CN108952648A - Ordos Basin carbon dioxide and in-place oil minimum miscibility pressure calculation method - Google Patents
Ordos Basin carbon dioxide and in-place oil minimum miscibility pressure calculation method Download PDFInfo
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- CN108952648A CN108952648A CN201811001737.XA CN201811001737A CN108952648A CN 108952648 A CN108952648 A CN 108952648A CN 201811001737 A CN201811001737 A CN 201811001737A CN 108952648 A CN108952648 A CN 108952648A
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- minimum miscibility
- miscibility pressure
- oil
- place oil
- ordos basin
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Classifications
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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
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
Abstract
The invention belongs to technical field of petroleum extraction, quantitative calculating Ordos Basin CO is related to how2Minimum miscibility pressure between in-place oil.Ordos Basin carbon dioxide and in-place oil minimum miscibility pressure calculation method, it is characterised in that: Ordos Basin in-place oil is sampled, its fluid composition is analyzed by gas chromatography, obtains the molar fraction X of its volatile componentvol, the molar fraction X of intermediate hydrocarbon componentintAnd the average molecular weight M of heavy componentC7 +, CO can be sought by substituting into following formula2With the minimum miscibility pressure P of in-place oilmm.Ordos Basin CO is calculated using this method2Minimum miscibility pressure between in-place oil is simple and convenient, efficient quick, can quickly carry out CO for oil field2Displacement of reservoir oil Potential Evaluation and block screening provide strong foundation.
Description
Technical field
The invention belongs to technical field of petroleum extraction, quantitative calculating Ordos Basin CO is related to how2With in-place oil
Between minimum miscibility pressure.
Background technique
Compared with conventional water drive, CO2It drives to have improve oil and water mobility ratio, dissolution expansion, reduce oil water interfacial tension etc. and make
With, at home and abroad field test has successfully been carried out in part oil field, and be generally considered a future have be widely applied before
The technology of reservoir sweep of scape.CO2Mixed phase drive and non-phase-mixing driving can be divided into according to its mechanism of oil displacement by driving, and the oil displacement efficiency that mixed phase drives is general
Much higher than non-phase-mixing driving, and determining that can it reach the key parameter of mixed phase drive is CO2With the minimum miscibility pressure of crude oil.Mesh
Before, to CO2Slim-tube test method is generallyd use with the determination method of crude oil minimum miscibility pressure, since it can simulate CO2With crude oil
Multiple-contact in the earth formation, measurement result are generally considered the most accurate.However, this method is since experimental period is long, and
Experimentation is also extremely complex, obtains CO by this method2Minimum miscibility pressure value between crude oil is usually time-consuming and laborious.
It is suitble to carry out CO in view of Ordos Basin2The oil field of the displacement of reservoir oil is numerous, and the reserves of its control are huge, therefore, build
Vertical CO rapidly and efficiently2With crude oil minimum miscibility pressure calculation method to Analysis for CO2Ordos Basin displacement of reservoir oil type and comment
The displacement of reservoir oil potentiality for estimating it in Ordos Basin are very necessary.
Summary of the invention
The present invention is directed to can be in view of the above-mentioned problems, propose a kind of simple and convenient, efficient quick for Ordos Basin
Quickly carry out CO in oil field2Displacement of reservoir oil Potential Evaluation and block screening provide the CO of strong foundation2With crude oil minimum miscibility pressure calculating side
Method.
Technical program of the present invention lies in:
Ordos Basin carbon dioxide and in-place oil minimum miscibility pressure calculation method, it is characterised in that: to Erdos
Basin in-place oil is sampled, by gas chromatography analyze its fluid composition, obtain its volatile component mole point
Number Xvol, the molar fraction X of intermediate hydrocarbon componentintAnd the average molecular weight M of heavy componentC7 +, substituting into following formula can seek
CO2With the minimum miscibility pressure P of in-place oilmm；
Wherein, volatile component includes CH4、N2、CO2、H2S, intermediate hydrocarbon component C2H6-C6H14, i.e. C2-C6Alkane, heavy group
Dividing includes C7H16-C120H242, i.e. C7-C120Alkane.
The technical effects of the invention are that:
The present invention chooses the ground of 9 mouthfuls of wells of Ordos Basin based on single-factor regressioning analysis method and multivariate linear equation method
Layer crude oil, the relation curve of minimum miscibility pressure and each factor is first determined by single-factor regressioning analysis method, is recycled polynary time
Calculating method is returned to calculate the relational expression of three factors and minimum miscibility pressure.Ordos Basin CO is calculated using this method2With ground
Between layer crude oil minimum miscibility pressure is simple and convenient, efficient quick, can quickly carry out CO for oil field2Displacement of reservoir oil Potential Evaluation and block
Screening provides strong foundation.
Detailed description of the invention
Fig. 1 is the molar fraction relational graph of minimum miscibility pressure and volatile component.
Fig. 2 is minimum miscibility pressure and intermediate hydrocarbon component molar fraction relational graph.
Fig. 3 is the average molecular weight relational graph of minimum miscibility pressure and heavy component.
Fig. 4 is the minimum miscibility pressure value comparison diagram measured by slim-tube test and method proposed by the present invention.
Specific embodiment
With multiple block in-place oil physical property and its in-place oil and CO2Minimum miscibility pressure slim-tube test result is base
Plinth, successively to in-place oil volatile component molar fraction Xvol, intermediate hydrocarbon component molar fraction XintAnd the average mark of heavy component
Son amount MC7 +Three functions between factor and minimum miscibility pressure are determined using single-factor regressioning analysis method between minimum miscibility pressure
Relationship.
Fig. 1 to Fig. 3 is respectively molar fraction, minimum miscibility pressure and the intermediate hydrocarbons group of minimum miscibility pressure and volatile component
Point and minimum miscibility pressure and heavy component average molecular weight relationship, as seen from the figure, the letter of minimum miscibility pressure and three
Number relationship is successively are as follows:
Pmm=7.8867e0.0416xvol
Pmm=-0.7087xint+36.254
Multiple regression equation is calculated using multiple regression analysis method, is obtained:
Simplification can obtain:
Wherein, wherein a0=b0+36.254b2-55.849b3, a1=7.8867b1, a2=-0.7087b2, a3=13.675b3；It is logical
Coefficient a can be respectively obtained by crossing recurrence calculating0、a1、a2、a3, value is respectively as follows: -529.57, -8.4669,3.3047,88.9987.
Therefore,
Embodiment 1
Respectively to four different zones stratum of Ordos Basin, a well (A well, B well, C well and D are successively chosen in each region
Well), CO is tested by slim-tube test and method provided by the invention respectively2With the minimum miscibility pressure value of in-place oil；
(1) by the minimum miscibility pressure value that slim-tube test measures A well, B well, C well and D well be respectively 22.15MPa,
17.80MPa, 14.28MPa and 18.52MPa；
(2) the method test CO provided through the invention2With the minimum miscibility pressure value of in-place oil, first to the stratum of the well
Crude oil is sampled, and is carried out PVT using sampling crude oil and is tested, and experiment test obtains the molar fraction of the volatile component of four mouthfuls of wells
Xvol, intermediate hydrocarbon component molar fraction XintWith the average molecular weight M of heavy componentC7 +It is shown in Table 1 and table 2, wherein CXIndicate C member
Plain number is the alkane of X；
Wherein, volatile component includes CH4、N2、CO2、H2S, intermediate hydrocarbon component C2H6-C6H14, i.e. C2-C6Alkane, heavy group
Dividing includes C7H16-C120H242, i.e. C7-C120Alkane.
The in-place oil physical property of 1 four mouthfuls of wells of table
The in-place oil physical property detail parameters of 2 four mouthfuls of wells of table
Bring the parameter in table 1 into following formula respectively
In summary, P is obtainedmm(A)=22.41MPa, Pmm(B)=18.17MPa, Pmm(C)=14.69MPa, Pmm(D)=
18.86MPa。
The CO it is found that four regions is compared with the minimum miscibility pressure value that slim-tube test obtains2Most with in-place oil
It is respectively 1.17%, 2.07%, 2.87% and 1.84% that small miscible pressure, which calculates relative error,.It is calculated using methods herein
To four region CO2It is no more than 5% with the relative error of in-place oil minimum miscibility pressure, illustrates to calculate E Er in this way
More this basin CO2It is more accurate with the minimum miscibility pressure of in-place oil.Table 3 is that slim-tube test and method proposed by the present invention are surveyed
The minimum miscibility pressure value numerical value comparison sheet obtained.Fig. 4 is to be mixed by the minimum that slim-tube test and method proposed by the present invention measure
Phase pressure value comparison diagram.
Compared with 3 calculated value of table measures minimum miscibility pressure with slim-tube test
Claims (1)
1. Ordos Basin carbon dioxide and in-place oil minimum miscibility pressure calculation method, it is characterised in that: to E Erduo
This basin in-place oil is sampled, and is analyzed its fluid composition by gas chromatography, is obtained mole of its volatile component
Score Xvol, the molar fraction X of intermediate hydrocarbon componentintAnd the average molecular weight M of heavy componentC7 +, substituting into following formula can seek
CO2With the minimum miscibility pressure P of in-place oilmm；
Wherein, volatile component includes CH4、N2、CO2、H2S, intermediate hydrocarbon component C2H6-C6H14, heavy component includes C7H16-
C120H242。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811001737.XA CN108952648B (en) | 2018-08-30 | 2018-08-30 | Minimum miscible pressure calculation method for carbon dioxide and formation crude oil in Ordos basin |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811001737.XA CN108952648B (en) | 2018-08-30 | 2018-08-30 | Minimum miscible pressure calculation method for carbon dioxide and formation crude oil in Ordos basin |
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| Publication Number | Publication Date |
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| CN108952648A true CN108952648A (en) | 2018-12-07 |
| CN108952648B CN108952648B (en) | 2020-11-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111861026A (en) * | 2020-07-28 | 2020-10-30 | 中国石油化工股份有限公司 | Method for rapidly acquiring minimum miscible phase pressure of Subei continental phase oil field |
| CN113075750A (en) * | 2020-01-03 | 2021-07-06 | 中国石油天然气股份有限公司 | Method for determining minimum miscible pressure of carbon dioxide and formation crude oil |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798499B (en) * | 2012-08-15 | 2014-11-26 | 中国石油天然气股份有限公司 | Multi-tube type minimum mixed-phase pressure measuring method and device |
| CN104462753B (en) * | 2014-10-31 | 2018-09-18 | 中国石油化工股份有限公司 | A kind of CO2Drive the prediction technique of minimum miscibility pressure |
| CN105181222B (en) * | 2015-10-12 | 2016-12-14 | 东北石油大学 | A kind of multimode measures the device of carbon dioxide minimum miscibility pressure |
| CN105401926B (en) * | 2015-11-24 | 2017-11-10 | 中国石油天然气股份有限公司 | A kind of Forecasting Methodology and device of carbon dioxide flooding oil reservoir miscible pressure |
| CN106840790B (en) * | 2016-12-23 | 2019-10-29 | 东北石油大学 | CO is tested based on long tubule consolidated model2The method and system of crude oil MMP |
| CN108266165A (en) * | 2018-01-15 | 2018-07-10 | 中国石油化工股份有限公司 | LOW PERMEABILITY RESERVOIR CO2Drive minimum miscibility pressure computational methods |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113075750A (en) * | 2020-01-03 | 2021-07-06 | 中国石油天然气股份有限公司 | Method for determining minimum miscible pressure of carbon dioxide and formation crude oil |
| CN113075750B (en) * | 2020-01-03 | 2023-07-25 | 中国石油天然气股份有限公司 | Method for determining minimum miscible pressure of carbon dioxide and crude oil in stratum |
| CN111861026A (en) * | 2020-07-28 | 2020-10-30 | 中国石油化工股份有限公司 | Method for rapidly acquiring minimum miscible phase pressure of Subei continental phase oil field |
| CN111861026B (en) * | 2020-07-28 | 2022-06-07 | 中国石油化工股份有限公司 | Method for rapidly acquiring minimum miscible phase pressure of Subei continental phase oil field |
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