Demulsifier for efficient oil-water separation of crude oil with high clay content in offshore oilfields

Abstract

The invention relates to an emulsion breaker for oil-water separation by efficiently treating crude oil with high clay component content on the offshore oil field, belonging to the technical field of oil-water separation of oilfield exploitation. The emulsion breaker for oil-water separation by efficiently treating crude oil with high clay component content on the offshore oil field is characterized by consisting of the following components in percentage by weight: 35%-45% of ethanediamine polyoxypropylene polyoxyethylene ether, 0.2%-0.6% of hexadecyl sodium sulfonate, 0.3%-1.0% of a quaternary ammonium cation fluorocarbon surfactant, 15%-20% of methanol, 8.5%-12% of 6-chlorobenzotriazole-1,1,3,3-tetramethyluronium hexafluorophosphate and the balance of water. The emulsion breaker disclosed by the invention has the advantages of being simple in components, convenient in preparation, quick and efficient, low in cost, strong in pertinence, high in oil-water separation efficiency, small in usage amount, and the like.

Description

technical field [0001] The invention belongs to the technical field of oil-water separation in oilfield exploitation, and in particular relates to a demulsifier for efficient oil-water separation of crude oil with high clay content in offshore oilfields. Background technique [0002] At present, when crude oil is exploited in offshore oilfields and enters the later stage of exploitation, as the water content continues to increase, it becomes turbid like mud, and the clay content reaches about 5%. Because the clay has a small particle size and a large surface area, the adsorption capacity is very high. Strong, in the formation crude oil reservoir, with the stirring of the oil production pump during the production process, a layer of crude oil will be wrapped on the surface of the particles, and then a new emulsification system will be formed, which is called "oil mineral aggregates" (oil mineral aggregates, OMA). When the emulsification system of this structure enters the cr...

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Problems solved by technology

[0004] The solution to this problem is to use a flocculant with enhanced polarity to efficiently flocculate the produced liquid or the sewage at the outlet of the separator. Commonly used flocculants such as polyaluminum and polyacrylamide cannot achieve the desired effect, and sometimes a large amount of "Greasy sludge" will lead to "overload" of the subsequent treatment unit, the clay content can only be reduced by about 10%, and there are technical problems such as the sewage is still high in oil

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