constant pressure cavity;
the porous medium seepage parameter calculation method under the in-situ stress comprises the following steps:
processing the sample into cuboid slices, and grinding the upper and lower surfaces of the cuboid slices;
fixing a first porous plate and a second porous plate on the left side and the right side of a sample, respectively placing a first cushion block and a second cushion block on the two sides of the first porous plate and the second porous plate, connecting a water inlet pipe with a water inlet end of the first porous plate through the first cushion block, connecting a water outlet pipe with a water outlet end of the second porous plate through the second cushion block, wrapping a heat shrinkage pipe outside the whole formed by the first porous plate, the second porous plate and the sample, and placing the first cushion block and the second cushion block on a bracket;
the constant-pressure cavity is integrally arranged on an objective table of a laser confocal microscope, and a sample is scanned before seepage;
injecting high-pressure water containing a coloring agent into a sample through a water inlet pipe, and collecting data of the water quantity injected into the sample by using a first metering pump;
high-pressure water is injected into the constant-pressure cavity by using the constant-pressure pump, so as to create an in-situ stress condition;
after high-pressure water containing a coloring agent flows through a sample for a period of time, scanning by a laser confocal microscope to obtain a flow path and a migration rule of the fluid in a sample pore;
the second metering pump is used for collecting data of the water quantity of the output sample, and the differential pressure gauge is used for collecting pressure changes of the water inlet end and the water outlet end of the sample;
and calculating relevant seepage parameters according to the data of the first metering pump, the second metering pump and the differential pressure gauge.
2. The method for calculating the seepage parameters of the porous medium under the in-situ stress according to claim 1, wherein the top and the bottom of the constant pressure cavity are made of high-pressure-resistant transparent glass, and the rest of the constant pressure cavity is made of polyurethane.
3. The method for calculating the seepage parameters of the porous medium under the in-situ stress according to claim 2, wherein the fixed connection part of the high-pressure-resistant transparent glass and the polyurethane material is of a step-shaped structure.
4. The method for calculating the percolation parameters of a porous medium under in-situ stress according to claim 1, wherein said heat-shrinkable tube is made of transparent polytetrafluoroethylene.
5. The method for calculating the seepage parameters of the porous medium under the in-situ stress according to claim 1, further comprising a first metering pump and a second metering pump, wherein the first metering pump is used for metering the water inflow of the water inlet pipe, and the second metering pump is used for metering the water outflow of the water outlet pipe.
6. The method of claim 1, further comprising a differential pressure gauge for collecting pressure changes at the water inlet end and the water outlet end of the sample.
7. The method for calculating a porous medium percolation parameter under in-situ stress according to claim 1, further comprising a constant pressure pump for injecting high-pressure water into the constant pressure chamber to maintain a constant pressure state of the constant pressure chamber.
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