CN108868710A - A kind of simulation CO2The system and method handled up to the microcosmic displacement process of cecum oil - Google Patents
A kind of simulation CO2The system and method handled up to the microcosmic displacement process of cecum oil Download PDFInfo
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- CN108868710A CN108868710A CN201710326896.6A CN201710326896A CN108868710A CN 108868710 A CN108868710 A CN 108868710A CN 201710326896 A CN201710326896 A CN 201710326896A CN 108868710 A CN108868710 A CN 108868710A
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- 210000004534 cecum Anatomy 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 72
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 58
- 230000008569 process Effects 0.000 title claims abstract description 47
- 238000004088 simulation Methods 0.000 title claims abstract description 21
- 238000002347 injection Methods 0.000 claims abstract description 23
- 239000007924 injection Substances 0.000 claims abstract description 23
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 14
- 239000003921 oil Substances 0.000 claims description 77
- 239000012530 fluid Substances 0.000 claims description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 239000010779 crude oil Substances 0.000 claims description 29
- 229920006395 saturated elastomer Polymers 0.000 claims description 21
- 230000008676 import Effects 0.000 claims description 18
- 239000011435 rock Substances 0.000 claims description 17
- 239000011521 glass Substances 0.000 claims description 15
- 238000005530 etching Methods 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 239000003129 oil well Substances 0.000 abstract description 9
- 230000007246 mechanism Effects 0.000 abstract description 8
- 238000011084 recovery Methods 0.000 abstract description 6
- 230000003993 interaction Effects 0.000 abstract description 3
- 230000010354 integration Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 7
- 239000002699 waste material Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000000605 extraction Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 239000013043 chemical agent Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/164—Injecting CO2 or carbonated water
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
The present invention provides a kind of simulation CO2The system and method handled up to the microcosmic displacement process of cecum oil.The system is used to carry out displacement to the cecum oil in microcosmic core model, including：For clamping the core holding unit of microcosmic core model；For the temperature of microcosmic core model to be adjusted to the temperature-adjusting device of analog temperature；For the pressure of microcosmic core model to be adjusted to the pressure-regulating device of simulated pressure；For making microcosmic core model reach the simulator of simulated formation state；For injecting CO into microcosmic core model2CO2Injection device；For collecting the collection of products device of exploitation product.The present invention also provides a kind of simulation CO2The method handled up to the microcosmic displacement process of cecum oil, by CO2The process of displacement cecum oil of handling up is simulated, analyze it is microcosmic under the conditions of CO2It handles up to oil well cecum oil Flooding Efficiency and interaction mechanism between the two, so that the secondary recovery for cecum oil provides theories integration.
Description
Technical field
The present invention relates to a kind of simulation CO2The system and method handled up to the microcosmic displacement process of cecum oil, more particularly, to
A kind of simulation CO2The microcosmic visualization system and method handled up to high temperature and pressure oil well cecum residual oil displacement process, belong to oil
Gas field development engineering technical field.
Background technique
CO2There is very high solubility, CO in the oil2After being dissolved in crude oil, crude oil volume expansion, viscosity decline can be made, and
And can reduce the interfacial tension and minimum miscibility pressure of two-phase, therefore, by CO2Oil reservoir is injected, can not be increased substantially
Recovery ratio, and can reach CO2It seals the purpose with emission reduction up for safekeeping, meets the double requirements of environmental protection and oil reservoir Efficient Development.Especially
It is in recent years, to utilize CO2The displacement of reservoir oil of handling up becomes one of most important flooding method, is widely applied.So point
Analysis and research CO2Handling up has very actual directive significance for oil reservoir exploitation to the driving mechanism of crude oil.
A kind of horizontal well CO is disclosed in Chinese patent application CN201110393334.62It handles up water-control oil-increasing method,
Using process pipe string by suitable CO2It is injected into the horizontal well of the suitable improper water logging of condition, closing well for a period of time, makes to infuse
The CO entered2Physical-chemical reaction is carried out with fluid in layer, production is controlled after driving a well, oil production obviously rises.This method is only from macro
To CO on seeing2Water-control oil-increasing of handling up is studied, can not be from microcosmic mechanism angle to CO2It handles up and improves high temperature and pressure oil well
Cecum residual oil Flooding Efficiency is evaluated.
A kind of chemical agent auxiliary CO is disclosed in Chinese patent application CN201610541936.42It handles up and improves common heavy oil
The method of oil recovery, this method is by chemical agent and CO2It handles up and combines, carrying out excessive round CO2Handle up, chemical agent with
CO2Synergistic effect under more rounds handle up after, oil well still is able to keep higher oil production.But this method is only from technique
Angle is to CO2It handles up and is studied, concern focuses on using thinner and/or foaming agent as chemical agent to CO2It handles up
Auxiliaring effect, can not be from microcosmic mechanism angle to CO2Handle up improve high temperature and pressure oil well cecum residual oil Flooding Efficiency into
Row evaluation.
During practical oil extraction, after the means such as gas drive, water drive or polymer flooding carry out oil extraction, also
A large amount of crude oil is trapped in rock core as oil residues, wherein having quite a few oil residues to be distributed in the cecum of rock core, such as
What exploits this part cecum residual oil (cecum oil), to further increase oil recovery factor, be current actual production and
The emphasis and difficult point of theoretical research.Therefore, analysis and research CO2It handles up to the driving mechanism of cecum oil to further increase harvesting
Rate has very important significance.But few scholars study CO at present2The displacement machine handled up to oil well cecum residual oil
Reason, also without it is a kind of simulation it is microcosmic under the conditions of CO2System and the side handled up to high temperature and pressure oil well cecum residual oil displacement process
Method.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of simulation CO2It handles up to the microcosmic displacement process system of cecum oil
System and method, by simulate it is microcosmic under the conditions of CO2It handles up the process of displacement cecum residual oil, so as to CO under the conditions of microcosmic2
The effect of displacement cecum residual oil of handling up is evaluated and is analyzed, and is CO2Displacement cecum oil of handling up provides theoretical direction and skill
Art is supported.
The first aspect of the invention provides a kind of simulation CO2The system handled up to the microcosmic displacement process of cecum oil, is used for
Displacement is carried out to the cecum oil in microcosmic core model, including：
For clamping the core holding unit of microcosmic core model；
For the temperature of microcosmic core model to be adjusted to the temperature-adjusting device of analog temperature；
For the pressure of microcosmic core model to be adjusted to the pressure-regulating device of simulated pressure；
For making microcosmic core model reach the simulator of simulated formation state；
For injecting CO into microcosmic core model2CO2Injection device；
For collecting the collection of products device of exploitation product.
It further, further include for acquiring CO2The image collecting device for displacement cecum oil process of handling up.
Specifically, simulator includes the saturation water injecting device for injecting saturated water into microcosmic core model, with
And the crude oil injection device for injecting crude oil into microcosmic core model.
Specifically, microcosmic core model has cecum, fluid inlet and fluid outlet, fluid inlet and fluid outlet difference
It is connected to cecum.
It further, further include the waste collecting device being connected to microcosmic core model.
The second aspect of the invention provides a kind of simulation CO2The method handled up to the microcosmic displacement process of cecum oil, including
Following steps：
1) temperature and pressure of microcosmic core model is adjusted to analog temperature and simulated pressure respectively；
2) saturated water is injected into microcosmic core model, is subsequently injected into crude oil, until reaching simulated formation state；
3) CO is injected into microcosmic core model2；
4) microcosmic core model is closed, stewing well process is simulated；
5) microcosmic core model is opened, CO is simulated2It handles up the process of displacement cecum oil, and collects exploitation product.
Further, the above-mentioned CO of image acquisition device is utilized2It handles up the process of displacement cecum oil.
Specifically, CO2Injection rate be 0.01~0.1mL/min.
Specifically, analog temperature is 20~120 DEG C,
Simulated pressure includes lithostatic pressure and strata pressure, and lithostatic pressure is 0~16MPa；Strata pressure is 0~16MPa.
Specifically, the preparation method of microcosmic core model includes the steps that following sequence carries out：
The first import and first outlet for etching the first groove on the first organic glass and being connected to the first groove；
The second import and second outlet for etching the second groove on the second organic glass and being connected to the second groove, the
Two grooves, the second import and second outlet are matched and are oppositely arranged with the first groove, the first import and first outlet respectively；
First organic glass and the second organic glass are oppositely arranged and are pasted, microcosmic core model is made；
Wherein, the first groove and the second groove constitute the cecum of microcosmic core model, and the first import and the second import are constituted
The fluid inlet of microcosmic core model, first outlet and second outlet constitute the fluid outlet of microcosmic core model.
The present invention provides a kind of simulation CO2The system and method handled up to the microcosmic displacement process of cecum oil, can simulate
And observe CO under the conditions of microcosmic2The displacement process handled up to cecum oil, so as to CO2It handles up the displacement of displacement cecum oil
Effect and driving mechanism are analysed and evaluated, and are practical CO2Displacement cecum oil of handling up provides theoretical direction, to further increase
Oil recovery factor.
Detailed description of the invention
Fig. 1 is a kind of simulation CO provided in the embodiment of the invention2It handles up to cecum oil displacement process system
The structural schematic diagram of system；
Fig. 2 is the structural schematic diagram of the microcosmic core model provided in the embodiment of the invention；
Fig. 3 is the structural schematic diagram of the simulator provided in the embodiment of the invention.
Description of symbols：
The microcosmic core model of 1-；11- cecum；12- fluid inlet；
13- fluid outlet；2- core holding unit；21- ring presses fluid cavity；
3- temperature-adjusting device；31- temperature-controlled box；4- pressure control device；
41- confining pressure adjuster；42- back pressure regulator；43- back-pressure valve；
5- simulator；51- is saturated water injecting device；52- crude oil injection device；
53- saturated water intermediate receptacle；54- crude oil intermediate receptacle； 6-CO2Injection device；
61-CO2Intermediate receptacle；62- drier；63- flowmeter；
7- collection of products device；8- constant-flux pump；9- image collecting device；
91- display device；92- lighting device.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Present invention firstly provides a kind of simulation CO2The system handled up to the microcosmic displacement process of cecum oil, for microcosmic rock
Cecum oil in heart model 1 carries out displacement, as shown in Figure 1, including：
For clamping the core holding unit 2 of microcosmic core model 1；
For the temperature of microcosmic core model 1 to be adjusted to the temperature-adjusting device 3 of analog temperature；
For the pressure of microcosmic core model 1 to be adjusted to the pressure-regulating device 4 of simulated pressure；
For making microcosmic core model 1 reach the simulator 5 of simulated formation state；
For injecting CO into microcosmic core model 12CO2Injection device 6；
For collecting the collection of products device 7 of exploitation product.
Simulation CO provided by the invention2The system handled up to the microcosmic displacement process of cecum oil, will be micro- using core holding unit 2
Core model 1 is seen to be gripped, by the cooperation between temperature-adjusting device 3, pressure-regulating device 4 and simulator 5,
So that microcosmic core model 1 is reached experiment condition, and passes through CO2Injection device 6 injects CO into microcosmic core model 12, utilize production
Object collection device 7 collects exploitation product, so as to simulate CO2The microcosmic displacement process handled up to cecum oil.
The present invention is not specially limited the quantity of microcosmic core model 1, can be 1 or 1 or more, can be according to tool
Body experiment condition is rationally arranged.During the experiment, all microcosmic core models 1 are clamped by core holding unit 2 and solid
It is fixed.
As described above, the present invention provides one kind for evaluating CO2The system handled up to the microcosmic Flooding Efficiency of cecum oil is so-called
Cecum 11, be the common displacement means such as gas drive, water drive or polymer flooding involve less than region, and the size of cecum 11 is micro-
Meter level, generally 1~1000 micron；So-called cecum oil, refers to and have passed through common displacement, still remain in the original in cecum 11
Oil, i.e. cecum residual oil.
Under normal conditions, microcosmic core model 1 has cecum 11, fluid inlet 12 and fluid outlet 13, wherein fluid enters
Mouth 12 and fluid outlet 13 are connected to cecum 11 respectively, as shown in Figure 2.
The present invention is not specially limited the quantity of cecum 11 in each microcosmic core model 1, specifically, each microcosmic
Core model 1 can have a cecum 11, can also be there are two the above cecum 11, can be according to the oil well cecum actual conditions of simulation
Rationally it is arranged with experiment purpose.
The present invention is not specially limited the shape of cecum 11, for example the section of cecum 11 can assume diamond in shape, rectangle, three
Angular or other shapes, it will be understood that the shape of cecum 11 can be reasonable according to the actual conditions of the oil well cecum of simulation with size
Design.In the embodiment of the invention, as shown in Fig. 2, cecum 11 is cylinder.
The present invention is not specially limited the preparation method of microcosmic core model 1, can use the side of this field routine
Formula preparation, for example can acquire after rock core through being further processed to obtain, it can also be made using organic glass.It is specific in the present invention one
In embodiment, the preparation method of microcosmic core model 1 includes the steps that following sequence carries out：
1) the first import and first outlet for etching the first groove on the first organic glass and being connected to the first groove；
2) the second import and second outlet for etching the second groove on the second organic glass and being connected to the second groove,
Second groove, the second import and second outlet are matched and are oppositely arranged with the first groove, the first import and first outlet respectively；
3) the first organic glass and the second organic glass are oppositely arranged and are pasted, microcosmic core model 1 is made；Its
In, the first groove and the second groove constitute the cecum 11 of microcosmic core model 1, and the first import and the second import constitute microcosmic rock core
The fluid inlet 12 of model 1, first outlet and second outlet constitute the fluid outlet 13 of microcosmic core model 1.
The present invention does not do considered critical for the shape of microcosmic core model 1, in specific implementation process of the present invention, preparation
First organic glass used in microcosmic core model 1 and the second organic glass are rectangle, preferably square.Fluid inlet 12 and stream
One end of body outlet 13 is connected to cecum 11, and the other end extends respectively to the diagonal angle of microcosmic core model 1, as shown in Figure 2.
The present invention is not specially limited temperature-adjusting device 3, and the means of this field routine can be used, by microcosmic rock core
The temperature of model 1 is adjusted to analog temperature, for example can choose use heating device matched with core holding unit 2.In this hair
In a bright specific embodiment, referring to FIG. 1, temperature-adjusting device 3 includes heating and thermal insulation set (not shown) and temperature control box 31,
Middle heating and thermal insulation set is disposed around the outside of core holding unit 2, and temperature control box 32 and heating and thermal insulation set connect, by adjusting heating and thermal insulation
The temperature of microcosmic core model 1 is adjusted to analog temperature by the temperature of set.
The present invention is also not specially limited pressure-regulating device 4, and the means of this field routine can be used, by microcosmic rock
The pressure of heart model 1 is adjusted to simulated pressure.It is appreciated that simulated pressure should be with the pressure one of actual formation environment locating for rock core
It causes, simulated pressure generally includes lithostatic pressure and strata pressure.In the embodiment of the invention, referring to FIG. 1, micro-
It sees and forms ring pressure fluid cavity 21 between core model 1 and core holding unit 2, by the way that the confining pressure for pressing fluid cavity 21 to be connected to ring is arranged
Adjuster 41, such as confining pressure adjuster 41 can be constant-flux pump, and confining pressure adjuster 41 presses fluid cavity 21 to microcosmic rock core by ring
Model 1 applies confining pressure, i.e. lithostatic pressure.For strata pressure, reality can be cooperated by back pressure regulator 42 and back-pressure valve 43
The adjusting and control of existing strata pressure.Specifically, back pressure regulator 42 is connected to by pipeline with microcosmic core model 1, back-pressure valve
43 are arranged on pipeline.
Heretofore described simulator 5, effect are that microcosmic core model 1 is made to reach simulated formation state.At this
It invents in a specific embodiment, please refers to Fig. 1 and Fig. 3, simulator 5 includes full for injecting into microcosmic core model 1
With the saturation water injecting device 51 of water, and the crude oil injection device 52 for injecting crude oil into microcosmic core model 1.Specifically
, saturation water injecting device 51 includes saturated water intermediate receptacle 54, is internally provided with piston (not shown), is externally connected to advection
Pump 8, constant-flux pump 8 can push piston mobile, so that the saturated water being contained in saturated water intermediate receptacle 54 be made to be injected into microcosmic rock
In heart model 1, makes to be saturated water inside microcosmic core model 1 and fill up；Crude oil injection device 52 includes crude oil intermediate receptacle 53,
Inside is equipped with piston (not shown), is externally connected to constant-flux pump 8, constant-flux pump 8 can push piston mobile, to make to be contained in crude oil
Crude oil in intermediate receptacle 53 is injected into microcosmic core model 1, until rock core by mother oil displacement to water state is fettered, to reach
To simulated formation state.
It is appreciated that during injecting saturated water and crude oil into microcosmic core model 1, in order to ensure mother oil displacement
To constraint water state, it should inject excessive saturated water and crude oil, just can ensure that microcosmic core model 1 reaches simulated formation shape
State.In the embodiment of the invention, above-mentioned simulation CO2It handles up also further to the system of the microcosmic displacement process of cecum oil
Including the waste collecting device (not shown) being connected to microcosmic core model 1, specifically, waste collecting device and microcosmic rock core mould
The fluid outlet 13 of type 1 is connected to.Excessive saturated water and excessive crude oil are discharged by the fluid outlet 13 of microcosmic core model 1
And collected by waste collecting device.In the embodiment of the invention, waste collecting device by back-pressure valve 43 with it is micro-
Core model 1 is seen to be connected to.
The present invention is for CO2Injection device 6 is not specially limited, as long as can inject into microcosmic core model 1 real
The CO for the amount of testing2Fluid, and control CO2The injection rate of fluid.In the embodiment of the invention, referring to FIG. 1,
CO2Injection device 6 includes CO2Intermediate receptacle 61 is internally provided with piston (not shown), is externally connected to constant-flux pump 8, constant-flux pump 8
Piston can be pushed mobile, to make to be contained in CO2CO in intermediate receptacle 612Fluid is entered by the fluid in microcosmic core model 1
Mouth 12 is injected into cecum 11, and can pass through the speed control CO that constant-flux pump 8 pushes piston2The injection rate of fluid.
It further, can also be in CO2Drier 62 is set between intermediate receptacle 61 and microcosmic core model 1, to realize
To CO2The drying process of fluid.
Further, flowmeter 63 can also be set between drier 62 and microcosmic core model 1, with accurate measurement
CO2The injection rate of fluid.
The present invention is not specially limited the specific structure of collection of products device 7, as long as CO can be collected2Displacement of handling up is blind
Hold the exploitation product of oil.In the embodiment of the invention, the stream of collection of products device 7 and microcosmic core model 1
Body entrance 12 is connected to, as shown in Figure 1.
The present invention is not specially limited the subsequent processing mode for the exploitation product being collected into collection of products device 7,
For example quantitative analysis is carried out after being isolated, to evaluate production efficiency etc..
In the embodiment of the invention, above system is still further comprised for acquiring CO2Displacement cecum oil is micro-
The image collecting device 9 of sight process.By Image Acquisition method to CO2Displacement cecum oil process of handling up is acquired record, convenient
It is subsequent to CO2The effect of displacement cecum oil of handling up is evaluated and is analyzed.
It further, further include the display device 91 being connect with image collecting device 9, by CO2Displacement cecum of handling up is oily
Process intuitively shown.
Further, further include lighting device 92, provide light source for image collecting device 9, it is preferably clear to obtain having
The image effect of degree.
The present invention does not do particular determination for image collecting device 9, as long as can be to CO2It handles up the mistake of displacement cecum oil
Journey is acquired, for example microimaging head can be used.
The present invention finally provides a kind of simulation CO2The method handled up to the microcosmic displacement process of cecum oil, includes the following steps：
1) temperature and pressure of microcosmic core model 1 is adjusted to analog temperature and simulated pressure respectively；
2) saturated water is injected into microcosmic core model 1, is subsequently injected into crude oil, until reaching simulated formation state；
3) CO is injected into microcosmic core model 12；
4) microcosmic core model 1 is closed, stewing well process is simulated；
5) microcosmic core model 1 is opened, CO is simulated2It handles up the process of displacement cecum oil, and collects exploitation product.
The present invention is not specially limited analog temperature, situation can rationally be arranged according to specific experiments, it is generally the case that
Analog temperature is 20~120 DEG C.In the embodiment of the invention, the outside of core holding unit 2 is provided with heating and protects
Temperature set, temperature control box 32 and heating and thermal insulation set connect, by adjusting the temperature of temperature control box 32, to control the temperature of microcosmic core model 1
Degree reaches formation temperature, and such as 80 DEG C or so.
The present invention is not specially limited simulated pressure, situation can rationally be arranged according to specific experiments, it is generally the case that
Simulated pressure includes lithostatic pressure and strata pressure, wherein lithostatic pressure is 0~16MPa；The strata pressure be 0~
16MPa.Ring, which is formed, in the embodiment of the invention, between microcosmic core model 1 and core holding unit 2 presses fluid cavity
21, by the way that the confining pressure adjuster 41 for pressing fluid cavity 21 to be connected to ring is arranged, press fluid cavity 21 to apply to microcosmic core model 1 by ring
Add confining pressure, lithostatic pressure is made to reach 10.5MPa, stablize about 12 hours, makes the pressure remained steady in ring pressure fluid cavity 21；Then
The back pressure regulator 42 being connected to microcosmic core model 1 is opened, and opens back-pressure valve 43, makes the stratum in microcosmic core model 1
Pressure reaches 10MPa.
It, can be to microcosmic rock after the temperature and pressure of microcosmic core model 1 respectively reaches analog temperature and simulated pressure
Saturated water is injected in heart model 1, so that saturated water is entered cecum 11 by the fluid inlet 12 in microcosmic core model 1, and fill
Full cecum 11 and fluid outlet 13, then inject crude oil into microcosmic core model 1, crude oil are made to pass through microcosmic core model 1
Interior fluid inlet 12 enters cecum 11, until rock core by mother oil displacement to water state is fettered, that is, reach simulated formation state.
In the embodiment of the invention, it is first turned on the constant-flux pump 8 connecting with saturated water intermediate receptacle 54, makes it
The piston in saturated water intermediate receptacle 54 is pushed to make microcosmic core model so that saturated water is injected into microcosmic core model 1
Cecum 11 inside 1 is saturated water and fills up, and excessive saturated water will be collected by waste collecting device；Then it opens and original
The constant-flux pump 8 that oily intermediate receptacle 53 connects makes it push the piston in crude oil intermediate receptacle 53, thus by crude oil intermediate receptacle 53
In crude oil be injected into microcosmic core model 1, and control crude oil injection rate, such as 0.05mL/min or so, until rock core
It will be collected to water state, excessive crude oil is fettered by waste collecting device by mother oil displacement.
When microcosmic core model 1 reaches simulated formation state, CO can be injected into microcosmic core model 12Fluid.This hair
It is bright to CO2The injection rate and injection rate of fluid are not specially limited, and condition can be rationally arranged according to specific experiments.In the present invention
In one specific embodiment, opening and CO2The constant-flux pump 8 that intermediate receptacle 61 connects makes it push CO2Work in intermediate receptacle 61
Plug, thus by CO2Fluid is injected into microcosmic core model 1, in the process, CO2Fluid is dried by drier 62, specific
Injection rate can be measured by flowmeter 63, usual CO2The injection rate of fluid can maintain 0.01mL/min~
0.10mL/min, such as 0.02mL/min.
CO2After fluid injects, microcosmic core model 1 is closed, simulates stewing well process.Stewing well process is simulated, purpose exists
In releasing the latent heat being injected into oil reservoir sufficiently, if the stewing well time is too short, the heat of injection does not obtain sufficiently discharging i.e.
Extraction comes, and stewing well overlong time, then will increase heat loss.It is by microcosmic rock core mould in the embodiment of the invention
Type 1 is closed 48 hours, and the stewing well process during practical oil extraction is simulated.
Stewing well process finishes, and opens microcosmic core model 1, and the cecum oil in microcosmic core model 1 is in decompression recovery process
In be plucked out of, and collected by collection of products device 7.Above-mentioned whole process is to simulate CO2It handles up the process of displacement cecum oil.
In above-mentioned simulation CO2Handle up during displacement cecum oil, can by image collecting device 9 to whole process into
Row acquisition and processing, for example microimaging head can be used as image collecting device 9, and by display device 91 to entire displacement
Process is intuitively shown, CO during stewing well is included in2With the interaction situation of cecum oil, cecum under different experimental conditions
The Flooding Efficiency etc. of oil, with Analysis for CO2With the interaction mechanism of cecum oil, and Flooding Efficiency is compared and evaluated, into
And CO can be obtained2Handle up displacement cecum oil mechanism and best displacement process, be CO2Displacement cecum oil of handling up provides theory and refers to
It leads, improves oil extraction efficiency.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that：It still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. a kind of simulation CO2The system handled up to the microcosmic displacement process of cecum oil, for the cecum oil in microcosmic core model into
Row displacement, which is characterized in that including：
For clamping the core holding unit of microcosmic core model；
For the temperature of microcosmic core model to be adjusted to the temperature-adjusting device of analog temperature；
For the pressure of microcosmic core model to be adjusted to the pressure-regulating device of simulated pressure；
For making microcosmic core model reach the simulator of simulated formation state；
For injecting CO into microcosmic core model2CO2Injection device；
For collecting the collection of products device of exploitation product.
2. system according to claim 1, which is characterized in that further include for acquiring CO2It handles up displacement cecum oil process
Image collecting device.
3. system according to claim 1 or 2, which is characterized in that the simulator includes for microcosmic rock core mould
The saturation water injecting device of saturated water is injected in type, and the crude oil for injecting crude oil into microcosmic core model injects dress
It sets.
4. system according to claim 1 or 2, which is characterized in that the microcosmic core model has cecum, fluid inlet
And fluid outlet, the fluid inlet and fluid outlet are connected to the cecum respectively.
5. system according to claim 1 or 2, which is characterized in that further include be connected to the microcosmic core model it is useless
Liquor collecting device.
6. a kind of simulation CO2The method handled up to the microcosmic displacement process of cecum oil, which is characterized in that include the following steps：
1) temperature and pressure of microcosmic core model is adjusted to analog temperature and simulated pressure respectively；
2) saturated water is injected into microcosmic core model, is subsequently injected into crude oil, until reaching simulated formation state；
3) CO is injected into microcosmic core model2；
4) microcosmic core model is closed, stewing well process is simulated；
5) microcosmic core model is opened, CO is simulated2It handles up the process of displacement cecum oil, and collects exploitation product.
7. according to the method described in claim 6, it is characterized in that, utilizing CO described in image acquisition device2Displacement of handling up is blind
Hold the process of oil.
8. method according to claim 6 or 7, which is characterized in that the CO2Injection rate be 0.01~0.1mL/
min。
9. method according to claim 6 or 7, which is characterized in that the analog temperature is 20~120 DEG C,
The simulated pressure includes lithostatic pressure and strata pressure, and the lithostatic pressure is 0~16MPa；The strata pressure is 0
~16MPa.
10. according to the method described in claim 6, it is characterized in that, the preparation method of the microcosmic core model includes as follows
The step of sequence carries out：
The first import and first outlet for etching the first groove on the first organic glass and being connected to first groove；
The second import and second outlet for etching the second groove on the second organic glass and being connected to second groove, institute
The second groove, the second import and second outlet is stated to match with first groove, the first import and first outlet respectively and opposite
Setting；
First organic glass and the second organic glass are oppositely arranged and are pasted, microcosmic core model is made；
Wherein, the first groove and the second groove constitute the cecum of the microcosmic core model, and the first import and the second import are constituted
The fluid inlet of the microcosmic core model, first outlet and second outlet constitute the fluid outlet of the microcosmic core model.
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