CN109142683A - A kind of displacement test device and experimental method - Google Patents
A kind of displacement test device and experimental method Download PDFInfo
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- CN109142683A CN109142683A CN201811096372.3A CN201811096372A CN109142683A CN 109142683 A CN109142683 A CN 109142683A CN 201811096372 A CN201811096372 A CN 201811096372A CN 109142683 A CN109142683 A CN 109142683A
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Abstract
A kind of displacement test device, including displacement fluid feed system, crude supply system, displacement system and monitoring system；The displacement system includes core model and clamper, the core model is fixed in the clamper, the arrival end of the clamper is connected with filling line, the outlet end of the clamper is connected with output pipe, a back-pressure valve is respectively provided on the filling line and output pipe, the filling line or output pipe are equipped with device for pressure measurement；The displacement fluid feed system and crude supply system are connected to the filling line；The monitoring system is set as monitoring the displacement process in the core model.The displacement test device of the embodiment of the present invention can simulate the displacement process of displacement fluid and crude oil, and can simulate the displacement process under different experiments pressure by adjusting the pressure of back-pressure valve.
Description
Technical field
This application involves Oil-Gas Field Development Engineering technical fields, and in particular to a kind of displacement test device and experimental method.
Background technique
Reduction of greenhouse gas discharge and Geological storage are increasingly subject to global concern, CO2Technology of reservoir sweep at home increasingly by
To attention.CO2Technology of reservoir sweep is divided into mixed phase drive and two kinds of non-phase-mixing driving, and theory and practice is proved the oil displacement efficiency ratio of mixed phase drive
The height of non-phase-mixing driving, both technical limits are exactly minimum miscibility pressure, that is, form the minimum pressure of mixed phase, only displacement pressure
Higher than minimum miscibility pressure, it is just able to achieve miscible-phase displacement, therefore, CO2Minimum miscibility pressure with crude oil is CO2In displacement of reservoir oil research
An important parameter, CO2The measurement of minimum miscibility pressure is driven to raising CO2Recovery ratio is driven to be of great significance.
Summary of the invention
The embodiment of the present invention provides a kind of displacement test device, including displacement fluid feed system, crude supply system,
Displacement system and monitoring system；The displacement system includes core model and clamper, and the core model is fixed on the folder
In holder, the arrival end of the clamper is connected with filling line, and the outlet end of the clamper is connected with output pipe, described
A back-pressure valve, the filling line or output pipe is respectively provided on filling line and output pipe to fill equipped with pressure measurement
It sets；The displacement fluid feed system and crude supply system are connected to the filling line；The monitoring system is set as
Monitor the displacement process in the core model.
The embodiment of the present invention also provides a kind of method for carrying out displacement test using the displacement test device, comprising:
The crude supply system injects crude oil to the core model of the displacement system, keeps saturation in core model former
Oil；
Adjust described two back-pressure valves pressure be experimental pressure after, the displacement fluid feed system is to the displacement system
The core model of system injects displacement fluid；
The monitoring system monitors the displacement process in the core model.
The utility model has the advantages that
The displacement test device of the embodiment of the present invention, can simulate the displacement process of displacement fluid and crude oil, and can be with
The displacement process under different experiments pressure is simulated by adjusting the pressure of back-pressure valve.
Detailed description of the invention
Attached drawing is used to provide one for further understanding technical solution of the embodiment of the present invention, and constituting specification
Point, it is used to explain the present invention the technical solution of embodiment together with embodiments of the present invention, does not constitute to the embodiment of the present invention
The limitation of technical solution.
Fig. 1 is the structural schematic diagram of the displacement test device of one embodiment of the invention；
Fig. 2 is the flow chart for the experimental method that one embodiment of the invention tests displacement fluid and crude oil minimum miscibility pressure；
Appended drawing reference are as follows: 1, fluid delivery system；2, the first valve；3, crude storage container；4, the second valve；5, the 4th
Valve；6, displacement fluid storage container；7, third valve；8, the first back-pressure valve；9, device for pressure measurement；10, display device；
11, photographic device；12, clamper；13, core model；14, the second back-pressure valve；15, drain bottle.
Specific embodiment
To further illustrate the technical scheme of the present invention below with reference to the accompanying drawings and specific embodiments.It is understood that
It is that specific embodiment described herein is used only for explaining the application, rather than the restriction to the application.
Mainly there is elongated tube method for studying the experimental method of minimum miscibility pressure in some laboratories, rise bubble instrument method and disappear
Except three kinds of interfacial tension method.But this three kinds of test methods have certain drawbacks: elongated tubular passes through measurement injection pressure pair
The influence of recovery ratio determines minimum miscibility pressure, and measurement process is complicated, time-consuming long, instrument requirements are high, less economical.Boundary
Face tension disappearance method judges minimum miscibility pressure point, this method with pressure history by the interfacial tension of measurement gas and oil
It is affected by oil-gas ratio, it is not easy to control.It rises bubble instrument method and minimum miscibility pressure is judged by the change of bubble shape size, by
Human factor influences greatly, and error is relatively large.And these test methods rock core is mostly unified formulation, harvests rock core with practical
There is any discrepancy, cannot really restore harvesting environment, leads to test result and actually has gap.
As shown in Figure 1, one embodiment of the invention provides a kind of displacement test device, including displacement fluid feed system, original
Oily feed system, displacement system and monitoring system.
The displacement system includes core model 13 and clamper 12, and the core model 13 is fixed on the clamper 12
Interior, the arrival end of the clamper 12 is connected with filling line, and the outlet end of the clamper 12 is connected with output pipe, described
A back-pressure valve is respectively provided on filling line and output pipe, the filling line or output pipe are equipped with device for pressure measurement
9；The other end of the output pipe can be connected to a drain bottle 15, to collect the liquid being discharged in experimentation；The displacement
Fluid feed system and crude supply system are connected to the filling line；The monitoring system is set as monitoring the rock core
Displacement process in model 13.
The core model 13 is processed to obtain according to target reservoir formation pore structure, therefore can restore true mesh
Reservoir formation pore structure is marked, displacement test process is closer to truth.The core model 13 uses transparent material, such as
Glass material is made, in order to which the monitoring system is able to observe that the state change in core model 13, to monitor the rock
Displacement process in heart model 13.
In an exemplary embodiment, the core model 13 includes upper glass plate and lower sheet glass, lower sheet glass
Upper surface is machined with a piece of pore region, which etches according to target reservoir formation pore structure, is process, upper glass
Glass piece covers on lower sheet glass and seals the pore region of lower sheet glass.The core model 13 is equipped with and the hole
The injection hole and delivery outlet of regional connectivity, injection and output for crude oil and displacement fluid.The core model 13 is making
When, it is first distributed using the pore structure that mining site rock core CT scan obtains true core, then obtain aperture and its face through image procossing
Product distribution frequency simultaneously draws throat distribution picture, finally processes to form the hole area to flat glass using laser-engraving technique
Domain.The core model 13 is whole to be square, and side length 90-110mm, the side length of etch areas is 30-50mm, such as
45mm, pore volume 0.5mL, 38 μm of minimum-value aperture.
It is equipped with fluid infusion channel and outlet fluid in the clamper 12, one end of fluid infusion channel is institute
The arrival end of clamper 12 is stated, the injection hole sealed connection of the other end of fluid infusion channel and the core model 13 is described
One end of the delivery outlet of core model 13 and the outlet fluid is tightly connected, and the other end of the outlet fluid is
For the outlet end of the clamper 12.Duct seals the joint between the two for the core model 13 and clamper 12, can adopt
It is sealed with sealing elements such as sealing rubber rings.
Water-bath chamber is equipped in the clamper 12, it is intracavitary that the core model 13 is fixed on the water-bath, and is located at water-bath
In intracavitary water-bath medium, water-bath medium can be used to increase the confining pressure of core model 13.During displacement test, core model
Fluid is injected with inside 13, internal to have certain pressure, the confining pressure can make 13 inside and outside differential pressure of core model become smaller, avoid
Core model 13 is damaged when 13 internal pressure of core model is larger.In addition, by the temperature for adjusting the intracavitary water-bath medium of water-bath,
Displacement process under analog different target reservoir temperature.It is equipped with visual windows above the water-bath chamber, is convenient for the monitoring
Overall view examines the displacement process in core model 13.
The outside of the clamper 12 is equipped with heating mantle, and the water-bath medium that heating mantle is set as intracavitary to the water-bath carries out
Heating.By controlling the heating temperature of heating mantle, the water-bath medium that water-bath can be made intracavitary is heated to experiment required temperature, so may be used
According to different target reservoir temperature, core model 13 is made to reach corresponding target reservoir temperature.The clamper 12 can be set
It is calculated as highest and bears pressure to be 50MPa, highest heatproof is 150 DEG C, can meet the needs of simulating practical reservoir condition.
The monitoring system includes display device 10 and photographic device 11, and the photographic device 11 is set as shooting the rock
Displacement process in heart model 13, and captured image is sent to the display device 10 in real time.The photographic device 11 wraps
High speed camera is included, the top of the core model 13 is located at, high-frequency shoots image, and the state for observing displacement process becomes
Change.The display device 10 includes computer, and the data collection system in computer acquires the photographic device 11 in real time and shoots
Image, and shown.
The device for pressure measurement 9 can be pressure sensor, be used for measurement experiment pressure, and the monitoring system is also set up
For with 9 communication connection of device for pressure measurement and obtain the pressure data that the device for pressure measurement 9 measures.The monitoring system
System includes data collection system, and data collection system acquires the pressure data that the device for pressure measurement 9 measures in real time.
The displacement test device further includes temperature measuring device, and temperature measuring device is set as to rock core in experimentation
The temperature of model 13 measures.The temperature measuring device can be temperature sensor, be set as to the clamper 12
The intracavitary bath temperature of water-bath measures.
The monitoring system is also configured to and the temperature measuring device communication connection and obtains the temperature measuring device
The temperature data measured.The monitoring system includes data collection system, and data collection system acquires the temperature measurement in real time
The temperature data that device measures.
The displacement fluid feed system is set as injecting displacement fluid, displacement to the core model 13 of the displacement system
Fluid can be liquid or gas needed for displacement test, such as in the experimentation of carbon dioxide drive, the displacement
Fluid is carbon dioxide gas.
The displacement fluid feed system includes fluid delivery system 1 and displacement fluid storage container 6, the displacement fluid
Closed two spaces are separated by piston moving up and down in storage container 6, wherein a space is filled with displacement fluid, it should
Space is connected to by pipeline with the filling line of 12 arrival end of clamper, and another space passes through pipeline and the fluid conveying
The output end of device 1 is connected to.It is driven in the displacement fluid storage container 6 by the fluid that the fluid delivery system 1 exports
Piston it is mobile, so that the displacement fluid in displacement fluid storage container 6 be made to be flowed into the filling line, and be injected into rock core
In model 13.
The crude supply system is similar with the displacement fluid feed system structure, including fluid delivery system 1 and original
Oily storage container 3, the crude storage container 3 is interior to be separated into closed two spaces by piston moving up and down, wherein one
Space is filled with crude oil, which is connected to by pipeline with the filling line of 12 arrival end of clamper, and another space passes through
Pipeline is connected to the output end of the fluid delivery system 1.The original is driven by the fluid that the fluid delivery system 1 exports
Piston in oily storage container 3 is mobile, so that the crude oil in crude storage container 3 be made to be flowed into the filling line, and injects
Into core model 13.
The fluid delivery system 1 of both the displacement fluid feed system and the crude supply system can share one,
Fluid delivery system 1 can be plunger pump or other delivery pumps.The displacement fluid storage container 6 and fluid delivery system 1 and
Third valve 7 and the 4th valve 5 are respectively equipped on the pipeline of the filling line connection of 12 arrival end of clamper.The crude storage
Be respectively equipped on the pipeline that container 3 is connect with the filling line of 12 arrival end of fluid delivery system 1 and clamper the first valve 2 and
Second valve 4.By adjusting corresponding valve, crude oil and displacement fluid are implanted sequentially core model by fluid delivery system 1
In 13.
The displacement fluid feed system and the crude supply system can also use other modes to the displacement system
System injection displacement fluid and crude oil, the application is with no restriction.But mode used by the present embodiment is more advantageous to low dose of displacement
The injection of fluid and crude oil, facilitates experimental implementation.
The embodiment of the present invention also provides a kind of method for carrying out displacement test using the displacement test device, including such as
Lower step:
The crude supply system injects crude oil to the core model of the displacement system, keeps saturation in core model former
Oil；
Adjust described two back-pressure valves pressure be experimental pressure after, the displacement fluid feed system is to the displacement system
The core model of system injects displacement fluid；
The monitoring system monitors the displacement process in the core model.
As shown in Fig. 2, in a specific embodiment, utilizing the displacement test device to test CO2It is mixed with crude oil minimum
The method of phase pressure, includes the following steps:
S1, the crude supply system inject crude oil to the core model of the displacement system, make saturation in core model
Crude oil；
After S2, the pressure for adjusting described two back-pressure valves are experimental pressure, the displacement fluid feed system is to the drive
Displacement fluid is injected for the core model of system；
S3, the monitoring system monitor in the core model crude oil and displacement fluid whether mixed phase；
Such as non-mixed phase, then the experimental pressure is increased, repeat step S1~S3, until mixed phase, then the pressure measurement fills
Set the minimum miscibility pressure that the pressure measured is crude oil Yu the displacement fluid.
In conjunction with attached drawing 1, the following detailed description of the utilization displacement test device to test CO2With crude oil minimum miscibility pressure
Method.
According to target reservoir formation pore throat structure, core model 13 is processed；Acquisition target reservoir crude oil sample simultaneously measures mesh
Mark reservoir temperature；Crude oil sample is full of to the top of crude storage container 3；Use CO2Full of the upper of displacement fluid storage container 6
Portion；Regulation experiment temperature, such as 40 DEG C, make temperature target reservoir temperature locating for core model 13；In core model 13
It is saturated crude oil；Experimental pressure, such as CO are adjusted according to requirement of experiment2Injection pressure is 8MPa, injects CO into core model 132
Simulate displacement process；Observe photographic device 11 (photo is acquired with 100 frames rate per second using high speed camera) shooting figure
As Crude Oil and CO2The state of two-phase interface, judges crude oil and CO2Whether mixed phase；If not up to mixed phase repeats the steps of:
It is saturated crude oil in core model 13, experimental pressure is turned up, injects CO into core model 132Displacement process is simulated, observation is taken the photograph
As device 11 shoots image Crude Oil and CO2The state of two-phase interface；Until not observing CO2With the phase interface of crude oil, that is, reach
Mixed phase state, then this time experimental pressure measured by device for pressure measurement 9 is CO2With the minimum miscibility pressure of crude oil.
The method that crude oil is saturated in core model 13 are as follows: close on 6 both ends pipeline of displacement fluid storage container
Third valve 7 and the 4th valve 5 open the first valve 2 and the second valve 4 on 3 both ends pipeline of crude storage container, starting stream
Crude oil is injected core model 13 by body conveying device 1, until saturation.
It is described that experimental pressure, such as CO are adjusted according to requirement of experiment2Injection pressure is 8MPa, is injected into core model 13
CO2The method for simulating displacement process are as follows: close the first valve 2 and the second valve 4 on 3 both ends pipeline of crude storage container, open
The third valve 7 and the 4th valve 5 on 6 both ends pipeline of displacement fluid storage container are opened, by the first back-pressure valve 8 and the second back-pressure valve
14 pressure is adjusted to 8MPa, starts fluid delivery system 1 for CO2It injects in core model 13.
In experimentation, the pressure in the core model 13 is controlled by the first back-pressure valve 8 and the second back-pressure valve 14；
Data collection system in the monitoring system acquires the image and the pressure that photographic device 11 is shot during mixed phase in real time
The temperature data that the pressure data and temperature measuring device that force measuring device 9 measures measure.
Above-mentioned experimental results are as shown in table 1, compare the test method of the present embodiment and the result of other test methods
As shown in table 2.
1 CO of table2With crude oil contact condition with pressure changing
As shown in Table 1, surveyed Reservoir Crude Oil interface of oil and gas when pressure is 10.3MPa fades away, and starts mixed phase occur,
10.3MPa is the Reservoir Crude Oil minimum miscibility pressure, and the testing time 2 hours.The surveyed practical reservoir pressure of oil reservoir is
15.6MPa, CO in displacement process2It can reach mixed phase.
Measurement result of the 2 three kinds of distinct methods of table to same oil reservoir minimum miscibility pressure
As shown in Table 2, the present embodiment measurement method measurement minimum miscibility pressure time greatly shorten, compare other two
Complete measurement in the measurement method used time 2 hours of 13 days and 7 days of kind method, the present embodiment；Minimum mixed phase obtained by three kinds of methods
Pressure value is close, it is known that the method for the present embodiment ensure that measurement quality under the premise of shortening the time.
The experimental provision structure of the embodiment of the present invention is simple, test method is easy to operate, compares other test methods not only
It has ensured the accurate, accurate of test result, the testing time is more greatly shortened, improves conventional efficient.
In the experimental provision of the embodiment of the present invention, the core model is by simulation oil reservoir formation pore structure processing
At, it tests crude oil and temperature is identical as target reservoir, experimentation and true stratum CO2Oil displacement process is identical, acquisition
Under data and formation condition more closely, thus it is more accurate.
In the experimental provision of the embodiment of the present invention, using microcosmic visual core model and monitoring system, monitoring system
Mixed phase state picture, pressure and the temperature data of mixed phase process can be acquired in real time, realize crude oil and CO2The dynamic of system mixed phase can
Depending on change process, displacement process is more intuitive, the CO shown according to monitoring system2With the phase boundary surface state of crude oil, can analyze really
Determine minimum miscibility pressure.
Claims (10)
1. a kind of displacement test device, it is characterised in that: including displacement fluid feed system, crude supply system, displacement system
And monitoring system；
The displacement system includes core model and clamper, and the core model is fixed in the clamper, the clamping
The arrival end of device is connected with filling line, and the outlet end of the clamper is connected with output pipe, the filling line and output
A back-pressure valve is respectively provided on pipeline, the filling line or output pipe are equipped with device for pressure measurement；
The displacement fluid feed system and crude supply system are connected to the filling line；
The monitoring system is set as monitoring the displacement process in the core model.
2. displacement test device as described in claim 1, it is characterised in that: the core model is made of transparent material.
3. displacement test device as claimed in claim 2, it is characterised in that: the monitoring system includes display device and camera shooting
Device, the photographic device is set as shooting the displacement process in the core model, and captured image is sent in real time
The display device.
4. displacement test device as described in claim 1, it is characterised in that: the monitoring system is also configured to and the pressure
Measuring device communication connection simultaneously obtains the pressure data that the device for pressure measurement measures.
5. displacement test device as described in claim 1, it is characterised in that: be equipped with water-bath chamber, the rock in the clamper
Heart model is fixed in the intracavitary water-bath medium of the water-bath.
6. displacement test device as claimed in claim 5, it is characterised in that: the outside of the clamper is equipped with heating mantle, adds
The water-bath medium that hot jacket is set as intracavitary to the water-bath heats.
7. displacement test device as claimed in claim 5, it is characterised in that: the displacement test device further includes temperature measurement
Device, the bath temperature that temperature measuring device is set as intracavitary to the water-bath measure, and the monitoring system is also configured to
With the temperature measuring device communication connection and obtain the temperature data that the temperature measuring device measures.
8. displacement test device as described in claim 1, it is characterised in that: the displacement fluid feed system is set as to institute
The core model injection displacement fluid of displacement system is stated, the displacement fluid is carbon dioxide gas.
9. the method for carrying out displacement test using displacement test device described in claim 1, comprising:
The crude supply system injects crude oil to the core model of the displacement system, makes to be saturated crude oil in core model；
Adjust described two back-pressure valves pressure be experimental pressure after, the displacement fluid feed system is to the displacement system
Core model injects displacement fluid；
The monitoring system monitors the displacement process in the core model.
10. method as claimed in claim 9, it is characterised in that:
The monitoring system monitors that the displacement process in the core model includes: that the monitoring system monitors the core model
Interior crude oil and displacement fluid whether mixed phase；
Such as non-mixed phase, then the experimental pressure is increased, repeats following procedure:
The crude supply system injects crude oil to the core model of the displacement system, and core model is made to be saturated crude oil；
Adjust described two back-pressure valves pressure be experimental pressure after, the displacement fluid feed system is to the displacement system
Core model injects displacement fluid；
The monitoring system monitor in the core model crude oil and displacement fluid whether mixed phase；
Until mixed phase, then the pressure that the device for pressure measurement measures is the minimum mixed phase pressure of crude oil Yu the displacement fluid
Power.
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| CN111948107B (en) * | 2019-05-14 | 2023-05-26 | 中国石油天然气股份有限公司 | Carbon dioxide infiltration rock core experimental device, experimental system and experimental method |
| CN112014294A (en) * | 2020-09-11 | 2020-12-01 | 中国石油大学(华东) | Quantitative evaluation device for rock permeability damage caused by crude oil asphaltene and application thereof |
| CN114428165A (en) * | 2020-09-23 | 2022-05-03 | 中国石油化工股份有限公司 | Intermediate container and system for rock core displacement experiment |
| CN114428165B (en) * | 2020-09-23 | 2024-05-24 | 中国石油化工股份有限公司 | Intermediate container and system for rock core displacement experiment |
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Application publication date: 20190104 |