Method for reducing CO2-crude oil minimum miscible pressure and CO2 oil displacement method
A technology of miscible pressure and oil displacement method, which is applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve the problems of large adsorption loss of surfactants, difficult injection, low efficiency, etc., and reduce the minimum miscible pressure. , the effect of improving the recovery rate and good technical effect
Active Publication Date: 2021-01-15
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0008] One of the technical problems to be solved by the present invention is that existing methods for reducing CO 2 Chemical agents with the minimum miscible pressure with crude oil, such as liquefied petroleum gas, low-carbon alcohol, etc., have a large amount of consumption, low efficiency, large adsorption loss of surfactants, and difficulty in injecting into low-permeability and ultra-low-permeability reservoirs. 2 - Crude oil minimum miscibility pressure method, using CO 2 , crude oil amphiphilic chemical agent, efficiently promote CO 2 Achieve miscibility with crude oil, reduce the minimum miscibility pressure of the two
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Embodiment 1
[0031] Reduce the components and content of the minimum miscible pressure chemical agent:
[0032] Surfactant A (R 1 =-C 16 h 33 ; 2 =-CH 3 ; 3 =-CH 3 ; 4 =-CH 3 ; 5 =-CH 3 ): 100;
[0033] Use concentration: 1.0% (chemical agent in CO 2 mass concentration in);
[0034] Crude oil: provided by Shengli Oilfield.
Embodiment 2
[0036] Components and contents of miscible pressure chemicals:
[0037] Surfactant A (R 1 =-C 16 h 33 ; 2 =-CH 3 ; 3 =-CH 3 ; 4 =-CH 3 ; 5 =-CH 3 ):100;
[0038] Use concentration: 1.5% (chemical agent in CO 2 mass concentration in);
[0039] Crude oil: provided by Shengli Oilfield.
Embodiment 3
[0041] Components and contents of miscible pressure chemicals:
[0042] Surfactant B (R 1 =-C 12 h 25 ; 2 =-CH 3 ; 3 =-CH 3 ; 4 =-CH 3 ; 5 =-CH 3 ):100;
[0043] Use concentration: 1.0% (chemical agent in CO 2 mass concentration in);
[0044] Crude oil: provided by Shengli Oilfield.
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The invention relates to a method for reducing CO2-crude oil minimum miscible pressure and a CO2 oil displacement method. The problems of high minimum miscible pressure and low oil displacement efficiency of CO2 immiscible displacement are mainly solved. A guanidyl surfactant is used as a chemical agent for reducing the minimum miscible pressure. Neutral alkyl guanidine is dissolved in CO2 to be injected into an oil reservoir together, the alkyl guanidine reacts with CO2 and formation water under the formation condition to generate an alkyl guanidine bicarbonate surfactant in situ, the interfacial tension between CO2 and crude oil is reduced, and the CO2 and crude oil miscible effect is promoted. According to the technical schemes of the method for reducing the CO2-crude oil minimum miscible pressure and the CO2 oil displacement method, the minimum miscible pressure of CO2 and the crude oil is effectively reduced, the oil displacement recovery ratio is increased, the adsorption loss inthe injection process is greatly reduced, the problem is well solved, and the methods can be used for CO2 oil displacement of low-permeability and ultra-low-permeability oil reservoirs.
Description
technical field [0001] The invention relates to a method for reducing CO 2 -Crude oil minimum miscible pressure method and CO 2 Oil flooding method. Background technique [0002] As low-permeability oil and gas fields account for an increasing proportion of newly proven oil and gas reserves, how to improve the recovery of low-permeability oil and gas reservoirs will become a new direction for oil and gas research and development in China and the world. Gas drive technology (such as natural gas, CO 2 , N 2 , air, etc.) is currently one of the most suitable methods for developing low-permeability reservoirs. CO 2 It reaches a supercritical state when the temperature is higher than 31.26°C and the pressure is higher than 7.2MPa. Supercritical CO 2 It has good solubility to crude oil and is an ideal displacement medium. [0003] CO 2 Flooding is divided into miscible flooding and immiscible flooding. Miscible flooding refers to the CO 2 Diffusion and mass transfer wit...
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IPC IPC(8): E21B43/22
CPCE21B43/164Y02P20/54
Inventor 吴春芳沈之芹李斌吴国英
Owner CHINA PETROLEUM & CHEM CORP
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