CN108956385B - Experimental system and experimental method for gas diffusion migration - Google Patents
Experimental system and experimental method for gas diffusion migration Download PDFInfo
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- CN108956385B CN108956385B CN201810606725.3A CN201810606725A CN108956385B CN 108956385 B CN108956385 B CN 108956385B CN 201810606725 A CN201810606725 A CN 201810606725A CN 108956385 B CN108956385 B CN 108956385B
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Abstract
The specification provides an experimental system and an experimental method for gas diffusion migration, wherein the system comprises: the device comprises a basic environment simulation device and a gas injection device, wherein the basic environment simulation device is used for simulating a basic state that corresponding gas is adsorbed in a rock core under geological conditions, and comprises a basic rock sample chamber, an air extraction part and a gas injection part, the basic rock sample chamber comprises a first rock core holder, and a first gas concentration detector and a first pressure gauge are arranged on an external pipeline of the first rock core holder; the diffusion migration simulation device comprises at least one diffusion migration rock sample chamber, the diffusion migration rock sample chamber comprises a second rock core holder, and a second gas concentration detector and a second pressure gauge are arranged on an external pipeline of the second rock core holder; and a first valve for putting the basic environment simulation device and the diffusion migration simulation device in a communication or non-communication state. The experimental scheme is high in reliability and is an experimental scheme for gas diffusion migration, and particularly the research on shale gas diffusion migration.
Description
Technical Field
The specification relates to an experimental system and an experimental method for gas diffusion migration.
Background
Shale gas is a typical natural gas conglomerate that originates from a reservoir, and one difference from conventional natural gas is that shale gas is formed in the source formation and then conglomerates closely without experiencing significant migration. Just because of the typical in situ reservoir formation pattern of shale gas, the former generally neglected the process of diffusion migration of shale gas during the research. However, in practice, the diffusion and migration of shale gas has an important influence on the shale gas formation, so it is necessary to systematically study the diffusion and migration process of shale gas in order to clarify the formation and accumulation mechanism of shale gas and improve the exploration efficiency of shale gas.
At present, a method for researching shale gas diffusion migration by using a numerical simulation method on the basis of a theory of fluid mechanics exists. However, the accuracy of the numerical simulation method is poor, and the diffusion and migration process of the shale gas cannot be well reflected.
Disclosure of Invention
The purpose of this specification is to provide an experimental system and an experimental method thereof that can simulate gas diffusion migration.
To achieve the above objects, in one aspect, the present specification provides a gas diffusion migration experiment system, comprising:
a base environment simulation device; the basic environment simulation device is used for simulating a basic state of corresponding gas adsorbed in a rock core under a geological condition; the basic environment simulation device comprises a basic rock sample chamber, and an air exhaust part and an air injection part which are respectively communicated with the basic rock sample chamber; the basic rock sample chamber comprises a first rock core holder, a first inlet pipeline and a first outlet pipeline which are respectively connected to two ends of the first rock core holder, and a first gas concentration detector and a first pressure gauge are arranged on the first outlet pipeline;
a diffusion migration simulation device; the diffusion migration simulation device comprises at least one diffusion migration rock sample chamber, the diffusion migration rock sample chamber comprises a second rock core holder, a second inlet pipeline and a second outlet pipeline, the second inlet pipeline and the second outlet pipeline are respectively connected to two ends of the second rock core holder, and a second gas concentration detector and a second pressure gauge are arranged on the second outlet pipeline;
and the first valve is used for enabling the first core holder of the basic environment simulation device and the second core holder of the diffusion migration simulation device to be in a communication or non-communication state.
In the experimental system for gas diffusion migration provided by the specification, the state of a core is simulated by arranging the basic environment simulation device when the core stores specific gas in a stratum environment, and the state of the core is simulated by arranging the diffusion migration simulation device when the core does not store the specific gas in the stratum environment; the two were then put into communication, simulating the process of diffusion migration of a particular gas between the cores. The device can simulate the process of gas diffusion migration and can obtain necessary research data, so that the device is a high-reliability gas diffusion migration experiment system, and is particularly used for the research of shale gas diffusion migration.
In the gas diffusion migration experiment system, preferably, the system further comprises a constant temperature device, and the base rock sample chamber and the diffusion migration rock sample chamber are arranged in the constant temperature device.
In the experimental system for gas diffusion migration, preferably, the system further comprises a gas metering device communicated with the diffusion migration simulating device; the gas metering device is used for metering the amount of gas discharged from the diffusion transport simulation device in an experiment.
In the gas diffusion migration experiment system, preferably, the diffusion migration simulation device comprises 2-4 diffusion migration rock sample chambers, and adjacent diffusion migration rock sample chambers are communicated in series.
In the experiment system for gas diffusion migration, preferably, the first core holder and the second core holder have accommodating cavities with the same specification and are used for accommodating cores with the same specification.
In the experimental system for gas diffusion migration, preferably, the gas pumping part comprises a vacuum pump and a vacuum pressure gauge, and the vacuum pump is communicated with the first inlet pipeline; and a vacuum pressure gauge is arranged on a pipeline of the vacuum pump communicated with the first inlet pipeline.
In the experimental system for gas diffusion migration, preferably, the gas injection part comprises a gas storage device, a pressurization device and a gas injection pressure gauge, the gas storage device is communicated with the pressurization device, and the pressurization device is communicated with the first inlet pipeline; and a gas injection pressure gauge is arranged on a pipeline of the pressurizing device communicated with the first inlet pipeline.
In another aspect, the present description provides an experimental method of conducting gas diffusion migration, the method comprising:
enabling a rock core arranged in the first rock core holder to be in a state of simulating that specific gas is stored under certain stratum conditions; the formation conditions include temperature and pressure;
enabling the core arranged in the second core holder to be in a state of simulating that specific gas is not stored under certain stratum conditions; the formation conditions include temperature and pressure;
communicating the first core holder with the second core holder, wherein specific gas stored in the core in the first core holder diffuses and migrates to the core in the second core holder;
and acquiring data of the change of the concentration and the pressure of the specific gas entering and exhausted from the second core holder along with time in the diffusion migration process, and researching the diffusion migration of the specific gas by combining basic data.
In the above experimental method for gas diffusion migration, preferably, the basic data includes: the amount of the specific gas exhausted from the second core holder, and formation condition data of the first core holder and the second core holder.
In the experimental method for gas diffusion migration, preferably, the core in the first core holder and the core in the second core holder are samples of the same specification.
In the experimental method for gas diffusion migration, preferably, the core in the first core holder and the core in the second core holder are both standard samples drilled perpendicular to the shale layer or are both standard column samples drilled parallel to the shale layer.
In the above experimental method for gas diffusion migration, preferably, the specific gas is methane.
Drawings
Fig. 1 is an experimental apparatus for gas diffusion migration provided in an embodiment of the present disclosure.
The reference numbers illustrate:
1. the system comprises a vacuum pump, 2, a vacuum pressure gauge, 3, an air extraction valve, 4, a gas storage device (high-pressure methane), 5, a pressurizing device, 6, a gas injection pressure gauge, 7, a gas injection valve, 8, a first plug, 9, a first rock sample, 10, a first rock core holder, 11, a first valve, 12, a first pressure gauge, 13, a first concentration detector (methane), 14, a first constant temperature box, 15, a second plug, 16, a second rock sample, 17, a second rock core holder, 18, a second valve, 19, a second pressure gauge, 20, a second concentration detector (methane), 21, a second constant temperature box, 22, a third plug, 23, a third rock sample, 24, a third rock core holder, 25, a third valve, 26, a third pressure gauge, 27, a third concentration detector (methane), 28, a third constant temperature box, 29, a fourth valve, 30 and a gas metering device.
Detailed Description
In order to clearly understand the technical features, purposes and advantages of the present specification, the following detailed description will be given of the technical solutions of the present specification, but the present specification is not to be construed as limiting the implementable scope of the present specification.
Referring to fig. 1, the present specification provides a gas diffusion migration experiment system, including:
a base environment simulation device; the basic environment simulation device is used for simulating a basic state of corresponding gas adsorbed in the rock core under a geological condition; the basic environment simulation device comprises a basic rock sample chamber, and an air exhaust part and an air injection part which are respectively communicated with the basic rock sample chamber; the basic rock sample chamber comprises a first rock core holder 10, a first inlet pipeline and a first outlet pipeline which are respectively connected to two ends of the first rock core holder 10, and a first gas concentration detector 13 and a first pressure gauge 12 are arranged on the first outlet pipeline;
a diffusion migration simulation device; the diffusion migration simulation device comprises at least one diffusion migration rock sample chamber, the diffusion migration rock sample chamber comprises a second rock core holder 17, a second inlet pipeline and a second outlet pipeline, the second inlet pipeline and the second outlet pipeline are respectively connected to two ends of the second rock core holder 17, and a second gas concentration detector 20 and a second pressure gauge 19 are arranged on the second outlet pipeline;
and a first valve 11 for putting the first core holder 10 of the basic environment simulation device and the second core holder 17 of the diffusion migration simulation device in a communicating or non-communicating state.
In some embodiments, the diffusion migration simulation device comprises 2-4 diffusion migration rock sample chambers, adjacent diffusion migration rock sample chambers being in series communication. Different diffusion rock sample chambers can be used for placing rock cores with the same lithology and rock cores with different lithologies. Therefore, the device can simulate the diffusion migration of gas under different lithological combination conditions. In the embodiment shown in fig. 1, the diffusion migration simulation device has two diffusion migration rock sample chambers which are connected in series. Wherein, a second rock core holder 17 is arranged in the first diffusion migration rock sample chamber, two ends of the second rock core holder 17 are connected with a second inlet pipeline and a second outlet pipeline, and a second gas concentration detector 20 and a second pressure gauge 19 are arranged on the second outlet pipeline. Similarly, a third core holder 24 is arranged in the second diffusion migration rock sample chamber, a third inlet pipeline and a third outlet pipeline are connected to two ends of the third core holder 24, and a third gas concentration detector 27 and a third pressure gauge 26 are arranged on the third outlet pipeline.
With continued reference to fig. 1, in this embodiment, the core holders in the two diffusion migration chambers are in series communication, i.e., the second outlet line of the second core holder 17 is in communication with the third inlet line of the third core holder 24.
In some embodiments, necessary valves may be provided on the inlet or outlet lines of the core holders of the diffusion migration chamber to facilitate control of communication or blocking between adjacent core holders. In the embodiment shown in fig. 1, a second valve 18 is provided in the second outlet line of the second core holder 17; a third valve 25 is provided on the second outlet line of the third core holder 24.
In some embodiments, each core holder is a core holder that can provide confining pressure for simulating the pressure state of the core in the formation environment. The core holder can withstand a certain pressure, and in the embodiment shown in fig. 1, the highest pressure that can be withstood by the first core holder 10, the second core holder 17, and the third core holder 24 is 80 MPa. In addition, when the core column sample testing tool is used, the side surfaces of core column samples (the first rock sample 9, the second rock sample 16 and the third rock sample 23) can be wrapped with rubber sleeves, and only the top surface and the bottom surface are reserved; and then putting the sample wrapped with the rubber sleeve into an inner cavity of the core holder, and plugging two end faces by plugs. The plug can be optionally connected with a corresponding outlet or inlet pipeline. As in the embodiment shown in fig. 1, the first core holder 10 has first plugs 8 at both ends; two ends of the second core holder 17 are provided with second plugs 15; the third core holder 24 has a third plug 22 at each end.
In some embodiments, in order to better simulate the formation temperature, the system further comprises a constant temperature device, wherein the base rock sample chamber and the diffusion migration rock sample chamber can be arranged in one constant temperature device or can be separately arranged in the respective constant temperature devices. In the embodiment shown in fig. 1, the basement rock sample chamber is arranged in an incubator 14 and the two diffusion transport rock sample chambers are arranged in an incubator 21 and an incubator 28, respectively. This separate arrangement facilitates separate temperature control, although they may be set to a uniform temperature during testing (e.g., to simulate the temperature of the same formation). Therefore, the device can simulate the diffusion migration of gas under various temperature and pressure field conditions. In particular, the temperature regulation range of the oven may be 18-120 ℃.
In some embodiments, the core holders in the base, diffusion migration, and migration chambers may be of the same or different specifications. The same specification means that the sample containing chambers of the core holder have the same size of bottom surface area and column height. In this case, cores of the same specification can be placed. Therefore, the diffusion migration of the gas in the fixed channel with the equal section can be simulated, and the diffusion migration rule can be conveniently analyzed. The rock core can be a same-phase rock core or rock cores of different lithofacies, and can be determined according to experimental requirements. "in phase" with respect to a geological species refers to a rock having the same mineral composition, structural composition, etc. of the rock.
In some embodiments, the system further comprises a gas metering device in communication with the diffusion migration simulating device; the gas metering device is used for metering the amount of gas discharged from the diffusion transport simulating device in the experiment. In the embodiment shown in fig. 1, the gas metering device 30 is arranged outside the diffusion migration simulating device, and the two are communicated through a pipeline. A fourth valve 29 is provided on the communication line.
In some embodiments, the specific configuration of the air extraction section is not limited, and may function to extract air from the first core holder 10. In order to reflect the condition of air extraction, a vacuum pressure gauge can be arranged on the air extraction pipeline. The monitoring range of the vacuum pressure gauge can be-0.1 to 0 MPa. In the embodiment shown in fig. 1, the gas evacuation section comprises a vacuum pump 1 and a vacuum pressure gauge 2, the vacuum pump 1 being in communication with a first inlet line of a first core holder 10; a vacuum pressure gauge 2 is arranged on a pipeline of the vacuum pump 1 communicated with the first inlet pipeline. In addition, an extraction valve 3 may be provided on a line where the vacuum pump 1 communicates with the first inlet line.
In some embodiments, the specific arrangement of the gas injection portion is not limited, and it may be sufficient to inject a specific gas under a certain pressure into the first core holder 10. The monitoring range of the gas injection pressure gauge may be 0 to 60 MPa. In the embodiment shown in fig. 1, the gas injection part comprises a gas storage device (high-pressure methane) 4, a pressurizing device 5 and a gas injection pressure gauge 6; the gas storage device 4 is communicated with the pressurizing device 5, and the pressurizing device 5 is communicated with a first inlet pipeline of the first rock core holder; and a gas injection pressure gauge 6 is arranged on a pipeline of the pressurizing device 5 communicated with the first inlet pipeline. In addition, a gas injection valve 7 may be provided on a line of the pressurizing device 5 communicating with the first inlet line.
Embodiments of the present disclosure also provide a method for testing gas diffusion migration, including:
(1) enabling a rock core arranged in the first rock core holder to be in a state of simulating that specific gas is stored under certain stratum conditions; the formation conditions include temperature and pressure;
(2) enabling the core arranged in the second core holder to be in a state of simulating that specific gas is not stored under certain stratum conditions; the formation conditions include temperature and pressure;
(3) communicating the first core holder with the second core holder, wherein specific gas stored in the core in the first core holder diffuses and migrates to the core in the second core holder;
(4) and acquiring data of the change of the concentration and the pressure of the specific gas entering and exhausted from the second core holder along with time in the diffusion migration process, and researching the diffusion migration of the specific gas by combining basic data.
In some embodiments, a plurality of second core holders may be provided, and the second core holders may be in serial communication with each other.
In some embodiments, the base data may include: the amount of the specific gas exhausted from the second core holder, and formation condition data of the first core holder and the second core holder.
In some embodiments, the core in the first core holder and the core in the second core holder are the same size samples. In addition, the two cores may be selected from samples having the same lithology or different lithologies as desired.
In some embodiments, the core in the first core holder and the core in the second core holder are both standard samples drilled perpendicular to the shale layer or are both standard samples drilled parallel to the shale layer.
In some embodiments, the specific gas is methane.
In some embodiments, the experimental apparatus for gas diffusion migration provided in the present specification is used to perform corresponding simulation experiments.
The following is an application example of using the experimental device shown in fig. 1 to study shale gas diffusion migration, and the specific steps are as follows:
firstly, research on diffusion migration of shale gas in vertical direction
Selecting three samples with different lithologies, drilling column samples (standard column samples with the diameter of 2.54cm and the length of 3 cm) perpendicular to the shale layer surface to obtain a first rock sample 9, a second rock sample 16 and a third rock sample 23, wrapping the side surfaces of the column samples with rubber sleeves, only reserving the top and bottom surfaces, and respectively putting the samples wrapped with the rubber sleeves into a first core holder 10, a second core holder 17 and a third core holder 24 in a vertical sequence.
Adjusting the three core holders to enable the samples to bear the same confining pressure (namely, simulating the formation pressure of the formation), and adjusting the thermostats of the three core chambers to the same temperature (namely, simulating the in-situ temperature of the formation); and opening the air extraction valve 3 to ensure that other valves are closed, and opening the vacuum pump 1 to pump the interior of the first rock sample 9 to vacuum. And (3) closing the vacuum pump 1 and the air extraction valve 3 to ensure that the basic rock sample chamber is not communicated with the diffusion migration rock sample chamber.
The gas injection valve 7, the pressurizing device 5 and the gas storage device 4 (internal high-pressure methane storage) are opened, the first rock sample 9 in the first core holder 10 starts to be filled with methane, and the pressurizing device 5 is used for ensuring that the methane can be filled into the pores of the first rock sample 9. And when the content of the methane gas in the first rock sample 9 reaches the in-situ gas content of the simulated formation, closing the gas injection valve 7, the pressurizing device 5 and the gas storage device 4.
The first valve 11, the second valve 18, the third valve 25 and the fourth valve 29 are opened to enable the shale gas to spontaneously diffuse and move from the first rock sample 9 into the second rock sample 16 and the third rock sample 23, the pressure change along with the time in the shale gas diffusion process is recorded through the first pressure gauge 12, the second pressure gauge 19 and the third pressure gauge 26, and the methane concentration change along with the time in the shale gas diffusion process is monitored through the first concentration detector (methane) 13, the second concentration detector (methane) 20 and the third concentration detector (methane) 27.
Secondly, researching the diffusion migration of the shale gas in the transverse direction
Selecting three samples with the same lithology, drilling column samples (standard column samples with the diameter of 2.54cm and the length of 3 cm) parallel to the shale layer surface to obtain a fourth rock sample, a fifth rock sample and a sixth rock sample, wrapping the side surfaces of the column samples with rubber sleeves, only reserving the top and bottom surfaces, and respectively placing the samples wrapped with the rubber sleeves into a first core holder 10, a second core holder 17 and a third core holder 24 according to the vertical sequence.
Adjusting three core holders according to the change of the stratum pressure of the simulated stratum in the transverse direction, so that the confining pressure of three rock samples is respectively the same as the stratum pressure of different structural parts, and adjusting the temperature of three thermostats so that the temperature of the three rock samples is respectively the same as the stratum temperature of different structural parts;
and opening the air extraction valve 3 to ensure that other valves are closed, and opening the vacuum pump 1 to vacuumize the interior of the fourth rock sample. And (3) closing the vacuum pump 1 and the air extraction valve 3 to ensure that the basic rock sample chamber is not communicated with the diffusion migration rock sample chamber.
The gas injection valve 7, the pressurizing device 5 and the gas storage device 4 (storing high-pressure methane) are opened, the first rock sample 9 in the first core holder 10 is filled with methane, and the pressurizing device 5 is used for ensuring that the methane can be filled into the pore space of the fourth rock sample. And when the content of the methane gas in the fourth rock sample reaches the in-situ gas content of the simulated formation, closing the gas injection valve 7, the pressurizing device 5 and the gas storage device 4.
The first valve 11, the second valve 18, the third valve 25 and the fourth valve 29 are opened to enable the shale gas to spontaneously diffuse and move from the fourth rock sample to the fifth rock sample and the sixth rock sample, the pressure change along with the time in the shale gas diffusion process is recorded through the first pressure gauge 12, the second pressure gauge 19 and the third pressure gauge 26, and the methane concentration change along with the time in the shale gas diffusion process is monitored through the first concentration detector (methane) 13, the second concentration detector (methane) 20 and the third concentration detector (methane) 27.
Therefore, the experimental system and the experimental method for gas diffusion migration provided by the embodiment of the specification can visually and conveniently observe and research the diffusion migration process of the shale gas in different lithologies and under different temperature and pressure field conditions.
Claims (8)
1. An experimental method for gas diffusion migration is characterized by specifically comprising the following steps:
enabling a rock core arranged in the first rock core holder to be in a state of simulating that specific gas is stored under certain stratum conditions; the formation conditions include temperature and pressure;
enabling the core arranged in the second core holder to be in a state of simulating that specific gas is not stored under certain stratum conditions; the formation conditions include temperature and pressure;
communicating the first core holder with the second core holder, wherein specific gas stored in the core in the first core holder diffuses and migrates to the core in the second core holder;
acquiring data of the change of the concentration and the pressure of specific gas entering and exhausted from the second core holder along with time in the diffusion migration process, and researching the diffusion migration of the specific gas by combining basic data;
the method is completed by an experimental system for gas diffusion migration, which comprises the following steps:
a base environment simulation device; the basic environment simulation device is used for simulating a basic state of corresponding gas adsorbed in a rock core under a geological condition; the basic environment simulation device comprises a basic rock sample chamber, and an air exhaust part and an air injection part which are respectively communicated with the basic rock sample chamber; the basic rock sample chamber comprises a first rock core holder, a first inlet pipeline and a first outlet pipeline which are respectively connected to two ends of the first rock core holder, and a first gas concentration detector and a first pressure gauge are arranged on the first outlet pipeline;
the air exhaust part comprises a vacuum pump and a vacuum pressure gauge, and the vacuum pump is communicated with the first inlet pipeline; a vacuum pressure gauge is arranged on a pipeline of the vacuum pump communicated with the first inlet pipeline;
the gas injection part comprises a gas storage device, a pressurizing device and a gas injection pressure gauge, the gas storage device is communicated with the pressurizing device, and the pressurizing device is communicated with the first inlet pipeline; a gas injection pressure gauge is arranged on a pipeline of the pressurizing device communicated with the first inlet pipeline;
a diffusion migration simulation device; the diffusion migration simulation device comprises 2-4 diffusion migration rock sample chambers, adjacent diffusion migration rock sample chambers are communicated in series, and diffusion migration of gas under different lithologic combination conditions is simulated; the diffusion migration rock sample chamber comprises a second rock core holder, a second inlet pipeline and a second outlet pipeline which are respectively connected to two ends of the second rock core holder, and a second gas concentration detector and a second pressure gauge are arranged on the second outlet pipeline;
and the first valve is used for enabling the first core holder of the basic environment simulation device and the second core holder of the diffusion migration simulation device to be in a communication or non-communication state.
2. The experimental method for gas diffusion migration according to claim 1, wherein the system further comprises a constant temperature device, and the base rock sample chamber and the diffusion migration rock sample chamber are arranged in the constant temperature device.
3. The experimental method of gas diffusion migration according to claim 1, characterized in that the system further comprises a gas metering device communicated with said diffusion migration simulating device; the gas metering device is used for metering the amount of gas discharged from the diffusion transport simulation device in an experiment.
4. The experimental method for gas diffusion migration according to claim 1, wherein the first core holder and the second core holder have accommodating cavities with the same specification and are used for accommodating cores with the same specification.
5. The experimental method for carrying out gas diffusion migration according to claim 1, characterized in that said basic data comprise: the amount of the specific gas exhausted from the second core holder, and formation condition data of the first core holder and the second core holder.
6. The experimental method for gas diffusion migration according to claim 1, wherein the core in the first core holder and the core in the second core holder are samples of the same specification.
7. The experimental method for gas diffusion migration according to claim 6, wherein the core in the first core holder and the core in the second core holder are both standard samples drilled perpendicular to the shale layer or are both standard samples drilled parallel to the shale layer.
8. The experimental method for carrying out gas diffusion transport according to claim 1, characterized in that said specific gas is methane.
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| CN114397228B (en) * | 2022-01-20 | 2024-10-18 | 西南石油大学 | Method for evaluating long-term migration performance of polymer for oil displacement in stratum |
| CN114486682A (en) * | 2022-02-10 | 2022-05-13 | 东北石油大学 | Evaluation device and method for carbon dioxide nano agent imbibition efficiency of shale oil reservoir |
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| CN202166583U (en) * | 2011-08-12 | 2012-03-14 | 东北石油大学 | Seepage distance change simulation experimental device of polymer solution in strata pores |
| CN102944666A (en) * | 2012-12-05 | 2013-02-27 | 西南石油大学 | Shale gas reservoir recovery simulation experimental device |
| CN105259080A (en) * | 2015-11-12 | 2016-01-20 | 西南石油大学 | Shale gas reservoir gas diffusion coefficient experiment test method |
| CN105300849A (en) * | 2015-11-27 | 2016-02-03 | 西南石油大学 | Device and method for testing gas diffusion coefficient in porous medium |
| CN106501155A (en) * | 2016-11-23 | 2017-03-15 | 中国地质大学（武汉） | Rock core gas liquid two purpose permeability test device and reservoir damage evaluation method |
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