CN108956385A - A kind of experimental system and its experimental method of gas diffusion migration - Google Patents
A kind of experimental system and its experimental method of gas diffusion migration Download PDFInfo
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Abstract
Present description provides the experimental systems and its experimental method of a kind of migration of gas diffusion, the system includes: basic environment simulator, for simulating the base state for being adsorbed with corresponding gas under geological conditions in rock core, basic environment simulator includes basic rock sample room, and exhaust part and gas injection section, basic rock sample room includes the first core holding unit, is provided with first gas concentration detector and first pressure gauge on the first core holding unit exterior tubing；Diffusion And Movement simulator comprising at least one diffusion And Movement rock sample room, diffusion And Movement rock sample room include the second core holding unit, are provided with second gas concentration detector and second pressure gauge on the exterior tubing of the second core holding unit；It is connected to or the first valve of non-interconnected state for being in basic environment simulator and diffusion And Movement simulator.It is a kind of experimental program of the gas diffusion migration of high reliablity, especially for the research of shale gas diffusion And Movement.
Description
Technical field
This specification is related to the experimental system and its experimental method of a kind of gas diffusion migration.
Background technique
Shale gas is a kind of gas accumulation of typical self-generation, self-reservoir at hiding, with a difference of conventional gas it
Place is the migration for assembling and not undergoing nearby relatively long distance after shale gas generates in source bed.There is this just because of shale gas
The typical original place Reservoir model of kind, forefathers usually ignore the diffusion And Movement process of shale gas in the course of the research.However actually
The diffusion And Movement of shale gas is for shale gas at keeping great influence, it is therefore necessary to go deep into the expansion of systematic research shale gas
Migration process is dissipated so as to the reservoiring mechanism of clear shale gas, improves the exploration efficiency of shale gas.
Have at present and has studied shale gas diffusion fortune with the method for numerical simulation in hydromechanical theoretical basis
The method of shifting.But the method accuracy of numerical simulation is poor, cannot reflect the process of shale gas diffusion And Movement well.
Summary of the invention
The experimental system and its experimental method for being designed to provide a kind of analog gas diffusion migration of this specification.
In order to achieve the above objectives, on the one hand, present description provides a kind of experimental system of gas diffusion migration, the systems
Include:
Basic environment simulator；The basic environment simulator is adsorbed with phase for simulating in rock core under geological conditions
Answer the base state of gas；The basic environment simulator includes basic rock sample room, and respectively with the basic rock sample room
The exhaust part and gas injection section of connection；The basis rock sample room includes the first core holding unit, and is connected to the first rock core
The first entrance pipeline and first outlet pipeline at clamper both ends are provided with the inspection of first gas concentration on the first outlet pipeline
Survey device and first pressure gauge；
Diffusion And Movement simulator；The diffusion And Movement simulator includes at least one diffusion And Movement rock sample room, described
Diffusion And Movement rock sample room includes the second core holding unit, and is connected to the second entrance pipe at the second core holding unit both ends
Line and second outlet pipeline are provided with second gas concentration detector and second pressure gauge on the second outlet pipeline；
For making the first core holding unit of the basic environment simulator and the second rock of diffusion And Movement simulator
Heart clamp holder is in the first valve of connection or non-interconnected state.
The experimental system for the gas diffusion migration that this specification provides, by the way that basic environment simulator simulation core is arranged
State when specific gas is stored under ground environment, and diffusion And Movement simulator simulation core is set under ground environment not
Store state when specific gas；Then it is connected to the two, so that simulate specific gas is diffused fortune between rock core
The process of shifting.The process of the diffusion And Movement of the device analog gas, and can get necessary data, it is one therefore
The experimental system of the gas diffusion migration of kind high reliablity, especially for the research of shale gas diffusion And Movement.
In the experimental system of above-mentioned gas diffusion And Movement, it is preferable that the system further includes thermostat, the basis rock
Specimen chamber and diffusion And Movement rock sample room are set in thermostat.
In the experimental system of above-mentioned gas diffusion And Movement, it is preferable that the system further includes simulating with the diffusion And Movement
The gas-metering device of device connection；The gas-metering device is used to measure in experiment from the discharge of diffusion And Movement simulator
Gas flow.
In the experimental system of above-mentioned gas diffusion And Movement, it is preferable that the diffusion And Movement simulator includes 2-4 expansion
It loads in bulk and moves rock sample room, adjacent diffusion And Movement rock sample room is connected in a series arrangement.
In the experimental system of above-mentioned gas diffusion And Movement, it is preferable that first core holding unit and the second rock core folder
Holder has the accommodating cavity of same size, for placing the rock core of same specification.
In the experimental system of above-mentioned gas diffusion And Movement, it is preferable that the exhaust part includes vacuum pump and vacuum pressure
Table, the vacuum pump are connected to the first entrance pipeline；In the pipeline that the vacuum pump is connected to the first entrance pipeline
On be provided with pressure vacuum gauge.
In the experimental system of above-mentioned gas diffusion And Movement, it is preferable that the gas injection section includes caisson, pressurizing device
With gas injection pressure table, the caisson is connected to the pressurizing device, and the pressurizing device and the first entrance pipeline connect
It is logical；Gas injection pressure table is provided on the pipeline that the pressurizing device is connected to the first entrance pipeline.
On the other hand, present description provides a kind of experimental methods for carrying out gas diffusion migration, this method comprises:
The shape of specific gas is stored under the conditions of so that the rock core being placed in the first core holding unit is in the certain stratum of simulation
State；The formation condition includes temperature and pressure；
Make the rock core being placed in the second core holding unit be in simulate certain stratum under the conditions of not stored have specific gas
State；The formation condition includes temperature and pressure；
It is connected to the first core holding unit with the second core holding unit, at this point, rock core storage in the first core holding unit
Rock core of the specific gas into the second core holding unit is diffused migration；
Obtain the specific gas for entering the second core holding unit during diffusion And Movement, being discharged from second core holding unit
The data that concentration and pressure change over time, in conjunction with the diffusion And Movement of basic data research specific gas.
In the experimental method of above-mentioned carry out gas diffusion migration, it is preferable that the basic data includes: from the second rock core
The amount of the specific gas of clamper discharge, the formation condition data of the first core holding unit and the second core holding unit.
In the experimental method of above-mentioned carry out gas diffusion migration, it is preferable that the rock core in the first core holding unit and
Rock core in two core holding units is the sample of same specification.
In the experimental method of above-mentioned carry out gas diffusion migration, it is preferable that the rock core in the first core holding unit and
Rock core in two core holding units is all the standard sample drilled through perpendicular to shale level or is all to be parallel to shale level to drill through
Standard column sample.
In the experimental method of above-mentioned carry out gas diffusion migration, it is preferable that the specific gas is methane.
Detailed description of the invention
Fig. 1 is a kind of experimental provision for gas diffusion migration that this specification embodiment provides.
Drawing reference numeral explanation:
1, vacuum pump, 2, pressure vacuum gauge, 3, evacuating valve, 4, caisson (high pressure methane), 5, pressurizing device, 6, note
Atmospheric pressure table, 7, gas injection valve, the 8, first plug, the 9, first rock sample, the 10, first core holding unit, the 11, first valve, 12,
One pressure gauge, the 13, first concentration detector (methane), the 14, first insulating box, the 15, second plug, the 16, second rock sample, 17,
Two core holding units, the 18, second valve, 19 second pressure gauges, the 20, second concentration detector (methane), the 21, second insulating box,
22, third plug, 23 third rock samples, 24, third core holding unit, 25, third valve, 26, third pressure gauge, 27, third it is dense
It spends detector (methane), 28, third insulating box, the 29, the 4th valve, 30, gas-metering device.
Specific embodiment
In order to which technical characteristic, purpose and the beneficial effect to this specification are more clearly understood, now to this specification
Technical solution carry out described further below, but should not be understood as the restriction to the enforceable range of this specification.
Referring to FIG. 1, this specification embodiment provides a kind of experimental system of gas diffusion migration, the system packet
It includes:
Basic environment simulator；Basic environment simulator is adsorbed with corresponding gas for simulating in rock core under geological conditions
The base state of body；Basic environment simulator includes basic rock sample room, and the pumping being connected to respectively with the basic rock sample room
Gas portion and gas injection section；Basic rock sample room includes the first core holding unit 10, and is connected to 10 liang of the first core holding unit
The first entrance pipeline and first outlet pipeline at end are provided with first gas concentration detector 13 and first on first outlet pipeline
Pressure gauge 12；
Diffusion And Movement simulator；Diffusion And Movement simulator includes at least one diffusion And Movement rock sample room, diffusion And Movement
Rock sample room include the second core holding unit 17, and be connected to 17 both ends of the second core holding unit second entrance pipeline and
Second outlet pipeline is provided with second gas concentration detector 20 and second pressure gauge 19 on second outlet pipeline；
For making the second rock core of the first core holding unit 10 and diffusion And Movement simulator of basic environment simulator
Clamper 17 is in the first valve 11 of connection or non-interconnected state.
In some embodiments, diffusion And Movement simulator includes 2-4 diffusion And Movement rock sample room, adjacent diffusion fortune
Rock sample room is moved to be connected in a series arrangement.Different diffusion rock sample rooms can place the rock core of identical lithology, can also place difference
The rock core of lithology.Therefore, which can simulate diffusion And Movement of the gas under different lithology combination condition.Shown in fig. 1
In embodiment, there are two diffusion And Movement rock sample room, the two serial communications for diffusion And Movement simulator.Wherein, the first diffusion fortune
It moves in rock sample room and is provided with the second core holding unit 17, the both ends of the second core holding unit 17 are connected with second entrance pipeline and the
Two outlet lines are provided with second gas concentration detector 20 and second pressure gauge 19 on second outlet pipeline.Similar, second
Third core holding unit 24 is provided in diffusion And Movement rock sample room, the both ends of third core holding unit 24 are connected with third inlet tube
Line and third outlet line are provided with third gas concentration detector 27 and third pressure gauge 26 on third outlet line.
With continued reference to Fig. 1, in this embodiment, the core holding unit serial communication in two diffusion And Movement rock sample rooms,
That is, the second outlet pipeline of the second core holding unit 17 is connected to the third suction line of third core holding unit 24.
In some embodiments, it can be set on the suction line or outlet line of the core holding unit of diffusion And Movement room
Necessary valve is set, consequently facilitating controlling the connection or blocking between adjacent core holding unit.Embodiment shown in Fig. 1
In, the second valve 18 is provided on the second outlet pipeline of the second core holding unit 17；The second of third core holding unit 24 goes out
Third valve 25 is provided on mouth pipeline.
In some embodiments, each core holding unit is the core holding unit that can provide confining pressure, is existed for simulation core
The pressure state of ground environment.Core holding unit can bear certain pressure, in the embodiment shown in figure 1, the first rock core
The maximum pressure that clamper 10, the second core holding unit 17 and third core holding unit 24 can be born is 80MPa.In addition, making
Gum cover on the side wrap of core column sample (the first rock sample 9, the second rock sample 16, third rock sample 23) can only be reserved top bottom by the used time
Face；Then the sample for wrapping gum cover is put into the inner cavity of core holding unit, and block two end faces with plug.It is visual on plug
Situation connects corresponding outlet line or suction line.Embodiment as shown in Figure 1, the both ends tool of the first core holding unit 10
There is the first plug 8；The both ends of second core holding unit 17 have the second plug 15；The both ends of third core holding unit 24 have the
Three plugs 22.
In some embodiments, for better simulated formation temperature, which further includes thermostat, wherein base
Plinth rock sample room and diffusion And Movement rock sample room can be set in a thermostat, can also be provided separately within respective constant temperature dress
In setting.In the embodiment shown in figure 1, basic rock sample room is set in insulating box 14, two diffusion And Movement rock sample room difference
It is arranged in insulating box 21 and insulating box 28.This mode being separately provided is conducive to temperature control respectively, certainly, when test can also be with
Unified temperature (for example, the temperature for simulating same stratum) is set by them.Therefore, which can simulate gas in various temperature
Diffusion And Movement under the conditions of having a meeting, an audience, etc. well under one's control.Specifically, the temperature regulating range of insulating box can be 18-120 DEG C.
In some embodiments, basic rock sample room, the core holding unit in diffusion And Movement rock sample room can be identical rule
It is lattice or different size.Same size refers to the base area and column that hold sample chamber and have identical size of core holding unit
It is high.In this case, the rock core of same specification can be placed.So as to simulate diffusion of the gas in prismatic fixed channel
Migration, convenient for analysis diffusion And Movement rule.It, can be for phase rock core for rock core, or the rock core of different lithofacies, tool
Body can according to experiment it needs to be determined that." the same to phase " of geology kind refers to the rock all the same such as mineralogical composition, structure composition of rock
Stone.
In some embodiments, which further includes the gas-metering device being connected to diffusion And Movement simulator；Gas
Body metering device is used to measure the gas flow being discharged in experiment from diffusion And Movement simulator.In embodiment shown in fig. 1,
Gas-metering device 30 is arranged outside diffusion And Movement simulator, and the two is connected to by pipeline.It is provided on connecting pipeline
4th valve 29.
In some embodiments, the specific setting for not limiting exhaust part can play the first core holding unit of extraction
Air in 10.Pressure vacuum gauge can be arranged on pumping pipeline in the case where in order to reflect pumping.Pressure vacuum gauge
Monitoring range can be -0.1 to 0MPa.In embodiment shown in fig. 1, exhaust part includes vacuum pump 1 and pressure vacuum gauge
2, vacuum pump 1 is connected to the first entrance pipeline of the first core holding unit 10；In the pipe that vacuum pump 1 is connected to first entrance pipeline
Pressure vacuum gauge 2 is provided on line.In addition, the also settable extraction valve on the pipeline that vacuum pump 1 is connected to first entrance pipeline
Door 3.
In some embodiments, the specific setting for not limiting gas injection section can be played to the first core holding unit 10
The specific gas of middle injection certain pressure.The monitoring range of gas injection pressure table can be 0 to 60MPa.In reality shown in fig. 1
It applies in mode, gas injection section includes caisson (high pressure methane) 4, pressurizing device 5 and gas injection pressure table 6；Caisson 4 and pressurization
Device 5 is connected to, and pressurizing device 5 is connected to the first entrance pipeline of the first core holding unit；In pressurizing device 5 and first entrance pipe
Gas injection pressure table 6 is provided on the pipeline of line connection.In addition, on the pipeline that pressurizing device 5 is connected to first entrance pipeline also
Settable gas injection valve 7.
Embodiment further provides the experimental methods that a kind of gas diffusion is migrated for this specification, this method comprises:
(1) specific gas is stored under the conditions of so that the rock core being placed in the first core holding unit is in the certain stratum of simulation
State；The formation condition includes temperature and pressure；
(2) not stored under the conditions of so that the rock core being placed in the second core holding unit is in the certain stratum of simulation to have specific gas
State；The formation condition includes temperature and pressure；
(3) it is connected to the first core holding unit with the second core holding unit, at this point, rock core stores in the first core holding unit
Rock core of the specific gas into the second core holding unit be diffused migration；
(4) the specific gas for entering the second core holding unit during diffusion And Movement, being discharged from the second core holding unit is obtained
The data that the concentration and pressure of body change over time, in conjunction with the diffusion And Movement of basic data research specific gas.
In some embodiments, it can be set several the second core holding units, it can be between the second core holding unit
Carry out serial communication.
In some embodiments, basic data may include: the amount for the specific gas being discharged from the second core holding unit,
The formation condition data of first core holding unit and the second core holding unit.
In some embodiments, the rock core in the rock core and the second core holding unit in the first core holding unit is with rule
The sample of lattice.In addition, two rock cores can according to need the identical or different sample of selection lithology.
In some embodiments, the rock core in the rock core and the second core holding unit in the first core holding unit is all vertical
The standard sample that directly drills through in shale level is all the standard column sample for being parallel to shale level and drilling through.
In some embodiments, specific gas is methane.
In some embodiments, the experimental provision of the gas diffusion migration provided using this specification, is carried out corresponding
Simulated experiment.
The following are the application examples for using experimental provision research shale gas diffusion And Movement shown in FIG. 1, the specific steps are as follows:
One, diffusion And Movement of the research shale gas on vertical
Three different samples of lithology are selected, drilling through column sample perpendicular to shale level, (diameter is that 2.54cm length is 3cm's
Standard column sample), it obtains the first rock sample 9, the second rock sample 16 and third rock sample 23 and only reserves gum cover on the side wrap of column sample
Top bottom surface, by the sample for wrapping gum cover by vertical sequence be respectively put into the first core holding unit 10, the second core holding unit 17,
Third core holding unit 24.
Adjusting three core holding units keeps confining pressure suffered by sample identical (i.e. the strata pressure of simulated formation), by three rock samples
The insulating box of room is adjusted to same temperature (i.e. simulated formation in-situ temperature)；Open evacuating valve 3, it is ensured that other valves are closed, and are beaten
Vacuum will be evacuated to inside first rock sample 9 by opening vacuum pump 1.Close vacuum pump 1 and evacuating valve 3, it is ensured that basic rock sample room and diffusion
Migration rock sample room is not connected to.
Gas injection valve 7, pressurizing device 5 and caisson 4 (interior storage high pressure methane) are opened, is started to the first core holding unit
The first rock sample 9 in 10 fills methane, ensures that methane can be filled in the hole of the first rock sample 9 using pressurizing device 5.When first
When the content of methane gas reaches the air content in situ of simulated formation in rock sample 9, gas injection valve 7, pressurizing device 5 and gas storage are closed
Device 4.
The first valve 11, the second valve 18, third valve 25 and the 4th valve 29 are opened, keeps shale gas spontaneous from first
In rock sample 9 into the second rock sample 16 and third rock sample 23 diffusion And Movement, pass through first pressure gauge 12, second pressure gauge 19 and third
Pressure gauge 26 records pressure in shale gas diffusion process and changes with time, and passes through the first concentration detector (methane) 13, second
Concentration detector (methane) 20 and third concentration detector (methane) 27 monitor in shale gas diffusion process methane concentration at any time
Variation.
Two, the diffusion And Movement of research shale gas horizontally
Identical three samples of lithology are selected, shale level is parallel to and drills through column sample (diameter is that 2.54cm length is 3cm's
Standard column sample), the 4th rock sample, the 5th rock sample and the 6th rock sample are obtained, by gum cover on the side wrap of column sample, only reserves top bottom
The sample for wrapping gum cover is respectively put into the first core holding unit 10, the second core holding unit 17, third by vertical sequence by face
Core holding unit 24.
According to simulated formation horizontally strata pressure variation adjust three core holding units, make to enclose suffered by three rock samples
Press it is identical as different configuration position strata pressure respectively, adjust three calorstat temperatures, make temperature suffered by three rock samples respectively with
Different configuration position formation temperature is identical；
Open evacuating valve 3, it is ensured that other valves are closed, and vacuum will be evacuated to inside the 4th rock sample by opening vacuum pump 1.It closes
Vacuum pump 1 and evacuating valve 3, it is ensured that basic rock sample room is not connected to diffusion And Movement rock sample room.
Gas injection valve 7, pressurizing device 5 and caisson 4 (interior storage high pressure methane) are opened, is started to the first core holding unit
The first rock sample 9 in 10 fills methane, ensures that methane can be filled in the hole of the 4th rock sample using pressurizing device 5.When the 4th
When the content of methane gas reaches the air content in situ of simulated formation in rock sample, gas injection valve 7, pressurizing device 5 and gas storage are closed
Device 4.
The first valve 11, the second valve 18, third valve 25 and the 4th valve 29 are opened, keeps shale gas spontaneous from the 4th
In rock sample into the 5th rock sample and the 6th rock sample diffusion And Movement, pass through first pressure gauge 12, second pressure gauge 19 and third pressure
Table 26 records pressure in shale gas diffusion process and changes with time, and passes through the 13, second concentration of the first concentration detector (methane)
Detector (methane) 20 and third concentration detector (methane) 27 monitor the change of methane concentration at any time in shale gas diffusion process
Change.
It can be seen that the experimental system and experimental method of the gas diffusion migration that this specification embodiment provides can intuitively, just
Diffusion And Movement process of the prompt observation and research shale gas in different lithology and under the conditions of different thermobaric fields.
Claims (10)
1. a kind of experimental system of gas diffusion migration, which is characterized in that the system includes:
Basic environment simulator；The basic environment simulator is adsorbed with corresponding gas for simulating in rock core under geological conditions
The base state of body；The basic environment simulator includes basic rock sample room, and is connected to respectively with the basic rock sample room
Exhaust part and gas injection section；The basis rock sample room includes the first core holding unit, and is connected to the clamping of the first rock core
The first entrance pipeline and first outlet pipeline at device both ends are provided with first gas concentration detector on the first outlet pipeline
And first pressure gauge；
Diffusion And Movement simulator；The diffusion And Movement simulator includes at least one diffusion And Movement rock sample room, the diffusion
Migrate rock sample room include the second core holding unit, and be connected to the second core holding unit both ends second entrance pipeline and
Second outlet pipeline is provided with second gas concentration detector and second pressure gauge on the second outlet pipeline；
For making the first core holding unit of the basic environment simulator and the second rock core folder of diffusion And Movement simulator
Holder is in the first valve of connection or non-interconnected state.
2. the experimental system of gas diffusion migration according to claim 1, which is characterized in that the system further includes constant temperature dress
It sets, the basis rock sample room and diffusion And Movement rock sample room are set in thermostat.
3. the experimental system of gas diffusion according to claim 1 migration, which is characterized in that the system further include with it is described
The gas-metering device of diffusion And Movement simulator connection；The gas-metering device is for measuring in experiment from diffusion And Movement mould
The gas flow of quasi- device discharge.
4. the experimental system of gas diffusion migration according to claim 1, which is characterized in that the diffusion And Movement simulation dress
It sets including 2-4 diffusion And Movement rock sample room, adjacent diffusion And Movement rock sample room is connected in a series arrangement.
5. the experimental system of gas diffusion migration according to claim 1, which is characterized in that first core holding unit
There is the accommodating cavity of same size with the second core holding unit, for placing the rock core of same specification.
6. the experimental system of gas diffusion migration according to claim 1, which is characterized in that the exhaust part includes vacuum
Pump and pressure vacuum gauge, the vacuum pump are connected to the first entrance pipeline；In the vacuum pump and the first entrance pipe
Pressure vacuum gauge is provided on the pipeline of line connection.
7. the experimental system of gas diffusion migration according to claim 1, which is characterized in that the gas injection section includes gas storage
Device, pressurizing device and gas injection pressure table, the caisson are connected to the pressurizing device, the pressurizing device and described the
The connection of one suction line；Gas injection pressure table is provided on the pipeline that the pressurizing device is connected to the first entrance pipeline.
8. a kind of experimental method for carrying out gas diffusion migration, which is characterized in that this method comprises:
The state of specific gas is stored under the conditions of so that the rock core being placed in the first core holding unit is in the certain stratum of simulation；Institute
Stating formation condition includes temperature and pressure；
The rock core being placed in the second core holding unit is set to be in the not stored state for having specific gas under the conditions of the certain stratum of simulation；
The formation condition includes temperature and pressure；
Be connected to the first core holding unit with the second core holding unit, at this point, in the first core holding unit rock core store it is specific
Rock core of the gas into the second core holding unit is diffused migration；
Obtain the concentration that diffusion And Movement enters the second core holding unit, the specific gas being discharged from the second core holding unit in the process
The data changed over time with pressure, in conjunction with the diffusion And Movement of basic data research specific gas.
9. the experimental method according to claim 8 for carrying out gas diffusion migration, which is characterized in that the basic data packet
It includes: the amount for the specific gas being discharged from the second core holding unit, the stratum item of the first core holding unit and the second core holding unit
Number of packages evidence.
10. the experimental method according to claim 8 for carrying out gas diffusion migration, which is characterized in that the clamping of the first rock core
The rock core in rock core and the second core holding unit in device is the sample of same specification；
Preferably it is all the standard sample drilled through perpendicular to shale level or is all the standard column sample for being parallel to shale level and drilling through；
It is further preferred that the specific gas is methane.
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