CN103674800A - Measuring method for permeability of low-permeability rock sample, and measuring device - Google Patents
Measuring method for permeability of low-permeability rock sample, and measuring device Download PDFInfo
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- CN103674800A CN103674800A CN201210322339.4A CN201210322339A CN103674800A CN 103674800 A CN103674800 A CN 103674800A CN 201210322339 A CN201210322339 A CN 201210322339A CN 103674800 A CN103674800 A CN 103674800A
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Abstract
The invention discloses a measuring method for the permeability of a low-permeability rock sample, and a measuring device. According to the method, the permeability can be obtained by measuring the concentration change of a measuring medium penetrating through a rock sample to be measured and helium or sulfur hexafluoride is adopted as the measuring medium. The measuring device comprises a detection gas source (1), a pressure adjusting valve (2), a pair of pressure sensors (4), a rock sample chamber (5), a constant-volume chamber (6), a gas concentration detection device (7) and a central control unit (8), wherein the detection gas source (1) is connected with the rock sample chamber (5) by the pressure adjusting valve (2); the outlet end of the rock sample chamber is connected with an inlet of the constant-volume chamber (6); the gas concentration detection device (7) is connected with the constant-volume chamber (6), and is used for detecting the concentration of gas in the constant-volume chamber (6), and the output end of the gas concentration detection device (7) is connected with the central control unit (8). The measuring method adopted by the measuring device has the advantages that the micro gas flow can be accurately measured, and the measurement for the permeability of the low-permeability rock sample such as shales, mud shales, mud rocks and compact sand rocks can be realized.
Description
Technical field
The present invention relates to a kind of measurement mechanism and measuring method thereof of rock sample permeability, particularly, the present invention relates to a kind of measurement mechanism and measuring method thereof of hyposmosis rock sample permeability.
Background technology
In geology field, measure in the process of rock sample permeability, rate-of flow is an important parameter to be measured, at existing gas method (measuring media is gas), measure in rock sample permeability, with regard to automaticity, normal use traffic meter method and artificial soap foam (film) method.
Flowmeter method: in the gas circuit of the rear end of rock sample to be measured (measuring media outlet), the one group of flowmeter that range is not of uniform size that is connected in parallel, flows through the uninterrupted after rock sample according to measuring media, selects a kind of flowmeter automatically to measure the flow of measuring media.
Artificial soap foam (film) method: in the gas circuit of the rear end of rock sample to be measured (measuring media outlet), according to measuring media, flow through the uninterrupted after rock sample, select to connect the quantity tube of a certain specification, in quantity tube one end, do a soap foam (film), according to the scale on quantity tube and soap foam (film), flow through one scale period used, the flow of computation and measurement medium.
Above-mentioned two class methods have been brought into play vital role in rock sample permeability determination process in the past, obtained good result, but the development along with oil-gas exploration and development work, particularly in unconventional petroleum resources evaluation study and cap rock research work, the test job amount of the rock samples such as shale, mud shale, mud stone, tight sand is more and more, these rock samples often have low-permeability, the feature of ultra-low penetration even, and the defect of existing permeability survey method is:
Flowmeter method: existing flowmeter detects lower limit for height, can not meet the needs of Micro airflow measurement.Although have the flowmeter that can measure small gas flow, its determination period is long.
Artificial soap foam (film) method: the one, when carrying out the low-permeability rock sample mensuration such as shale, mud shale, mud stone and tight sand, soap foam (film) movement reaches steady state (SS) often to be needed for a long time.Two operating environments have impact to soap foam (film) is mobile, easily produce measuring error.The 3rd, manual operation, timing easily produces personal error.
In a word, existing flow-measuring method is difficult to meet the needs of Micro airflow measurement, causes the hyposmosis rock sample permeability determination difficulties such as shale, mud shale, mud stone and tight sand, is starved of a kind of new method of Micro airflow measurement.
Summary of the invention
In order to solve existing permeability survey method, be difficult to measure small gas flow, cause the hyposmosis rock sample permeability determination difficulties such as shale, mud shale, mud stone and tight sand, the invention provides a kind of measuring method and measurement mechanism thereof of hyposmosis rock sample permeability, can record the permeability of hyposmosis rock sample.
The measurement mechanism of hyposmosis rock sample permeability provided by the present invention,
A measurement mechanism for hyposmosis rock sample permeability, it comprises detection source of the gas 1, pressure regulator valve 2, a pair of pressure transducer 4, rock sample chamber 5, constant volume chamber 6, gas concentration detection apparatus 7 and central control unit 8;
Described detection source of the gas 1 is connected with described rock sample chamber 5 by pressure regulator valve 2, and the endpiece of described rock sample chamber is connected with the entrance of described constant volume chamber 6; Described gas concentration detection apparatus 7 is connected with described constant volume chamber 6, for surveying the gas concentration of described constant volume chamber 6; The output terminal of described gas concentration detection apparatus 7 is connected with described central control unit 8;
Described a pair of pressure transducer 4 is separately positioned on the described porch of rock sample chamber 5 and the exit of constant volume chamber 6; And this is connected with described central control unit 8 respectively the output terminal of pressure transducer 4.
Described measurement mechanism also comprises confined pressure unit, and described confined pressure unit comprises confined pressure source of the gas 9 and confined pressure cover; Described confined pressure cover arranges in described rock sample chamber 5, and rock sample to be measured is arranged in described confined pressure cover; The output terminal of described confined pressure source of the gas 9 is connected with described rock sample chamber 5.
Between described pressure regulator valve 2 and rock sample chamber 5, be provided with gas drier 3, described gas drier 3 is vitlab drying tube.
In force, the measurement gas medium in described detection source of the gas 1 is helium or sulfur hexafluoride.
One end of described constant volume chamber 6 communicates with atmosphere and its volume is fixed; The inner wall smooth of described constant volume chamber 6.
Described central control unit is process chip or computing machine, for sensor-lodging, and analytical calculation output data;
Described gas concentration detection apparatus 7 is a kind of in SCHUTZ type infrared gas detector, LLD-100 type Laser Photoacoustic Spectroscopy gas detecting instrument or MIC-500 helium detection instrument.
Another inventive point of the present invention is exactly the measuring method that described device carries out hyposmosis rock sample permeability
Step 1, Preparatory work of experiment step:
[11] by being cooled to room temperature after rock sample oven dry, measure its length and diameter data; Manually read the atmospheric pressure data that described barometer shows; Measure the volume of described constant volume chamber 6, by the described central control unit 8 of above-mentioned each data input, and calculate the cross-sectional area of rock sample by it;
[12] described constant volume chamber 6 is communicated with atmosphere;
[13] by described detection source of the gas 1, pressure regulator valve 2, gas drier 3, constant volume chamber 6, rock sample chamber 5 and gas concentration detection apparatus 7 are connected on measurement gas path; Gas concentration detection apparatus 7 is connected with described central control unit 8;
In actual application, under the draughty condition of operating environment, step [14] is inessential step, can save.When operating environment ventilation is smooth, also comprise,
[14] detect and obtain concentration of medium background reference values:
Close under described detection source of the gas 1 condition, start described gas concentration detection apparatus 7, the concentration that described central control unit 8 gathers measuring media in constant volume chamber 6 is worth as a setting;
Step 2, detects by the concentration of medium of rock sample:
[31] confined pressure is set: rock sample to be measured is packed in the confined pressure cover of described rock sample chamber 5, connect rock sample chamber 5 and constant volume chamber 6, open confined pressure source of the gas 9, to confined pressure cover, exert pressure, make the confined pressure cover of rock sample chamber 5 brace rock sample, for avoiding measuring media to leak at rock sample and confined pressure cover contact position;
[32] by described pressure regulator valve 2, regulate the pressure of the measuring media that detects source of the gas 1 output, make it by rock sample chamber 5 and enter described constant volume chamber 6, CPU (central processing unit) 8 gather measuring media in the constant volume chamber 6 that described gas concentration detection apparatus 7 detects concentration and detection time data;
Step 3 is asked for and is obtained measuring media rate of discharge:
[41] described central control unit 8 is measuring media rate of discharge by measuring media concentration conversion;
Q
o＝△N×V/△T （1）
Wherein,
Q
ofor exit gas flow, ml/s;
△ N is the variable quantity of constant volume chamber gas concentration, ppm;
V is the volume of constant volume chamber, cm
3;
△ T is the variable quantity of time, s.
The △ N of formula (1) is in time T
1time be carved into T
2constantly during this period of time in, the variable quantity of measuring media concentration in constant volume chamber, variable quantity △ N=N
2-N
1, N
1t
1the concentration of measuring media in moment constant volume chamber, N
2t
2the concentration of measuring media in moment constant volume chamber;
Step 4 output step, described central control unit 8 is exported data.
In described step 3, also comprise [42] detection rock sample permeability step; It comprises,
[421] described a pair of pressure transducer 4 inputs to described central control unit 8 by signal, gathers measuring media at intake pressure and the top hole pressure at rock sample two ends;
[422] calculate permeability;
Permeability need to be by measuring rock sample gas feed pressure, top hole pressure, atmospheric pressure, rock sample length, cross-sectional area, gas viscosity data, and the computing formula of permeability is:
Ka=2P
0Q
0μL/△PA(2P
0+△p) （2）；
Wherein,
Ka is permeability
P
0for atmospheric pressure, its unit is MPa;
Q
0for exit gas flow, its unit is mL/s;
μ is gas viscosity, and its unit is Pas;
L is the length of described rock sample, and its unit is cm;
A is the basal area of described rock sample, and its unit is cm
2;
△ p is the pressure differential at rock sample two ends, and unit is Mpa.
In concrete steps, in described step [31], the condition that described gas concentration detection apparatus 7 gathers is: measuring media enters the gaseous tension scope of rock sample chamber at 0.1-0.2Mpa; The pressure limit 1.4-1.6Mpa that confined pressure puts; The diameter 0.2-0.5cm of pipeline between the length 10-20cm of pipeline and rock sample chamber and constant volume chamber between rock sample chamber and constant volume chamber.
Confined pressure cover applied pressure to rock sample chamber 5 in described step [31] is 1.5MPa.
The accuracy of detection of described gas concentration detection apparatus 7 and the scope of its detection should meet measurement needs, such as, the volume of constant volume chamber 6 is 10cm
3time, require the range of gas concentration detection apparatus 7 to be at least 0-1000ppm, accuracy of detection is not less than 2% of full scale.
The measurement mechanism of hyposmosis rock sample permeability of the present invention, its measuring method is mainly carried out according to following principle:
First, by complete the conversion of concentration and flow with following formula:
Q
o＝△N×V/△T （1）
Wherein,
Q
ofor exit gas flow, ml/s;
△ N is the variable quantity of constant volume chamber gas concentration, in the present invention, with ppm, represents;
V is the volume of constant volume chamber, cm
3;
△ T is the variable quantity of time, s.
The △ N of formula (1) is in time T
1time be carved into T
2constantly during this period of time in, the variable quantity of measuring media concentration in constant volume chamber, variable quantity △ N=N
2-N
1, N
1t
1the concentration of measuring media in moment constant volume chamber, N
2t
2the concentration of measuring media in moment constant volume chamber.T
1, T
2constantly definite is that the software in computing machine completes.
Above-mentioned formula (1) can be realized the conversion of concentration and flow.Afterwards, the calculating of permeability, by measuring rock sample gas feed pressure, top hole pressure, atmospheric pressure, rock sample length, cross-sectional area, gas viscosity data, finally obtains with computing permeability formula, and the computing formula of permeability of the present invention is:
Ka=2P
0Q
0μL/△PA(2P
0+△p) （2）；
Wherein,
P
0for atmospheric pressure, its unit is MPa;
Q
0for exit gas flow, its unit is mL/s;
μ is gas viscosity, and its unit is Pas;
L is the length of described rock sample, and its unit is cm;
A is the basal area of described rock sample, and its unit is cm
2;
△ p is the pressure differential at rock sample two ends, and unit is Mpa.
The measuring method that measurement mechanism of the present invention adopts can (for example, 0.0001ml/min), can realize the mensuration of the hyposmosis rock sample permeabilities such as shale, mud shale, mud stone and tight sand by the small gas flow of Measurement accuracy.
Accompanying drawing explanation
Fig. 1 is that the hypotonic rock sample permeability detector of the present invention forms schematic diagram.
Description of reference numerals:
1-detects source of the gas; 2-pressure regulator valve; 3-gas drier; 41-pressure transducer; 42-pressure transducer;
5-rock sample chamber; 6-constant volume chamber; 7-gas concentration detection apparatus; 8-central control unit; 9-confined pressure source of the gas
Embodiment
The measurement mechanism of a kind of hyposmosis rock sample permeability as shown in Figure 1, it comprises: detect source of the gas 1, pressure regulator valve 2, gas drier 3, pressure transducer 4, rock sample chamber 5, constant volume chamber 6, gas concentration detection apparatus 7, central control unit 8, as computing machine, with confined pressure source of the gas 9, wherein said detection source of the gas 1 is connected by this pressure regulator valve 2, to regulate the pressure of the measuring media of source of the gas 1 output with pressure regulator valve 2, gas drier 3 is connected with rock sample chamber 5 with pressure regulator valve 2, these 5 rear ends, rock sample chamber are connected to constant volume chamber 6, the logical atmosphere in described constant volume chamber 6, it is connected with gas concentration detection apparatus 7 to measure the concentration of these constant volume chamber 6 interior measuring media, the outlet of the entrance of this rock sample chamber 5 and this constant volume chamber 6 is respectively connected with pressure transducer 4, each pressure transducer 4 is connected with computing machine 8 with described gas concentration detection apparatus 7, rock sample chamber 5 is connected with other confined pressure source of the gas 9, source of the gas 9 is for exerting pressure to the confined pressure cover of rock chamber 5.The inner wall smooth of described constant volume chamber 6, the source of the gas 1 of described output measuring media is generally helium or sulfur hexafluoride.
The measuring method of a kind of hyposmosis rock sample permeability provided by the present invention, by measuring the concentration change of measuring media, draw gas flow, and then calculate permeability, the method mainly comprises the step of data typing, measurements and calculations, particularly, comprise the following steps:
1) will after rock sample oven dry, be cooled to room temperature, with its length of vernier caliper measurement and diameter data, manually read the atmospheric pressure data that barometer shows, measure the volume V of constant volume chamber 6, above data are entered in computing machine 8, and by computing machine 8, are calculated the cross-sectional area of rock sample;
2) the logical atmosphere in constant volume chamber 6, so that it can mix with the measuring media flowing in measuring process, is convenient to measure concentration (if the obstructed atmosphere of measuring media after mixing, instrument is airtight, along with flowing through, the measuring media of coming is more and more, and the pressure of confined space raises, and is unfavorable for detecting);
3) constant volume chamber 6, rock sample chamber 5 and gas concentration detection apparatus 7 are connected, close source of the gas 1, start gas concentration detection apparatus 7, and the concentration that gathers the measuring media in constant volume chamber 6 by computing machine 8 is worth as a setting;
4) rock sample to be measured is packed in the confined pressure cover of rock sample chamber 5, open and source of the gas 9 that rock sample chamber 5 connects, to confined pressure cover, exert pressure, make the confined pressure cover of rock sample chamber 5 pack tightly rock sample, avoid measuring media to leak at rock sample and confined pressure cover contact position, the confined pressure cover applied pressure to rock sample chamber 5 is 1.5MPa conventionally;
5) by pressure regulator valve 2, regulate the pressure of the measuring media of source of the gas 1 output, conventionally its pressure is adjusted to 0.1-0.2Mpa so that it is by rock sample chamber 5 and enter constant volume chamber 6, under the certain condition of the running parameters such as the pressure putting in the gaseous tension as measuring media, confined pressure, length of pipeline and diameter, the gas being worth as measurement in constant volume chamber 6 is (△ T, T within a certain period of time
2-T
1) the concentration amplitude (△ N, the △ N=N that rise
2-N
1) be mainly subject to this gas in impact and the control of rock sample chamber 5 rates of discharge, gas concentration detection apparatus 7 by computing machine 8 automatically gather measuring media in constant volume chamber 6 concentration data and detection time data, and by computing machine 8, measuring media concentration is scaled to measuring media rate of discharge by formula (1), meanwhile, computing machine 8 and pressure transducer 4 gather measuring media automatically at intake pressure and the top hole pressure at rock sample two ends;
6) computing machine 8 is pressed the permeability that formula (2) calculates rock sample.
In the measuring method of above-mentioned hyposmosis rock sample permeability, the source of the gas 1 of described output measuring media is generally helium or sulfur hexafluoride, and above-mentioned gas has the character of inert gas, and wherein the content of helium in atmosphere is 5ppm left and right.The described source of the gas being connected with rock sample chamber 59 is pressure-air, described pressure-air refers to the pressure-air in steel cylinder that is stored in through processing such as dewatering, the pressure conventionally with 1-20Mpa left and right, the pressure of above-mentioned air is by the regulator regulation and control on steel cylinder, and the gas with 1.5MPa pressure applies confined pressure to the confined pressure cover in rock sample chamber 5 conventionally.
Claims (11)
1. the measurement mechanism of a hyposmosis rock sample permeability, it is characterized in that, it comprises detection source of the gas (1), pressure regulator valve (2), a pair of pressure transducer (4), rock sample chamber (5), constant volume chamber (6), gas concentration detection apparatus (7) and central control unit (8);
Described detection source of the gas (1) is connected with described rock sample chamber (5) by pressure regulator valve (2), and the endpiece of described rock sample chamber is connected with the entrance of described constant volume chamber (6); Described gas concentration detection apparatus (7) is connected with described constant volume chamber (6), for surveying the gas concentration of described constant volume chamber (6); The output terminal of described gas concentration detection apparatus (7) is connected with described central control unit (8);
Described a pair of pressure transducer (4) is separately positioned on the described porch of rock sample chamber (5) and the exit of constant volume chamber (6); And this is connected with described central control unit (8) respectively the output terminal of pressure transducer (4).
2. the measurement mechanism of a kind of hyposmosis rock sample permeability according to claim 1, is characterized in that:
Described measurement mechanism also comprises confined pressure unit, and described confined pressure unit comprises confined pressure source of the gas (9) and confined pressure cover; Described confined pressure cover arranges in described rock sample chamber (5), and rock sample to be measured is arranged in described confined pressure cover; The output terminal of described confined pressure source of the gas (9) is connected with described rock sample chamber (5).
3. the measurement mechanism of a kind of hyposmosis rock sample permeability according to claim 1, is characterized in that:
Between described pressure regulator valve (2) and rock sample chamber (5), be provided with gas drier (3).
4. the measurement mechanism of a kind of hyposmosis rock sample permeability according to claim 1, is characterized in that:
Measurement gas medium in described detection source of the gas (1) is helium or sulfur hexafluoride.
5. the measurement mechanism of a kind of hyposmosis rock sample permeability according to claim 1 and 2, is characterized in that:
One end of described constant volume chamber (6) communicates with atmosphere and its volume is fixed; The inner wall smooth of described constant volume chamber (6).
6. the measurement mechanism of a kind of hyposmosis rock sample permeability according to claim 1, is characterized in that:
Described measurement mechanism also comprises gas pressure sensor, and described gas pressure sensor is connected with described central control unit; Described central control unit is process chip or computing machine, for sensor-lodging, and analytical calculation output data;
Described gas concentration detection apparatus (7) is a kind of in SCHUTZ type infrared gas detector, LLD-100 type Laser Photoacoustic Spectroscopy gas detecting instrument or MIC-500 helium detection instrument.
7. according to the device one of claim 1-6 Suo Shu, carry out the measuring method of hyposmosis rock sample permeability, it comprises the following steps:
Step 1, Preparatory work of experiment step:
[11] by being cooled to room temperature after rock sample oven dry, measure its length and diameter data; Manually read the atmospheric pressure data that barometer shows; Measure the volume of described constant volume chamber (6), by the described central control unit (8) of above-mentioned each data input, and calculate the cross-sectional area of rock sample by it;
[12] described constant volume chamber (6) is identical with atmosphere;
[13] by described detection source of the gas (1), pressure regulator valve (2), gas drier (3), constant volume chamber (6), rock sample chamber (5) and gas concentration detection apparatus (7) are connected on measurement gas path; Gas concentration detection apparatus (7) is connected with described central control unit (8);
Step 2, detects by the concentration of medium of rock sample:
[31] confined pressure is set: rock sample to be measured is packed in the confined pressure cover of described rock sample chamber (5), connect rock sample chamber (5) and constant volume chamber (6), open confined pressure source of the gas (9), to confined pressure cover, exert pressure, make the confined pressure cover of rock sample chamber (5) brace rock sample, for avoiding measuring media to leak at rock sample and confined pressure cover contact position;
[32] by described pressure regulator valve (2), regulate the pressure of the measuring media that detects source of the gas (1) output, make it pass through rock sample chamber (5) and enter described constant volume chamber (6), CPU (central processing unit) (8) gathers the concentration of the middle measuring media in constant volume chamber (6) and data detection time of correspondence that described gas concentration detection apparatus (7) collects;
Step 3 is asked for and is obtained measuring media rate of discharge:
[41] described central control unit (8) is measuring media rate of discharge by measuring media concentration conversion;
Q
o＝△N×V/△T（1）
Wherein,
Q
ofor exit gas flow, ml/s;
△ N is the variable quantity of constant volume chamber gas concentration, ppm;
V is the volume of constant volume chamber, cm
3;
△ T is the variable quantity of time, s.
The △ N of formula (1) is in time T
1time be carved into T
2constantly during this period of time in, the variable quantity of measuring media concentration in constant volume chamber, variable quantity △ N=N
2-N
1, N
1t
1the concentration of measuring media in moment constant volume chamber, N
2t
2the concentration of measuring media in moment constant volume chamber;
Step 4 output step, described central control unit (8) is exported data.
8. measuring method of carrying out hyposmosis rock sample permeability according to claim 7, is characterized in that: in described step 3, also comprise [42] detection rock sample permeability step; It comprises,
[421] described a pair of pressure transducer (4) inputs to described central control unit (8) by signal, gathers measuring media at intake pressure and the top hole pressure at rock sample two ends;
[422] calculate permeability;
Permeability need to be by measuring rock sample gas feed pressure, top hole pressure, atmospheric pressure, rock sample length, cross-sectional area, gas viscosity data, and the computing formula of permeability is:
Ka=2P
0Q
0μL/△PA(2P
0+△p) （2）；
Wherein,
Ka is permeability
P
0for atmospheric pressure, its unit is MPa;
Q
0for exit gas flow, its unit is mL/s;
μ is gas viscosity, and its unit is Pas;
L is the length of described rock sample, and its unit is cm;
A is the basal area of described rock sample, and its unit is cm
2;
△ p is the pressure differential at rock sample two ends, and unit is Mpa.
9. measuring method of carrying out hyposmosis rock sample permeability according to claim 7, is characterized in that:
In described step 1, also comprise,
[14], detect and obtain concentration of medium background reference values:
Close under described detection source of the gas 1 condition, start described gas concentration detection apparatus 7, the concentration that described central control unit 8 gathers measuring media in constant volume chamber 6 is worth as a setting.
10. measuring method of carrying out hyposmosis rock sample permeability according to claim 7, is characterized in that:
In described step [31], the condition that described gas concentration detection apparatus (7) gathers is: measuring media enters the gaseous tension scope of rock sample chamber (5) at 0.1-0.2Mpa; The pressure limit 1.4-1.6Mpa that confined pressure puts; The diameter 0.2-0.5cm of pipeline between the length 10-20cm of pipeline and rock sample chamber and constant volume chamber between described rock sample chamber and constant volume chamber.
11. according to the measuring method of a kind of hyposmosis rock sample permeability described in claim 7 or 10, it is characterized in that:
Confined pressure cover applied pressure to rock sample chamber (5) in described step [31] is 1.5MPa.
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| CN105717026A (en) * | 2016-04-01 | 2016-06-29 | 河南理工大学 | Coal rock permeability experiment system with adjustable outlet pressure as well as method |
| CN109975169A (en) * | 2017-12-28 | 2019-07-05 | 核工业北京地质研究院 | A kind of country rock gas permeability coefficient test method |
| CN110455694A (en) * | 2018-05-08 | 2019-11-15 | 中国石油天然气股份有限公司 | A kind of rock sample permeability determination method |
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| CN105372166A (en) * | 2014-08-26 | 2016-03-02 | 中国石油天然气股份有限公司 | Method and device for obtaining permeability of argillaceous sandstone |
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| CN105628578A (en) * | 2015-12-21 | 2016-06-01 | 中国石油大学(北京) | Device for evaluating water blocking and releasing properties of core |
| CN105717026A (en) * | 2016-04-01 | 2016-06-29 | 河南理工大学 | Coal rock permeability experiment system with adjustable outlet pressure as well as method |
| CN109975169A (en) * | 2017-12-28 | 2019-07-05 | 核工业北京地质研究院 | A kind of country rock gas permeability coefficient test method |
| CN110455694A (en) * | 2018-05-08 | 2019-11-15 | 中国石油天然气股份有限公司 | A kind of rock sample permeability determination method |
| CN110455694B (en) * | 2018-05-08 | 2022-03-29 | 中国石油天然气股份有限公司 | Rock sample permeability determination method |
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