CN113075750B - Method for determining minimum miscible pressure of carbon dioxide and crude oil in stratum - Google Patents
Method for determining minimum miscible pressure of carbon dioxide and crude oil in stratum Download PDFInfo
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- CN113075750B CN113075750B CN202010006259.2A CN202010006259A CN113075750B CN 113075750 B CN113075750 B CN 113075750B CN 202010006259 A CN202010006259 A CN 202010006259A CN 113075750 B CN113075750 B CN 113075750B
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- 238000000034 method Methods 0.000 title claims abstract description 37
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 239000010779 crude oil Substances 0.000 title claims abstract description 16
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 8
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 8
- 239000003921 oil Substances 0.000 claims abstract description 44
- 230000005484 gravity Effects 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 239000008186 active pharmaceutical agent Substances 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims 2
- 238000004364 calculation method Methods 0.000 abstract description 12
- 239000003208 petroleum Substances 0.000 abstract description 6
- 238000000605 extraction Methods 0.000 abstract description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 230000003416 augmentation Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 210000005239 tubule Anatomy 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
-
- G01V20/00—
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
Abstract
The invention provides a method for determining the minimum miscible pressure of carbon dioxide and crude oil in a stratum, which comprises the following steps: selecting oil fields in a oil storage area to be made into various experimental groups; according to the stratum oil system mole specific gravity model:
Description
Technical Field
The invention relates to the technical field of oil reservoir development, in particular to a method for determining the minimum miscible pressure of carbon dioxide and crude oil in a stratum.
Background
By CO 2 The flooding exploitation method is one of the main technologies of effectively supplementing stratum energy and improving crude oil recovery rate of a low-permeability oil reservoir, the flooding efficiency of mixed phase flooding is better than that of non-mixed phase flooding, and the minimum mixed phase pressure (MMP) is used for judging whether mixed phase flooding can be realized or not and predicting CO 2 Important basic parameters of the driving effect.
In the prior art, a minimum miscible pressure calculation method is disclosed, the method obtains the minimum miscible pressure error of the same sample by comparing a tubule displacement experiment method with a theoretical formula method, and the empirical constant is obtained by substituting 4 sample basic parameters into a logarithmic formula and then establishing an augmentation matrix. And then fitting the minimum miscible pressure of the low permeability reservoir and the basic parameters to obtain a calculation formula model. The prior art also discloses a minimum miscible pressure calculation method, wherein the mole fraction of the volatile components of the crude oil of the stratum, the mole fraction of the middle hydrocarbon components and the average molecular weight of the heavy components are determined through experiments, and the minimum miscible pressure is calculated by substituting the mole fraction of the middle hydrocarbon components and the average molecular weight of the heavy components into a formula. In addition, the prior art also discloses a minimum miscible pressure calculation method, which obtains the minimum miscible pressure error of the same sample by comparing a tubule displacement experiment method with a theoretical formula method, and establishes an augmentation matrix to obtain a calculation formula model, thereby obtaining the minimum miscible pressure. The method for calculating the minimum miscible pressure in the prior art adopts a calculation model which has higher experimental dependence, and has higher difficulty in acquiring partial parameters, so that calculation errors are large, and the calculation result is difficult to be applied to the actual application of calculating the minimum miscible pressure of the Soshould basin in the Xinjiang oil field.
Disclosure of Invention
The invention mainly aims to provide a method for determining the minimum miscible pressure of carbon dioxide and crude oil in a stratum, so as to solve the problem of large calculation error of the minimum miscible pressure in the prior art.
To achieve the above object, according to one aspect of the present invention, there is provided a method for determining a minimum miscible pressure of carbon dioxide and crude oil of a formation, the method comprising the steps of: selecting oil fields in a oil storage area to be made into various experimental groups; according to the stratum oil system mole specific gravity model:determining a plurality of groups of a values and b values, respectively performing linear fitting on the a values and the b values, establishing a new oil system molar specific gravity model according to the fitted a values and b values, and determining the minimum miscible pressure according to the new oil system molar specific gravity model and a miscible pressure empirical model, wherein MW is the stratum oil system molar specific gravity; a. b is a regression coefficient; g is the API gravity of crude oil.
Further, the minimum miscible pressure is obtained by the following formula:
wherein T is the reservoir temperature in degrees Fahrenheit; MMP is the minimum miscible pressure in psi.
Further, the method comprises the steps of,wherein r is o Is the relative density of oil and water.
Further, the method comprises the steps of,ρ o is the density of crude oil in stratum, and the unit is g/cm 3 ；ρ w Is the water density of the stratum, and the unit is 1g/cm 3 。
Further, a new oil system molar weight model is established according to the fitted a value and b value, and the model is as follows:where MW' is the molar specific gravity of the oil system established from the fitted values a and b.
By using the technical scheme of the invention, the oil field needing to be used for oil extraction and storage is used as a plurality of experimental components, the traditional method for determining the minimum miscible pressure is corrected by using the miscible pressure empirical model and the fitted oil system molar specific gravity model, so that the accuracy of minimum miscible pressure calculation is effectively improved, and meanwhile, the data obtained by adopting the method is easy, so that the technical scheme has strong operability, is convenient to use in the actual petroleum exploitation process, and effectively improves the petroleum exploitation efficiency.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present invention will be described in detail with reference to examples.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and in the claims are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those described or illustrated herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
According to a specific embodiment of the present application, there is provided a method of determining a minimum miscible pressure of carbon dioxide and crude oil of a formation, the method comprising the steps of: selecting oil fields in a oil storage area to be made into various experimental groups; according to the stratum oil system mole specific gravity model:determining a plurality of groups of a values and b values, respectively performing linear fitting on the a values and the b values, establishing a new oil system molar specific gravity model according to the fitted a values and b values, and determining the minimum miscible pressure according to the new oil system molar specific gravity model and a miscible pressure empirical model, wherein MW is the stratum oil system molar specific gravity; a. b is a regression coefficient; g is the API gravity of crude oil.
Further, the minimum miscible pressure is obtained by the following formula:
wherein T is the reservoir temperature in degrees Fahrenheit; MMP is the minimum miscible pressure in psi.
In the embodiment, the oil field needing to be used for oil extraction and storage is used as a plurality of experimental components, the traditional method for determining the minimum miscible pressure is corrected through the miscible pressure empirical model and the fitted oil system molar specific gravity model, so that the accuracy of minimum miscible pressure calculation is effectively improved, meanwhile, the data obtained by adopting the method are easy, the technical scheme is high in operability, convenient to use in the actual petroleum exploitation process, and the petroleum exploitation efficiency is effectively improved.
Wherein the minimum miscible pressure is obtained by the following formula:
wherein T is the reservoir temperature in degrees Fahrenheit; MMP is the minimum miscible pressure in psi. />Wherein r is o Is the relative density of oil and water. />ρ o Is the density of crude oil in stratum, and the unit is g/cm 3 ；ρ w Is the water density of the stratum, and the unit is 1g/cm 3 . And establishing a new oil system molar weight model according to the fitted a value and b value as follows: />Where MW' is the molar specific gravity of the oil system established from the fitted values a and b.
In addition to the foregoing, references in the specification to "one embodiment," "another embodiment," "an embodiment," etc., mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described in general terms in the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is intended that such feature, structure, or characteristic be implemented within the scope of the invention.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A method for determining a minimum miscible pressure of carbon dioxide and crude oil in a formation, the method comprising the steps of:
selecting an oil field in a oil storage area to be made into a plurality of experimental groups;
according to the stratum oil system mole specific gravity model:determining a plurality of groups of a value and b value, respectively performing linear fitting on the a value and the b value of the plurality of groups, establishing a new oil system molar specific gravity model according to the a value and the b value after fitting, determining the minimum miscible pressure according to the new oil system molar specific gravity model and the miscible pressure empirical model, wherein,
MW is the formation oil system mole specific gravity;
a. b is a regression coefficient;
g is the API degree of crude oil;
the minimum miscible pressure is obtained by the following formula:
wherein T is the reservoir temperature in degrees Fahrenheit;
MMP is the minimum miscible pressure in psi;
the new oil system molar weight model is established according to the fitted a value and b value, and is as follows:
where MW' is the molar specific gravity of the oil system established from the fitted values a and b.
2. The method of claim 1, wherein the step of determining the position of the substrate comprises,
wherein r is o Is the relative density of oil and water.
3. The method of claim 1, wherein the step of determining the position of the substrate comprises,
ρ o is the density of crude oil in stratum, and the unit is g/cm 3 ；
ρ w Is the water density of the stratum, and the unit is 1g/cm 3 。
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| CN113075750B true CN113075750B (en) | 2023-07-25 |
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Citations (5)
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|---|---|---|---|---|
| US4589486A (en) * | 1984-05-01 | 1986-05-20 | Texaco Inc. | Carbon dioxide flooding with a premixed transition zone of carbon dioxide and crude oil components |
| CN102337874A (en) * | 2011-09-07 | 2012-02-01 | 西南石油大学 | Method for reducing minimum miscible phase pressure between CO2 and crude oil of miscible phase displacement |
| CN106021778A (en) * | 2016-05-31 | 2016-10-12 | 中国海洋石油总公司 | Method for determining CO2 simulation displacement performance miscibility pressure |
| CN108952648A (en) * | 2018-08-30 | 2018-12-07 | 陕西延长石油(集团)有限责任公司研究院 | Ordos Basin carbon dioxide and in-place oil minimum miscibility pressure calculation method |
| CN110059435A (en) * | 2019-04-27 | 2019-07-26 | 西南石油大学 | A kind of non-pure carbon dioxide mixed phase drive minimum miscibility pressure GWO-LSSVM prediction technique |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9851339B2 (en) * | 2014-08-15 | 2017-12-26 | Energy And Environmental Research Center Foundation | Sampling an oil composition and determining minimum miscibility pressure of an oil composition with a fluid |
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2020
- 2020-01-03 CN CN202010006259.2A patent/CN113075750B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4589486A (en) * | 1984-05-01 | 1986-05-20 | Texaco Inc. | Carbon dioxide flooding with a premixed transition zone of carbon dioxide and crude oil components |
| CN102337874A (en) * | 2011-09-07 | 2012-02-01 | 西南石油大学 | Method for reducing minimum miscible phase pressure between CO2 and crude oil of miscible phase displacement |
| CN106021778A (en) * | 2016-05-31 | 2016-10-12 | 中国海洋石油总公司 | Method for determining CO2 simulation displacement performance miscibility pressure |
| CN108952648A (en) * | 2018-08-30 | 2018-12-07 | 陕西延长石油(集团)有限责任公司研究院 | Ordos Basin carbon dioxide and in-place oil minimum miscibility pressure calculation method |
| CN110059435A (en) * | 2019-04-27 | 2019-07-26 | 西南石油大学 | A kind of non-pure carbon dioxide mixed phase drive minimum miscibility pressure GWO-LSSVM prediction technique |
Non-Patent Citations (2)
| Title |
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| 《石油地质与工程》2019年（第33卷）总目次;曾隽 等;《石油地质与工程》;20191125(第06期);全文 * |
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