Method for improving recovery ratio of crude oil

By using a surfactant composition of quaternary ammonium salts and amine-containing polyethers, the problems of emulsification and solubilization ability and adsorption retention capacity of existing oil-displacing agents under high-temperature and high-salt conditions have been solved, and efficient crude oil displacement effects have been achieved. .

CN112226224AActive Publication Date: 2021-01-15CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
CN201910633108.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2019-07-15
Publication Date
2021-01-15
Estimated Expiration
2039-07-15

AI Technical Summary

Technical Problem

The oil displacing agent system in the prior art has poor surfactant ability to emulsify and expand crude oil, low oil displacement efficiency, poor temperature and salt resistance, and large adsorption retention capacity, which cannot meet the needs of oil displacement in high-temperature and high-salt reservoirs. .

Method used

A new surfactant composition for oil displacement is used, including quaternary ammonium salt surfactant and amine-containing polyether surfactant. Through a specific molecular structure and composition ratio, it has high emulsification and solubilization ability and temperature resistance. An oil displacing agent with good salt resistance and low adsorption retention capacity.

Benefits of technology

It significantly improves the oil displacement efficiency of crude oil, enhances the emulsification and solubilization ability of crude oil, reduces the oil-water interfacial tension, and improves the recovery rate and economy of the oil displacement agent.

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Abstract

The invention relates to a method for improving the recovery ratio of crude oil. The method mainly solves the problems that an existing surfactant is low in interface efficiency, poor in crude oil emulsifying and solubilizing capacity and large in adsorption retention amount and cannot meet the oil displacement requirements of a high-temperature high-salt oil reservoir. The method for improving the recovery ratio of crude oil comprises the following steps: 1) mixing an oil displacement agent with water to obtain an oil displacement system; and 2) enabling the oil displacement system to be in contact with an oil-bearing stratum so as to displace crude oil in the oil-bearing stratum. The oil displacement agent comprises the following components in parts by mass: 1) 1 part of a surfactant composition, and 2) 0-20 parts of a polymer, wherein the part of the polymer is more than 0. The surfactant composition comprises the following components in parts by mole: 1) 1 part of a quaternary ammonium salt surfactant, and 2) 0.1-30 parts of a surfactant containing amino polyether. With the above technical scheme, the above problems are well solved, and the method can be used in oil field production for increasing crude oil yield.
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