Swill oil emulsion flooding system

A technology of emulsion and waste oil, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of unsatisfactory oil recovery rate, unsatisfactory deep profile control and displacement effect, high preparation cost, etc., and achieve Achieve selective plugging, reduce tension, and increase oil displacement efficiency
CN107779186AInactive Publication Date: 2018-03-09ZHEJIANG OCEAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG OCEAN UNIV
Publication Date
2018-03-09
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

The invention discloses a microemulsion flooding system prepared by taking swill oil as a raw material. The flooding system is prepared from swill oil pretreatment fluid, and anionic, non-ionic or composite surface active agent of which HLB value is less than 6. The microemulsion flooding system has the beneficial effects that the raw materials are emulsified to form oil-coating-water type emulsion, and its emulsion droplet size is designed according to the hole size of the injection oil deposit. The generally designed droplet size is more than that of a pore throat, thus the emulsion can effectively block the pore throat and generate a Jamin effect, thus the subsequent fluid is changed, and the volume is further enlarged. Meanwhile, it is the oil-coating-water type emulsion, the emulsiongenerates big flow resistance in the face with water, and has small flow resistance change in the face with oil, thus the microemulsion flooding system plays the effects of selective water blocking and flooding since only water is blocked. Therefore, the flooding system can selectively block water and recycle the swill oil.
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Description

technical field

[0001] The invention relates to the field of oil and gas exploitation, in particular to the regulation and flooding of waste oil emulsion. Background technique

[0002] Swill oil, commonly known as gutter oil, is a variety of low-quality oils produced in human life. After high-temperature cooking, a variety of carcinogens have been formed and can no longer be eaten. But because it is neither edible, it is a pity to discard it. If it is converted into an industrially usable substance, it can not only turn waste into wealth, but also prevent it from flowing back into the catering industry.

[0003] At the same time, in the development of oilfields by water injection, water output from oil wells is a common problem, and channeling of injected fluids is a problem that needs to be solved. It is very necessary to timely and accurately find out the aquifer and the direction of water production, and take measures of profile control and water shutoff. At present, t...

Claims

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