CN105003234A - Novel method for judging gas channeling of carbon dioxide drive reservoir - Google Patents
Novel method for judging gas channeling of carbon dioxide drive reservoir Download PDFInfo
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- CN105003234A CN105003234A CN201410154560.2A CN201410154560A CN105003234A CN 105003234 A CN105003234 A CN 105003234A CN 201410154560 A CN201410154560 A CN 201410154560A CN 105003234 A CN105003234 A CN 105003234A
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Abstract
The present invention provides a novel method for judging gas channeling of a carbon dioxide drive reservoir. The method comprises a first step of collecting gas oil ratios and carbon dioxide contents in output gases of carbon dioxide drive reservoir oil wells, and drawing a relation chart of the produced gas oil ratios and the carbon dioxide contents in output gases; a second step of dividing the relation chart of the produced gas oil ratios and the carbon dioxide contents in output gases into a plurality of regions according to the current formation pressure level crude oil properties; and a third step of analyzing characteristics of the regions and judging a top right corner region of the relation chart of the produced gas oil ratios and the carbon dioxide contents in output gases as a carbon dioxide gas channeling region. According to the novel method for judging gas channeling of the carbon dioxide drive reservoir, the relation chart can be divided into different regions according to changes of the gas oil ratio and the carbon dioxide content, thereby rapidly and accurately judging if gas channeling occurs in a carbon dioxide drive well, and providing bases for parameter deployment of the carbon dioxide drive reservoir.
Description
Technical field
The present invention relates to oil development technical field, particularly relate to a kind of new method judging carbon dioxide flooding oil reservoir has channeling.
Background technology
Carbon dioxide flooding has critical role in raising oil recovery factor (EOR).Within 2012, external carbon dioxide flooding EOR output accounts for 24% of EOR total output; Domestic carbon dioxide flooding also comes into one's own gradually, starts application in oil fields such as triumph, Jilin, Central Plains.
Because carbon dioxide viscosity is lower, its fluid ability in oil reservoir is far above the fluid ability of crude oil, very easily there is has channeling, carbon dioxide has channeling will cause crude output to decline, unfavorable to oil field development, therefore, be necessary to judge in time that carbon dioxide has channeling in oil reservoir whether, reduces or eliminate to take appropriate measures the impact that has channeling brings.We have invented a kind of new method of judgement carbon dioxide flooding oil reservoir has channeling newly for this reason, solve above technical problem.
Summary of the invention
The object of this invention is to provide a kind of new method judging carbon dioxide flooding oil reservoir has channeling.
Object of the present invention realizes by following technical measures: the new method judging carbon dioxide flooding oil reservoir has channeling, the new method of this judgement carbon dioxide flooding oil reservoir has channeling comprises: step 1, compile gas-oil ratio and the output air carbon dioxide content of carbon dioxide flooding oil reservoir oil well, draw the Core analysis of production gas-oil ratio and output air carbon dioxide content; Step 2, according to current formation pressure level and oil property, is divided into multiple region by the Core analysis of this production gas-oil ratio and output air carbon dioxide content; And step 3, analyze the feature in each region, judge that the upper right comer region of the Core analysis of this production gas-oil ratio and output air carbon dioxide content is the region of carbon dioxide has channeling.
Object of the present invention also realizes by following technical measures:
In step 2, find two special production gas-oil ratios and two special carbon dioxide contents, and then the Core analysis of this production gas-oil ratio and output air carbon dioxide content is divided into 9 regions.
In step 2, according to the amount of the production gas-oil ratio of the original reservoir condition sub-surface crude oil and the correspondingly carbon dioxide that stressor layer sub-surface crude oil can be saturated, the production gas-oil ratio that two special is found.
In step 2, using the production gas-oil ratio of the original reservoir condition sub-surface crude oil as the first production gas-oil ratio, using the correspondingly amount of the carbon dioxide that stressor layer sub-surface crude oil can be saturated and the production gas-oil ratio sum of the original reservoir condition sub-surface crude oil as second production gas-oil ratio; The Core analysis of production gas-oil ratio and output air carbon dioxide content is from left to right divided into three regions by above-mentioned two production gas-oil ratios: gas-oil ratio is less than the region of the first production gas-oil ratio, the region of gas-oil ratio between the first production gas-oil ratio and the second production gas-oil ratio, gas-oil ratio is greater than the region of the second production gas-oil ratio.
In step 2, according to the carbon dioxide content of the original reservoir condition well-sinking output gas and the correspondingly carbon dioxide content of pit shaft output gas after the saturated carbon dioxide of stressor layer sub-surface crude oil, the carbon dioxide content that two special is found.
In step 2, using the carbon dioxide content of the original reservoir condition well-sinking output gas as the first carbon dioxide content, using the carbon dioxide content of pit shaft output gas after saturated for in-place oil carbon dioxide as the second carbon dioxide content; The Core analysis of production gas-oil ratio and output air carbon dioxide content is divided into three regions from bottom to top by above-mentioned two carbon dioxide contents: carbon dioxide content is less than the region of the first carbon dioxide content, the region of carbon dioxide content between the first carbon dioxide content and the second carbon dioxide content, carbon dioxide content is greater than the region of the second carbon dioxide content.
The new method of the judgement carbon dioxide flooding oil reservoir has channeling in the present invention, by compiling gas-oil ratio and the output air carbon dioxide content of carbon dioxide flooding oil reservoir, draw the Core analysis of production gas-oil ratio and output air carbon dioxide content, according to gas-oil ratio, carbon dioxide content change, interval division is carried out to Core analysis, whether judge carbon dioxide has channeling accordingly.
Accompanying drawing explanation
Fig. 1 is the flow chart of an instantiation of the new method of judgement carbon dioxide flooding oil reservoir has channeling of the present invention;
Fig. 2 is the Core analysis of production gas-oil ratio and output air carbon dioxide content in an instantiation of the present invention.
Detailed description of the invention
For making above and other object of the present invention, feature and advantage can become apparent, cited below particularly go out preferred embodiment, and coordinate institute's accompanying drawings, be described in detail below.
As shown in Figure 1, Fig. 1 is the flow chart of a specific embodiment of the new method of judgement carbon dioxide flooding oil reservoir has channeling of the present invention.
In step 101, compile production gas-oil ratio and the output air carbon dioxide content of carbon dioxide flooding oil reservoir, draw the Core analysis of production gas-oil ratio and output air carbon dioxide content.Flow process enters into step 102.
In step 102, according to current formation pressure level and oil property, and then production gas-oil ratio and output air carbon dioxide relation with contents plate are divided into multiple region.In instances, according to two special production gas-oil ratios and two special carbon dioxide contents, production gas-oil ratio and output air carbon dioxide relation with contents plate are divided into 9 regions.
In the Changing Pattern of gas-oil ratio, two special production gas-oil ratios are as the foundation of interval division: the production gas-oil ratio of the original reservoir condition sub-surface crude oil, as the first production gas-oil ratio; In-place oil can be saturated the amount of carbon dioxide and the production gas-oil ratio sum of the original reservoir condition sub-surface crude oil, as the second production gas-oil ratio.The Core analysis of production gas-oil ratio and output air carbon dioxide content is from left to right divided into three regions by above-mentioned two production gas-oil ratios: gas-oil ratio is less than the region of the first production gas-oil ratio, the region of gas-oil ratio between the first production gas-oil ratio and the second production gas-oil ratio, gas-oil ratio is greater than the region of the second production gas-oil ratio.
In the Changing Pattern of pit shaft output air carbon dioxide content, two special carbon dioxide contents are as the foundation of interval division: the carbon dioxide content of the original reservoir condition well-sinking output gas, as the first carbon dioxide content; The carbon dioxide content of pit shaft output gas after the saturated carbon dioxide of in-place oil, as the second carbon dioxide content.The Core analysis of production gas-oil ratio and output air carbon dioxide content is divided into three regions from bottom to top by above-mentioned two carbon dioxide contents: carbon dioxide content is less than the region of the first carbon dioxide content, the region of carbon dioxide content between the first carbon dioxide content and the second carbon dioxide content, carbon dioxide content is greater than the region of the second carbon dioxide content.Flow process enters into step 103.
In step 103, analyze the feature in each region, judge that the Core analysis upper right comer region of production gas-oil ratio and output air carbon dioxide content is the region of carbon dioxide has channeling.That is, when production gas-oil ratio and carbon dioxide content relation data point are positioned at the upper right side of plate, this carbon dioxide flooding oil reservoir generation has channeling can be judged.
In an application instantiation of the present invention, for high 89-1 block carbon dioxide flooding trial zone, introduce the effect of the method.
In the Changing Pattern of gas-oil ratio, two special production gas-oil ratios are as the foundation of interval division: the production gas-oil ratio of crude oil under the original reservoir condition, add up about 50m according to mining site
3/ t(primary Korean pine forest); Crude oil per ton maximum saturated carbon dioxide 200m during strata pressure 30MPa
3, the production gas-oil ratio 50m of crude oil under the original reservoir condition
3/ t, under the amount of the carbon dioxide that in-place oil can be saturated and the original reservoir condition, the production gas-oil ratio sum of crude oil is 250m
3/ t.According to above-mentioned two special production gas-oil ratios, high 89-1 block production gas-oil ratio and carbon dioxide content relation data point from left to right can be divided into three intervals: < 50m
3/ t, 50-250m
3/ t, > 250m
3/ t.
In the Changing Pattern of output air carbon dioxide content, two special output air carbon dioxide content is as the foundation of interval division: the carbon dioxide content of output gas under the original reservoir condition, and experimentally data are analyzed in room is about 3%; During strata pressure 30MPa, after the saturated carbon dioxide of in-place oil, the carbon dioxide content of output gas equals the production gas-oil ratio 50m that 80%(considers crude oil under the original reservoir condition
3/ t, the maximum saturated carbon dioxide 200m of crude oil per ton
3).The carbon dioxide content that foundation two is special, can be divided into three interval: < 3%, 3-80%, > 80% from bottom to top high 89-1 block production gas-oil ratio and carbon dioxide content relation data point.
Fig. 2 is the Core analysis of production gas-oil ratio and output air carbon dioxide content in a specific embodiment of the present invention.In fig. 2, according to production gas-oil ratio, output air carbon dioxide content, Core analysis can be divided into nine regions, from left to right number consecutively is 1-9 district from bottom to top.
9th district (production gas-oil ratio > 250m
3/ t, carbon dioxide content > 80%): well point output gas bag is containing the lighter hydrocarbons of crude oil autolysis and the carbon dioxide of injection, and the carbon dioxide part injected is saturated at in-place oil, another part may exist with free state, causes production gas-oil ratio and carbon dioxide content all higher; Oil well generation has channeling.
Claims (6)
1. judge the new method of carbon dioxide flooding oil reservoir has channeling, it is characterized in that, the new method of this judgement carbon dioxide flooding oil reservoir has channeling comprises:
Step 1, compiles gas-oil ratio and the output air carbon dioxide content of carbon dioxide flooding oil reservoir oil well, draws the Core analysis of production gas-oil ratio and output air carbon dioxide content;
Step 2, according to current formation pressure level and oil property, is divided into multiple region by the Core analysis of this production gas-oil ratio and output air carbon dioxide content; And
Step 3, analyzes the feature in each region, judges that the upper right comer region of the Core analysis of this production gas-oil ratio and output air carbon dioxide content is the region of carbon dioxide has channeling.
2. the new method of judgement carbon dioxide flooding oil reservoir has channeling according to claim 1, it is characterized in that, in step 2, find two special production gas-oil ratios and two special carbon dioxide contents, and then the Core analysis of this production gas-oil ratio and output air carbon dioxide content is divided into 9 regions.
3. the new method of judgement carbon dioxide flooding oil reservoir has channeling according to claim 2, it is characterized in that, in step 2, according to the amount of the production gas-oil ratio of the original reservoir condition sub-surface crude oil and the correspondingly carbon dioxide that stressor layer sub-surface crude oil can be saturated, find the production gas-oil ratio that two special.
4. the new method of judgement carbon dioxide flooding oil reservoir has channeling according to claim 3, it is characterized in that, in step 2, using the production gas-oil ratio of the original reservoir condition sub-surface crude oil as the first production gas-oil ratio, using the correspondingly amount of the carbon dioxide that stressor layer sub-surface crude oil can be saturated and the production gas-oil ratio sum of the original reservoir condition sub-surface crude oil as second production gas-oil ratio; The Core analysis of production gas-oil ratio and output air carbon dioxide content is from left to right divided into three regions by above-mentioned two production gas-oil ratios: gas-oil ratio is less than the region of the first production gas-oil ratio, the region of gas-oil ratio between the first production gas-oil ratio and the second production gas-oil ratio, gas-oil ratio is greater than the region of the second production gas-oil ratio.
5. the new method of judgement carbon dioxide flooding oil reservoir has channeling according to claim 2, it is characterized in that, in step 2, according to the carbon dioxide content of the original reservoir condition well-sinking output gas and the correspondingly carbon dioxide content of pit shaft output gas after the saturated carbon dioxide of stressor layer sub-surface crude oil, find the carbon dioxide content that two special.
6. the new method of judgement carbon dioxide flooding oil reservoir has channeling according to claim 5, it is characterized in that, in step 2, using the carbon dioxide content of the original reservoir condition well-sinking output gas as the first carbon dioxide content, using the carbon dioxide content of pit shaft output gas after saturated for in-place oil carbon dioxide as the second carbon dioxide content; The Core analysis of production gas-oil ratio and output air carbon dioxide content is divided into three regions from bottom to top by above-mentioned two carbon dioxide contents: carbon dioxide content is less than the region of the first carbon dioxide content, the region of carbon dioxide content between the first carbon dioxide content and the second carbon dioxide content, carbon dioxide content is greater than the region of the second carbon dioxide content.
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Cited By (3)
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| CN113863903A (en) * | 2021-09-23 | 2021-12-31 | 西安石油大学 | Quantitative division method for carbon dioxide flooding gas injection stage |
| CN115341881A (en) * | 2021-04-27 | 2022-11-15 | 中国石油天然气股份有限公司 | Gas channeling identification method based on characteristic component content |
| CN115584952A (en) * | 2022-10-13 | 2023-01-10 | 新疆敦华绿碳技术股份有限公司 | Method and system for judging gas channeling of carbon dioxide flooding reservoir |
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| CN115584952A (en) * | 2022-10-13 | 2023-01-10 | 新疆敦华绿碳技术股份有限公司 | Method and system for judging gas channeling of carbon dioxide flooding reservoir |
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