Papermaking black liquor modified oil displacement agent

Abstract

The invention relates paper making black liquor modified oil displacement agent, comprising 1.5%-2.0% by mass paper making black liquor, 0.5%-1.0% sodium dodecylbenzene sulfonate, 0.2%-0.5% solid NaOH and water. The invention compounds the paper making black liquor, sodium dodecylbenzene sulfonate and alkali to get compounded system. The compounded system not only reduces the cost of oil displacement agent, but also changes the black liquor into the treasure. The paper making black liquor which is filtered can be used to viscous oil recovery.

Description

technical field [0001] The invention relates to an oil-displacing agent, in particular to a paper-making black liquor modified oil-displacing agent. Background technique [0002] Most oil fields in my country are in the late stage of secondary oil recovery. After primary and secondary oil recovery, the comprehensive crude oil recovery rate is only a little over 30%, and more than 60% of the oil is still unrecoverable. Therefore, the need for tertiary oil recovery and enhanced oil recovery is a strategic requirement to slow down the aging speed of most oil fields in my country, maintain stable crude oil production in China, and reduce my country's dependence on foreign crude oil. The oil displacement agent is mainly used for tertiary oil recovery to increase recovery by improving oil washing efficiency. In the tertiary oil recovery process, the oil-displacement agent prepared by polyacrylamide (PAM) or its modified polymer is mainly used at present. However, the oil-displace...

AI Technical Summary

Problems solved by technology

In the tertiary oil recovery process, the oil-displacement agent prepared by polyacrylamide (PAM) or its modified polymer is mainly used at present. However, the oil-displacement agent has poor temperature resistance, salt resistance, and shear resistance. Because of its high cost, the tertiary oil recovery basically has no economic benefits; there are also non-ionic surfactants, but they are not resistant to high temperatures, and the use effect decreases rapidly above the cloud point; there are also water-displacing agents, although relatively Cheap, but the use effect is quite poor, and it will consume a lot of water, causing a waste of water resources