Oil displacing method for reservoirs with high temperature and salinity

A high-temperature, high-salt, oil-displacing technology, applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve the problem of alkali corrosion, high use concentration, and poor oil-displacing efficiency in ASP flooding problems, to achieve the effect of reducing interfacial tension capacity, high salinity resistance, and excellent performance
CN102220119AActive Publication Date: 2011-10-19CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2011-10-19

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Abstract

The invention relates to an oil displacing method for reservoirs with high temperature and salinity, and mainly solves the problems that the oil displacing agent containing a surfactant in the prior art has poor displacement efficiency, high use concentration and corrosion and scale damage caused by bases in ASP (alkali surfactant polymer ) flooding to the formation and oil wells under the conditions of high temperature and salinity. Through the oil displacing method for reservoirs with high temperature and salinity provided by the invention, the crude oil in cores is fully displaced by contacting the underground dehydrated crude oil with a oil displacing composition under the formation water conditions of the oil displacing temperature greater than or equal to 85 DEG C, the total mineralization degree greater than or equal to 16000 mg / L and the total content of Ca<2+> and Mg<2+> greater than or equal to 450 mg / L, wherein the oil displacing composition comprises the following components in percentage by weight: (1) 0.01-5.0% of N,N-bisfatty acyl-diamine-dipropionate-dipolyoxyethylene ether dicarboxylate; (2) 0.01-3.0% a polymer; and (3) 92.0-99.98% of the formation water. The oil displacing method provided by the invention can solve the above problems in a better manner and can be used in tertiary oil recovery production of an oilfield.
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Description

technical field

[0001] The invention relates to an oil displacement method for high-temperature and high-salt oil reservoirs. Background technique

[0002] With the development of society and economy, people's demand for oil continues to increase and oil reserves decrease, and oil, as a non-renewable resource, is becoming more and more valuable. The problems we are facing are: first, the contradiction between supply and demand is prominent, the demand for oil is getting bigger and bigger, and new oil fields are getting fewer and fewer; second, there is still a large amount of crude oil left in the depleted oil reservoirs. Primary oil recovery (POR) can produce 10-25% of underground crude oil, and secondary oil recovery (SOR) can recover 15-25% of underground crude oil, that is, primary oil recovery and secondary oil recovery only produce 25-50% of underground crude oil. In order to ensure the long-term stable supply of oil and meet the needs of human beings, it is necessary...

Claims

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