CN108896742B - System for quantitatively analyzing shale anisotropy and application method thereof - Google Patents
System for quantitatively analyzing shale anisotropy and application method thereof Download PDFInfo
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Abstract
A system for quantitatively analyzing shale anisotropism comprises CO 2 The gas storage tank is connected with the gas injection pump sequentially through the guide pipe, the valve and the guide pipe, the gas injection pump is connected with the buffer chamber through the guide pipe, the buffer chamber is connected with the inlet of the mass flowmeter through the guide pipe, the outlet of the mass flowmeter extends into the center of the cubic shale sample through the gas injection pipe, three faces of the shale sample are respectively covered and fixed by the fixing plate, the other three faces are respectively covered by the absorption plates, and the centers of the absorption plates are respectively provided with the absorption holes: the absorption plate is filled with CO through the absorption hole, the conduit, the valve, the conduit and the conduit 2 The absorption bottle of the absorbent is connected with the external drying tube; when in use, the method respectively measures the CO on the sections of different shale samples 2 Further calculating the anisotropy coefficient of the shale sample; the method has the advantages of simultaneously analyzing the permeability of the shale in different directions, quantitatively analyzing the shale anisotropy in a laboratory, avoiding obvious damage to shale samples, having high reliability of test results and the like.
Description
Technical Field
The invention relates to the technical field of oil and gas exploration and development, in particular to a system for quantitatively analyzing shale anisotropy and a using method thereof.
Background
Shale gas is a self-generated and self-stored unconventional natural gas, and hydrocarbon key elements such as hydrocarbon source rock, reservoir and cap layer are unified into the same set of shale layer. Due to the fact that shale layer reason develops, permeability along the horizontal layer reason direction can be remarkably improved, and therefore shale gas is easy to escape from the layers, and formation of an underground shale gas reservoir is severely restricted.
Many scholars have conducted research on the anisotropy of shale reservoirs, and the most dominant research means at present is experimental test analysis. The experimental test mainly adopts a method for testing the permeability of the same shale sample or different shale samples in different directions, and researches the anisotropism of the shale based on the permeability. However, if an experiment is performed on the same sample, the shale sample is irreversibly damaged by the first permeability test, so that the reliability of the second permeability test result is directly affected; if testing is performed on adjacent samples, the sample-to-sample variability can negatively impact the comparability of the results, although damage to the samples by the testing process is avoided.
Since directional analysis of shale anisotropism is mainly carried out based on permeability measuring instruments at present, a special shale gas anisotropism measuring system is not formed yet; few students have proposed the concept of experimental test systems, but have not yet formed practical test systems, nor have specific combinations of systems been described in detail. In view of the significance of shale reservoir anisotropy analysis on shale gas preservation condition research, it is very necessary to design a set of testing system which can be used for quantitatively analyzing shale anisotropy and can not cause obvious damage to samples so as to meet urgent requirements of shale gas early-stage exploration.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a system for quantitatively analyzing shale anisotropy and a using method thereof, which can be used for measuring CO 2 The escape quantity of the gas in different sections of the shale can be used for achieving the purpose of calculating the shale anisotropy coefficient.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a system for quantitatively analyzing shale anisotropism comprises CO 2 The gas storage tank 1, the gas storage tank 1 is connected with the gas injection pump 5 sequentially through the conduit 2, the valve 3 and the conduit 4, the gas injection pump 5 is connected with the buffer chamber 7 through the conduit 6, the buffer chamber 7 is connected with the inlet of the mass flowmeter 9 through the conduit 8, the outlet of the mass flowmeter 9 is extended into the center of the cubic shale sample through the gas injection pipe 10, the rear face, the lower face and the side face of the shale sample are respectively covered and fixed by the first fixing plate 11, the second fixing plate 12 and the third fixing plate 13, the other three faces are respectively covered by the first absorbing plate 14, the second absorbing plate 15 and the third absorbing plate 16, the centers of the absorbing plates are respectively provided with absorbing holes, and the first absorbing plate 14 is filled with CO through the conduit 17, the first valve 18, the first conduit 19 and the first absorbing plate 14 2 The first absorbing bottle 20 of the absorbent is connected with and externally connected with a first drying pipe 21; the second absorption plate 15 is filled with CO from the second absorption hole through a conduit 22, a second valve 23, a second conduit 24 2 The second absorption bottle 25 of absorbent is connected with and externally connected with a second drying pipe 26; the third absorption plate 16 is filled with CO from the third absorption hole via the conduit 27, the third valve 28, the third conduit 29 2 The third absorbent bottle 30 of absorbent is connected to and circumscribes the third drying tube 31.
Said CO 2 The gas storage tank 1 can store more than 1L of CO 2 And (3) gas.
The gas injection pump 5 can provide gas injection power of 0-1.0MPa, and the adjustment precision is 0.01MPa.
The flow test range of the mass flowmeter 9 is 0-100ml/min, and the pressure resistance is 1.0Mpa.
The length of the gas injection pipe 10 is at least 20cm.
The panel sizes of the first fixing plate 11, the second fixing plate 12 and the third fixing plate 13 are 30cm multiplied by 30cm, and the sealing performance is good.
The first absorption plate 14, the second absorption plate 15 and the third absorption plate 16 are 30cm×30cm in size, and good in sealing performance.
The first absorption bottle 20, the second absorption bottle 25 and the third absorption bottle 30 are filled with CO 2 The concentration and volume of the absorbent can fully absorb CO in the system 2 The gas is preferably a gas. The proposal is to select Ca (OH) 2 Solution as CO 2 Absorbent, ca (OH) 2 The concentration of the solution was controlled to about 1mol/L, and the volume of the solution in each absorption bottle was about 200ml.
The first drying pipe 21, the second drying pipe 26 and the third drying pipe 31 are proposed to contain soda lime so as to absorb CO in the air 2 And water vapor.
All instruments and equipment, conduits, valves and parts in the system are well airtight.
The application method of the quantitative analysis shale anisotropic system comprises the following steps:
step one, preparing shale samples meeting the system requirements;
cutting shale as it is into a cubic sample according to the system size, and simultaneously drilling through an elongated channel from a certain cross-section center of the sample to the center of the sample for extending into the gas injection pipe 10;
step two, configuring CO 2 Absorbent, and equivalent amount of CO 2 The absorbent is respectively injected into 3 absorption bottles, and the absorption bottles and CO are respectively measured and recorded 2 Total mass of the absorbent;
configuring CO 2 The absorbent is equally divided into three parts and respectively injected into the first absorption bottle 20, the second absorption bottle 25 and the third absorption bottle 30 which are completely the same, and after injection, the total mass m of the absorption bottle and the absorbent is respectively weighed 1 、m 2 And m 3 And recording;
step three, an experimental instrument is utilized to assemble an experimental system, and a prepared shale sample is put in;
and assembling an experimental instrument according to an experimental system diagram, and placing the prepared shale sample. The gas injection pipe 10 extends into the center of the shale sample along a pre-drilled gas injection channel and will contain an equal amount of CO 2 The first, second and third absorption bottles 20, 25 and 30 of absorbent are connected to the centers of the first, second and third absorption plates 14, 15 and 16 in front of, on and beside the shale sample through pipes and valves, respectively, and after a period of time of standing the system, all valves in the system are closed;
step four, starting an experiment system, starting an air injection pump, and slowly injecting CO 2 ；
After all valves in the system are opened and the working power of the gas injection pump 5 is regulated to the minimum value, the gas injection pump 5 and the mass flowmeter 9 are opened to keep CO 2 Slowly and stably injecting gas into a shale sample, and monitoring whether the indication of the mass flowmeter 9 is obviously abnormal or not at any time;
step five, introducing CO 2 After a period of time, taking down 3 absorption bottles, respectively weighing the total mass of the absorption bottles after reaction, and calculating the CO with different cross sections 2 An absorption amount;
CO is introduced into 2 For a period of time t 1 Then, the gas filling pump 5 and the valve 3 are sequentially closed, and the first valve 18, the second valve 23 and the third valve 28 are simultaneously closed, after the system is completely stable, the first absorption bottle 20, the second absorption bottle 25 and the third absorption bottle 30 are taken down, and the total mass m of each absorption bottle and the internal absorbent is respectively weighed 1 ’、m 2 ' and m 3 ' sequentially calculating the CO absorbed in each bottle 2 The mass of the gas was (m 1 -m 1 ’)、(m 2 -m 2 ') and (m) 3 -m 3 ’)。
Step six, based on each section CO 2 Quantitatively calculating the anisotropism coefficient of the shale sample according to the absorption quantity;
the anisotropy coefficients of the horizontal (lamellar) and vertical directions can be calculated by the formula:
a h/z-1 ＝(m 3 -m 3 ’)/(m 2 -m 2 ’)
or a' h/z-1 ＝(m 1 -m 1 ’)/(m 2 -m 2 ’)
Calculating;
while the anisotropy coefficients in different horizontal directions can be expressed as:
a h/h-1 ＝(m 1 -m 1 ’)/(m 3 -m 3 ’)。
step seven, replacing shale samples, and adjusting and injecting CO 2 Time, researching the influence rule of time on the anisotropic coefficient;
shale samples collected in the same region and layer system are made into the same specification, and CO is gradually prolonged 2 Injection time, respectively t 2 、t 3 、t 4 、t 5 Etc. to sequentially measure different COs 2 Horizontal/vertical anisotropy coefficient under the condition of implantation amount (a h/z-2 、a h/z-3 、a h/z-4 、a h/z-5 ) And the horizontal/horizontal anisotropy coefficient (a h/h-2 、a h/h-3 、a h/h -4、a h/h-5 ) Researching the change rule of the anisotropic coefficient under different time conditions;
step eight, performing experimental post-treatment, and cleaning instrument equipment;
after all the samples are tested and the system is stable, all valves in the system are closed, shale samples are taken down, all the equipment and connecting pipelines are disassembled, all the instruments are cleaned, and CO is carried out 2 The cylinder 1 is stored in a specific position for the next use.
The invention has the beneficial effects that:
(1) The system for quantitatively analyzing the shale anisotropy in the laboratory can be provided, a new parameter for quantitatively characterizing the anisotropy is designed, and reliable laboratory data is provided for quantitative description of shale reservoirs;
(2) The damage of the testing means to shale samples is reduced as much as possible, and the reliability of the measured anisotropy coefficient is improved;
(3) The influence rule of different gas injection parameters on the shale anisotropy coefficient can be studied by adjusting the power of the water injection pump and the gas injection time.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Referring to FIG. 1, a system for quantitatively analyzing shale anisotropy includes CO 2 The gas storage tank 1, the gas storage tank 1 is connected with the gas injection pump 5 through the conduit 2, the valve 3 and the conduit 4 in sequence, the gas injection pump 5 is connected with the buffer chamber 7 through the conduit 6, the buffer chamber 7 is connected with the inlet of the mass flowmeter 9 through the conduit 8, and the outlet of the mass flowmeter 9 extends into the center of the cubic shale sample through the gas injection pipe 10. Three faces of the shale sample are covered and fixed by the first fixing plate 11, the second fixing plate 12 and the third fixing plate 13, respectively, while the remaining three faces are covered by the first absorbing plate 14, the second absorbing plate 15 and the third absorbing plate 16, respectively. Absorption holes are formed in the centers of the absorption plates: the first absorption plate 14 is filled with CO from the first absorption hole through a conduit 17, a first valve 18, a first conduit 19 2 The first absorbing bottle 20 of the absorbent is connected with and externally connected with a first drying pipe 21; the second absorption plate 15 is filled with CO from the absorption holes through a conduit 21, a valve 22, a conduit 23 2 The absorbent bottle 24 of the absorbent is connected with and externally connected with a second drying pipe 26; the third absorption plate 16 is filled with CO from the absorption holes through a conduit 25, a valve 26, a conduit 27 2 The absorbent bottle 28 for the absorbent is connected to and circumscribes the third drying tube 31.
Said CO 2 The gas storage tank 1 can store more than 1L of CO 2 A gas;
the gas injection pump 5 can provide gas injection power of 0-1.0MPa, and the adjustment precision is 0.01MPa;
the flow test range of the mass flowmeter 9 is 0-100ml/min, and the pressure resistance is 1.0MPa;
the length of the gas injection pipe 10 is at least 20cm;
the panel sizes of the first fixing plate 11, the second fixing plate 12 and the third fixing plate 13 are 30cm multiplied by 30cm, and the sealing performance is good;
the first absorption plate 14, the second absorption plate 15 and the third absorption plate 16 are 30cm multiplied by 30cm in size, and good in tightness;
the first absorption bottle 20, the absorption bottle 24 and the absorption bottle 28 are filled with CO 2 The concentration and volume of the absorbent can fully absorb CO in the system 2 The gas is preferably a gas. The proposal is to select Ca (OH) 2 Solution as CO 2 Absorbent, ca (OH) 2 The concentration of the solution was controlled to about 1mol/L, and the volume of the solution in each absorption bottle was about 200ml.
The first drying pipe 21, the second drying pipe 26 and the third drying pipe 31 are proposed to contain soda lime so as to absorb CO in the air 2 And water vapor.
All instruments, pipes and valves in the system have good air tightness.
The application method of the quantitative analysis shale anisotropic system comprises the following steps:
step one, preparing shale samples meeting the system requirements;
shale was cut as received into 30cm by 30cm cube samples, depending on the system size. In order to enable the experimental result to better reflect the difference between the shale layer arrangement direction and the vertical direction, the shale layer arrangement is ensured to be parallel to a certain section of the cube sample during cutting. Also, it is preferable to drill an elongated channel from the center of a certain section to the center of the sample so as to extend just into the gas injection tube 10.
Step two, configuring CO 2 Absorbent, and equivalent amount of CO 2 The absorbent is respectively injected into 3 absorption bottles, and the absorption bottles and CO are respectively measured and recorded 2 Total mass of the absorbent;
the patent suggests Ca (OH) 2 Solution as CO 2 Gas absorbent, required Ca (OH) 2 The concentration and mass of the solution are sufficient to absorb CO injected into the system 2 Preferably, the gas is not significantly corrosive. Ca (OH) 2 The solution was equally divided into three equal portions, each of which was sequentially injected into the identical first 20, second 25 and third 30 absorption bottles. After injection, the absorption bottle and Ca (OH) were weighed separately 2 Total mass m of solution 1 、m 2 And m 3 And recorded.
Step three, assembling an experimental system by using instrument equipment, and putting the prepared shale sample;
and assembling experimental equipment according to an experimental system diagram, and placing the prepared shale sample. Wherein, the bedding surface of the shale sample is horizontal, and the drilled gas injection channel is parallel to the ground. Flow direction and CO in the mass flowmeter 9 2 The airflow direction is uniform. The gas injection tube 10 extends into the shale sample centre along a pre-drilled gas injection channel. Will be filled with equal amounts of Ca (OH) 2 The first, second and third absorption bottles 20, 25 and 30 of the solution are connected to the centers of the first, second and third absorption plates 14, 15 and 16 in front of, on and at the sides of the shale sample through pipes and valves, respectively, for absorbing CO absorbed from different sides of the sample 2 And (3) gas. After the system is left to stand for a period of time, all valves in the system are closed.
Step four, starting an experiment system, starting an air injection pump, and slowly injecting CO 2 ；
After all valves in the system are opened and the working power of the gas injection pump 5 is regulated to the minimum value, the gas injection pump 5 and the mass flowmeter 9 are started, and whether the indication of the mass flowmeter 9 is obviously abnormal or not is monitored at any time. If the indication of the mass flowmeter 9 is obviously reduced or obvious fluctuation occurs, the gas injection pump 5 should be stopped immediately, all valves are closed, and whether plugging or damage occurs in each instrument and shale samples is detected. After the plugging or breakage condition is solved, repeating the related operations from the second step to the fourth step, and keeping the CO 2 The gas was slowly and smoothly injected into the shale sample.
Step five, introducing CO 2 After a period of time, taking down 3 absorption bottles, respectively weighing the total mass of the absorption bottles after reaction, and calculating the CO with different cross sections 2 An absorption amount;
CO is introduced into 2 For a period of time t 1 Then, the gas filling pump 5 and the valve 3 are sequentially closed, and the first valve 18, the second valve 23 and the third valve 28 are simultaneously closed. After the system is completely stable, the first absorption bottle 20, the second absorption bottle 25 and the third absorption bottle 30 are taken down, and the total mass m of each absorption bottle and the internal liquid is respectively weighed 1 ’、m 2 ' and m 3 ' sequentially calculating the CO absorbed in each bottle 2 The mass of the gas was (m 1 -m 1 ’)、(m 2 -m 2 ') and (m) 3 -m 3 '). If CO is absorbed in each bottle 2 The mass difference is small, and the extension of CO can be considered 2 The injection time or small amplitude adjusts the injection pump 5 operating power, but the injection rate is preferably such that no significant fracture of the shale sample occurs.
Step six, based on each section CO 2 Quantitatively calculating the anisotropism coefficient of the shale sample according to the absorption quantity;
based on the step five data, (m) 2 -m 2 ') can reflect the permeability in the vertical direction, while (m) 1 -m 1 ') and (m) 3 -m 3 ') may then represent the permeability in the horizontal (laminar) direction. Therefore, the anisotropy coefficients of the horizontal (lamellar) direction and the vertical direction can be calculated by the formula:
a h/z-1 ＝(m 3 -m 3 ’)/(m 2 -m 2 ’)
or a' h/z-1 ＝(m 1 -m 1 ’)/(m 2 -m 2 ’)
The representation is performed. Due to CO 2 The implantation direction may be the same as the direction of the implant (m 3 -m 3 The penetration ability in the') direction is greatly influenced, so a h/z-1 The anisotropy of the actual horizontal (lamellar) direction and the vertical direction can be better reflected.
The anisotropy coefficients in different horizontal directions can then be expressed as:
a h/h-1 ＝(m 1 -m 1 ’)/(m 3 -m 3 ’)。
step seven, replacing shale samples, and adjusting and injecting CO 2 Time, researching the influence rule of time on the anisotropic coefficient;
shale samples collected in the same region and layer are made into the same specification (30 cm multiplied by 30 cm), and CO is gradually prolonged 2 Injection time, respectively t 2 、t 3 、t 4 、t 5 Etc. to sequentially measure different COs 2 Horizontal/vertical anisotropy coefficient under injection time conditions (a h/z-2 、a h/z-3 、a h/z-4 、a h/z-5 ) And the horizontal/horizontal anisotropy coefficient (a h/h-2 、a h/h-3 、a h/h-4 、a h/h-5 ) And researching the change rule of the anisotropic coefficient under different time conditions.
And step eight, experimental post-treatment, and cleaning instrument equipment.
And after all the samples are tested and the system is stopped to be stable, closing all valves in the system, taking down shale samples, and disassembling all the instruments and equipment and connecting pipelines. Residual Ca (OH) in the first, second and third absorber bottles 20, 25 and 30 2 Pouring the solution into a special waste liquid beaker for subsequent treatment, and brushing the absorption bottle with clear water. CO 2 The cylinder 1 is stored in a specific position for the next use.
Claims (7)
1. A system for quantitatively analyzing shale anisotropy, comprising CO 2 The gas storage tank (1), gas storage tank (1) is connected with gas injection pump (5) through fourth pipe (2), valve (3), fifth pipe (4) in proper order, gas injection pump (5) are connected buffer chamber (7) through sixth pipe (6), buffer chamber (7) are connected into mass flowmeter (9) entry through ninth pipe (8), mass flowmeter (9) export then stretches into cubic shale sample center through gas injection pipe (10), shale sample back, below and side three face cover and fix by first fixed plate (11), second fixed plate (12) and third fixed plate (13) respectively, and the other three face is covered by first absorber plate (14), second absorber plate (15) and third absorber plate (16) respectively, each absorber plate center all sets up the absorption hole, first absorber plate (14) are by first absorber hole through tenth pipe (17), first valve (18), first pipe (19) and are held CO with 2 The first absorption bottle (20) of the absorbent is connected and externally connected with a first drying pipe (21); the second absorption plate (15) is composed of a second absorption Kong Jingdi seven guide pipes (22), a second valve (23), a second guide pipe (24) and a second guide pipe containing CO 2 The second absorption bottle (25) of the absorbent is connected with and externally connected with a second drying pipe (26); the third absorption plate (16) is composed of a third absorption Kong Jingdi eight guide pipe (27), a third valve (28), a third guide pipe (29) and a third guide pipe containing CO 2 Absorbent agentIs connected with a third absorption bottle (30) and is externally connected with a third drying pipe (31);
said CO 2 The gas storage tank (1) can store more than 1L of CO 2 A gas;
the gas injection pump (5) can provide gas injection power of 0-1.0MPa, and the adjustment precision is 0.01MPa.
2. A system for quantitatively analyzing shale anisotropism according to claim 1, characterized in that the flow rate test range of the mass flowmeter (9) is 0-100ml/min, and the pressure resistance is 1.0Mpa.
3. A system for quantitatively analyzing shale anisotropies as in claim 1, wherein the length of the gas injection tube (10) is at least 20cm.
4. The system for quantitative analysis of shale anisotropism according to claim 1, wherein the panel sizes of the first fixing plate (11), the second fixing plate (12) and the third fixing plate (13) are 30cm multiplied by 30cm;
the first absorption plate (14), the second absorption plate (15) and the third absorption plate (16) are 30cm multiplied by 30cm.
5. The system for quantitative analysis of shale anisotropies according to claim 1, wherein the first, second and third absorption bottles (20, 25, 30) contain CO 2 Absorbent concentration and volume to fully absorb CO in a system 2 Preferably, the gas is Ca (OH) 2 Solution as CO 2 Absorbent, ca (OH) 2 The concentration of the solution was controlled at 1mol/L, and the volume of the solution in each absorption bottle was 200ml.
6. A system for quantitatively analyzing shale anisotropism according to claim 1, wherein the first drying pipe (21), the second drying pipe (26) and the third drying pipe (31) are internally provided with soda lime.
7. A method of using the system of claim 1, comprising the steps of;
step one, preparing shale samples meeting the system requirements;
cutting shale as such into a cubic sample according to the system size, and simultaneously drilling through an elongated channel from the center of a certain section of the sample to the center of the sample for extending into an injection pipe (10);
step two, configuring CO 2 Absorbent, and equivalent amount of CO 2 The absorbent is respectively injected into 3 absorption bottles, and the absorption bottles and CO are respectively measured and recorded 2 Total mass of the absorbent;
configuring CO 2 Absorbent, CO 2 The absorbent is divided into three equal parts, and is respectively injected into a first absorption bottle (20), a second absorption bottle (25) and a third absorption bottle (30) which are completely the same, and after injection, the total mass m of the absorption bottle and the absorbent is respectively weighed 1 、m 2 And m 3 And recording;
step three, an experimental instrument is utilized to assemble an experimental system, and a prepared shale sample is put in;
assembling experimental instrument according to experimental system diagram, placing prepared shale sample, and making gas injection pipe (10) extend into shale sample center along pre-drilled gas injection channel, and will be filled with equivalent amount of CO 2 The first absorption bottle (20), the second absorption bottle (25) and the third absorption bottle (30) of the absorbent are respectively connected to the centers of the first absorption plate (14), the second absorption plate (15) and the third absorption plate (16) in front of, on and on the side surface of the shale sample through a conduit and a valve, and after the system is kept stand for a period of time, all valves in the system are closed;
step four, starting an experiment system, starting an air injection pump, and slowly injecting CO 2 ；
Opening all valves in the system, adjusting the working power of the gas injection pump (5) to the minimum value, and starting the gas injection pump (5) and the mass flowmeter (9) to maintain CO 2 Slowly and stably injecting gas into a shale sample, and monitoring whether the indication of a mass flowmeter (9) is obviously abnormal or not at any time;
step five, introducing CO 2 After a period of time, 3 absorption bottles are taken down, and the reacted absorption bottles are respectively weighedThe total mass of the bottle is collected, and CO with different cross sections is calculated 2 An absorption amount;
CO is introduced into 2 For a period of time t 1 Sequentially closing the gas injection pump (5) and the valve (3), simultaneously closing the first valve (18), the second valve (23) and the third valve (28), taking down the first absorption bottle (20), the second absorption bottle (25) and the third absorption bottle (30) after the system is completely stable, and respectively weighing the total mass m of each absorption bottle and the internal absorbent 1 ’、m 2 ' and m 3 ' sequentially calculating the CO absorbed in each bottle 2 The mass of the gas was (m 1 -m 1 ’)、(m 2 -m 2 ') and (m) 3 -m 3 ’)；
Step six, based on each section CO 2 Quantitatively calculating the anisotropism coefficient of the shale sample according to the absorption quantity;
the anisotropy coefficients in the horizontal and vertical directions can be expressed by the following formula:
a h/z-1 ＝(m 3 -m 3 ’)/(m 2 -m 2 ’)
or a' h/z-1 ＝(m 1 -m 1 ’)/(m 2 -m 2 ’)
Calculating;
while the anisotropy coefficients in different horizontal directions can be expressed as:
a h/h-1 ＝(m 1 -m 1 ’)/(m 3 -m 3 ’)；
step seven, replacing shale samples, and adjusting and injecting CO 2 Time, researching the influence rule of time on the anisotropic coefficient;
shale samples collected in the same region and layer system are made into the same specification, and CO is gradually prolonged 2 Injection time, respectively t 2 、t 3 、t 4 、t 5 Sequentially measuring different COs 2 The horizontal/vertical anisotropic coefficient and the horizontal/horizontal anisotropic coefficient under the injection quantity condition are used for researching the change rule of the anisotropic coefficient under different time conditions;
step eight, performing experimental post-treatment, and cleaning instrument equipment;
after all the samples are tested and the system is stable, all valves in the system are closed, shale samples are taken down, all the equipment and connecting pipelines are disassembled, all the instruments are cleaned, and CO is carried out 2 The air storage tank (1) is placed in a special position to be stored for the next use.
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