CN106093345A - A kind of simulation CO2the method of displacement displacement shale pneumatic state process - Google Patents
A kind of simulation CO2the method of displacement displacement shale pneumatic state process Download PDFInfo
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Abstract
The invention provides a kind of simulation CO2The method of displacement displacement shale pneumatic state process, based on corresponding analog, is mainly placed in slate flour sample in the sample room of fill out sand tube, sets the original state of sample according to actual formation condition, after calibration pipeline volume, be passed through appropriate CH4, then carry out CO2Displacement displacement shale QI excess is tested, and according to the volume flowmeter of arrival end and the volume flowmeter of the port of export and infrared gas analyzer determination experiment data, can evaluate displacement replacement result by calculating.The present invention can monitor the action effect of displacement replacement process in real time, it is thus achieved that the factors such as temperature, pressure, injection discharge capacity are to CO2Displacement displacement CH4The affecting laws of dynamic process.
Description
Technical field
The invention belongs to Oil-Gas Field Development Engineering technical field, simulate CO particularly to one2Displacement displacement shale is pneumatic
The method of state process.
Background technology
Along with deepening continuously shale gas resources exploration, relevant hydraulic fracturing technology is the most ripe, meanwhile,
This technology needs to consume great lot of water resources and stratum can produce the problems such as pollution also to be paid close attention to by people.CO2Displacement
Displacement shale gas is one of focus of research the most both at home and abroad as a kind of new technique developing shale gas.Current research CO2
The method of displacement displacement is many for coal seam, less for shale；Secondly, about CO2The device of displacement displacement shale gas is subject to mostly
It is limited to measurement apparatus, is difficult to experiment process is monitored in real time.Therefore, data result of calculation has necessarily with regard to experimentation
Hysteresis quality, it is impossible in real time replacement result is carried out quantitative assessment.
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 simulation CO2Displacement displaced page
The method of rock gas dynamic process, can be with real-time Simulation the CO testing different temperatures, pressure, flow2At different temperatures, pressure strip
Replacement result to shale gas under part, and for a certain replacement result, the action rule of pressure and temperature can be analyzed.
To achieve these goals, the technical solution used in the present invention is:
A kind of simulation CO2Displacement displacement shale pneumatic state process method, based on analog include:
CO2Gas cylinder 9, be 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；
Hydraulic pressure power-driven system 57, including first reservoir the 1, first valve 2 being sequentially connected with, constant-flux pump the 3, first pressure
Sensor 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, logical
Cross the 5th valve 14 and connect the drive end of the second piston container 15；
Fill out sand tube 41, is placed in calorstat 40, connects first piston container 7 and the outfan of the second piston container 15；
Vacuum pump 25, the input first-class gauge 22 of connection of vacuum pump 25 and connecting line are provided with check valve 23 He
8th valve 24, the outfan of vacuum pump 25 is connected with the 5th relief valve 33；
Described calibration system 58, including standard chamber 30 and calibrated bolck room 32, is placed with known volume in calibrated bolck room 32
Shale core sample blocks, the entrance of standard chamber 30 connects the outlet of check valve 23, and is provided with the 9th valve 26, high-precision on pipeline
Degree temperature sensor the 27, the 4th pressure transducer 28 and the 4th relief valve 29, outlet is through the tenth valve 31 connection standard block room 32；
Tail gas recycle bottle 56, connects the outfan of fill out sand tube 41；
Back pressure control system 59, is used for controlling fill out sand tube outlet pressures, simulates stressor layer state truly, and it includes electricity
Dynamic backpressure pump 50, back pressure buffer container 52 and back-pressure valve 46, electronic backpressure pump 50 input connects the 7th relief valve 49, outfan
Take back pressure buffer container 52 and the 14th valve 51, the connection between back pressure buffer container 52 and back-pressure valve 46 are set in its pipeline
Pipeline is provided with the 7th pressure transducer 47 and the 6th relief valve 48, the input of back-pressure valve 46 and the output of the 13rd valve 45
End 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；
Infrared gas analyser 54, is arranged on the connecting line of fill out sand tube 41 and tail gas recycle bottle 56；
It is characterized in that, comprise the steps:
Step 1, sets experimental temperature to calorstat 40；
Step 2, test experience device sealing；
Step 3, operates calibration system 58, utilize the state equation law of gas demarcate from the 4th valve 13 and the 7th valve 21 to
Manifold volume between back-pressure valve 46；
Step 4, opens vacuum pump 25, to device evacuation, arranges the pressure of back-pressure valve 46；
Step 5, first provides CH4The CH of gas cylinder 174Gas boosting, by hydraulic pressure power-driven system 57 to fill out sand tube 41
Middle injection CH4Gas, the data of the record fill out sand tube 41 first-class gauge of arrival end 22, keep fill out sand tube 41 and relevant apparatus constant temperature
Constant voltage certain time is to saturated；
Step 6, is continually fed into CO with constant flow2, simulate CO2The dynamic process of displacement shale gas, until fill out sand tube 41
Port of export effluent air can't detect CH4Till, the first-class gauge of real time record 22, second gauge 53 and infrared therebetween
The data of line gas analyser 54；
Step 7, calculates CH according to experimental data4Adsorbance and CO2Displacement shale tolerance, test and assess CO2Displacement CH4Effect；
Step 8, changes temperature, pressure that experiment sets, repeats above step, obtain the pass between force-displacement tolerance
Relation between system, temperature displacement tolerance, thus study the CO of different temperatures, pressure, flow velocity2At different temperatures, pressure strip
Replacement result to shale gas under part.
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 step 3 is demarcated from the manifold volume between the 4th valve 13 and the 7th valve 21 to back-pressure valve 46, including following
Step:
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 slate flour sample is compacted, and closes the 11st valve the 37 and the 12nd valve 39 after compacting, opens the 4th valve the 13, the 7th valve 21, list
To valve the 23, the 8th valve the 24, the 9th valve the 26 and the 13rd valve 45, utilize vacuum pump 25 to first piston container the 7, second piston container
15 and pipeline carry out evacuation, close the 4th valve the 13, the 7th valve 21 and check 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, in the second piston container 15, be pressurized to the second piston container 15 with constant-flux pump 3
Set pressure, close the second valve the 2, the 5th valve 14 and the 6th valve 16, after stable, slowly open the 7th valve 21 and check valve 23,
After pressure stabilisation, record temperature sensors of high precision 27 and registration T of the 4th pressure transducer 281And P1, take out calibrated bolck room
The calibrated bolck one of 32, standard chamber volume is V1, the volume of calibrated bolck one is V, opens the tenth valve 31, after temperature, pressure is stable,
Record temperature sensors of high precision 27 and registration T of the 4th pressure transducer 282And P2, fixed according to the equation of gas state accordingly
Rule can calculate from the manifold volume between the 4th valve 13 and the 7th valve 21 to back-pressure valve 46:
V '=(P2T1V1+P2T1V-P1T2V1)/(P2T1-P2T1), close the 9th valve 26 after demarcation.
Described step 6 is simulated CO2The dynamic process of displacement shale gas, specifically includes following steps:
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 is slightly above back pressure pressure in the reasonable scope, closes
First valve the 2, second valve 6 and the 3rd valve 8, after stable, slowly open the 4th valve 13, check valve 23, makes CO2Fluid slowly proceeds to
In fill out sand tube 41, 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 92
Gas proceeds in first piston container 7, is pressurized to set pressure to first piston container 7 with constant-flux pump 3, sets pressure rationally
In the range of slightly above back pressure pressure, close the first valve the 2, second valve 6 and the 3rd valve 8, after stable, slowly open check valve, logical
CO2Until port of export effluent air can't detect CH4Till.
Described step 7 calculates CH4The method of adsorbance is as follows:
Gone out to be passed through CH by first-class gauge 22 is measurable4Cumulative volume VinCH4, the CH that is passed through4A part is adsorbed with ADSORPTION STATE
On shale samples, a part is full of pipeline and volume for demarcating volume V, the temperature and pressure transmitter pressure recorded with free state
Power temperature value, can calculate the CH being passed through4Quality m1 is totalWith free state CH4Quality m1 trip, do difference and i.e. can get CH4Adsorbance m1 inhales。
Described step 7 calculates CO2The method of displacement shale tolerance is as follows:
Learn according to first-class gauge 22 and be passed through CO2Cumulative volume, according to second gauge 53 and infrared ray gas analysis
CO measured by instrument 542Accumulative elution volume, remaining CO in the duct2Volume, temperature and pressure transmitter the pressure and temp recorded
Value, can calculate CO2Accumulative be passed through quality m2 is total, accumulative flow out quality m2 go outWith free state CO2Quality 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.
Compared with prior art, the advantage of the present invention is:
(1) present invention is exclusively used in simulation CO2The dynamic process of displacement displacement shale gas, the side of Real-Time Evaluation replacement result
Method.
(2) 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 sample in fill out sand tube, axial compression pump as required
38 can carry out compaction to slate flour sample, and the pressure with back pressure control system 57 co-controlling fill out sand tube can enter
Displacement experiment under row different temperatures, pressure.
(5) present invention uses material to be slate flour, can simulate ground the most truly compared with shale granule after compacting
The truth of layer, is easier to realize displacement replacement process compared with true core.
(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.
Accompanying drawing explanation
Fig. 1 is the structural representation of the analog that the present invention is based on.
Detailed description of the invention
Embodiments of the present invention are described in detail below in conjunction with the accompanying drawings with embodiment.
One of the present invention simulation CO2The method of displacement displacement shale pneumatic state process, its principle is:
First slate flour sample is placed in fill out sand tube, sets the original state of sample specimens according to actual formation condition
(including temperature and pressure)；Check the air-tightness of device；Utilize calibration system, use calibrated bolck to demarcate manifold volume；Open true
Device evacuation, operation back pressure control system are arranged back pressure by empty pump；Open CH4The booster pump of gas and power-driven system,
By CH4Gas injects fill out sand tube system, fully adsorbs under simulation stratum condition, and the volume recording fill out sand tube arrival end adds up
Flow；Open CO2The booster pump of gas and power-driven system, continue to be passed through CO in system2Until port of export effluent air
In can't detect CH4Till, real time record also processes volume flow and counts the data with infrared gas analyzer；Change is filled out
The temperature of sandpipe, pressure, CO under research different temperatures, pressure, flow condition2Displacement CH4Effect, analyze inherent law.
Specifically, based on analog as shown in Figure 1, device includes 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 and second respectively
The power drive end of piston container 15 connects hydraulic pressure power-driven system 57, and outfan is connected to the input of fill out sand tube 41
End, 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 is 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 control on pipeline
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.
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 simulation process that the present invention is complete includes arranging as follows:
Step 1, assembles experimental facilities according to the installation drawing 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, operation calibration system is demarcated 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 slate flour sample 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, list
To valve the 23, the 8th valve the 24, the 9th valve the 26 and the 13rd valve 45, utilize vacuum pump 25 to first piston container the 7, second piston container
15 and pipeline carry out evacuation, close the 4th valve the 13, the 7th valve 21 and check 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, in the second piston container 15, be pressurized to the second piston container 15 with constant-flux pump 3
Set pressure, close the second valve the 2, the 5th valve 14 and the 6th valve 16, after stable, slowly open the 7th valve 21 and check valve 23,
After pressure stabilisation, record temperature sensors of high precision 27 and registration T of the 4th pressure transducer 281And P1, take out calibrated bolck room
The calibrated bolck 1 of 32, standard chamber volume is V1, the volume of calibrated bolck 1 is V ', opens the tenth valve 31, after temperature, pressure is stable, and note
The lower temperature sensors of high precision 27 of record and registration T of the 4th pressure transducer 282And P2, accordingly according to equation of gas state law
Can calculate from the manifold volume between the 4th valve 13 and the 7th valve 21 to back-pressure valve 46:
V=(P2T1V1+P2T1V’-P1T2V1)/(P2T1-P2T1), close the 9th valve 26 after demarcation.
Step 4, opens vacuum pump, to device evacuation, 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, to CH4Gas boosting, injects CH by power-driven system in shale samples4Gas, records fill out sand tube
The data of entrance volume flowmeter, keep fill out sand tube and relevant apparatus constant temperature and pressure certain time saturated to shale samples.
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 to, in fill out sand tube 41, be passed through CH4Cumulative volume VinCH1, allow gas obtain
Sufficiently diffusion and absorption.It is then shut off check valve 23, allows gas fully be spread in shale samples and farthest
Absorption.
Step 6, is constantly passed through CO with constant flow2, simulate CO2The dynamic process of displacement shale gas, until outlet
End effluent air can't detect CH4Till, real time record volume flowmeter and the data of infrared gas analyser therebetween.
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 in fill out sand tube 41, after pressure stabilisation, open the first valve the 2, second valve the 6, the 3rd valve 8 and check valve 23, by CO2Gas cylinder 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
Slightly above set 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
Check valve, is continually fed into CO with constant flow2Until port of export effluent air can't detect CH4Till, record is passed through
CO2Cumulative volume VinCO2, calculate CO according to second gauge 53 and infrared gas analyzer 542Accumulative elution volume
VoutCO2。
Step 7, calculates CH according to experimental data4Adsorbance and CO2Displacement shale tolerance, test and assess CO2Displacement CH4Effect.
CH4Adsorbance calculates: gone out to be passed through CH by first-class gauge 22 is measurable4Cumulative volume VinCH1, the CH that is passed through4One
Dividing and adsorb on shale samples with ADSORPTION STATE, a part is full of pipeline and volume for demarcating volume V, by temperature, pressure with free state
The pressure and temp value that sensor records, can calculate the CH being passed through4Quality m1 is totalWith free state CH4Quality m1 trip, do difference the most available
CH4Adsorbance m1 inhales。
CO2The calculating of adsorbance: above-mentioned experimentation can be learnt according to first-class gauge 22 and be passed through CO2Cumulative volume
VinCO2, measure CO according to second gauge 53 and infrared gas analyzer 542Accumulative elution volume VoutCO2, remain in pipe
CO in road2Volume VCO2, temperature and pressure transmitter the pressure and temp value recorded can be calculated 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 is according to monitoring volume integral meter in real time
Draw.
CH4The calculating of replacement amount: measure CH according to second gauge 53 and infrared gas analyzer 544Accumulative outflow
Volume VoutCH4, CH can be calculated4Accumulative discharge m1 goes out, then by CO2The CH displaced4Quality be m1 changes=m1 goes out-m1 trip。
CH4/CO2The calculating of replacement result: utilize the above results, can be according to displacing CH4Total amount and absorption CH4Total amount
Ratio assessment obtain replacement result evaluate Mathematics Proof, according to CO2Adsorbance evaluates CO2Displacement replacement result.
Step 8 changes temperature, the pressure that experiment sets, and repeats above step, can obtain between force-displacement tolerance
Relation, relation etc. between temperature displacement tolerance, thus study the CO of different temperatures, pressure, flow2Different temperatures,
Replacement result to shale gas under pressure condition.
Claims (6)
1. a simulation CO2Displacement displacement shale pneumatic state process method, based on analog include:
CO2Gas cylinder (9), is sequentially connected with the first booster pump (10), the second relief valve (11), the second pressure transducer (12), the 3rd valve
(8), first piston container (7) and the 4th valve (13), outlet connection the 7th valve (21) and the first-class gauge of the 4th valve (13)
(22)；
Described CH4Gas cylinder (17), be sequentially connected with the second booster pump (18), the 3rd relief valve (19), the 3rd pressure transducer (20),
6th valve (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
Effusion meter (22)；
Hydraulic pressure power-driven system (57), including the first reservoir (1) being sequentially connected with, the first valve (2), constant-flux pump (3), first
Pressure transducer (4) and the first relief valve (5), pressure power drive system (57) connects first piston container by the second valve (6)
(7) drive end, connects the drive end of the second piston container (15) by the 5th valve (14)；
Fill out sand tube (41), is placed in calorstat (40), connects first piston container (7) and the output of the second piston container (15)
End；
Vacuum pump (25), the input first-class gauge of connection (22) of vacuum pump (25) and connecting line are provided with check valve
(23) and the 8th valve (24), the outfan of vacuum pump (25) is connected with the 5th relief valve (33)；
Described calibration system (58), including standard chamber (30) and calibrated bolck room (32), calibrated bolck room is placed with known body in (32)
Long-pending shale core sample blocks, the entrance of standard chamber (30) connects the outlet of check valve (23), and is provided with the 9th on pipeline
Valve (26), temperature sensors of high precision (27), the 4th pressure transducer (28) and the 4th relief valve (29), outlet is through the tenth valve
(31) connection standard block room (32)；
Tail gas recycle bottle (56), connects the outfan of fill out sand tube (41)；
Back pressure control system (59), is used for controlling fill out sand tube outlet pressures, simulates stressor layer state truly, and it includes 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), outfan takes back pressure buffer container (52) arrange the 14th valve (51) in its pipeline, back pressure buffer container (52) with
Connecting line between 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 sequentially connected with second gauge (53), infrared gas divides
Analyzer (54), the 15th valve (55) and tail gas recycle container (56)；
Infrared gas analyser (54), is arranged on the connecting line of fill out sand tube (41) and tail gas recycle bottle (56)；
It is characterized in that, comprise the steps:
Step 1, sets experimental temperature to calorstat (40)；
Step 2, test experience device sealing；
Step 3, operation calibration system (58), utilize the state equation law of gas to demarcate from the 4th valve (13) and the 7th valve (21)
Manifold volume between back-pressure valve (46)；
Step 4, opens vacuum pump (25), to device evacuation, arranges the pressure of back-pressure valve (46)；
Step 5, first provides CH4The CH of gas cylinder (17)4Gas boosting, by hydraulic pressure power-driven system (57) to fill out sand tube
(41) CH is injected in4Gas, the data of the record first-class gauge of fill out sand tube (41) arrival end (22), keep fill out sand tube (41) and phase
Close device constant temperature and pressure certain time to saturated；
Step 6, is continually fed into CO with constant flow2, simulate CO2The dynamic process of displacement shale gas, until fill out sand tube (41) goes out
Mouth end effluent air can't detect CH4Till, the first-class gauge of real time record (22), second gauge (53) and red therebetween
The data of outside line gas analyser (54)；
Step 7, calculates CH according to experimental data4Adsorbance and CO2Displacement shale tolerance, test and assess CO2Displacement CH4Effect；
Step 8, change experiment set temperature, pressure, repeat above step, obtain the relation between force-displacement tolerance,
Relation between temperature displacement tolerance, thus study the CO of different temperatures, pressure, flow velocity2Under different temperatures, pressure condition
Replacement result to shale gas.
Simulate CO the most according to claim 12The method of displacement displacement shale pneumatic state process, it is characterised in that described back-up sand
Pipe (41) is connected with the hydraulically powered axial compression pump (38) of dependence, and axial compression pump (38) effect is to be compacted sample room (43) interior slate flour
On, the pressured state of shale under simulation stratum condition, the input of axial compression pump (38) connects the second reservoir (36) and at pipeline
On be provided with the 11st valve (37), outfan connects the input of fill out sand tube (41) and is provided with the 12nd valve (39) on pipeline,
The input of fill out sand tube (41) is connected with the outfan of check valve (23) and arranges the 6th relief valve (34) and on pipeline
Five pressure transducers (35), outfan is sequentially connected with the 6th pressure transducer (44) and the 13rd valve (45), in fill out sand tube (41)
Portion includes sample room (43) and connects the piston with groove (42) of sample room (43), and piston (42) sets on shale side pressing close to
In respect of groove, its object is to the contact area increasing gas with shale so that gas displacement and adsorption process are carried out more
Fully.
Simulate CO the most according to claim 22The method of displacement displacement shale pneumatic state process, it is characterised in that described step
Demarcate in 3 from the manifold volume between the 4th valve (13) and the 7th valve (21) to back-pressure valve (46), comprise the following steps:
Open the 11st valve (37) and the 12nd valve (39), utilize axial compression pump (38) to add certain axial compression by sample to fill out sand tube (41)
Room (43) interior slate flour sample is compacted, and closes the 11st valve (37) and the 12nd valve (39) after compacting, open the 4th valve (13),
7th valve (21), check valve (23), the 8th valve (24), the 9th valve (26) and the 13rd valve (45), utilize vacuum pump (25) to
One piston container (7), the second piston container (15) and pipeline carry out evacuation, close the 4th valve (13), the 7th valve (21) and list
To valve (23), open the first valve (2), the 5th valve (14) and the 6th valve (16), by CH4The CH of gas cylinder (17)4Gas proceeds to second and lives
In plug container (15), it is pressurized to set pressure to the second piston container (15) with constant-flux pump (3), closes the second valve (2), the 5th valve
And the 6th valve (16) (14), after stable, slowly opening the 7th valve (21) and check valve (23), after pressure stabilisation, record is high
Accuracy temperature sensor (27) and registration T of the 4th pressure transducer (28)1And P1, take out the calibrated bolck one of calibrated bolck room (32),
Standard chamber volume is V1, the volume of calibrated bolck one is V, opens the tenth valve (31), after temperature, pressure is stable, records high accuracy
Temperature sensor (27) and registration T of the 4th pressure transducer (28)2And P2, can calculate according to equation of gas state law accordingly
Manifold volume between the 4th valve (13) and the 7th valve (21) to back-pressure valve (46):
V '=(P2T1V1+P2T1V-P1T2V1)/(P2T1-P2T1), close the 9th valve (26) after demarcation.
Simulate CO the most according to claim 22The method of displacement displacement shale pneumatic state process, it is characterised in that described step
CO is simulated in 62The dynamic process of displacement shale gas, specifically includes following steps:
Open the first valve (2), the second valve (6) and the 3rd valve (8), by CO2The CO of gas cylinder (9)2Gas proceeds to first piston container
(7) in, it is pressurized to set pressure to first piston container (7) with constant-flux pump (3), sets pressure and be slightly above back in the reasonable scope
Pressure pressure, closes the first valve (2), the second valve (6) and the 3rd valve (8), after stable, slowly opens the 4th valve (13), check valve
(23), CO is made2Fluid slowly proceeds in fill out sand tube (41), after pressure stabilisation, open the first valve (2), the second valve (6), the 3rd
Valve (8) and check valve (23), by CO2The CO of gas cylinder (9)2Gas proceeds in first piston container (7), with constant-flux pump (3) to first
Piston container (7) is pressurized to set pressure, sets pressure and is slightly above back pressure pressure in the reasonable scope, close the first valve (2), the
Two valves (6) and the 3rd valve (8), after stable, slowly open check valve, logical CO2Until port of export effluent air detects not
To CH4Till.
Simulate CO the most according to claim 22The method of displacement displacement shale pneumatic state process, it is characterised in that described step
CH is calculated in 74The method of adsorbance is as follows:
Gone out to be passed through CH by first-class gauge (22) is measurable4Cumulative volume VinCH4, the CH that is passed through4A part exists with ADSORPTION STATE absorption
On shale samples, a part is full of pipeline and volume for demarcating volume V, the temperature and pressure transmitter pressure recorded with free state
Temperature value, can calculate the CH being passed through4Quality m1 is totalWith free state CH4Quality m1 trip, do difference and i.e. can get CH4Adsorbance m1 inhales。
Simulate CO the most according to claim 22The method of displacement displacement shale pneumatic state process, it is characterised in that described step
CO is calculated in 72The method of displacement shale tolerance is as follows:
Learn according to first-class gauge (22) and be passed through CO2Cumulative volume, according to second gauge (53) and infrared gas analyzer
(54) CO is measured2Accumulative elution volume, remaining CO in the duct2Volume, temperature and pressure transmitter the pressure and temp recorded
Value, can calculate CO2Accumulative be passed through quality m2 is total, accumulative flow out quality m2 go outWith free state CO2Quality 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.
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