Biological wetting reversal agent for high-temperature high-salt heavy oil reservoir, and preparation method thereof

Abstract

The invention relates to a biological wetting reversal agent, and concretely relates to a biological wetting reversal agent for a high-temperature high-salt heavy oil reservoir, and a preparation method thereof. The reversal agent comprises 20-30 wt% of a rhamnolipid fermentation liquor, 15-20 wt% of a sophorolipid fermentation liquor, 3-5 wt% of alkyl polyglycoside, 0.1-0.3 wt% of an alcohol assistant, and the balance of water. The rhamnolipid fermentation liquor is a Pseudomonas aeruginosa fermentation liquor with the concentration of above 35 g / L; the sophorolipid fermentation liquor is a yeast fermentation liquor with the concentration of above 100 g / L; the alkyl polyglycoside is a biological anionic and nonionic surfactant, and the relative molecular weight is 290-370; and the alcoholassistant is one of butanol, pentanol and hexanol. The biological wetting reversal agent has the advantages of wide oil reservoir application range, simple construction process and good field test effect, has a validity period of above 24 months, and allows the daily oil increase of a single well to be more than 10 t and the input-output ratio to be larger than 1:10.

Description

technical field [0001] The invention relates to a biological wetting reversal agent, in particular to a biological wetting reversal agent for high-temperature, high-salt heavy oil reservoirs and a preparation method thereof. Background technique [0002] High-temperature and high-salt reservoirs are a type of unconventional and harsh-condition reservoirs with a reservoir temperature exceeding 80°C and a salinity greater than 30,000 mg / L. This type of reservoir is rich in resources and has great potential value. As the development progresses, these high-temperature and high-salt main blocks gradually enter the stage of high water content development, approaching the economic limit. At this time, in order to improve the development efficiency, it is necessary to adopt the necessary enhanced oil recovery technology to achieve the purpose of increasing production. Single well huff and puff is one of the economical, fast and effective methods, mainly including two processes of t...

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Problems solved by technology

[0007] The present invention provides a biological wetting reversal agent for the problem of poor temperature and salt resistance existing in the application of existing wetting agents in high-temperature, high-salt heavy oil reservoirs. The reversal agent includes rhamnolipid fermentation liquid, sophora Glycolipid fermentation broth, alkyl polyglycoside (APG) and alcohol additives, all of which have good temperature and salt resistance, are injected into high-temperature and high-salt oil reservoirs to act on the surface of lipophilic rocks to achieve wettability. Inversion, greatly reducing the flow resistance of heavy oil and improving the development efficiency of water flooding

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