CN104897525B - The test system and method for diffusion coefficient and isothermal adsorption/desorption curve - Google Patents

The test system and method for diffusion coefficient and isothermal adsorption/desorption curve Download PDF

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CN104897525B
CN104897525B CN201410075251.6A CN201410075251A CN104897525B CN 104897525 B CN104897525 B CN 104897525B CN 201410075251 A CN201410075251 A CN 201410075251A CN 104897525 B CN104897525 B CN 104897525B
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gas
pressure
holding unit
core holding
valve
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CN201410075251.6A
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CN104897525A (en
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赵春鹏
伦增珉
吕成远
王卫红
潘伟义
王海涛
刘华
王锐
周霞
骆铭
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中国石油化工股份有限公司
中国石油化工股份有限公司石油勘探开发研究院
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Abstract

The invention discloses the test system and method for a kind of diffusion coefficient for shale gas and isothermal adsorption/desorption curve, the test system includes:Core holding unit, the rock core to be measured that middle part is accommodated separates two ends to form two gas diffusion chambers;Confined pressure component, is connected with core holding unit, for substituting strata pressure to rock core loading confined pressure;Two gas containers equipped with gas with various, for the insufflation gas into the gas diffusion chamber at core holding unit two ends respectively;Pressurizer, is connected to balance the pressure of two gas diffusion chambers with core holding unit;Insulating box, for keeping the temperature of core holding unit, gas container and pressurizer constant;With collection and test suite, to test diffusion coefficient is obtained and pressure in the same time does not obtain isothermal adsorption/desorption data curve by collection for gathering the gas at rock core two ends of different time.The test system has saved equipment cost.

Description

The test system and method for diffusion coefficient and isothermal adsorption/desorption curve

Technical field

The present invention relates to the studying technological domain of the migration mechanism of shale gas, and in particular to a kind of diffusion for shale gas The test system and method for coefficient and isothermal adsorption/desorption curve.

Background technology

Shale gas refers to mined natural gas from rammell.Shale gas is a kind of important unconventional resource, entirely The shale gas resource of ball is about 456 tcms.The stock number of wherein Chinese Main Basins and regional shale gas is about 150,000 Hundred million -30 tcms, with huge potentiality to be exploited.

Shale permeability is extremely low, and shale gas migration mechanism is also different from conventional gas, with desorption and diffusion characteristic.Page Rock gas development features and gas migration mechanism are closely related, therefore diffusion and the research of adsorption/desorption feature are always shale gas The focus of research field.At present generally using Physical Experiment means research diffusion and adsorption/desorption feature.

Mainly there is the method for two kinds of measure diffusion coefficients at present:1. single gas method.Sample is put into after diffuser casing and injects test Gas, then converses change in concentration, and then calculate diffusion coefficient according to pressure change.2. double gas methods.Sample is put into rock core After in clamper, make two kinds of gas pressures at sample two ends equal, diffusion occurs in the presence of concentration difference and makees for two ends gas With, the detection not concentration of component of two ends gas in the same time, diffusion coefficient is calculated according to Fick's law.Isothermal adsorption/desorption curve Test generally have two methods at present:1. volumetric method.Pressure becomes before and after prior art uses particulate samples, test sample balance Change, and then calculate adsorbance and desorption quantity.2. gravimetric method.Using magnetic suspension balance, under different test pressures, record is adsorbed The sample quality of gas, and then calculate absorption tolerance.

Prior art is tested diffusion coefficient and isothermal adsorption/desorption properties using different experimental provisions, equipment Input cost is higher.Isothermal adsorption/Desorption characteristics test uses powdered samples more, it is impossible to reflect granular cementation state and stress Influence of the field to test result.Minor diameter rock core being used diffusion coefficients, it is impossible to reflect reservoir heterogeneity well more.Separately When the outer double gas methods of use are diffused coefficient test, rock core pressure at two ends is difficult to avoid that when diffuser casing gas injection equilibrium process and sampling Fluctuate the influence to diffusion.

The content of the invention

A technical problem to be solved by this invention is to provide the diffusion coefficient and isothermal adsorption/solution of a kind of shale gas The test system of curve is inhaled, it can be used not only for the diffusion coefficient for determining shale gas, and can carry out isothermal adsorption/desorption curve Test, so as to save equipment cost.

Technical solution for the problem is to provide a kind of diffusion coefficient and isothermal with following structure shale gas Adsorption/desorption test system, including:

Core holding unit, its middle part accommodates rock core to be measured and separates two ends to form two gas diffusion chambers;

Confined pressure component, is connected with core holding unit, for substituting strata pressure to rock core loading confined pressure;

Two gas containers equipped with gas with various, for being filled respectively into the gas diffusion chamber at core holding unit two ends Enter gas;

Pressurizer, is set up in parallel to balance the pressure of two gas diffusion chambers with core holding unit;

Insulating box, for keeping the temperature of core holding unit, gas container and pressurizer constant;With

Collection and test suite, for gather different time rock core two ends gas with test obtain diffusion coefficient and Isothermal adsorption/desorption data curve is obtained by the pressure of collection not in the same time.

Compared with prior art, test system of the invention has advantages below.The test system of the present invention can not only be used In the diffusion coefficient of measure shale gas, and the test of isothermal adsorption/desorption curve can be carried out, so as to save equipment cost. And actual conditions can preferably be reacted as sample to be tested using block, not limit diameter rock core.In addition, by increasing Pressurization force equalizer, during the pressure at rock core two ends reaches balance, will not produce big pressure oscillation, so as to reduce pressure Influence of the fluctuation to gas diffusion.

In one embodiment, the pressurizer includes cylinder body and piston, and piston, which is located in cylinder body, separates cylinder body Into two chambers;The pressurizer is connected side by side with core holding unit, and the two ends chamber of its pressurizer passes through pipeline It is corresponding to two gas diffusion chambers of core holding unit respectively to connect, rock is made by the movement of piston under pressure differential effect Two gas diffusion chamber pressures of heart clamp holder are equal.After two gas diffusion chamber insufflation gas, easily there is pressure not Equal or fluctuation is larger.Because the gas pressure of two gas diffusion chambers is unequal or fluctuation has larger shadow to test result Ring.Therefore, in the present invention, by the structure of design pressure balancer, the gas on pressurizer and connecting line is passed through Body is adjusted come the pressure to two gas diffusion chambers so that the pressure of two gas diffusion chambers is not producing big ripple On the premise of dynamic, it is always maintained at equal.So as to solve the rock core in gas injection equilibrium process and the sampling of diffuser casing well The problem of pressure at two ends fluctuation produces large effect to gas diffusion.Thus, test result is more accurate.

In a preferred embodiment, the test suite includes the pressure sensing of gas chromatograph and connection controller Device, wherein, gas chromatograph obtains diffusion coefficient by obtaining gas component content in different time sampling to calculate;And pressure Sensor is by gathering the corresponding pressure of different time and sending controller to obtain isothermal adsorption/desorption data curve.It is former Reason and structure are relatively simple, easily realize.

In one embodiment, two gas containers are respectively first gas container and second gas container;Wherein, first Gas container connects one end of core holding unit by pipeline and the first valve, and second gas container passes through pipeline and the second valve Connect the other end of core holding unit.Control two gas containers and two gas diffusion chambers respectively by two valves Connection coordinates with closing and realizes and realize diffusion coefficients and isothermal adsorption/desorption curve respectively in a set of test system Test.Equipment investment cost is saved.

In a preferred embodiment, one end of the pressurizer by the 3rd valve and be located at the first valve and Pipeline connection between one end of core holding unit;The other end of the pressurizer is by the 4th valve and is located at the second valve Pipeline connection between door and the other end of core holding unit.The two ends chamber of pressurizer respectively with two gas diffusion chambers Room is connected, so as to move to adjust the pressure of two gas diffusion chambers by the piston of pressurizer.

In one embodiment, described two gas containers connect the first gas cylinder equipped with hydrocarbon gas and equipped with nitrogen respectively Second gas cylinder of gas.First gas cylinder conveys hydrocarbon gas and nitrogen, control two to corresponding gas container respectively with the second gas cylinder The pressure of gas container is equal.

The invention solves the problems that another technical problem be to provide it is a kind of determine shale gas diffusion coefficient method, its Obtained diffusion coefficient is tested closer to actual conditions.

For the technical problem there is provided technical solution be to provide it is a kind of determine shale gas diffusion coefficient side Method, it uses above-mentioned test system, and comprises the following steps:

1)Rock core is put into after core holding unit and loads confined pressure, the temperature of regulating thermostatic case to setting value;And to two skies Gas container and its connecting line between vavuum pump vacuumized;

2)After vacuum terminates, nitrogen and hydrocarbon gas are filled with respectively into two empty gas containers, regulation makes The pressure of two gas containers keeps equal and reaches setting pressure, loads confined pressure to setting confined pressure value;

3)The valve of the valve and pressurizer at rock core two ends is opened after the gas pressure in two gas containers is stable, Gas in two gas containers is filled with the gas diffusion chamber at rock core two ends respectively;

4)The valve closed between two gas containers and pressurizer, then not in the same time from the gas diffusion at two ends Chamber is sampled, using the component and its concentration of chromatographic gaseous sample, and progress, which is calculated, obtains diffusion coefficient.

In above-mentioned steps, the gas diffusion chamber of rock core one end is equipped with hydrocarbon gas, and it is diffused into another by rock core The gas diffusion chamber at end, the gas diffusion chamber of the rock core other end is diffused into equipped with nitrogen, and it is originally hydro carbons gas that it, which is diffused into, The gas diffusion chamber of body, by the survey that composition and concentration are carried out in the sample for not extracting two gas diffusion chambers in the same time Examination, obtains the diffusion coefficient of hydrocarbon gas and nitrogen in the rock core, diffusion coefficient has reacted the speed of the diffusion velocity of gas.Root Diffusion coefficient is calculated according to Fick's law, it is not reinflated herein to illustrate.

Preferably, in step 4)In, gas chromatograph is clamped by the first sampling valve and the second sampling valve to rock core respectively The gas diffusion chamber at device two ends is sampled with the pipeline of chamber.Two gases are expanded respectively by two sampling valves Scattered chamber is sampled and analyzed.Two ends are separately sampled respectively, it is not easy to malfunctioned.

The invention solves the problems that also have technical problem to be to provide isothermal adsorption/desorption curve of shale gas a kind of Method of testing, its is simple to operate, and test result is closer to actual conditions.

For the technical problem there is provided technical solution be to provide isothermal adsorption/desorption curve of shale gas a kind of Method of testing, it uses above-mentioned test system, and comprises the following steps:

1)Rock core is put into after core holding unit and loads confined pressure, the temperature of regulating thermostatic case to setting value;To empty gas Container and its connecting line between vavuum pump are vacuumized;

2)Hydrocarbon gas, regulation pressure to the first absorption setting pressure, pressure are filled with gas container to after vacuumizing The valve between the gas container and core holding unit is opened after balance, gas enters a gas diffusion chamber of core holding unit Room, record pressure value after pressure stabilisation,

3)The valve closed between gas container and core holding unit;Pressure in regulation gas container is set to next absorption Constant-pressure, repeat step 2)Until last setup pressure value;

4)The gas absorption amount under each absorption setting pressure is calculated, isothermal adsorption test is completed;

5)The valve closed between gas container and core holding unit, the first desorption setting pressure is deflated to gas container Power, opens the valve between gas container and core holding unit, the corresponding pressure value of record after pressure stabilisation after pressure balance;

6)The valve closed between gas container and core holding unit, next desorption setting pressure is deflated to gas container Power, repeat step 5)Until last desorption setting pressure;

7)The gas desorption amount under each desorption setting pressure is calculated, desorption test is completed.

In the method for testing of isothermal adsorption/desorption curve of above shale gas, adsorbance and desorption quantity computational methods are with holding Amount method is consistent, not reinflated herein to illustrate.

Preferably, in step 1)In, if before vacuumizing, there is gas in gas container, first the gas in gas container is entered Vacuumized again after row processing.Gas in gas container is likely to be can cause the gas of corrosion to the vavuum pump vacuumized, first The service life for being conducive to extending vavuum pump is vacuumized after handling the gas in gas container again, testing cost is reduced.

Brief description of the drawings

It is that the diffusion coefficient of the present invention and a kind of the of test system of isothermal adsorption/desorption curve are embodied shown in Fig. 1 Example.

It is a kind of concrete structure of the pressurizer in the test system in Fig. 1 shown in Fig. 2.

Embodiment

The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.

Diffusion coefficient as shown in Figure 1 for the present invention and a kind of specific reality of the test system of isothermal adsorption/desorption curve Apply example.In this embodiment, the test system is put down including core holding unit 6, confined pressure component, two gas containers 4 and 5, pressure Weighing apparatus 7, gas chromatograph 9, insulating box 8, pressure sensor 11 and vavuum pump 1.The core holding unit 6 clamps for full-hole core Device, installs rock core two ends after core sample and leaves volume for 20~40cm3Cavity be used as gas diffusion chamber.Core holding unit 6 are connected with confined pressure component by pipeline, and the confined pressure component includes confined pressure pump 10 and be located on the pipeline that the pressure of pressure can be gathered Sensor 13.Confined pressure pump 10 is that core sample sets different size of confined pressure according to test request.

Vavuum pump 1 connects first gas container 4 through main line and the first branch pipe, and main line is provided with valve 14.Main line With being also associated with three branch pipes at the first tie point of the first branch pipe.Wherein Article 2 branch pipe connects gas cylinder 2, the place of gas cylinder 2 First branch pipe is provided with switch valve 17 and pressure regulator valve 16, and gas cylinder 2 is used to inflate to first gas container 4.Article 3 branch pipe is connected Second gas container 5.Article 4 branch pipe connects gas cylinder 3, and gas cylinder 3 is used to inflate to second gas container 5.Article 3 branch pipe and Four branch pipes have one section of common pall before the second tie point.Article 3 branch pipe and Article 4 branch pipe are punished in the second tie point Open, the pressure sensor 12 for being used for gathering pressure is provided with the second tie point.Between the first tie point and the second tie point Common pall is provided with valve 18.It is connected with common pall, between the first tie point and valve 18 for gathering pressure Pressure sensor 11.Gas cylinder 3 is connected with switch valve 20 and pressure regulator valve 19.Pipe of first pipeline between tie point and valve 14 Road is also drawn for the blowdown piping to first gas container 4 and/or the deflation of second gas container 5, and blowdown piping is provided with and put Empty valve 15.

When vacuumizing, valve 14 and valve 18 are opened, remaining valve is closed.

In the present embodiment, as shown in Fig. 2 pressurizer 7 is low frictional resistance piston type pressure balancer.It includes cylinder body 7.2 and piston 7.4, piston 7.4 is located in cylinder body 7.2 to be connected by the inwall movable sealing of sealing ring 7.3 and 7.5 and cylinder body 7.2 Connect cylinder body 7.2 being separated into two chambers.The two chambers of pressurizer 7 are respectively by being located at the joint 7.1 at two ends It is connected with 7.6 with pipeline.In Fig. 1, the pressurizer 7 is set up in parallel with core holding unit 6.That is the two of pressurizer 7 End chamber is connected by the way that valve 21 and valve 22 are corresponding to two gas diffusion chambers of core holding unit 6 respectively, in pressure Make two gas diffusion chamber pressures of core holding unit 6 equal by the movement of piston under difference effect.

In preferred embodiment, pressurizer 7 have it is pressure-resistant it is higher, to the sensitive characteristic of pressure difference.Using double gas When method determines diffusion coefficient, when causing the pressure at rock core two ends unequal to the gas injection of gas diffusion chamber or sampling, piston meeting Automatically from high pressure to low pressure movement until pressure balance.For example, when valve 21, valve 22, valve 23 and the unlatching of valve 24, remaining Valve is closed, and the gas of first gas container 4 and second gas container 5 is respectively to two gas diffusion chambers of core holding unit 6 Room gas injection, if the corresponding one end of pressurizer 7 of valve 21(That is the left end in Fig. 1)Pressure is big, and piston is under pressure differential effect Move to right, the gas on the right side of compression so that the pressure reduction in left side, the gas pressure increase on right side, the two of final core holding unit 6 Pressure in individual gas diffusion chamber reaches equal.That is, due to there is the presence of pressurizer 7 so that entirely surveying The pressure at rock core two ends remains equal during examination, thus avoids influence of the pressure difference to diffusion coefficients.

In addition, during test experiments, first gas container 4, second gas container 5, pressurizer 7 and rock core clamping Device 6 is in incubator 8.Incubator 8 can provide different test temperatures, can be required to set according to test experiments, so that more true Actual reservoir condition is simulated on the spot.

Preferably, pressure sensor 11,12 and 13 uses high-precision pressure sensor.It is used for collecting test experiment During pressure size, and pressure change is recorded by the controller of connection in real time.

Gas chromatograph 9, which is used to determine, passes through two gas diffusions of sampling valve 25 or sampling valve 26 from core holding unit 6 The composition and concentration for the gaseous sample that sampling is obtained in chamber.Sampling valve 25 or sampling valve 26 also can from two gas diffusion chambers Sampled on the pipeline of room connection.

In addition, pressurizer 7 is when being diffused coefficient determination, the pressure of stable nitrogen and hydrocarbon gas is primarily served Effect.But, pressurizer 7 does not work in the test of isothermal adsorption/desorption curve, therefore in isothermal adsorption/solution Inhale valve 21 and valve 22 in the test process of curve and be constantly in closed mode.

The invention additionally relates to a kind of method for the diffusion coefficient for determining shale gas, it uses the test system of the present invention, And comprise the following steps:

1)Rock core is put into after core holding unit 6 confined pressure, such as 3MPa are loaded to rock core by confined pressure pump 10.Regulating thermostatic The temperature of case 8 is to setting value;Valve 14 and 18 is opened, the test system is vacuumized.

2)After vacuum terminates, valve 14 and 18 is closed;Open switch valve 17 and pressure regulator valve 16, gas cylinder 2 to first Gas container 4 is inflated;Switch valve 20 and pressure regulator valve 19 are opened, gas cylinder 3 is inflated to second gas container 5.Wherein, gas cylinder 2 is equipped with Hydrocarbon gas(Such as methane), nitrogen is housed in gas 3.In gas replenishment process, regulation makes the pressure of two gas containers 4 and 5 keep phase Deng and reach setting pressure, then load confined pressure to setting confined pressure value.

3)The valve 21,22,23 and 24 at rock core two ends, two are opened after the gas pressure in two gas containers 4 and 5 is stable Gas in gas container 4 and 5 is filled with the gas diffusion chamber at rock core two ends respectively;Balance device for submersible electric 7 is sent out in gas replenishment process Wave the effect of balance pressure at two ends.

4)Valve 23 and 24 is closed, then by sampling valve 25 and 26 respectively not in the same time from the gas diffusion chamber at two ends Room is sampled, and by being analyzed with the gas chromatograph 9 that sampling valve 25 is connected with 26 component and concentration of gaseous sample, and Calculated according to the Fick's law of existing pair of gas method and obtain diffusion coefficient.Complete the measure of the diffusion coefficient of shale gas.

In the present embodiment, the diffusion coefficient for determining shale gas uses methane and nitrogen, also can be according to actual needs Other gases are selected to be measured.

The invention further relates to a kind of method of testing of isothermal adsorption/desorption curve of shale gas, it uses the survey of the present invention Test system, and comprise the following steps:

1)Rock core is put into core holding unit 6, the temperature of regulating thermostatic case 8 loads confined pressure to setting value to setting value;Beat Valve opening 14 and 18 pairs of test systems of door are vacuumized;

2)Hydrocarbon gas is filled with gas container 4 to after vacuumizing(Such as methane), adjust pressure and set to the first absorption Constant-pressure, opens 23 valves, and the gas of gas container 4 enters the left gas diffusion chamber of core holding unit 6, treats pressure stability After record pressure value;

3)The pressure closed in valve 23, regulation gas container 4 sets pressure, repeat step 2 to next absorption)Until most Latter setup pressure value;

4)The formula tested according to existing isothermal adsorption calculates the gas absorption amount under each absorption setting pressure, completes isothermal Absorption test;

5)Valve 23 is closed, the first desorption setting pressure is deflated to gas container 4, valve 23 is then opened, treats pressure Corresponding pressure value is recorded after stable;

6)Valve 23 is closed, next desorption setting pressure, repeat step 5 are deflated to gas container)Until last Desorption setting pressure;

7)The gas desorption amount under each desorption setting pressure is calculated, desorption test is completed.

In above-mentioned isothermal adsorption/desorption curve test, volumetric method is used.Wherein, the pressure of gas container 4 is by pressing Force snesor 11 is gathered.

It can also be carried out in addition, isothermal adsorption/desorption curve is tested after the completion of diffusion coefficients, now gas container 4 Inside it is stored with hydrocarbon gas.Before vacuumizing, atmospheric valve 15 is first opened to being vacuumized again after the deflation post processing of gas container 4.

Although invention has been described in conjunction with specific embodiments, it being understood, however, that do not departing from the present invention Scope in the case of, various improvement or replacement can be carried out to it.Especially, as long as in the absence of the conflict in structure, each reality Applying the feature in example can be combined with each other, and the combined type feature formed is still fallen within the scope of the present invention.The present invention is simultaneously It is not limited to specific embodiment disclosed herein, but all technical schemes including falling within the scope of the appended claims.

Claims (10)

1. the diffusion coefficient and isothermal adsorption of a kind of shale gas/desorption test system, including:
Core holding unit, the rock core to be measured that its middle part is accommodated separates two ends to form two gas diffusion chambers;
Confined pressure component, is connected with core holding unit, for substituting strata pressure to rock core loading confined pressure;
Two gas containers equipped with gas with various, for being filled with gas into the gas diffusion chamber at core holding unit two ends respectively Body;
Pressurizer, is connected to balance the pressure of two gas diffusion chambers with core holding unit;The pressure balance Device is connected side by side with core holding unit;
Insulating box, for keeping the temperature of core holding unit, gas container and pressurizer constant;With
Collection and test suite, obtain diffusion coefficient and pass through for gathering the gas at rock core two ends of different time to test The pressure of collection not in the same time obtains isothermal adsorption/desorption data curve.
2. system according to claim 1, it is characterised in that the pressurizer includes cylinder body and piston, piston is set Cylinder body is separated into two chambers in cylinder body;The pressurizer is connected side by side with core holding unit, wherein pressure balance The two ends chamber of device is corresponding to two gas diffusion chambers of core holding unit respectively by pipeline to be connected, under pressure differential effect Make two gas diffusion chamber pressures of core holding unit equal by the movement of piston.
3. system according to claim 1, it is characterised in that the test suite includes gas chromatograph and connection is controlled The pressure sensor of device, wherein, gas chromatograph is expanded by obtaining gas component content in different time sampling with calculating Dissipate coefficient;And pressure sensor by gathering the corresponding pressure of different time and sending controller to obtain isothermal adsorption/solution Inhale data and curves.
4. according to system according to any one of claims 1 to 3, it is characterised in that two gas containers are respectively the first gas Body container and second gas container;Wherein, first gas container connects one end of core holding unit by pipeline and the first valve, Second gas container connects the other end of core holding unit by pipeline and the second valve.
5. system according to claim 4, it is characterised in that one end of the pressurizer is by the 3rd valve with setting Pipeline connection between the first valve and one end of core holding unit;The other end of the pressurizer passes through the 4th valve With the pipeline connection being located between the second valve and the other end of core holding unit.
6. system according to claim 1, it is characterised in that described two gas containers are connected equipped with hydrocarbon gas respectively The first gas cylinder and the second gas cylinder equipped with nitrogen.
7. a kind of method for the diffusion coefficient for determining shale gas, using test system according to any one of claims 1 to 6, And comprise the following steps:
1) rock core is put into after core holding unit and loads confined pressure, the temperature of regulating thermostatic case to setting value;And to two empty gas Body container and its connecting line between vavuum pump are vacuumized;
2) after vacuum terminates, nitrogen and hydrocarbon gas are filled with respectively into two empty gas containers, regulation makes two gas The pressure of body container keeps equal and reaches setting pressure, loads confined pressure to setting confined pressure value;
3) valve of the valve and pressurizer at rock core two ends, two gas are opened after the gas pressure in two gas containers is stable Gas in body container is filled with the gas diffusion chamber at rock core two ends respectively;
4) valve closed between two gas containers and pressurizer, then not in the same time from the gas diffusion chamber at two ends Sampling, using the component and concentration of chromatographic gaseous sample, progress, which is calculated, obtains diffusion coefficient.
8. method according to claim 7, it is characterised in that step 4) in, gas chromatograph passes through the first sampling respectively Valve and the second sampling valve take to the gas diffusion chamber at core holding unit two ends or with the pipeline of gas diffusion chamber Sample.
9. the method for testing of isothermal adsorption/desorption curve of a kind of shale gas, using according to any one of claims 1 to 6 Test system, and comprise the following steps:
1) rock core is put into after core holding unit and loads confined pressure, the temperature of regulating thermostatic case to setting value;To empty gas container And its connecting line between vavuum pump is vacuumized;
2) hydrocarbon gas, regulation pressure to the first absorption setting pressure, pressure balance are filled with the gas container to after vacuumizing The valve between the gas container and core holding unit is opened afterwards, and gas enters a gas diffusion chamber of core holding unit, Record pressure value after pressure stabilisation;
3) pressure in the valve closed between gas container and core holding unit, regulation gas container is pressed to next absorption setting Power, repeat step 2) until last setup pressure value;
4) the gas absorption amount under each absorption setting pressure is calculated, isothermal adsorption test is completed;
5) valve closed between gas container and core holding unit, the first desorption setting pressure, pressure are deflated to gas container The valve between gas container and core holding unit, the corresponding pressure value of record after pressure stabilisation are opened after dynamic balance;
6) valve closed between gas container and core holding unit, next desorption setting pressure, weight are deflated to gas container Multiple step 5) until last desorption setting pressure;
7) the gas desorption amount under each desorption setting pressure is calculated, desorption test is completed.
10. method according to claim 9, it is characterised in that in step 1) in, if before vacuumizing, having in gas container Gas, is vacuumized again after first handling the gas in gas container.
CN201410075251.6A 2014-03-03 2014-03-03 The test system and method for diffusion coefficient and isothermal adsorption/desorption curve CN104897525B (en)

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