Method for improving ordinary heavy oil reservoir recovery ratio by adopting chemical agents to assist CO2 huff and puff
A technology of heavy oil reservoirs and chemical agents, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., and can solve the problems of periodic oil production, oil-gas ratio decline, large difference in oil-gas velocity, and small swept volume, etc. problems, to achieve the effect of reducing the flow resistance of crude oil, reducing the viscosity of crude oil, and reducing the flow resistance of heavy oil
Active Publication Date: 2016-09-21
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Abstract
The invention relates to a method for improving the ordinary heavy oil reservoir recovery ratio by adopting chemical agents to assist CO2 huff and puff. The method is characterized by combining the chemical agents with CO2 huff and puff, firstly injecting a viscosity reducer or foaming agent type chemical agent solution slug into an oil well undergoing multiple rounds of CO2 huff and puff, later injecting a high pressure CO2 slug into the well and carrying out soaking after injection is completed. The method has the advantages that during soaking, the viscosity reducer type chemical agents and the ordinary heavy oil form oil-in-water type emulsion, thus substantially reducing the oil-water interfacial tension and reducing the crude oil flow resistance during exploitation; the CO2 gas phase mobility can be controlled and CO2 can be effectively prevented from gas channeling through addition of the foaming agent type chemical agents, so that CO2 diffuses toward the depth of the stratum and the CO2 wave and volume are increased; and due to synergy of the chemical agents and CO2, the oil well can still maintain higher oil production after multiple rounds of huff and puff.
Application Domain
Fluid removal
Technology Topic
Oil productionEnvironmental geology +11
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