CN107013192A - A kind of confining method of gas drive near miscible flooding pressure range - Google Patents
A kind of confining method of gas drive near miscible flooding pressure range Download PDFInfo
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- CN107013192A CN107013192A CN201710413112.3A CN201710413112A CN107013192A CN 107013192 A CN107013192 A CN 107013192A CN 201710413112 A CN201710413112 A CN 201710413112A CN 107013192 A CN107013192 A CN 107013192A
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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
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
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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
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Abstract
The invention discloses a kind of confining method of gas drive near miscible flooding pressure range.The confining method comprises the following steps：In-place oil is prepared, the relation curve between different injection pressure and oil displacement efficiency is obtained using slim-tube test method；Piecewise fitting processing is carried out to the relation curve, immiscible phase section relation curve, nearly mixed phase section relation curve and mixed phase section relation curve is obtained；Nearly mixed phase section relation curve and the nearly miscible pressure that the pressure range corresponding to the intersection point of immiscible phase section relation curve and mixed phase section relation curve is gas drive are interval；Inject the saturation pressure that pressure is higher than the in-place oil.The present invention carries out piecewise fitting processing according to the relation of oil displacement efficiency and injection pressure, by traditional two sections of fitting a straight lines of non-mixed phase and mixed phase, is extended to immiscible phase section, nearly mixed phase section and mixed phase three sections of fitting a straight lines of section.The inventive method has the advantages that result is accurate, repeatability is high, strong operability, is that there is provided a kind of screening technique for the promotion and application of near miscible flooding technology.
Description
Technical field
The present invention relates to a kind of confining method of gas drive near miscible flooding pressure range, belong to petroleum industry oil reservoir development technology
Field.
Background technology
Gas drive improves oil recovery factor Technology Potential greatly, is to improve a kind of of recovery ratio the reservoir waterflooding later stage to substitute skill
A kind of development technique of art or unsuitable waterflooding reservoir.Wherein, the effect of mixed phase drive technology raising oil recovery factor is best,
But part oil reservoir is due to the limitation of the factors such as depositional environment, formation condition (reservoir temperature and pressure), crude oil property, it is impossible to realize
Mixed phase drives.Research is found, gas drive is implemented near minimum miscibility pressure or slightly less than in the subregion of minimum miscibility pressure point
Recovery ratio is improved, compared with mixed phase drives, although slightly being reduced in terms of oil displacement efficiency, is made moderate progress in terms of fluidity control, because
This, overall recovery factor is compared with mixed phase drives, not obvious reduction.Sentenced however, being driven with mixed phase by minimum miscibility pressure
Not different, near miscible flooding is a region between mixed phase drive and non-phase-mixing driving, how to define the region suitable for screening
It is very meaningful that oil reservoir implements near miscible flooding.
The content of the invention
It is an object of the invention to provide a kind of confining method of gas drive near miscible flooding pressure range, the present invention is using existing
Slim-tube test method obtains the relation of different pressures and different oil displacement efficiencies on in-place oil saturation pressure.
The confining method of gas drive near miscible flooding pressure range provided by the present invention, comprises the following steps：
In-place oil is prepared, relation curve between different injection pressure and oil displacement efficiency is obtained using slim-tube test method；It is right
The relation curve carries out piecewise fitting processing, obtains immiscible phase section relation curve, nearly mixed phase section relation curve and mixed phase section and closes
It is curve；
The intersection point of the nearly mixed phase section relation curve and immiscible phase section relation curve and the mixed phase section relation curve
Corresponding pressure range is that the nearly miscible pressure of gas drive is interval；
The injection pressure is higher than the saturation pressure of the in-place oil.
In above-mentioned confining method, using linear relation fitting immiscible phase section relation curve and the mixed phase section relation
Curve；
The linear relation or the non-rectilinear relation fitting nearly mixed phase section relation curve.
In above-mentioned confining method, the immiscible phase section relation curve, the nearly mixed phase section relation curve and the mixed phase
Section relation curve includes at least three point.
In above-mentioned confining method, the oil displacement efficiency corresponding to the immiscible phase section relation curve is less than 80%；
Oil displacement efficiency corresponding to the nearly mixed phase section relation curve is 80%~90%；
Oil displacement efficiency corresponding to the mixed phase section relation curve is higher than 90%.
In above-mentioned confining method, the slim-tube test method can be that physical analogy slim-tube test method or numerical simulation tubule are real
Method is tested, can specifically be carried out according to existing conventional method.
In above-mentioned confining method, the gas that the gas drive is used is for single phase gas or flue gas, natural gas, containing CO2's
The mixed gas of natural gas；
The single phase gas is carbon dioxide, nitrogen, methane, ethane or propane.
The present invention carries out piecewise fitting processing according to the relation of oil displacement efficiency and injection pressure, by traditional non-mixed phase and mixed
Two sections of fitting a straight lines of phase, are extended to immiscible phase section, nearly mixed phase section and mixed phase three sections of fitting a straight lines of section.The inventive method has result
Accurately, repeatability is high, strong operability the advantages of, be that there is provided a kind of screening technique for the promotion and application of near miscible flooding technology.
Brief description of the drawings
Fig. 1 is the relation injected between pressure and oil displacement efficiency obtained using slim-tube test method and intended by being segmented
Close the matched curve of obtained immiscible phase section, nearly mixed phase section and mixed phase section.
Fig. 2 is the relation between injection pressure and the oil displacement efficiency of the simulation acquisition of use tubule and passes through piecewise fitting
The matched curve of obtained immiscible phase section, nearly mixed phase section and mixed phase section.
Embodiment
Experimental method used in following embodiments is conventional method unless otherwise specified.
Material, reagent used etc., unless otherwise specified, are commercially obtained in following embodiments.
In order to differentiate that oil-gas reservoir gas drive improves recovery ratio near miscible flooding feasibility, the embodiment of the present invention is by traditional, generally acknowledged
Slim-tube test method obtain injection pressure and oil displacement efficiency between relation there is provided one kind determine gas near miscible flooding pressure
The interval method of power.
Table 1 is the composition data of certain domestic oil reservoir oil sample and dissolving gas sample, and injection gas is pure CO2Gas.
Specifically include following steps：
(1) according to oil sample and gas sample, in-place oil is prepared, slim-tube test is carried out；
(2) physical simulation experiment method is used, it is ensured that under conditions of injection pressure is higher than the saturation pressure of in-place oil, obtain
Relation curve between difference injection pressure and oil displacement efficiency, and following piecewise fitting processing is carried out to the relation curve：
The point for being less than 80%, 80~90% and more than 90% to oil displacement efficiency respectively carries out fitting a straight line, and ensures every section
Straight line comprises at least 3 points, and three straight lines determine two intersection points, and the corresponding pressure range of two intersection points is the corresponding gas drive of the oil sample
Nearly miscible pressure is interval, as shown in figure 1, accordingly, it is determined that pure CO2Drive nearly miscible pressure interval for 27.06MPa~
30.51MPa。
Existing 6 points of slim-tube test method general test, wherein the three above point of oil displacement efficiency 90% are fitted one directly
Line, is mixed phase section, the three below point of oil displacement efficiency 90% fitting straight line, is immiscible phase section；Unmarked straight line in Fig. 1 is
In traditional slim-tube test method, the matched curve of immiscible phase section.The inventive method is a difference in that encryption with traditional slim-tube test
The point of immiscible phase section, the point for deviateing immiscible phase section linear relation is found in the region critical with mixed phase section, fits one newly
Straightway (i.e. nearly mixed phase section), obtain two intersection points, between to be defined as nearly miscible pressure interval in region.
In order to verify the accuracy of the inventive method, verified using method for numerical simulation, the nearly mixed phase of acquisition is interval
For 25.03~31.74MPa, as shown in Fig. 2 error is 4% or so.
Specific method is：By Eclipse softwares, first by PVTi modules, by intending PVT experiments and gas injection experiment
Close, set up compositional model；Office modules are imported, the slim-tube test simulation of test point is encrypted, nearly miscible pressure area is obtained
Between.Reference can be made to ELCIPSE 300manual.
Slim-tube test method can join SY/T 6573-2016 minimum miscibility pressure (MMP)s experimental determining method-tubule method；
Identical oil sample, gas sample, carry out above-mentioned slim-tube test, can obtain the repeatable experimental result that is close (every in Fig. 1
Individual pressure spot is 3 average values).
Particular embodiments described above, has been carried out further in detail to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail it is bright, should be understood that the foregoing is only the present invention specific embodiment, the protection model being not intended to limit the present invention
Enclose, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc. should be included in the present invention
Protection domain within.
The composition of certain the domestic oil reservoir oil sample of table 1 and dissolving gas sample
Claims (6)
1. a kind of confining method of gas drive near miscible flooding pressure range, comprises the following steps：
In-place oil is prepared, the relation curve between different injection pressure and oil displacement efficiency is obtained using slim-tube test method；To institute
State relation curve and carry out piecewise fitting processing, obtain immiscible phase section relation curve, nearly mixed phase section relation curve and mixed phase section relation
Curve；
The intersection point institute of the nearly mixed phase section relation curve and immiscible phase section relation curve and the mixed phase section relation curve is right
The pressure range answered is that the nearly miscible pressure of gas drive is interval；
The injection pressure is higher than the saturation pressure of the in-place oil.
2. confining method according to claim 1, it is characterised in that：The immiscible phase section relation is fitted using linear relation
Curve and mixed phase section relation curve；
The linear relation or the non-rectilinear relation fitting nearly mixed phase section relation curve.
3. confining method according to claim 1 or 2, it is characterised in that：It is the immiscible phase section relation curve, described near mixed
Phase section relation curve and mixed phase section relation curve include at least three point.
4. the confining method according to any one of claim 1-3, it is characterised in that：The immiscible phase section relation curve institute
Corresponding oil displacement efficiency is less than 80%；
Oil displacement efficiency corresponding to the nearly mixed phase section relation curve is 80%~90%；
Oil displacement efficiency corresponding to the mixed phase section relation curve is higher than 90%.
5. the confining method according to any one of claim 1-4, it is characterised in that：The slim-tube test method is physics mould
Intend slim-tube test method or numerical simulation slim-tube test method.
6. the confining method according to any one of claim 1-5, it is characterised in that：The gas that the gas drive is used is single
Phase gas or flue gas, natural gas, containing CO2Natural gas mixed gas；
The single phase gas is carbon dioxide, nitrogen, methane, ethane or propane.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106837269A (en) * | 2017-03-03 | 2017-06-13 | 中国石油大学(北京) | Low, the extra-low permeability oil reservoirs CO of one kind2Drive nearly miscible pressure area determination method |
| CN107939356A (en) * | 2017-11-28 | 2018-04-20 | 中国石油大学(北京) | A kind of method and system of definite gas injection near miscible flooding pressure range |
| CN109113688A (en) * | 2018-09-10 | 2019-01-01 | 中国海洋石油集团有限公司 | A kind of non-pure CO of determination2The method of near miscible flooding minimum miscibility pressure (MMP) |
| CN109372478A (en) * | 2018-12-21 | 2019-02-22 | 中国石油大学胜利学院 | A kind of experimental method and device of determining immiscible drive-gas displacement oil mining method |
| CN112647905A (en) * | 2019-10-10 | 2021-04-13 | 中国石油化工股份有限公司 | Method for determining components of natural gas flooding injection gas and natural gas flooding method |
| CN114856511A (en) * | 2021-02-03 | 2022-08-05 | 中国石油化工股份有限公司 | Nitrogen gas miscible flooding method |
| CN115935674A (en) * | 2022-12-20 | 2023-04-07 | 中国石油大学(北京) | Based on CO 2 Multiphase band discrimination method for time-space change characteristics of reservoir displacement fluid |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2752637C1 (en) * | 2021-01-26 | 2021-07-29 | Публичное акционерное общество «Татнефть» имени В.Д. Шашина | Method for determining saturation pressure of produced product with gas |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106837269A (en) * | 2017-03-03 | 2017-06-13 | 中国石油大学(北京) | Low, the extra-low permeability oil reservoirs CO of one kind2Drive nearly miscible pressure area determination method |
| CN107939356A (en) * | 2017-11-28 | 2018-04-20 | 中国石油大学(北京) | A kind of method and system of definite gas injection near miscible flooding pressure range |
| CN109113688A (en) * | 2018-09-10 | 2019-01-01 | 中国海洋石油集团有限公司 | A kind of non-pure CO of determination2The method of near miscible flooding minimum miscibility pressure (MMP) |
| CN109113688B (en) * | 2018-09-10 | 2021-03-02 | 中国海洋石油集团有限公司 | Method for determining minimum miscible phase pressure of near miscible phase flooding of non-pure CO2 |
| CN109372478A (en) * | 2018-12-21 | 2019-02-22 | 中国石油大学胜利学院 | A kind of experimental method and device of determining immiscible drive-gas displacement oil mining method |
| CN109372478B (en) * | 2018-12-21 | 2021-02-09 | 中国石油大学胜利学院 | Experimental method and device for determining immiscible gas flooding oil exploitation mode |
| CN112647905A (en) * | 2019-10-10 | 2021-04-13 | 中国石油化工股份有限公司 | Method for determining components of natural gas flooding injection gas and natural gas flooding method |
| CN112647905B (en) * | 2019-10-10 | 2023-12-22 | 中国石油化工股份有限公司 | Method for determining components of natural gas flooding injection gas and natural gas flooding method |
| CN114856511A (en) * | 2021-02-03 | 2022-08-05 | 中国石油化工股份有限公司 | Nitrogen gas miscible flooding method |
| CN115935674A (en) * | 2022-12-20 | 2023-04-07 | 中国石油大学(北京) | Based on CO 2 Multiphase band discrimination method for time-space change characteristics of reservoir displacement fluid |
| CN115935674B (en) * | 2022-12-20 | 2024-03-12 | 中国石油大学(北京) | Based on CO 2 Multiphase zone discrimination method for space-time change characteristics of oil displacement reservoir fluid |
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