CN106066291A - CO2displacement shale gas and shale are to shale gas or CO2absorption analytic simulation test System and method for - Google Patents

CO2displacement shale gas and shale are to shale gas or CO2absorption analytic simulation test System and method for Download PDF

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Publication number
CN106066291A
CN106066291A CN201610425861.3A CN201610425861A CN106066291A CN 106066291 A CN106066291 A CN 106066291A CN 201610425861 A CN201610425861 A CN 201610425861A CN 106066291 A CN106066291 A CN 106066291A
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valve
gas
shale
pressure
displacement
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CN106066291B (en
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张健
郜时旺
张国祥
荆铁亚
王金意
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CHINA HUANENG GROUP
Huaneng Clean Energy Research Institute
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CHINA HUANENG GROUP
Huaneng Clean Energy Research Institute
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N7/00Analysing materials by measuring the pressure or volume of a gas or vapour
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3504Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N7/00Analysing materials by measuring the pressure or volume of a gas or vapour
    • G01N7/02Analysing materials by measuring the pressure or volume of a gas or vapour by absorption, adsorption, or combustion of components and measurement of the change in pressure or volume of the remainder
    • G01N7/04Analysing materials by measuring the pressure or volume of a gas or vapour by absorption, adsorption, or combustion of components and measurement of the change in pressure or volume of the remainder by absorption or adsorption alone

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  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

A kind of CO2Displacement shale gas and shale are to shale gas or CO2Absorption analytic simulation test system, including CO2Gas cylinder and CH4Gas cylinder, CO2Gas cylinder and CH4Gas cylinder connects first piston container and the input of the second piston container respectively, the power drive end of first piston container and the second piston container is connected with power-driven system, outfan is connected to the input of fill out sand tube, and it is provided with vacuum pump and calibration system connecting on pipeline, fill out sand tube is placed in calorstat, and being connected with axial compression pump, outfan is connected to tail gas recycle bottle, and arranges back pressure control system and infrared gas analyzer on pipeline;Present invention also offers method based on this system, can simulate and test the CO of different conditions2Replacement result to shale gas under different temperatures, pressure condition;This experimental provision can also be utilized to carry out shale to CH simultaneously4Or CO2Absorption, resolve experiment, research shale gas absorption under different temperatures, pressure condition, resolve rule.

Description

CO2Displacement shale gas and shale are to shale gas or CO2Absorption analytic simulation test system System and method
Technical field
The invention belongs to Oil-Gas Field Development Engineering technical field, particularly to a kind of CO2Displacement shale gas and shale are to page Rock gas (main component CH4) or CO2Absorption analytic simulation test System and method for
Background technology
China's shale gas resource is the abundantest, and the Efficient Development of shale gas is to alleviating China's energy supply and demand contradiction meaning weight Greatly, owing to shale gas has the feature of low porosity and low permeability, exploitation shale gas must carry out reservoir fracturing.Therefore, the selection of fracturing fluid Most important.Successfully exploit the experience of shale gas according to the U.S., mainly use hydraulic fracturing technology, but this technology needs to consume greatly Amount water resource and also seriously polluted.
Either CO2Pressure break shale reservoir, or CO2Displacement shale gas, all can have CO2Displacement this phenomenon of shale gas, because of This, CO2Displacement shale gas is one of current study hotspot both domestic and external as a kind of new technique developing shale gas.CO2Displaced page Rock gas has three advantage: CO in principle2Can displacement sorption CH on shale4;CO2It is higher than CH with the adsorption strength of shale4; CO2Rammell will not be made to produce clay swell, meanwhile, it is possible to achieve part CO2Bury in underground, it is achieved greenhouse gases subtract Row, minimizing hydraulic fracturing technology, to environment, contributes to environmental protection, and advantage technically and economically determines that it will become The new technique of following shale gas Efficient Development.
But, at present about CO2The testing research of displacement methane has some deficiency following, first, simulation test CO2With rock The device of masonry is mainly used in test adsorption isotherm or adsorption isotherm process more, tests CO2Displacement CH4Device pole Few;Secondly, CO2Displacement CH4Technology is more for coal petrography, few for shale;Finally, only CO2Displacement CH4Device institute The gas measurement device used can not realize the real-time monitoring to replacement result.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, it is an object of the invention to provide a kind of CO2Displacement shale gas and page Rock is to shale gas (main component CH4) or CO2Absorption analytic simulation test System and method for, can with real-time Simulation and test not CO with state2Replacement result to shale gas under different temperatures, pressure condition.This experimental provision can also be utilized to enter simultaneously Row shale core is to shale gas or CO2Absorption, resolve experiment, study shale core gas under different temperatures, pressure condition Body absorption, parsing rule.
To achieve these goals, the technical solution used in the present invention is:
A kind of CO2Displacement shale gas and shale are to shale gas or CO2Absorption analytic simulation test system, including CO2Gas cylinder 9 and CH4Gas cylinder 17, CO2The port of export of gas cylinder 9 is connected to first piston container 7, CH4The port of export of gas cylinder 17 is connected to second and lives Plug container 15, the power drive end of first piston container 7 and the second piston container 15 is all connected with hydraulic pressure power-driven system 57, defeated Go out the input of the fill out sand tube 41 that end is all connected with being placed in calorstat 40 and on connecting line, be provided with vacuum pump 25 and mark Determining system 58, the outfan of fill out sand tube 41 connects tail gas recycle bottle 56, and is provided with infrared gas analyser on connecting line 54 and back pressure control system 59.
Described CO2Gas cylinder 9 is sequentially connected with first booster pump the 10, second relief valve the 11, second pressure transducer the 12, the 3rd valve 8, first piston container 7 and the 4th valve 13, the outlet of the 4th valve 13 connects the 7th valve 21 and first-class gauge 22;
Described CH4Gas cylinder 17 is sequentially connected with the second booster pump the 18, the 3rd relief valve the 19, the 3rd pressure transducer the 20, the 6th Valve the 16, second piston container 15 and the 7th valve 21, the outlet of the 7th valve 21 connects the 4th valve 13 and first-class gauge 22;
It is provided with check valve 23 and the 8th valve on the described vacuum pump 25 input first-class gauge 22 of connection and connecting line 24, the outfan of vacuum pump 25 is connected with the 5th relief valve 33.
Described pressure power drive system 57 includes that first reservoir the 1, first valve 2 being sequentially connected with, constant-flux pump 3, first are pressed Force transducer 4 and the first relief valve 5, pressure power drive system 57 connects the drive end of first piston container 7 by the second valve 6, The drive end of the second piston container 15 is connected by the 5th valve 14.
Described calibration system 58 includes standard chamber 30 and calibrated bolck room 32, is placed with the page of known volume in calibrated bolck room 32 Rock core sample block, the entrance of standard chamber 30 connects the outlet of check valve 23, and is provided with the 9th valve 26, in high precision on pipeline Temperature sensor the 27, the 4th pressure transducer 28 and the 4th relief valve 29, export through the tenth valve 31 connection standard block room 32, demarcate System 58 utilizes the state equation law of gas to demarcate from the manifold volume between the 4th valve 13 and the 7th valve 21 to back-pressure valve 46 With instrument internal volume.
Described fill out sand tube 41 is connected with the hydraulically powered axial compression pump 38 of dependence, and axial compression pump 38 effect is to be compacted in sample room 43 On slate flour, the pressured state of shale under simulation stratum condition, the input of axial compression pump 38 connect the second reservoir 36 and Being provided with the 11st valve 37 on pipeline, outfan connects the input of fill out sand tube 41 and is provided with the 12nd valve 39 on pipeline, fills out The input of sandpipe 41 is connected with the outfan of check valve 23 and arranges the 6th relief valve 34 and the 5th pressure biography on pipeline Sensor 35, outfan is sequentially connected with the 6th pressure transducer the 44 and the 13rd valve 45, and fill out sand tube 41 is internal includes sample room 43 He Connecting the piston with groove 42 of sample room 43, piston 42 is designed with groove on shale side pressing close to, and its object is to increase Gas and the contact area of shale so that it is more abundant that gas displacement and adsorption process are carried out.
Described back pressure control system 59 is used for controlling fill out sand tube outlet pressures, simulates stressor layer state truly, its bag Including electronic backpressure pump 50, back pressure buffer container 52 and back-pressure valve 46, electronic backpressure pump 50 input connects the 7th relief valve 49, defeated Go out to terminate back pressure buffer container 52 and the 14th valve 51 is set in its pipeline, between back pressure buffer container 52 and back-pressure valve 46 Connecting line is provided with the 7th pressure transducer 47 and the 6th relief valve 48, the input of back-pressure valve 46 and the 13rd valve 45 Outfan connects, and outfan is sequentially connected with second gauge 53, infrared gas analyzer the 54, the 15th valve 55 and tail gas recycle Container 56.
Described second gauge 53 and infrared gas analyzer 54, survey in real time to gas component and each composition flow rate Amount, overcomes the shortcoming that measurement result is delayed compared with gas chromatographicanalyzer.
All connecting lines all use 316L pipeline, in case CO2Sour corrosion to pipeline;And connect the 3rd valve 8 and the Seven valves 16 arrive all pipelines between second gauge 53, are wound around parcel with insulation material.
Present invention also offers based on described a kind of CO2Displacement shale gas and shale are to shale gas or CO2Absorption resolve mould The method intending test system, including CO2Displacement shale gas analog detection method and shale core are to shale gas or CO2Absorption, solution Analysis experimental technique, it is characterised in that
CO2Displacement shale gas analog detection method comprises the steps:
Step 1, sets experimental temperature to calorstat 40;
Step 2, test experience device sealing, it is ensured that sealing effectiveness;
Step 3, demarcates from the manifold volume between the 4th valve 13 and the 7th valve 21 to back-pressure valve 46;
Step 4, carries out evacuation to device, arranges the pressure of back-pressure valve 46;
Step 5, injects CH in shale core4Gas is to saturated;
Step 6, notes CO2Displacement CH4
Step 7, processes experimental data;
Step 8, changes temperature, pressure that experiment sets, repeats above step, can obtain between pressure gas production Relation between relation, temperature gas production, thus study the CO of different conditions2To shale under different temperatures, pressure condition The replacement result of gas;
Shale core is to shale gas or CO2Absorption, resolve experimental technique comprise the steps:
Step 1, sets experimental temperature to calorstat 40;
Step 2, test experience device sealing, it is ensured that sealing effectiveness;
Step 3, demarcates from the manifold volume between the 4th valve 13 and the 7th valve 21 to back-pressure valve 46;
Step 4, carries out evacuation to device, arranges the pressure of back-pressure valve 46;
Step 5, injects CH to shale core4/CO2To saturated;
Step 6, blood pressure lowering resolves, and processes experimental data;
Step 7, changes temperature, pressure that experiment sets, repeats above step, available time adsorbance/parsing amount Between relation, the relation between pressure adsorption amount/parsing amount, the relation between temperature adsorption amount/parsing amount, thus grind Study carefully shale core gas absorption under different temperatures, pressure condition, resolve rule.
Compared with prior art, the invention has the beneficial effects as follows:
(1) present invention is exclusively used in simulation and tests the CO of different conditions2To shale gas under different temperatures, pressure condition Replacement result.This experimental provision can also be utilized to carry out shale core to shale gas or CO simultaneously2Absorption, resolve experiment, grind Study carefully shale core gas absorption under different temperatures, pressure condition, resolve rule.
(2) first booster pumps 10 and the second booster pump 18 are possible not only to play the effect of supercharging for system pipeline, it is also possible to As required, select suitable specifications and models, set discharge capacity, the flow of regulation pump.
(3) method that the present invention reduces test error: is the pipeline using suitable internal diameter;Two is to use calibration system 58 Demarcating volume, calibration system 58 includes standard chamber 30 and calibrated bolck room 32, and calibration system 58 utilizes the state equation of gas to demarcate From the manifold volume between the 4th valve 13 and the 7th valve 21 to back-pressure valve 46 and container volume, the mistake of test can be effectively reduced Difference.
(4) calorstat 40 of the present invention can control the temperature of slate flour in fill out sand tube as required, and axial compression pump 38 can So that slate flour is carried out compaction, with the pressure in back pressure control system 57 co-controlling fill out sand tube, not equality of temperature can be carried out Displacement experiment under degree, pressure.
(5) present invention uses material to be slate flour, it is impossible to enough simulate as straight as a die replacement process.
(6) present invention includes second gauge 53 and infrared gas analyzer 54, it is possible to quickly measure mixed gas Total volumetric flow rate and the concentration of each component, it is achieved the function of the amount of the real time measure fill out sand tube output each composition of gas, intuitively reflect CO2Displacement CH4Effect.
(7) in apparatus of the present invention, all connecting lines all use 316L pipeline, in case CO2Sour corrosion to pipeline;And Connect all pipeline insulation materials between the 3rd valve 8 and the 6th valve the 16 to the second gas flowmeter 53 and be wound around parcel, it is simple to The test error that prevent heat from transmitting, scatter and disappear etc. causes.
Accompanying drawing explanation
Fig. 1 is present configuration schematic diagram.
Detailed description of the invention
Embodiments of the present invention are described in detail below in conjunction with the accompanying drawings with embodiment.
As it is shown in figure 1, a kind of CO2Displacement shale gas simulating test device, including CO2Gas cylinder 9 and CH4Gas cylinder 17, described CO2Gas cylinder 9 and CH4Gas cylinder 17 connects first piston container 7 and the input of the second piston container 15, first piston container 7 respectively Connecting with the power drive end of the second piston container 15 and have hydraulic pressure power-driven system 57, outfan is connected to fill out sand tube 41 Input, and it is provided with vacuum pump 25, calibration system 58 connecting on pipeline, fill out sand tube 41 is placed in calorstat 40, and Being connected with axial compression pump 38, outfan is connected to tail gas recycle container 56, and arranges outside line gas analyser 54 and back pressure on pipeline Control system 59, wherein:
CO2Gas cylinder 9 can access gas as required, should deposit downward-sloping for bottle mouth of gas cylinder when depositing, it is simple to stable Ground storage and output CO2。CO2Gas cylinder 9 be sequentially connected with first booster pump the 10, second relief valve the 11, second pressure transducer 12, Three valves 8, first piston container 7 and the 4th valve 13.The effect of the first booster pump 10 is to increase CO2The pressure of gas makes its pressure Reach desired value.First piston container 7 uses fluid pressure drive device, can will have certain pressure CO2The injection that gas is stable In fill out sand tube.
CH4Gas cylinder 17 can access gas as required, should deposit downward-sloping for bottle mouth of gas cylinder when depositing, it is simple to stable Ground storage and output CH4。CH4Gas cylinder 17 be sequentially connected with the second booster pump 18, the 3rd relief valve 19, the 3rd pressure transducer 20, Six valve the 16, second piston container 15 and the 7th valves 21.The effect of the second booster pump 18 is to increase CH4The pressure of gas makes it press Power reaches desired value.Second piston container 15 uses fluid pressure drive device, can will have certain pressure CH4The note that gas is stable Enter in fill out sand tube.
First piston container 7 and the second piston container 15 connect dynamic drive system 57, and power-driven system 57 is successively Connecting and include first reservoir the 1, first valve 2, constant-flux pump the 3, first pressure transducer 4 and the first relief valve 5, constant-flux pump 3 is permissible As required, select suitable specifications and models, set discharge capacity, it is possible to the flow of regulation pump.This device passes through the second valve 6 and the 5th valve 14 are respectively connecting to first piston container 7 and the drive end of the second piston container 15.
Vacuum pump 25 is connected to first piston container 7 and the second piston container 15, respectively through its port of export the 4th valve 13 He 7th valve 21 imports first-class gauge 22, and pipeline passes sequentially through check valve the 23, the 8th valve 24, and vacuum pump 25 port of export arranges Five relief valve 33.
Calibration system 58 includes standard chamber 30 and calibrated bolck room 32, and calibration system 58 utilizes the state equation law mark of gas Fixed from the manifold volume between the 4th valve 13 and the 7th valve 21 to back-pressure valve 46 and container volume, the entrance of standard chamber 30 connects single To the outlet of valve 23, and be provided with on pipeline the 9th valve 26, temperature sensors of high precision 27, the 4th pressure transducer 28, Four relief valve 29, outlet connects core block room 32 through the tenth valve 31.
Fill out sand tube 41 is positioned at calorstat 40, connects and has axial compression pump 38, axial compression pump 38 to rely on hydraulic-driven, and input connects Second fluid reservoir 36, and on pipeline, it is provided with the 11st valve 37, outfan connects the input of fill out sand tube 41, and on pipeline Being provided with the 12nd valve 39, the input of fill out sand tube 41 and the outfan of the 9th valve 26 are connected, and arrange the 6th peace on pipeline Full valve 34 and the 5th pressure transducer 35, outfan is sequentially connected with the 6th pressure transducer the 44 and the 13rd valve 45.Fill out sand tube 41 In squeeze piston 42 and sample room 43 are set, piston face is provided with cuboid groove, its role is to increase gas injection time gas With the contact area of slate flour, improve conventional efficient;Calorstat 40 and axial compression pump 38 can control fill out sand tube 41 as required Temperature and pressure, simulate specific temperature and pressure condition, CO2Displacement CH4Process, but experimental subject is only shale powder End, therefore can not effectively simulate as straight as a die displacement replacement process.
Back pressure control system 59 includes electronic backpressure pump 50, back pressure buffer container 52 and back-pressure valve 46.Electronic backpressure pump 50 Suitable specifications and models can be selected as required, set discharge capacity, pressure, it is possible to the flow of regulation pump.Electronic backpressure pump input Being connected to the 7th relief valve 49, outfan is connected to back pressure buffer container 52, and arranges the 14th valve 51 in its pipeline, and back pressure buffers Connecting line between container 52 and back-pressure valve 46 is provided with the 7th pressure transducer 47 and the 6th relief valve 48, back-pressure valve 46 Input and the 13rd valve 45 outfan connect, outfan is provided with second gauge 53.
Infrared gas analyzer 54 input is connected to the outfan of fill out sand tube 41, and arranges second flow on pipeline Meter 53.Second gauge 53 can with meter gaseous total flow, infrared gas analyzer 54 can measure in real time gas component with And concentration, fast and easy, outfan is connected to tail gas recycle container 56, and is provided with the 15th valve 55 on pipeline, and tail gas recycle is held Discarded gas after device recovery experiment, plays the effect of protection environment.
In the present invention, first-class gauge 22, second gauge 53, infrared gas analyzer the 54, first pressure transducer 4, the second pressure transducer the 11, the 3rd pressure transducer the 19, the 4th pressure transducer the 28, the 5th pressure transducer the 35, the 6th pressure Force transducer the 44, the 7th pressure transducer 47 and calorstat 40 be all connected with digital collection control card, can by gather pressure, Temperature and data on flows process and generate initial data form, and analytical statement and curve chart generate database file form simultaneously So that user flexibility uses.
In the present invention, all connecting lines all use 316L pipeline, in case CO2Sour corrosion to pipeline;And connect the 3rd Valve 8 and the 6th valve 16 arrive all pipelines between second gauge 53, are wound around parcel with insulation material, it is simple to prevent heat from passing The test error that pass, scatter and disappear etc. causes.
The present invention provides according to aforementioned CO2Displacement shale gas analog detection method, comprises the following steps:
Step 1, assembles experimental facilities according to the Experimental equipment of Fig. 1, calorstat 40 is set experimental temperature.
Step 2, test experience device sealing.
All valves of shutoff device, open the second valve the 2, the 5th valve the 14, the 6th valve 16 and the 7th valve 21, by CH4Gas cylinder The CH of 174Gas proceeds in the second piston container 15, is pressurized to set pressure to the second piston container 15 with constant-flux pump 3.Close Second valve the 2, the 5th valve 14 and the 6th valve 16, after stable, slowly open check valve 23, makes high pressure CH4Gas slowly proceeds to fill out In sandpipe 41, experimental system is carried out work pressure test, determine that its sealing is good.
Step 3, demarcates from the manifold volume between the 4th valve 13 and the 7th valve 21 to back-pressure valve 46.
Open the 11st valve the 37 and the 12nd valve 39, utilize axial compression pump 38 to add certain axial compression by sample room 43 to fill out sand tube 41 Interior shale rubble is compacted, and closes the 11st valve the 37 and the 12nd valve 39 after compacting.
Open the 4th valve the 13, the 7th valve 21, check valve the 23, the 8th valve the 24, the 9th valve the 26 and the 13rd valve 45, utilize vacuum Pump 25 carries out evacuation to first piston container the 7, second piston container 15 and pipeline, closes the 4th valve the 13, the 7th valve 21 and list To valve 23, open the first valve the 2, the 5th valve 14 and the 6th valve 16, by CH4The CH of gas cylinder 174Gas proceeds to the second piston container 15 In, it is pressurized to set pressure to the second piston container 15 with constant-flux pump 3, closes the second valve the 2, the 5th valve 14 and the 6th valve 16, treat After Wen Ding, slowly open the 7th valve 21 and check valve 23, after pressure stabilisation, record temperature sensors of high precision 27 and the 4th pressure Registration T of force transducer 281And P1, taking out the calibrated bolck 1 of calibrated bolck room 32, standard chamber volume is V1, the volume of calibrated bolck 1 is V ', opens the tenth valve 31, after temperature, pressure is stable, records temperature sensors of high precision 27 and the 4th pressure transducer 28 Registration T2And P2, can calculate from the manifold volume between the 4th valve 13 and the 7th valve 21 to back-pressure valve 46 according to ripple horse law accordingly:
V=(P2T1V1+P2T1V’-P1T2V1)/(P2T1-P2T1), close the 9th valve 26 after demarcation.
Step 4, carries out evacuation to device, arranges the pressure of back-pressure valve.
After closing all valves, open the 4th valve the 13, the 7th valve 21, first-class gauge the 22, the 8th valve the 23, the 9th valve 26 and 13rd valve 45, utilizes vacuum pump 25 that first piston container the 7, second piston container 15 and pipeline are carried out evacuation, evacuation Rear cut out the 8th valve the 24 and the 13rd valve 45, opens the 14th valve 51, utilizes electronic backpressure pump 50 to increase back pressure buffer container 52 It is pressed onto setting pressure.After waiting to stablize, slowly opening back-pressure valve 46, the pressure keeping back-pressure valve 46 is constant.
Step 5, injects CH in shale core4Gas is to saturated.
Close check valve 23 and the 4th valve 13, open the first valve the 2, the 5th valve 14 and the 6th valve 16, by CH4The CH of gas cylinder 174 Gas proceeds in the second piston container 15, is pressurized to set pressure to the second piston container 15 with constant-flux pump 3, sets pressure and is closing It is slightly above back pressure pressure in the range of reason, closes the second valve the 2, the 5th valve 14 and the 6th valve 16, after stable, slowly open check valve 23 and the 13rd valve 45, makes high pressure CH4Gas slowly proceeds in fill out sand tube 41, allows gas sufficiently be spread and to adsorb.So Rear closedown check valve 23, allows gas fully be spread in rock core and farthest adsorbs.
Step 6, notes CO2Displacement CH4
Open the first valve the 2, second valve 6 and the 3rd valve 8, by CO2The CO of gas cylinder 92Gas proceeds in first piston container 7, uses First piston container 7 is pressurized to set pressure by constant-flux pump 3, sets pressure and slightly above sets back pressure pressure in the reasonable scope, Close the first valve the 2, second valve 6 and the 3rd valve 8, after stable, slowly open the 4th valve 13, check valve 23, make CO2Fluid is slow Proceed to, in core chamber 41, inject appropriate CO2After, close check valve 23.Ensure CO2At the time long enough of rock core, to reach to fill Split and change CH4Purpose.
After pressure stabilisation, open the first valve the 2, second valve the 6, the 3rd valve 8 and check valve 23, by CO2The CO of gas cylinder 92Gas Proceed in first piston container 7, be pressurized to set pressure to first piston container 7 with constant-flux pump 3, set pressure at zone of reasonableness Interior slightly above setting back pressure pressure, closes the first valve the 2, second valve 6 and the 3rd valve 8, after stable, slowly opens check valve, logical CO2CO is no longer gone out to infrared gas analyzer 542Till.
Step 7, processes experimental data.
CH4Adsorbance calculates: gone out to be passed through CH by first-class gauge 22 is measurable4Cumulative volume VinCH4, the CH that is passed through4One Dividing and adsorb on shale with ADSORPTION STATE, a part is full of pipeline and volume for demarcating volume V, by temperature pressure sensing with free state The pressure and temp value that device records, can calculate the CH being passed through4Quality m1 is totalWith free state CH4Quality m1 trip, do difference and i.e. can get CH4Inhale Attached amount m1 inhales
CO2The calculating of displacement methane content: said process can be learnt according to first-class gauge 22 and be passed through CO2Cumulative volume, root CO is measured according to second gauge 53 and infrared gas analyzer 542Accumulative elution volume, remaining CO in the duct2Volume, The pressure and temp value recorded by temperature and pressure transmitter can be calculated result and is respectively m2 is total,m2 go out,m2 trips, then CO is obtained2Absorption Amount m2 inhale=m2 is total-m2 go out-m2 trips, wherein CO2Accumulative elution volume calculates according to monitoring volume integral in real time.
CH4/CO2The calculating of rock core implantation quality: utilize the above results, can assess replacement result.
Step 8, changes temperature, pressure that experiment sets, repeats above step, can obtain between pressure gas production Relation etc. between relation, temperature gas production, thus study the CO of different conditions2To page under different temperatures, pressure condition The replacement result of rock gas.
The present invention provides and carries out shale core to shale gas or CO according to previous experiments device2Absorption, resolve experiment, bag Include following experimental procedure:
Step 1, assembles experimental facilities according to the Experimental equipment of Fig. 1, calorstat 40 is set experimental temperature.
Step 2, test experience device sealing.
All valves of shutoff device, open the second valve the 2, the 5th valve the 14, the 6th valve 16 and the 7th valve 21, by CH4Gas cylinder The CH of 174Gas proceeds in the second piston container 15, is pressurized to set pressure to the second piston container 15 with constant-flux pump 3.Close Second valve the 2, the 5th valve 14 and the 6th valve 16, after stable, slowly open check valve 23, makes high pressure CH4Gas slowly proceeds to fill out In sandpipe 41, experimental system is carried out work pressure test, determine that its sealing is good.
Step 3, demarcates from the manifold volume between the 4th valve 13 and the 7th valve 21 to back-pressure valve 46.
Open the 11st valve the 37 and the 12nd valve 39, utilize axial compression pump 38 to add certain axial compression by sample room 43 to fill out sand tube 41 Interior shale rubble is compacted, and closes the 11st valve the 37 and the 12nd valve 39 after compacting.
Open the 4th valve the 13, the 7th valve 21, check valve the 23, the 8th valve the 24, the 9th valve the 26 and the 13rd valve 45, utilize vacuum Pump 25 carries out evacuation to first piston container the 7, second piston container 15 and pipeline, closes the 4th valve the 13, the 7th valve 21 and list To valve 23, open the first valve the 2, the 5th valve 14 and the 6th valve 16, by CH4The CH of gas cylinder 174Gas proceeds to the second piston container 15 In, it is pressurized to set pressure to the second piston container 15 with constant-flux pump 3, closes the second valve the 2, the 5th valve 14 and the 6th valve 16, treat After Wen Ding, slowly open the 7th valve 21 and check valve 23, after pressure stabilisation, record temperature sensors of high precision 27 and the 4th pressure Registration T of force transducer 281And P1, taking out the calibrated bolck 1 of calibrated bolck room 32, standard chamber volume is V1, the volume of calibrated bolck 1 is V ', opens the tenth valve 31, after temperature, pressure is stable, records temperature sensors of high precision 27 and the 4th pressure transducer 28 Registration T2And P2, can calculate from the manifold volume between the 4th valve 13 and the 7th valve 21 to back-pressure valve 46 according to ripple horse law accordingly:
V=(P2T1V1+P2T1V’-P1T2V1)/(P2T1-P2T1), close the 9th valve 26 after demarcation.
Step 4, carries out evacuation to device, arranges the pressure of back-pressure valve.
After closing all valves, open the 4th valve the 13, the 7th valve 21, first-class gauge the 22, the 8th valve the 23, the 9th valve 26 and 13rd valve 45, utilizes vacuum pump 25 that first piston container the 7, second piston container 15 and pipeline are carried out evacuation, evacuation Rear cut out the 8th valve the 24 and the 13rd valve 45, opens the 14th valve 51, utilizes electronic backpressure pump 50 to increase back pressure buffer container 52 It is pressed onto setting pressure.After waiting to stablize, slowly opening back-pressure valve 46, the pressure keeping back-pressure valve 46 is constant.
Step 5, injects CH to shale core4/CO2To saturated.
Note CH4: close check valve 23 and the 4th valve 13, open the first valve the 2, the 5th valve 14 and the 6th valve 16, by CH4Gas cylinder The CH of 174Gas proceeds in the second piston container 15, is pressurized to set pressure to the second piston container 15 with constant-flux pump 3, sets Pressure is slightly above back pressure pressure in the reasonable scope, closes the second valve the 2, the 5th valve 14 and the 6th valve 16, after stable, slowly beats Opening one-way valve the 23 and the 13rd valve 45, makes high pressure CH4Gas slowly proceeds in fill out sand tube 41, allow gas sufficiently be spread and Absorption.It is then shut off check valve 23, allows gas fully be spread in rock core and farthest adsorb.
Note CO2: close check valve 23 and the 7th valve 21, open the first valve the 2, second valve 6 and the 3rd valve 8, by CO2Gas 9 CO2Gas proceeds in first piston container 7, is pressurized to set pressure to first piston container 7 with constant-flux pump 3, sets pressure and exists It is slightly above back pressure pressure in zone of reasonableness, closes the first valve the 2, second valve 6 and the 3rd valve 8, after stable, slowly open check valve 23 and the 13rd valve 45, makes high pressure CO2Gas slowly proceeds in fill out sand tube 41, allows gas sufficiently be spread and to adsorb.So Rear closedown check valve 23, allows gas fully be spread in rock core and farthest adsorbs.
Step 6, blood pressure lowering resolves, and processes experimental data.
Computer is utilized to carry out Treatment Analysis the data (temperature, pressure, flow) gathered, available CH4/CO2To shale Absorption/analytic curve.
Step 7, changes temperature, pressure that experiment sets, repeats above step, available time adsorbance/parsing amount Between relation, the relation between pressure adsorption amount/parsing amount, the relation etc. between temperature adsorption amount/parsing amount, thus Study shale core gas absorption under different temperatures, pressure condition, resolve rule.

Claims (10)

1.CO2Displacement shale gas and shale are to shale gas or CO2Absorption analytic simulation test system, it is characterised in that include CO2Gas cylinder (9) and CH4Gas cylinder (17), CO2The port of export of gas cylinder (9) is connected to first piston container (7), CH4Gas cylinder (17) The port of export is connected to the second piston container (15), and the power drive end of first piston container (7) and the second piston container (15) is equal Connecting hydraulic pressure power-driven system (57), outfan is all connected with the input of fill out sand tube (41) that is placed in calorstat (40) also Being provided with vacuum pump (25) and calibration system (58) on connecting line, the outfan of fill out sand tube (41) connects tail gas recycle bottle (56) infrared gas analyser (54) and back pressure control system (59), and it are provided with on connecting line.
CO the most according to claim 12Displacement shale gas and shale are to shale gas or CO2Absorption analytic simulation test system, It is characterized in that,
Described CO2Gas cylinder (9) be sequentially connected with the first booster pump (10), the second relief valve (11), the second pressure transducer (12), Three valves (8), first piston container (7) and the 4th valve (13), the outlet of the 4th valve (13) connects the 7th valve (21) and first flow Meter (22);
Described CH4Gas cylinder (17) be sequentially connected with the second booster pump (18), the 3rd relief valve (19), the 3rd pressure transducer (20), Six valves (16), the second piston container (15) and the 7th valve (21), the outlet of the 7th valve (21) connects the 4th valve (13) and first-class Gauge (22);
It is provided with check valve (23) and the 8th on described vacuum pump (25) the input first-class gauge of connection (22) and connecting line Valve (24), the outfan of vacuum pump (25) is connected with the 5th relief valve (33).
CO the most according to claim 12Displacement shale gas and shale are to shale gas or CO2Absorption analytic simulation test system, It is characterized in that, the first reservoir (1) that described pressure power drive system (57) includes being sequentially connected with, the first valve (2), constant-flux pump (3), the first pressure transducer (4) and the first relief valve (5), pressure power drive system (57) connects first by the second valve (6) The drive end of piston container (7), connects the drive end of the second piston container (15) by the 5th valve (14).
CO the most according to claim 12Displacement shale gas and shale are to shale gas or CO2Absorption analytic simulation test system, It is characterized in that, described calibration system (58) includes standard chamber (30) and calibrated bolck room (32), and calibrated bolck room is placed with in (32) The shale core sample blocks of known volume, the entrance of standard chamber (30) connects the outlet of check valve (23), and arranges on pipeline There are the 9th valve (26), temperature sensors of high precision (27), the 4th pressure transducer (28) and the 4th relief valve (29), export through the Ten valves (31) connection standard block room (32), calibration system (58) utilize the state equation law of gas to demarcate from the 4th valve (13) and 7th valve (21) is to the manifold volume between back-pressure valve (46) and instrument internal volume.
CO the most according to claim 12Displacement shale gas and shale are to shale gas or CO2Absorption analytic simulation test system, It is characterized in that, described fill out sand tube (41) is connected with the hydraulically powered axial compression pump (38) of dependence, and axial compression pump (38) effect is compacting On sample room (43) interior slate flour, the pressured state of shale under simulation stratum condition, the input of axial compression pump (38) connects the Two reservoirs (36) are also provided with the 11st valve (37) on pipeline, and outfan connects the input of fill out sand tube (41) and at pipeline Being provided with the 12nd valve (39), the input of fill out sand tube (41) is connected with the outfan of check valve (23) and arranges on pipeline 6th relief valve (34) and the 5th pressure transducer (35), outfan is sequentially connected with the 6th pressure transducer (44) and the 13rd valve (45), the internal piston with groove (42) including sample room (43) and connecting sample room (43) of fill out sand tube (41), piston (42) Be designed with groove pressing close on shale side, its object is to increase the contact area of gas and shale so that gas displacement and It is more abundant that adsorption process is carried out.
CO the most according to claim 12Displacement shale gas and shale are to shale gas or CO2Absorption analytic simulation test system, It is characterized in that, described back pressure control system (59) is used for controlling fill out sand tube outlet pressures, simulates stressor layer state truly, It includes electronic backpressure pump (50), back pressure buffer container (52) and back-pressure valve (46), and electronic backpressure pump (50) input connects the Seven relief valve (49), outfan takes back pressure buffer container (52) and arranges the 14th valve (51) in its pipeline, and back pressure buffering is held Connecting line between device (52) and back-pressure valve (46) is provided with the 7th pressure transducer (47) and the 6th relief valve (48), returns The outfan of the input of pressure valve (46) and the 13rd valve (45) connects, and outfan is sequentially connected with second gauge (53), infrared Line gas analyser (54), the 15th valve (55) and tail gas recycle container (56).
CO the most according to claim 62Displacement shale gas and shale are to shale gas or CO2Absorption analytic simulation test system, It is characterized in that gas component and each composition flow rate are entered by described second gauge (53) and infrared gas analyzer (54) Row is measured in real time.
CO the most according to claim 12Displacement shale gas and shale are to shale gas or CO2Absorption analytic simulation test system, It is characterized in that, all connecting lines all use 316L pipeline, in case CO2Sour corrosion to pipeline;And connect the 3rd valve (8) And the 7th valve (16) to all pipelines between second gauge (53), be wound around parcel with insulation material.
9. one kind based on CO described in claim 12Displacement shale gas and shale are to shale gas or CO2Absorption analytic simulation test The method of system, including CO2Displacement shale gas analog detection method and shale core are to shale gas or CO2Absorption, resolve experiment Method, it is characterised in that
CO2Displacement shale gas analog detection method comprises the steps:
Step 1, sets experimental temperature to calorstat (40);
Step 2, test experience device sealing, it is ensured that sealing effectiveness;
Step 3, demarcates from the manifold volume between the 4th valve (13) and the 7th valve (21) to back-pressure valve (46);
Step 4, carries out evacuation to device, arranges the pressure of back-pressure valve (46);
Step 5, injects CH in shale core4Gas is to saturated;
Step 6, notes CO2Displacement CH4
Step 7, processes experimental data;
Step 8, changes temperature, pressure that experiment sets, repeats above step, can obtain the pass between pressure gas production Relation between system, temperature gas production, thus study the CO of different conditions2To shale gas under different temperatures, pressure condition Replacement result;
Shale core is to shale gas or CO2Absorption, resolve experimental technique comprise the steps:
Step 1, sets experimental temperature to calorstat (40);
Step 2, test experience device sealing, it is ensured that sealing effectiveness;
Step 3, demarcates from the manifold volume between the 4th valve (13) and the 7th valve (21) to back-pressure valve (46);
Step 4, carries out evacuation to device, arranges the pressure of back-pressure valve (46);
Step 5, injects CH to shale core4/CO2To saturated;
Step 6, blood pressure lowering resolves, and processes experimental data;
Step 7, changes temperature, pressure that experiment sets, repeats above step, between available time adsorbance/parsing amount Relation, the relation between pressure adsorption amount/parsing amount, the relation between temperature adsorption amount/parsing amount, thus study page Rock rock core gas absorption under different temperatures, pressure condition, resolve rule.
Method the most according to claim 1, it is characterised in that
Described CO2In displacement shale gas analog detection method, process experimental data and include:
CH4Adsorbance calculates: is measured by first-class gauge (22) and is passed through CH4Cumulative volume VinCH4, the CH that is passed through4A part with ADSORPTION STATE adsorb on shale, a part with free state be full of pipeline and volume for demarcate volume V, temperature and pressure transmitter survey The pressure and temp value obtained, calculates the CH being passed through4Quality m1 is totalWith free state CH4Quality m1 trip, do difference and obtain CH4Adsorbance m1 inhales
CO2Displacement methane content calculates: learns according to first-class gauge (22) and is passed through CO2Cumulative volume, according to second gauge (53) CO is measured with infrared gas analyzer (54)2Accumulative elution volume, remaining CO in the duct2Volume, is passed by temperature, pressure The pressure and temp value that sensor records calculates result and is respectively m2 is total,m2 go out,m2 trips, then CO is obtained2Adsorbance m2 inhale=m2 is total-m2 go out- m2 trips, wherein CO2Accumulative elution volume calculates according to monitoring volume integral in real time.
CH4/CO2The calculating of rock core implantation quality: according to above-mentioned CH4Adsorbance and CO2The result of calculation of displacement methane content, assessment is put Change effect.
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CN106644820A (en) * 2016-12-29 2017-05-10 重庆科技学院 Shale gas desorption capacity tester under action of slickwater
CN106644818A (en) * 2016-12-29 2017-05-10 重庆科技学院 Shale gas well yield simulation tester under quick water effect
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CN109060591A (en) * 2018-07-12 2018-12-21 天津大学 A kind of evaluating apparatus and evaluation method for escaping gas performance of the adsorbent
CN110857927A (en) * 2018-08-24 2020-03-03 中国石油大学(北京) Competitive adsorption detection method and device for carbon dioxide and methane in shale
CN110761749A (en) * 2019-11-19 2020-02-07 中国华能集团有限公司 Simulation experiment system and experiment method for synthesis and exploitation of natural gas hydrate
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CN113406034A (en) * 2021-05-25 2021-09-17 南京信息工程大学 Device with constant-temperature and constant-humidity carbon dioxide sensor and detection method thereof
CN114062191A (en) * 2021-11-17 2022-02-18 中国地质大学(北京) Displacement adsorption experimental device and experimental method for binary gas in porous medium

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