CN108952648B - Minimum miscible pressure calculation method for carbon dioxide and formation crude oil in Ordos basin - Google Patents
Minimum miscible pressure calculation method for carbon dioxide and formation crude oil in Ordos basin Download PDFInfo
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- CN108952648B CN108952648B CN201811001737.XA CN201811001737A CN108952648B CN 108952648 B CN108952648 B CN 108952648B CN 201811001737 A CN201811001737 A CN 201811001737A CN 108952648 B CN108952648 B CN 108952648B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
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- 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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- E21B47/06—Measuring temperature or pressure
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Abstract
The invention belongs to the technical field of oil exploitation, and relates to how to quantitatively calculate the CO of an Ordos basin2Minimum miscible pressure with the formation crude oil. The minimum miscible pressure calculation method of Ordos basin carbon dioxide and formation crude oil is characterized by comprising the following steps of: sampling crude oil in Ordos basin, analyzing fluid composition by gas chromatography to obtain molar fraction X of volatile componentsvolMolar fraction X of the intermediate hydrocarbon componentintAnd the average molecular weight M of the heavy componentC7 +Substituting into the following formula to obtain CO2Minimum miscible pressure P with formation crude oilmm. The method is adopted to calculate the CO of the Ordos basin2The minimum miscible pressure between the oil and the formation crude oil is simple, convenient, efficient and quick, and can quickly develop CO for the oil field2And the evaluation of the oil displacement potential and the block screening provide a powerful basis.
Description
Technical Field
The invention belongs to the technical field of oil exploitation, and relates to how to quantitatively calculate the CO of an Ordos basin2Minimum miscible pressure with the formation crude oil.
Background
CO compared to conventional water flooding2The flooding has the effects of improving the oil-water fluidity ratio, dissolving and expanding, reducing the oil-water interfacial tension and the like, mine field tests are successfully carried out in partial oil fields at home and abroad, and the flooding is generally considered to be a flooding technology with wide application prospect in the future. CO 22The flooding can be divided into miscible flooding and immiscible flooding according to the flooding mechanism, the flooding effect of miscible flooding is generally much higher than that of immiscible flooding, and the key parameter for determining whether miscible flooding can be achieved is CO2Minimum miscible pressure with crude oil. At present, to CO2The method for determining the minimum miscible pressure with crude oil usually adopts a tubule experiment method because the method can simulate CO2With multiple contacts of crude oil in the formation, the measurement is generally considered to be most accurate. However, since the experimental period is long and the experimental process is very complicated, CO is obtained by this method2The minimum miscible pressure value with crude oil is generally time consuming and laborious.
Suitable for developing CO in view of the Ordos basin2The oil fields to be driven are numerous and the reserves to be controlled are huge, so that fast and efficient CO is established2Analysis of CO with minimum miscible pressure calculation method of crude oil2The type of flooding in the deldos basin and the evaluation of its potential for flooding in the deldos basin are essential.
Disclosure of Invention
Aiming at the problems, the invention provides a simple, convenient, efficient and quick method for Ordos basins and capable of quickly developing CO for oil fields2CO providing powerful basis for oil displacement potential evaluation and block screening2A method for calculating the minimum miscible pressure with crude oil.
The technical scheme of the invention is as follows:
the minimum miscible pressure calculation method of Ordos basin carbon dioxide and formation crude oil is characterized by comprising the following steps of: sampling crude oil in Ordos basin, analyzing fluid composition by gas chromatography to obtain molar fraction X of volatile componentsvolMolar fraction X of the intermediate hydrocarbon componentintAnd the average molecular weight M of the heavy componentC7 +Substituting into the following formula to obtain CO2Minimum miscible pressure P with formation crude oilmm；
Wherein the volatile component comprises CH4、N2、CO2、H2S, the middle hydrocarbon component being C2H6-C6H14I.e. C2-C6Heavy components including C7H16-C120H242I.e. C7-C120Of (a) an alkane.
The invention has the technical effects that:
the method is based on a single-factor regression analysis method and a multiple regression calculation method, selects the stratum crude oil of 9 wells of the Ordos basin, determines a relation curve between the minimum miscible pressure and each factor through the single-factor regression analysis method, and calculates a relation between the three factors and the minimum miscible pressure by using the multiple regression calculation method. The method is adopted to calculate the CO of the Ordos basin2The minimum miscible pressure between the oil and the formation crude oil is simple, convenient, efficient and quick, and can quickly develop CO for the oil field2And the evaluation of the oil displacement potential and the block screening provide a powerful basis.
Drawings
FIG. 1 is a graph of minimum miscible pressure versus mole fraction of volatile components.
FIG. 2 is a plot of minimum miscible pressure versus mole fraction of intermediate hydrocarbon components.
FIG. 3 is a graph of minimum miscible pressure versus average molecular weight for heavy components.
Fig. 4 is a graph comparing the minimum miscible pressure values measured by a tubule experiment and the method proposed by the present invention.
Detailed Description
Physical properties of formation crude oil in a plurality of blocks, formation crude oil and CO thereof2On the basis of the minimum miscible phase pressure tubule experiment result, the mole fraction X of the volatile components of the crude oil in the formation is orderly treatedvolIntermediate hydrocarbon component mole fraction XintAnd the average molecular weight M of the heavy componentC7 +And determining the functional relation between the three factors and the minimum miscible pressure by adopting a single-factor regression analysis method.
Fig. 1 to fig. 3 are the relations between the minimum miscible pressure and the mole fraction of the volatile component, the minimum miscible pressure and the intermediate hydrocarbon component, and the minimum miscible pressure and the average molecular weight of the heavy component, respectively, and it can be seen from the graphs that the functional relations between the minimum miscible pressure and the three are sequentially:
Pmm＝7.8867e0.0416xvol
Pmm＝-0.7087xint+36.254
calculating a multiple regression equation by adopting a multiple regression analysis method to obtain:
the simplification can be obtained:
wherein a is0＝b0+36.254b2-55.849b3，a1＝7.8867b1，a2＝-0.7087b2，a3＝13.675b3(ii) a The coefficient a can be obtained by regression calculation0、a1、a2、a3Respectively, have a value of：-529.57、-8.4669、3.3047、88.9987。
Therefore, the temperature of the molten metal is controlled,
example 1
Respectively selecting one well (A well, B well, C well and D well) from four different region stratums of the Ordos basin, and respectively testing CO by a tubule experiment and the method provided by the invention2A minimum miscible pressure value with the formation crude oil;
(1) the minimum miscible pressure values of the well A, the well B, the well C and the well D are respectively 22.15MPa, 17.80MPa, 14.28MPa and 18.52MPa through a tubule experiment;
(2) testing of CO by the method provided by the invention2Sampling the formation crude oil of the well at first according to the minimum miscible pressure value of the formation crude oil, carrying out PVT (physical vapor transport) experiment by using the sampled crude oil, and obtaining the mole fraction X of volatile components of four wells through experimental testsvolThe mole fraction X of the intermediate hydrocarbon componentintAnd average molecular weight M of heavy componentC7 +See tables 1 and 2, wherein CXRepresents alkane with X element number;
wherein the volatile component comprises CH4、N2、CO2、H2S, the middle hydrocarbon component being C2H6-C6H14I.e. C2-C6Heavy components including C7H16-C120H242I.e. C7-C120Of (a) an alkane.
TABLE 1 formation crude Properties for four wells
TABLE 2 detailed parameters of the formation crude oil physical properties of four wells
The parameters in Table 1 are respectively substituted into the following formulas
As a result, P was obtainedmm(A)＝22.41MPa，Pmm(B)＝18.17MPa，Pmm(C)＝14.69MPa，Pmm(D)＝18.86MPa。
Comparing with the minimum miscible pressure value obtained by a tubule experiment, the CO of the four areas can be known2The calculated relative errors with the minimum miscible pressure of the formation crude oil are 1.17%, 2.07%, 2.87% and 1.84%, respectively. Four regional CO's were calculated using the methods herein2The relative error of the minimum miscible pressure of the formation crude oil and the formation crude oil does not exceed 5 percent, which indicates that the method is used for calculating the CO of the Ordos basin2The minimum miscible pressure with the crude oil of the stratum is accurate. Table 3 is a table comparing the minimum miscible pressure values measured by the tubule experiment and the method of the present invention. Fig. 4 is a graph comparing the minimum miscible pressure values measured by a tubule experiment and the method proposed by the present invention.
TABLE 3 comparison of calculated values with minimum miscible pressure measured in tubule experiments
Claims (1)
1. The minimum miscible pressure calculation method of Ordos basin carbon dioxide and formation crude oil is characterized by comprising the following steps of: sampling crude oil in Ordos basin, analyzing fluid composition by gas chromatography to obtain molar fraction X of volatile componentsvolMolar fraction X of the intermediate hydrocarbon componentintAnd the average molecular weight M of the heavy componentC7 +Substituting into the following formula to obtain CO2Minimum miscible pressure P with formation crude oilmm；
Wherein the volatile component comprises CH4、N2、CO2、H2S, the middle hydrocarbon component being C2H6-C6H14Heavy component comprising C7H16-C120H242。
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| 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 |
| 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 |
Citations (6)
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| CN102798499A (en) * | 2012-08-15 | 2012-11-28 | 中国石油天然气股份有限公司 | Multi-tube type minimum mixed-phase pressure measuring method and device |
| CN104462753A (en) * | 2014-10-31 | 2015-03-25 | 中国石油化工股份有限公司 | CO2 flooding minimum miscrible pressure prediction method |
| CN105181222A (en) * | 2015-10-12 | 2015-12-23 | 东北石油大学 | Device for measuring carbon dioxide minimum miscible pressure in multiple modes |
| CN105401926A (en) * | 2015-11-24 | 2016-03-16 | 中国石油天然气股份有限公司 | Petroleum reservoir carbon dioxide miscible flooding pressure prediction method and device |
| CN106840790A (en) * | 2016-12-23 | 2017-06-13 | 东北石油大学 | CO is tested based on tubule consolidated model long2The method and system of crude oil MMP |
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Patent Citations (6)
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| CN102798499A (en) * | 2012-08-15 | 2012-11-28 | 中国石油天然气股份有限公司 | Multi-tube type minimum mixed-phase pressure measuring method and device |
| CN104462753A (en) * | 2014-10-31 | 2015-03-25 | 中国石油化工股份有限公司 | CO2 flooding minimum miscrible pressure prediction method |
| CN105181222A (en) * | 2015-10-12 | 2015-12-23 | 东北石油大学 | Device for measuring carbon dioxide minimum miscible pressure in multiple modes |
| CN105401926A (en) * | 2015-11-24 | 2016-03-16 | 中国石油天然气股份有限公司 | Petroleum reservoir carbon dioxide miscible flooding pressure prediction method and device |
| CN106840790A (en) * | 2016-12-23 | 2017-06-13 | 东北石油大学 | CO is tested based on tubule consolidated model long2The 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 |
Non-Patent Citations (1)
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| 陈百炼等.改进的CO2-原油最小混相压力计算模型.《石油天然气学报》.2013,第35卷(第2期),126-131. * |
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