CN108868709A - A kind of simulation CO2System and method of the gas drive to the microcosmic displacement process of cecum oil - Google Patents
A kind of simulation CO2System and method of the gas drive to the microcosmic displacement process of cecum oil Download PDFInfo
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- CN108868709A CN108868709A CN201710326880.5A CN201710326880A CN108868709A CN 108868709 A CN108868709 A CN 108868709A CN 201710326880 A CN201710326880 A CN 201710326880A CN 108868709 A CN108868709 A CN 108868709A
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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
- E21B43/164—Injecting CO2 or carbonated water
Abstract
The present invention provides a kind of simulation CO2System and method of the gas drive to the microcosmic displacement process of cecum oil.The system is used to carry out displacement to the cecum oil in core model, including：For clamping the core holding unit of core model；For the temperature of core model to be adjusted to the temperature-adjusting device of analog temperature；For the temperature of core model to be adjusted to the pressure-regulating device of analog temperature；For making core model reach the simulator of simulated formation state；For injecting CO into core model2CO2Injection device.The present invention also provides a kind of simulation CO2Gas drive to the method for the microcosmic displacement process of cecum oil, with analyze it is microcosmic under the conditions of CO2Gas drive is to oil well cecum oil Flooding Efficiency and interaction mechanism between the two.
Description
Technical field
The present invention relates to a kind of simulation CO2Gas drive to the system and method for the microcosmic displacement process of cecum oil, more particularly, to
One kind is for simulating and evaluating CO2Gas drive improve high temperature and pressure oil well cecum residual oil Flooding Efficiency microcosmic visualization system and
Method belongs 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 CO in recent years2The displacement of reservoir oil becomes one of most important flooding method, is widely applied.So analysis and research
CO2Driving mechanism has very actual directive significance for oil reservoir exploitation.
The paper that the Wang Yanyong of Daqing oil field Yushulin Oilfield Development Co., Ltd was delivered in 2015《Grand celebration elm
Woods oil field FY oil-layer CO2Oil displacement test》In, by back-up sand rock core displacement test to crude oil and CO2Parameters variation after effect into
It has gone correlative study, has analyzed CO2The seepage flow characteristics and oil displacement efficiency of gas drive and water drive, test effect confirm CO2Technology of reservoir sweep
It is worthy of popularization.The paper that the Liu Chengjie of middle petrochemical industry Shengli Oil Field branch company was delivered in 2012《CO2Gas drive envelope is altered with modification
The development of gel rubber system and Lab-evaluation》In, it is blocked and is tested by single rock core and parallel core, to a kind of CO2Gas drive envelope alters use
Modified gel envelope is altered agent and is tested.
But at present for CO2The research of gas drive is confined to single rock core or parallel core sandpack column more, and can only
Experimentation and mechanism are derived by the data of production fluid, it can not be from microcosmic angle to CO2With the phase interaction of crude oil
It is studied with mechanism.
During practical oil extraction, after the means such as gas drive or water drive carry out mother oil displacement, there are also a large amount of former
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, how to this portion
Divide cecum oily (cecum residual oil) to be exploited, is the emphasis and difficult point of current actual production and theoretical research.Therefore, analysis with
Study CO2Gas drive further increases recovery ratio to the secondary recovery of crude oil with very important to the driving mechanism of cecum oil
Meaning.But few scholars study CO at present2Gas drive is also used for the driving mechanism of oil well cecum residual oil without one kind
Simulate CO2Microcosmic visualization system and method for the gas drive to oil well cecum residual oil displacement process.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of simulation CO2Gas drive is to the microcosmic displacement process system of cecum oil
System and method, by simulate it is microcosmic under the conditions of CO2Gas drive is conducive to CO under the conditions of microcosmic the displacement process of cecum residual oil2
Gas drive is evaluated and is analyzed to cecum residual oil Flooding Efficiency, to be CO2Displacement cecum oil provides theoretical direction and technology
It supports.
The first aspect of the invention provides a kind of simulation CO2Gas drive is used for the system of the microcosmic displacement process of cecum oil
Displacement is carried out to the cecum oil in core model, including：
For clamping the core holding unit of core model；
For the temperature of core model to be adjusted to the temperature-adjusting device of analog temperature；
For the pressure of core model to be adjusted to the pressure-regulating device of simulated pressure；
For making core model reach the simulator of simulated formation state；
For injecting CO into core model2CO2Injection device.
It further, further include for acquiring CO2The image collecting device of displacement cecum oil process.
Specifically, simulator includes the saturation water injecting device for injecting saturated water into core model, Yi Jiyong
In the crude oil injection device for injecting crude oil into core model.
Specifically, core model has cecum, fluid inlet and a fluid outlet, fluid inlet and fluid outlet respectively with it is blind
End connection.
It further, further include the liquid trap being connected to core model.
The second aspect of the invention provides a kind of simulation CO2Gas drive to the method for the microcosmic displacement process of cecum oil, including
Following steps：
1) temperature and pressure of core model is adjusted to analog temperature and simulated pressure respectively；
2) saturated water is injected into core model, is subsequently injected into crude oil, until reaching simulated formation state；
3) CO is injected into core model2, simulate CO2The process of displacement cecum oil.
It further, further include utilizing the above-mentioned CO of image acquisition device2The process of displacement cecum oil.
Specifically, CO2Injection rate be 0.01~0.10mL/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 be 0~
16MPa。
Specifically, the preparation method of 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, core model is made；Wherein, first is recessed
The cecum of slot and the second groove composition core model, the fluid inlet of the first import and the second import composition core model, first
Outlet and second outlet constitute the fluid outlet of core model.
The present invention provides a kind of simulation CO2Gas drive is to the system and method for cecum oil displacement process, by simulating and seeing
Examine it is microcosmic under the conditions of CO2Gas drive can be evaluated and be analyzed to Flooding Efficiency, and then can be obtained to the displacement process of cecum oil
Obtain CO2The mechanism of displacement cecum oil is practical CO2Displacement cecum oil provides theoretical direction.
Detailed description of the invention
Fig. 1 is a kind of simulation CO provided in the embodiment of the invention2Gas drive is to cecum oil displacement process system
The structural schematic diagram of system；
Fig. 2 is the structural schematic diagram of the 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：
1- core model；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- constant-flux pump；8- image collecting device；81- display device；
82- lighting device；9- liquid trap.
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 one kind for evaluating CO2Gas drive is used for rock the system of the microcosmic Flooding Efficiency of cecum oil
Cecum oil in heart model 1 carries out displacement, as shown in Figure 1, including：
For clamping the core holding unit 2 of core model 1；
For the temperature of core model 1 to be adjusted to the temperature-adjusting device 3 of analog temperature；
For the pressure of core model 1 to be adjusted to the pressure-regulating device 4 of analog temperature；
For making core model 1 reach the simulator 5 of simulated formation state；
For injecting CO into core model2CO2Injection device 6.
The present invention is gripped core model 1 by core holding unit 2, passes through temperature-adjusting device 3, pressure tune
Cooperation between regulating device 4 and simulator 5 makes core model 1 reach experiment condition, and passes through CO2Injection device 6 is to rock core
CO is injected in model 12, so as to simulate CO2Microcosmic displacement process of the gas drive to cecum oil.
The present invention is not specially limited the quantity of core model 1, can be 1 or more, can be according to specific experiments
Condition is rationally arranged.In the specific implementation process, all core models 1 are clamped by core holding unit 2 and fixed.
Under normal conditions, core model 1 has cecum 11, fluid inlet 12 and fluid outlet 13, wherein fluid inlet 12
It is connected to respectively with cecum 11 with fluid outlet 13, as shown in Figure 2.
As described above, the present invention provides one kind for evaluating CO2Gas drive is so-called to the system of the microcosmic Flooding Efficiency of cecum oil
Cecum 11, be common displacement means involve less than region, and the size of cecum 11 be micron order, generally 1~1000 is micro-
The size of rice；So-called cecum oil, refers to and have passed through common displacement, still remain in the crude oil in cecum 11.
The present invention is not specially limited the quantity of cecum 11 in each core model 1, specifically, each core model
1 can have a cecum 11, can also there are two the above closed cecum 11, can according to the oil well cecum actual conditions of simulation and
Experiment purpose is rationally arranged.As shown in Fig. 2, core model 1 has 3 cecums 11 in the embodiment.
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, the section of cecum 11 is diamond shape, i.e. the section of cecum 11 is 2 and is oppositely arranged
Triangle be oppositely arranged, as shown in Figure 2.
The present invention is not specially limited the preparation method of core model 1, can in such a way that this field is conventional system
It is standby, for example can acquire after rock core through being further processed to obtain, it can also be made using organic glass.It is embodied in the present invention one
In mode, the preparation method of 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,
Wherein the shape of the first groove can be triangle, rectangle or other shapes；
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, core model 1 is made；Wherein,
One groove and the second groove constitute the cecum 11 of core model 1, and the fluid that the first import and the second import constitute core model 1 enters
Mouth 12, first outlet and second outlet constitute the fluid outlet 13 of core model 1.
The present invention is not specially limited temperature-adjusting device 3, and the means of this field routine can be used, by core model
1 temperature is adjusted to analog temperature, for example can choose use heating device matched with core holding unit 2.In the present invention one
In specific embodiment, referring to FIG. 1, temperature-adjusting device 3 includes heating and thermal insulation set (not shown) and temperature control box 31, wherein
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 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 rock core mould
The pressure of type 1 is adjusted to simulated pressure.It is appreciated that the pressure of core model 1 should simulate ground environment locating for practical rock core
Pressure, it is generally the case that simulated pressure includes lithostatic pressure and strata pressure.In the embodiment of the invention, ask
With reference to Fig. 1, ring is formed between core model 1 and core holding unit 2 and presses fluid cavity 21, press fluid cavity 21 to connect by setting and ring
Logical confining pressure adjuster 41, for example constant-flux pump may be selected, confining pressure adjuster 41 presses fluid cavity 21 to apply to core model 1 by ring
Add confining pressure, i.e. lithostatic pressure.For strata pressure, stratum can be realized by back pressure regulator 42 and the cooperation of back-pressure valve 43
The adjusting and control of pressure.Specifically, back pressure regulator 42 is connected to by pipeline with core model 1, back-pressure valve 43 is arranged in pipe
On road.
Heretofore described simulator 5, effect are that core model 1 is made to reach simulated formation state.In the present invention
In one specific embodiment, Fig. 1 and Fig. 3 are please referred to, simulator 5 includes for injecting the full of saturated water into core model 1
With water injecting device 51, and the crude oil injection device 52 for injecting crude oil into core model 1.Specifically, saturated water is infused
Entering device 51 includes saturated water intermediate receptacle 54, is internally provided with piston (not shown), is externally connected to constant-flux pump 7, constant-flux pump
7 can push piston mobile, so that the saturated water being contained in saturated water intermediate receptacle 54 be made to be injected into core model 1, make rock
Water is saturated inside heart model 1 to fill up；Crude oil injection device 52 includes crude oil intermediate receptacle 53, is internally provided with piston and (does not scheme
Show), it is externally connected to constant-flux pump 7, constant-flux pump 7 can push piston mobile, to make the original being contained in crude oil intermediate receptacle 53
Oil is injected into core model 1, until rock core by mother oil displacement to water state is fettered, to reach simulated formation state.
It is appreciated that during injecting saturated water and crude oil into core model 1, in order to ensure mother oil displacement to beam
Tie up water state, it should inject excessive saturated water and crude oil, just can ensure that core model 1 reaches simulated formation state.In this hair
In a bright specific embodiment, above-mentioned simulation CO2Gas drive is still further comprised to the system of the microcosmic displacement process of cecum oil and rock
The liquid trap 9 that heart model 1 is connected to, specifically, liquid trap 9 is actually to be connected to the fluid outlet 13 of core model 1.It is excessive
Saturated water and excessive crude oil are discharged by the fluid outlet 13 of core model 1 and are collected by liquid trap 9.
The present invention is for CO2The structure of injection device 6 is not specially limited, as long as can inject into core model 1
The CO of experimental amount2Fluid, and accurately control CO2The injection rate of fluid.In the embodiment of the invention, it please join
Examine Fig. 1, CO2Injection device 6 includes CO2Intermediate receptacle 61 is internally provided with piston (not shown), is externally connected to constant-flux pump 7,
Constant-flux pump 7 can push piston mobile, to make to be stored in CO2CO in intermediate receptacle 612Fluid passes through the stream in core model 1
Body entrance 12 is injected into cecum 11, and the speed control CO of piston can be pushed by constant-flux pump 72The injection rate of fluid.
It further, can also be in CO2Drier 62 is set between intermediate receptacle 61 and core model 1, to realize to CO2
The drying process of fluid.
Further, flowmeter 63 can also be set between drier 62 and core model 1, with accurate measurement CO2Stream
The injection rate of body.
In the embodiment of the invention, above system is still further comprised for acquiring CO2Displacement cecum oil mistake
The image collecting device 8 of journey.By Image Acquisition method to CO2The process of displacement cecum oil is acquired record, and it is subsequent right to facilitate
CO2The effect of displacement cecum oil is evaluated and is analyzed.
It further, further include the display device 81 being connect with image collecting device 8, by CO2The mistake of displacement cecum oil
Cheng Jinhang is intuitively shown.
Further, further include lighting device 82, provide light source for image collecting device 8, it is preferably clear to obtain having
The image effect of degree.
The present invention does not do particular determination for image collecting device 8, as long as can be to CO2The process of displacement cecum oil into
Row acquisition, for example microimaging head can be used.
The present invention finally provides a kind of evaluation CO2Gas drive includes the following steps the method for the microcosmic Flooding Efficiency of cecum oil：
1) temperature and pressure of core model 1 is adjusted to analog temperature and simulated pressure respectively；
2) saturated water is injected into core model 1, is subsequently injected into crude oil, until reaching simulated formation state；
3) CO is injected into core model 12, simulate CO2The process of displacement cecum oil.
The present invention is not specially limited analog temperature, can the formation temperature according to locating for specific rock core be rationally arranged, mould
Quasi- temperature is 20~120 DEG C.In the embodiment of the invention, the outside of core holding unit 2 is provided with heating and thermal insulation
Set, temperature control box 32 and heating and thermal insulation set connect, and by adjusting the temperature of temperature control box 32, are reached with controlling the temperature of core model 1
Analog temperature, such as 80 DEG C or so.
The present invention is not specially limited simulated pressure, can the ground environment according to locating for specific rock core be rationally arranged, lead to
In normal situation, simulated pressure includes lithostatic pressure and strata pressure, wherein lithostatic pressure is 0~16MPa；The strata pressure
For 0~16MPa.Ring, which is formed, in the embodiment of the invention, between 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 core model 1 by ring
Confining pressure makes lithostatic pressure reach 10.5MPa, stablizes about 12 hours, makes the pressure remained steady in ring pressure fluid cavity 21；Then it opens
The back pressure regulator 42 being connected to core model 1 is opened, and opens back-pressure valve 43, reaches the strata pressure in core model 1
10MPa。
It, can be into core model 1 after the temperature and pressure of core model 1 respectively reaches analog temperature and simulated pressure
Saturated water is injected, saturated water is made to enter cecum 11 by the fluid inlet 12 in core model 1, and fills full cecum 11, then
Crude oil is injected into core model 1, crude oil is made to enter cecum 11 by the fluid inlet 12 in core model 1, until rock core quilt
Mother oil displacement reaches simulated formation state to water state is fettered.
In the embodiment of the invention, it is first turned on the constant-flux pump 7 connecting with saturated water intermediate receptacle 54, makes it
The piston in saturated water intermediate receptacle 54 is pushed to make the cecum of core model 1 so that saturated water is injected into core model 1
11, which are saturated water, fills up, and excessive saturated water will be collected by liquid trap 9；Then it opens and connects with crude oil intermediate receptacle 53
The constant-flux pump 7 connect makes it push the piston in crude oil intermediate receptacle 53, so that the crude oil in crude oil intermediate receptacle 53 is injected into
In core model 1, and control crude oil injection rate, such as 0.05mL/min or so, until rock core is by mother oil displacement to irreducible water
State, excessive crude oil will be collected by liquid trap 9.
The present invention is not specially limited saturated water used in the above method, in the embodiment of the invention
In, selected saturated water is water flooding.
When core model 1 reaches simulated formation state, CO can be injected into core model 12Fluid simulates CO2Displacement is blind
Hold the process of oil.The present invention is to CO2The injection rate of fluid is not specially limited, and condition can be rationally arranged according to specific experiments,
And by adjusting CO2The parameters such as the injection rate and injection rate of fluid observe simultaneously comparative analysis difference CO2Fluid injection rate and note
Enter rate to the Flooding Efficiency of cecum oil, to obtain the process conditions of best coefficient of mining.In the embodiment of the invention
In, opening and CO2The constant-flux pump 7 that intermediate receptacle 61 connects makes it push CO2Piston in intermediate receptacle 61, thus by CO2Stream
Body is injected into core model 1, in the process, CO2Fluid is dried by drier 62, and specific injection rate can pass through stream
Meter 63 is measured, usual CO2The injection rate of fluid can maintain 0.01mL/min~0.10mL/min.
In simulation CO2It, can also be further by image collecting device 8 to entire displacement during displacement cecum oil
Journey is acquired, since the size of cecum 11 is micron order, so can be to CO under the conditions of microcosmic2Displacement of the gas drive to cecum oil
Process is acquired, and can intuitively be shown by display device 81 to the above process.So as to Flooding Efficiency into
Row evaluation analysis, and then CO can be obtained2The mechanism of displacement cecum oil is CO2Displacement cecum oil provides theoretical direction.
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 CO2Gas drive is to the system of the microcosmic displacement process of cecum oil, for driving to the cecum oil in core model
It replaces, which is characterized in that including：
For clamping the core holding unit of core model；
For the temperature of core model to be adjusted to the temperature-adjusting device of analog temperature；
For the pressure of core model to be adjusted to the pressure-regulating device of simulated pressure；
For making core model reach the simulator of simulated formation state；
For injecting CO into core model2CO2Injection device.
2. system according to claim 1, which is characterized in that further include for acquiring CO2The image of displacement cecum oil process
Acquisition device.
3. system according to claim 1 or 2, which is characterized in that the simulator includes for into core model
Inject the saturation water injecting device of saturated water, and the crude oil injection device for injecting crude oil into core model.
4. system according to claim 1 or 2, which is characterized in that the core model has cecum, fluid inlet and stream
Body 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 the liquid trap being connected to the core model.
6. a kind of simulation CO2Method of the gas drive to the microcosmic displacement process of cecum oil, which is characterized in that include the following steps：
1) temperature and pressure of core model is adjusted to analog temperature and simulated pressure respectively；
2) saturated water is injected into core model, is subsequently injected into crude oil, until reaching simulated formation state；
3) CO is injected into core model2, simulate CO2The process of displacement cecum oil.
7. according to the method described in claim 6, it is characterized in that, further including utilizing CO described in image acquisition device2Displacement
The process of cecum 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 core model includes following sequence
Progress the step of：
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, core model is made；Wherein, the first groove and
Second groove constitutes the cecum of core model, and the first import and the second import constitute the fluid inlet of core model, first outlet
The fluid outlet of core model is constituted with second outlet.
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