CN105134146A - Method for oil displacement using carbon dioxide and foam - Google Patents
Method for oil displacement using carbon dioxide and foam Download PDFInfo
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- CN105134146A CN105134146A CN201510393938.9A CN201510393938A CN105134146A CN 105134146 A CN105134146 A CN 105134146A CN 201510393938 A CN201510393938 A CN 201510393938A CN 105134146 A CN105134146 A CN 105134146A
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Abstract
The invention discloses a method for oil displacement using carbon dioxide and foam. The method can be applied to low-permeability high-mineralization stratums, carbon dioxide and an aqueous solution containing a foaming agent are alternately injected to raise the efficiency of oil displacement, the low permeability means that the permeability is within the range of 1 to 10 mD, and the high mineralization means that the mineralization is less than 100 g/L. The method for oil displacement using carbon dioxide and foam is easy to operate, oil displacement using carbon dioxide and oil displacement using foam are combined, defects of oil displacement using a single material can be overcome, and the efficiency of oil displacement in low-permeability high-mineralization stratums can be distinctly raised.
Description
Technical field
The present invention relates to a kind of method improving oil recovery, belong to technical field of petroleum extraction, be specially a kind of method of the carbon dioxide foaming displacement of reservoir oil.
Background technology
Usually adopt carbon dioxide drive to belong to the gas injection development in oil field in prior art, during injected gas displace crude oil, can with crude oil mixed phase, form solution-air miscible-phase displacement, eliminate the impact of boundary, thus improve gas displacement efficiency.But gas flow is more taller than water, between Er Qieqi, oil, density contrast is very big, there is viscous fingering and the serious deficiency of gravity segregation phenomenon.
Gas can be formed as decentralized photo, surfactant solution as the mixed system-foam of decentralized medium during foam flooding, there is the apparent viscosity more much higher than gas, surfactant solution, flow resistance when it flows in oil reservoir is far away higher than injection water or gas, thus improve the mobility ratio of oil displacement agent and oil, add the sweep efficiency of oil displacement agent.
Summary of the invention
The object of this invention is to provide a kind of method of the carbon dioxide foaming displacement of reservoir oil, be applied to the recovery ratio of the raising oil under low-permeability, high salinity formation condition.
The present invention adopts following technical scheme:
A kind of method of the carbon dioxide foaming displacement of reservoir oil, under the method is used for low-permeability high salinity formation condition, carbon dioxide and the aqueous solution containing frother are adopted the mode of alter least-squares, improve oil displacement efficiency, described low-permeability be permeability in 1-10mD scope, described high salinity is that salinity is less than 100g/L.
As the further scheme of the present invention, the mode of described alter least-squares, carbon dioxide and the total slug injection rate of the aqueous solution containing frother are at 0.3-0.6PV.
As the further scheme of the present invention, the mode of described alter least-squares, carbon dioxide and each alter least-squares amount of the aqueous solution two kinds of fluids containing frother are at 0.05-0.2PV.
As the further scheme of the present invention, described frother is the surfactant with better frothing capacity and better salt resistant character, is Alkyl-polyglycosides (APG1214) or amphitypy ionic surfactant Cocoamidopropyl betaine (CAB-35).
As the further scheme of the present invention, the working concentration of described Alkyl-polyglycosides (APG1214) or amphitypy ionic surfactant cocamidopropyl propyl amide beet (CAB-35) is 0.3-0.5%.
Beneficial effect of the present invention: carbon dioxide foaming flooding method of the present invention, simple to operate, combine the advantage of carbon dioxide drive and foam flooding, compensate for shortcoming when it is used alone separately, oil displacement efficiency can be significantly improved under low-permeability, high salinity condition.
Accompanying drawing explanation
Fig. 1 is the concrete displacement curve map of embodiment 1;
Fig. 2 is the concrete displacement curve map of embodiment 2;
Detailed description of the invention
Below in conjunction with embodiment, further detailed description is done to technical scheme of the present invention:
Example 1
The aqueous solution of preparation Alkyl-polyglycosides (APG1214) mass fraction to be 0.3%, NaCl content be 60g/L.
Following steps are all carried out under simulated formation temperature 50 C condition.
To diameter 2.50cm, length 10.0cm, carry out saturation water, saturated oils process.This experiment core parameters is: degree of porosity 15.19%, voids volume 7.364mL, perm-plug method 8.035mD, original oil saturation ratio 44.3%.
Carry out water drive oil to exporting moisture more than 98% to above-mentioned rock core, injection pressure is 4.0MPa, and now oil-water displacement efficiency is 28.2%.
Under the condition of injection pressure 4.0MPa, inject the surfactant solution 0.1PV of preparation, carbon dioxide 0.1PV, alter least-squares three times, total injection rate is 0.6PV.
Sequent water flooding oil is to exporting moisture more than 98%, and now total oil displacement efficiency is 41.4%, and improve 13.2% compared to oil-water displacement efficiency, concrete displacement curve is shown in accompanying drawing 1.
Example 2
The aqueous solution of preparation amphitypy ionic surfactant Cocoamidopropyl betaine (CAB-35) mass fraction to be 0.3%, NaCl content be 60g/L.
Following steps are all carried out under simulated formation temperature 50 C condition.
To diameter 2.50cm, length 10.0cm, carry out saturation water, saturated oils process.This experiment core parameters is: degree of porosity 14.89%, voids volume 7.180mL, perm-plug method 7.271mD, original oil saturation ratio 52.5%.
Carry out water drive oil to exporting moisture more than 98% to above-mentioned rock core, injection pressure is 4.0MPa, and now oil-water displacement efficiency is 27.4%.
Under the condition of injection pressure 4.0MPa, inject the surfactant solution 0.1PV of preparation, carbon dioxide 0.1PV, alter least-squares three times, total injection rate is 0.6PV.
Sequent water flooding oil is to exporting moisture more than 98%, and now total oil displacement efficiency is 41.8%, and improve 14.4% compared to oil-water displacement efficiency, concrete displacement curve is shown in accompanying drawing 2.
Should be understood that above-described embodiment further illustrates content of the present invention; but this should be interpreted as that the above-mentioned subject area of the present invention is only limitted to above-described embodiment, all technology realized based on foregoing principle all belong to protection scope of the present invention.
Claims (5)
1. the method for a carbon dioxide foaming displacement of reservoir oil, it is characterized in that, under the method is used for low-permeability high salinity formation condition, carbon dioxide and the aqueous solution containing frother are adopted the mode of alter least-squares, improve oil displacement efficiency, described low-permeability be permeability in 1-10mD scope, described high salinity is that salinity is less than 100g/L.
2. the method for a kind of carbon dioxide foaming displacement of reservoir oil according to claim 1, is characterized in that, the mode of described alter least-squares, and carbon dioxide and the total slug injection rate of the aqueous solution containing frother are at 0.3-0.6PV.
3. the method for a kind of carbon dioxide foaming displacement of reservoir oil according to claim 1, is characterized in that, the mode of described alter least-squares, and carbon dioxide and each alter least-squares amount of the aqueous solution two kinds of fluids containing frother are at 0.05-0.2PV.
4. the method for a kind of carbon dioxide foaming displacement of reservoir oil according to claim 1, it is characterized in that, described frother is the surfactant with better frothing capacity and better salt resistant character, is Alkyl-polyglycosides or amphitypy ionic surfactant Cocoamidopropyl betaine.
5. the method for a kind of carbon dioxide foaming displacement of reservoir oil according to claim 4, is characterized in that, the working concentration of described Alkyl-polyglycosides or amphitypy ionic surfactant Cocoamidopropyl betaine is 0.3-0.5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510393938.9A CN105134146A (en) | 2015-07-07 | 2015-07-07 | Method for oil displacement using carbon dioxide and foam |
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| CN201510393938.9A CN105134146A (en) | 2015-07-07 | 2015-07-07 | Method for oil displacement using carbon dioxide and foam |
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| CN105134146A true CN105134146A (en) | 2015-12-09 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105952425A (en) * | 2016-07-11 | 2016-09-21 | 中国石油大学(华东) | Method for improving ordinary heavy oil reservoir recovery ratio by adopting chemical agents to assist CO2 huff and puff |
| CN106089166A (en) * | 2016-06-17 | 2016-11-09 | 中国石油大学(华东) | A kind of fine and close oil reservoir CO2foam handle up improve recovery ratio method |
| CN106988711A (en) * | 2017-03-24 | 2017-07-28 | 西安石油大学 | A kind of method for improving strong vertical heterogeneity oil reservoir oil displacement effect |
| CN110317598A (en) * | 2018-03-30 | 2019-10-11 | 中国石油化工股份有限公司 | Improve compact reservoir CO2Drive the aqueous solution of effect and its preparation method and application method |
| CN112983367A (en) * | 2021-03-15 | 2021-06-18 | 西北大学 | Application of toxoplasma bacteria in evaluation of microbial oil displacement field test effect and method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089166A (en) * | 2016-06-17 | 2016-11-09 | 中国石油大学(华东) | A kind of fine and close oil reservoir CO2foam handle up improve recovery ratio method |
| CN105952425A (en) * | 2016-07-11 | 2016-09-21 | 中国石油大学(华东) | Method for improving ordinary heavy oil reservoir recovery ratio by adopting chemical agents to assist CO2 huff and puff |
| CN106988711A (en) * | 2017-03-24 | 2017-07-28 | 西安石油大学 | A kind of method for improving strong vertical heterogeneity oil reservoir oil displacement effect |
| CN110317598A (en) * | 2018-03-30 | 2019-10-11 | 中国石油化工股份有限公司 | Improve compact reservoir CO2Drive the aqueous solution of effect and its preparation method and application method |
| CN110317598B (en) * | 2018-03-30 | 2021-09-14 | 中国石油化工股份有限公司 | Enhancement of compact reservoir CO2Flooding effect aqueous solution and preparation method and application method thereof |
| CN112983367A (en) * | 2021-03-15 | 2021-06-18 | 西北大学 | Application of toxoplasma bacteria in evaluation of microbial oil displacement field test effect and method thereof |
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