An integrated device and method for crude oil pre-dehydration, deep dehydration and sewage oil removal

Abstract

The purpose of the present invention is to provide an integrated device and method for crude oil pre-dehydration, deep dehydration and sewage degreasing, which can realize high-efficiency deep dehydration and dehydration of crude oil production liquid under the premise of simplifying the process, reducing dosing, and preventing the volatilization of VOCs. Instant degreasing of the removed sewage, the device includes a pre-dehydrator, a deep dehydration tank, and a sewage degreaser, which are closed in a process flow through pipelines; the pre-dehydrator adopts a cyclone dehydrator, which receives The crude oil produced liquid from the oil field, and the produced liquid is pre-separated from oil and water. The sewage dehydration tank is an electric dehydrator, which coalesces and settles under the action of an electric field to achieve deep dehydration of the oil phase. The sewage degreaser is a cyclone. The oil separator is used to separate the oil phase remaining in the sewage from the water phase after deoiling under the action of swirling flow, so as to realize the oil removal of the sewage.

Description

technical field [0001] The invention relates to the technical field of crude oil dehydration and sewage degreasing equipment, in particular to an integrated device and method for crude oil pre-dehydration, deep dehydration and sewage degreasing. Background technique [0002] As the development of oilfields enters the middle and later stages, the water content and sediment content of oilfield production fluids are getting higher and higher, the physical properties of production fluids are becoming more and more complex, and the problem of emulsification and aging is serious. The emulsion has complex shapes and strong stability, and oil-water separation is difficult. . [0003] At present, the dehydration of oilfield produced fluid generally adopts thermochemical sedimentation dehydration (heating, adding demulsifier, gravity sedimentation) technology, and the typical equipment commonly used is three-phase separator and settling tank. The factors affecting the dehydration eff...

AI Technical Summary

Problems solved by technology

Comprehensive analysis of the production fluid treatment process of each oilfield shows the following outstanding problems: (1) The long dehydration time makes the ground construction capacity insufficient; (2) The large amount of chemicals is used, and the dehydration effect is poor; (3) The process is not airtight, and VOCs volatilize , causing air pollution; (4) Heating is required, and the heat loss is large; (5) The sewage is oily, and the post-processing is difficult; (6) A large amount of chemicals are added, and the oil-water separation is not complete, resulting in a large amount of oily sludge

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