CN112727416B - In-situ microemulsion generation and oil displacement efficiency testing device and method - Google Patents
In-situ microemulsion generation and oil displacement efficiency testing device and method Download PDFInfo
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- CN112727416B CN112727416B CN201911043211.2A CN201911043211A CN112727416B CN 112727416 B CN112727416 B CN 112727416B CN 201911043211 A CN201911043211 A CN 201911043211A CN 112727416 B CN112727416 B CN 112727416B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Abstract
The invention belongs to the technical field of oil exploitation, and particularly relates to a device and a method for in-situ microemulsion generation and oil displacement efficiency testing. The device comprises a microemulsion generation system, a microcosmic oil displacement capability test system, a macroscopic oil displacement capability test system, a microscopic imaging picture acquisition system, a first valve, a second valve, a third valve and a back pressure valve; the micro-emulsion generation system comprises a porous medium simulation cavity, a micro-tube, a first temperature sensor, a second temperature sensor, a first pressure sensor, a second pressure sensor, a heating sleeve, an electrode and a flange; the microscopic oil displacement capability test system consists of a high-temperature high-pressure visual model and a light source, wherein glass plates simulating rock cores with different pore throat sizes are arranged in the high-temperature high-pressure visual model; the macroscopic oil displacement capability test system consists of a rock core holder and a pressure sensor. The device can continuously generate the microemulsion under the condition of simulating a stratum at high temperature and high pressure, and can accurately evaluate the micro-emulsion oil displacement capability.
Description
Technical Field
The invention belongs to the technical field of oil exploitation, and particularly relates to a device and a method for in-situ microemulsion generation and oil displacement efficiency testing.
Background
The development of old oil fields in the eastern part of China enters the middle and later stages of high-water-content development, the average water content is about 90 percent, the maximum water content reaches 95 percent, and the water-flooding mode is difficult to further improve the recovery ratio. In addition, the reservoir plane and longitudinal heterogeneity of most oil fields are severe, stratum conditions show a deterioration trend along with development, the water-flooding development efficiency is reduced year by year, the oil gas yield is poor in a high water-cut stage, the development difficulty is increased, and the economic benefit is low, so that the search of a displacement technology after water flooding is very important.
Chemical oil displacement methods such as surfactant flooding, polymer flooding, alkali-water flooding and the like are widely used in oil fields as a take-over technology after water flooding, but the methods are not suitable for development of complex oil and gas reservoirs such as low-permeability reservoirs, heavy oil reservoirs, heterogeneous reservoirs and the like, and cannot achieve the expected development effect, so related scholars propose a microemulsion oil displacement technology. The microemulsion has low interfacial tension with oil and water, has small capillary resistance, can enter a tiny pore passage, increases the sweep coefficient, reduces the injection pressure, and finally achieves the effect of improving the recovery ratio. In volume 3 of 1986 in oilfield chemistry, the article of experimental research on micelle-microemulsion displacement mechanism published by Huangyan Chao et al is recorded, and the article indicates that micelle-microemulsion displacement in tertiary oil recovery is an effective method for improving the recovery rate of crude oil. Under the experimental condition, a micelle-microemulsion system is continuously injected, and 100 percent of oil can be basically extracted; when different types of 0.1PV systems are injected, the oil displacement efficiency is reduced according to the sequence of an oil external phase, a middle phase and a water external phase, and if factors such as economy and the like are considered, the middle phase oil displacement system is the best; the oil displacement efficiency is higher when the fluidity is controlled than when the fluidity is not controlled; the lower the interfacial tension between the system and the oil, the higher the oil displacement efficiency.
In volume 17 of the fine chemical industry, liu Fang et al, which is published as the article "application of surfactant in oil exploitation" is recorded, and the article indicates that the microemulsion flooding can improve the crude oil recovery rate to 80% -90%, and that the microemulsion is interfacial-free with oil and water, i.e. has no interfacial tension and capillary resistance, has a higher sweep efficiency than common water, and is completely miscible with oil, so that the oil washing rate is very good. The microemulsion is injected into the stratum to form a slug, dissolves crude oil remained in the pores of the stratum, is separated into oil phases after reaching saturation, and is produced from a well. Liu Fang et al performed related indoor studies of microemulsion flooding with a 3.0% Yumen petroleum sulfonate-3A and 2.6% mixed alcohol (butanol and isopropanol) system having a solubilization parameter of 12 and an interfacial tension of 3.3X 10 -4 mN/m, the oil displacement efficiency (the saturation of residual oil after water flooding) can reach 94.6%, and a single-well throughput test is carried out in Yumen oil field Laojun oil mine F-184 well in 1990, 12 months, so that a good application effect is obtained. In 2017, volume 34 of oilfield chemistry, a article from in-situ microemulsion flooding experimental research published by lisi yoga et al, in which in-situ microemulsion flooding based on a compound surfactant (B-1) of anion-nonionic and anion carboxylate and a mono-aralkyl sulfonate surfactant (A3-2) is researched, and the oil displacement effect of the in-situ microemulsion and surfactant/polymer binary composite flooding is analyzed and compared, and the research result shows that the oil displacement effect of the in-situ microemulsion flooding is better than that of the surfactant/polymer binary composite flooding. The in-situ microemulsion flooding mainly depends on the solubilization of a surfactant to form the microemulsion with crude oil in situ in a porous medium, so that the effect of miscible displacement of reservoir oil is achieved; when the crude oil is solubilized in the micelle of the microemulsion to be saturated, clustered and spotted residual oil is preferentially started through mechanisms of emulsification carrying, reduction of oil-water interfacial tension, improvement of wettability and the like, so that various types of residual oil are effectively started and transported.
Microemulsion flooding is a chemical oil displacement method with higher displacement efficiency, is well applied to tertiary oil recovery of low-permeability reservoirs, and mainly depends on the solubilization of a surfactant to generate microemulsion with crude oil in situ in a stratum porous medium, so that the miscible oil displacement effect is achieved; when the solubilized crude oil is saturated, the continuous sheet residual oil, cluster residual oil, dispersed residual oil and the like are started by mechanisms of reducing the oil-water interfacial tension, emulsifying carrying, improving wettability and the like, so that the continuous sheet residual oil, the cluster residual oil, the dispersed residual oil and the like are effectively transported, and the aim of recovery is fulfilled. However, the performance of the in-situ microemulsion can be influenced by multiple factors such as reservoir temperature, pressure, pore structure, formation water mineralization, crude oil property and the like, and the properties of the microemulsion itself and the like, and the comprehensive effect of the factors directly influences the recovery ratio of microemulsion flooding. Therefore, it is necessary to simulate the complex and harsh conditions in the oil reservoir, generate the microemulsion in situ with the crude oil by the surfactant and test the micro-emulsion oil displacement capability and the macro-emulsion oil displacement capability. The traditional microcosmic visual model has a simpler structure, can realize relatively fewer simulation conditions, can not be combined with an in-situ microemulsion generation system, a microcosmic oil displacement capability test and a macroscopic oil displacement capability test, can realize fewer functions, and is difficult to realize in-situ microemulsion generation and oil displacement efficiency test under complex oil reservoir conditions. Taking the chinese patent application No. 201621178261.3 as an example, the designed microscopic visualization system comprises an observation and collection system and a driving system, chemical agents are injected through a water injection pump and an intermediate container, and the flow characteristics of the fluid can be observed through the collection system. The limitations of such devices are mainly reflected in the following points:
the first is that the generation conditions of the chemical agent under the high-temperature and high-pressure conditions are not considered, the temperature, pressure and residual oil conditions cannot be monitored in real time, and the chemical agent cannot be enabled to continuously generate the oil displacement agent under the high-temperature and high-pressure simulated formation conditions.
Secondly, the device does not consider the accurate evaluation oil displacement agent ability of flooding, and traditional microcosmic visual displacement model design is too simple, and realizable function is less.
Thirdly, the device does not consider the high-pressure environment of the stratum during displacement, and complex oil reservoir conditions are difficult to realize; this design does not replenish the crude oil in the photolithographic glass sheet in a timely manner.
Disclosure of Invention
Aiming at the defects, the invention provides the in-situ microemulsion generation and oil displacement efficiency testing device and the method, which can monitor the conditions of temperature, pressure and residual oil in real time, supplement crude oil in time, control the system temperature, enable the system to generate the microemulsion continuously under the condition of simulating a stratum at high temperature and high pressure, and accurately evaluate the micro oil displacement capability of the microemulsion.
In order to achieve the purpose, the invention adopts the following technical scheme:
one of the main purposes of the invention is to provide an in-situ microemulsion generation and oil displacement efficiency testing device, which comprises a microemulsion generation system, a microcosmic oil displacement capability testing system, a macroscopic oil displacement capability testing system, a microscopic imaging picture acquisition system, a first valve, a second valve, a third valve and a back pressure valve;
the micro-emulsion generation system is connected with the microscopic oil displacement capability test system through a first valve and a second valve, and the micro-emulsion generation system is connected with the macroscopic oil displacement capability test system through a first valve and a third valve; the macroscopic oil displacement capacity testing system is connected with the microscopic oil displacement capacity testing system in parallel, and a back pressure valve is connected behind the parallel pipelines; and the microscopic oil displacement capability test system is connected with the microscopic imaging picture acquisition system.
The micro-emulsion generation system comprises a porous medium simulation cavity, a micro-tube, a temperature sensor, a pressure sensor, a heating jacket, an electrode and a flange; the temperature sensor and the pressure sensor are respectively arranged at the inlet end and the outlet end of the microemulsion generation system, the microtube is inserted into the porous medium simulation cavity, the electrode is positioned in the porous medium simulation cavity, the heating sleeve is positioned on the surface layer of the porous medium simulation cavity, and the port of the microemulsion generation system is fixed by a flange.
And a heating sleeve is arranged on the outer side of the porous medium model, and a temperature sensor is arranged in the porous medium model and is respectively arranged at the inlet end and the outlet end of the microemulsion generation system. The design can realize the simulation of the high-temperature condition of the stratum oil reservoir and monitor the temperature change in the microemulsion generation system in real time. The injection end is connected with the porous medium model through a pipeline, and the high-pressure condition of the stratum oil deposit is simulated by controlling the injection speed and the injection pressure. Meanwhile, pressure sensors are arranged in the porous medium model and are respectively arranged at the inlet end and the outlet end of the microemulsion generation system, so that the pressure change in the microemulsion generation system can be monitored in real time.
The microscopic oil displacement capability test system consists of a high-temperature high-pressure visual model and a light source, wherein glass plates with different pore throat sizes of a simulated rock core are arranged in the high-temperature high-pressure visual model, and the glass plates with different pore throat sizes of the simulated rock core, namely a glass plate with the average pore throat radius size from top to bottom, of which the average pore throat radius size is 0.5 mu m, a glass plate with the average pore throat radius size of which the average pore throat radius size is 5 mu m and a glass plate with the average pore throat radius size of which the average pore throat radius size is 2 mu m are respectively arranged; the design can simulate the dominant water flow channel formed by oil reservoir development, is favorable for analyzing the dynamic characteristics and the change of a flow field of fluid in the core models with different pore throat sizes, and is favorable for researching the influence of the core models with different pore throat sizes on the recovery ratio.
The upper end and the lower end of the high-temperature high-pressure visual model are respectively provided with a crude oil supplementing pipeline; the two sides are connected with an inlet and outlet pipeline; the design can supplement crude oil in time, and is beneficial to observing experimental phenomena of solubilization of oil and water by microemulsion, emulsification carrying of crude oil and the like; the method has the advantages that operation steps are simplified, the micro core model does not need to be disassembled in a saturated oil experiment stage, continuity of the experiment process is guaranteed, working efficiency can be increased, airtightness of the microcosmic oil displacement capability testing device is guaranteed, and influence of bubbles on the experiment is effectively avoided.
The light source is an LED plane light source.
The macroscopic oil displacement capability test system consists of a rock core holder and a pressure sensor; the macroscopic oil displacement capability test system is connected with the microscopic oil displacement capability test system in parallel, and a back pressure valve is connected behind the parallel pipelines.
The microscopic imaging picture acquisition system consists of a microscope, an industrial camera, a computer and a transverse double-arm universal support, wherein the industrial camera is connected with the microscope and is fixed through the transverse double-arm universal support, and the industrial camera is simultaneously connected with the computer.
Preferably, the porous medium simulation cavity is filled with glass sand, quartz sand or crushed natural rock core with micron-sized granularity.
Preferably, the diameter of the microtube is 0.5mm.
The invention also provides a method for in-situ microemulsion generation and oil displacement efficiency test, which comprises the following steps:
(1) Filling microemulsion generation cavity
Filling oil sand particles capable of simulating a stratum into the porous medium simulation cavity according to the microemulsion generation condition and the oil reservoir characteristics to be simulated, and then fastening flanges at two ends;
(2) Device connection
The micro-emulsion generation system, the microcosmic oil displacement capability test system, the macroscopic oil displacement capability test system, the microscopic imaging picture acquisition system and the back pressure valve are connected;
(3) Microemulsion generation
Opening a first valve, a second valve and a third valve to enable the system to form a passage, then injecting a surfactant into the inlet end of the microemulsion generation system, simultaneously opening a temperature sensor, a pressure sensor and an electrode monitor, monitoring the temperature, the pressure and the change of the residual oil in the porous medium simulation cavity in real time, filling oil into the porous medium simulation cavity through a micro-tube when the residual oil is insufficient, and closing the first valve, the second valve and the third valve in time when the generated microemulsion reaches the outlet end of the microemulsion generation system;
(4) Microcosmic oil displacement capability test
When the microscopic displacement capacity is measured, opening the first valve and the second valve, keeping the closed state of the third valve, allowing the generated microemulsion to enter a microscopic displacement capacity testing system through a pipeline, displacing residual oil in a microscopic pore throat by the microemulsion, collecting the extracted liquid after a period of time, and calculating the recovery ratio according to the result; in the whole micro-displacement process, an LED plane light source is turned on, and the processes of oil drop deformation, emulsification and dispersion under the action of the micro-emulsion are observed and recorded by a microscope and an industrial camera;
(5) Macroscopic oil displacement capability test
When measuring the macroscopic displacement capacity, opening the first valve, the third valve and the pressure sensor, keeping the closed state of the second valve, enabling the generated microemulsion to enter a macroscopic displacement capacity test system through a pipeline, collecting the extracted liquid after a period of time, and calculating the recovery ratio according to the result.
The invention has the beneficial effects that:
firstly, the microemulsion generation system of the device can automatically generate the microemulsion, monitor the conditions of temperature, pressure and residual oil in real time, supplement crude oil in time and control the temperature of the system, so that the device can continuously generate the microemulsion under the condition of simulating a stratum at high temperature and high pressure.
The device can simulate the flow of the microemulsion fluid in the porous medium under the high-temperature and high-pressure conditions of the stratum, clearly observe the flow characteristics of the microemulsion, monitor the displacement dynamics of the microemulsion in real time and accurately evaluate the micro oil displacement capability of the microemulsion; the device can also evaluate the oil displacement capability of the microemulsion system on a macroscopic level.
Thirdly, the high-resolution microscopic imaging picture acquisition system of the device can monitor the distribution state of oil and water in the porous medium in real time, and is helpful for developing researches on an oil displacement mechanism, a microscopic seepage oil increase rule and the distribution of residual oil.
Drawings
Fig. 1 is a schematic view of the overall structure of the device of the present invention:
fig. 2 is a micro-emulsion oil displacement microscopic visualization diagram in the photoetching core model with different permeability: permeability shown as A is 3490X 10 -3 μm 2 And permeability shown by B is 114X 10 -3 μm 2 And permeability as indicated by C of 27X 10 -3 μm 2 。
In the figure: 1. a microemulsion generation system; 2. a microcosmic oil displacement capability test system; 3. a macroscopic oil displacement capability test system; 4. a microscopic imaging picture acquisition system; 5. a porous medium simulation cavity; 6. a microtube; 7-1, a first temperature sensor; 7-2, a second temperature sensor; 8. a flange; 9. heating a jacket; 10. an electrode; 11-1, a first pressure sensor; 11-2, a second pressure sensor; 12. a first valve; 13. a second valve; 14. a third valve; 15. a glass plate having an average pore throat radius size of 0.5 μm; 16. a glass plate having an average pore throat radius size of 5 μm; 17. a glass plate having an average pore throat radius size of 2 μm; 18. an LED planar light source; 19. a core holder; 20. a third pressure sensor; 21. an industrial camera; 22. a microscope; 23. a transverse double-arm gimbal; 24. a computer; 25. a crude oil make-up conduit; 26. a back pressure valve.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the features, steps, operations and/or combinations thereof.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
Examples
As shown in fig. 1, the in-situ microemulsion generation and oil displacement efficiency testing device comprises a microemulsion generation system 1, a microscopic oil displacement capability testing system 2, a macroscopic oil displacement capability testing system 3, a microscopic imaging picture acquisition system 4, a first valve 12, a second valve 13, a third valve 14 and a back pressure valve 26;
the micro-emulsion generation system 1 is connected with the microscopic oil displacement capability test system 2 through a first valve 12 and a second valve 13, and the micro-emulsion generation system 1 is connected with the macroscopic oil displacement capability test system 3 through the first valve 12 and a third valve 14; the macroscopic oil displacement capability test system 3 is connected with the microscopic oil displacement capability test system 2 in parallel, and a back pressure valve 26 is connected behind the parallel pipelines; the microscopic oil displacement capability test system 2 is connected with the microscopic imaging picture acquisition system 4;
the micro-emulsion generation system comprises a porous medium simulation cavity 5, a micro-tube 6, a temperature sensor 7, a pressure sensor 11, a heating jacket 9, an electrode 10 and a flange 8; the micro-emulsion generating system comprises a first temperature sensor 7-1, a first pressure sensor 11-1, a second temperature sensor 7-2 and a second pressure sensor 11-2, wherein the first temperature sensor and the second pressure sensor are positioned at the inlet end of the micro-emulsion generating system, the micro-tube 6 is inserted into a porous medium simulation cavity 5, an electrode 10 is positioned in the porous medium simulation cavity 5, a heating sleeve 9 is positioned on the surface layer of the porous medium simulation cavity, and the port of the micro-emulsion generating system is fixed by a flange 8;
the microscopic oil displacement capability test system consists of a high-temperature high-pressure visual model and a light source, wherein glass plates with different pore throat sizes of a simulated rock core are arranged in the high-temperature high-pressure visual model, and the average pore throat radius sizes from top to bottom of the glass plates with different pore throat sizes of the simulated rock core are respectively 0.5 mu m glass plate 15, 5 mu m glass plate 16 and 2 mu m glass plate 17; the upper end and the lower end of the high-temperature high-pressure visual model are respectively provided with a crude oil supplementing pipeline; the two sides are connected with an inlet and outlet pipeline; the light source is an LED planar light source 18.
The macroscopic oil displacement capability test system 3 consists of a rock core holder 19 and a third pressure sensor 20; the material of the clamp holder is Hastelloy.
The microscopic imaging picture acquisition system 4 consists of a microscope 22, an industrial camera 21, a computer 24 and a transverse double-arm universal support 23, wherein the industrial camera 21 is connected with the microscope 22 and fixed through the transverse double-arm universal support 23, and the industrial camera 21 is simultaneously connected with the computer 24.
The porous medium simulation cavity is filled with glass sand, quartz sand or crushed natural rock core with micron-sized granularity.
The diameter of the micro-tube is 0.5mm, and the material is hastelloy.
An in-situ microemulsion generation and oil displacement efficiency testing method comprises the following steps:
(1) Filling microemulsion generation cavity
Filling oil sand particles capable of simulating a stratum into the porous medium simulation cavity according to the microemulsion generation condition and the oil reservoir characteristics to be simulated, and then fastening flanges at two ends;
(2) Device connection
The micro-emulsion generation system, the microscopic oil displacement capability test system, the macroscopic oil displacement capability test system, the microscopic imaging picture acquisition system and the back pressure valve are connected;
(3) Microemulsion generation
Opening a first valve, a second valve and a third valve to enable the system to form a passage, then injecting a surfactant into the inlet end of the microemulsion generation system, simultaneously opening a temperature sensor, a pressure sensor and an electrode monitor, monitoring the temperature, the pressure and the change of the residual oil in the porous medium simulation cavity in real time, filling oil into the porous medium simulation cavity through a micro-tube when the residual oil is insufficient, and closing the first valve, the second valve and the third valve in time when the generated microemulsion reaches the outlet end of the microemulsion generation system;
(4) Microcosmic oil displacement capability test
When the microscopic displacement capacity is measured, opening the first valve and the second valve, keeping the closed state of the third valve, allowing the generated microemulsion to enter a microscopic displacement capacity testing system through a pipeline, displacing residual oil in a microscopic pore throat by the microemulsion, collecting the extracted liquid after a period of time, and calculating the recovery ratio according to the result; in the whole micro-displacement process, an LED plane light source is turned on, and the processes of oil drop deformation, emulsification and dispersion under the action of the micro-emulsion are observed and recorded by a microscope and an industrial camera;
(5) Macroscopic test of oil displacement capability
When measuring the macroscopic displacement capacity, opening the first valve, the third valve and the pressure sensor, keeping the closed state of the second valve, enabling the generated microemulsion to enter a macroscopic displacement capacity test system through a pipeline, collecting the extracted liquid after a period of time, and calculating the recovery ratio according to the result.
The results of the test using the apparatus of the present invention are shown in FIG. 2.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (6)
1. An in-situ microemulsion generation and oil displacement efficiency testing device is characterized by comprising a microemulsion generation system, a microscopic oil displacement capability testing system, a microscopic imaging picture acquisition system, a first valve, a second valve, a third valve and a back pressure valve; the micro-emulsion generation system is connected with the microscopic oil displacement capability test system through the first valve and the second valve; the microscopic oil displacement capability test system is connected with the microscopic imaging picture acquisition system;
the micro-emulsion generation system comprises a porous medium simulation cavity, a micro-tube, a temperature sensor, a pressure sensor, a heating jacket, an electrode and a flange; the temperature sensor and the pressure sensor are respectively arranged at the inlet end and the outlet end of the microemulsion generation system, the micro-tube is inserted into the porous medium simulation cavity, the electrode is positioned in the porous medium simulation cavity, the heating sleeve is positioned on the surface layer of the porous medium simulation cavity, and the port of the microemulsion generation system is fixed by a flange;
the microscopic oil displacement capability test system consists of a high-temperature high-pressure visual model and a light source, wherein glass plates with different pore throat sizes of a simulated rock core are arranged in the high-temperature high-pressure visual model, the glass plates with different pore throat sizes of the simulated rock core, the glass plates with the average pore throat radius sizes from top to bottom are respectively 0.5 mu m, 5 mu m and 2 mu m; the upper end and the lower end of the high-temperature high-pressure visual model are respectively provided with a crude oil supplementing pipeline; the two sides are connected with an inlet and outlet pipeline; the light source is an LED plane light source;
the macroscopic oil displacement capability test system consists of a rock core holder and a pressure sensor; the micro-emulsion generation system is connected with the macroscopic oil displacement capability test system through the first valve and the third valve; the macroscopic oil displacement capability test system is connected with the microscopic oil displacement capability test system in parallel, and a back pressure valve is connected behind the parallel pipelines.
2. The device of claim 1, wherein the microscopic imaging picture acquisition system is composed of a microscope, an industrial camera, a computer and a transverse double-arm universal support; the industrial camera is connected with the microscope and fixed through a transverse double-arm universal support, and the industrial camera is connected with the computer at the same time.
3. The device according to claim 1, wherein the porous medium simulation cavity is filled with glass sand, quartz sand or crushed natural core with micron-sized granularity.
4. The device of claim 1, wherein the diameter of the microtube is 0.5mm.
5. The oil displacement efficiency testing method using the in-situ microemulsion generation and oil displacement efficiency testing device of claim 1, is characterized by comprising the following steps:
(1) Filling microemulsion generation cavity
Filling oil sand particles of a simulated stratum into the porous medium simulation cavity according to the microemulsion generation condition and the oil reservoir characteristics to be simulated, and then fastening flanges at two ends;
(2) Device connection
The micro-emulsion generation system, the microcosmic oil displacement capability test system, the macroscopic oil displacement capability test system, the microscopic imaging picture acquisition system and the back pressure valve are connected;
(3) Microemulsion generation
Opening a first valve, a second valve and a third valve to enable the system to form a passage, then injecting a surfactant into the inlet end of the microemulsion generation system, simultaneously opening a temperature sensor, a pressure sensor and an electrode monitor, monitoring the temperature, the pressure and the change of the residual oil in the porous medium simulation cavity in real time, supplementing oil into the porous medium simulation cavity through a micro-tube when the residual oil is insufficient, and timely closing the first valve, the second valve and the third valve when the generated microemulsion reaches the outlet end of the microemulsion generation system;
(4) Testing the microscopic oil displacement capability;
(5) Macroscopic oil displacement capability test
When measuring the macroscopic displacement capacity, opening the first valve, the third valve and the pressure sensor, keeping the second valve in a closed state, allowing the generated microemulsion to enter a macroscopic displacement capacity test system through a pipeline, collecting the extracted liquid after a period of time, and calculating the recovery ratio according to the result.
6. The method of claim 5, wherein the microscopic oil displacement capability test comprises the following specific steps: opening the first valve and the second valve, keeping the third valve in a closed state, allowing the generated microemulsion to enter a microscopic oil displacement capability test system through a pipeline, displacing residual oil in a microscopic pore throat by the microemulsion, collecting the extracted liquid after a period of time, and calculating the recovery ratio according to the result; in the whole micro-displacement process, an LED plane light source is turned on, and the processes of deformation, emulsification and dispersion of oil drops under the action of the microemulsion are observed and recorded by a microscope and an industrial camera.
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