Crude oil pre-dehydration, deep dehydration and sewage oil removal integrated device and method

Abstract

The invention aims to provide a crude oil pre-dehydration, deep dehydration and sewage oil removal integrated device and method. On the premise that the process is simplified, chemicals are reduced and VOCs volatilization is prevented, efficient deep dehydration of crude oil produced liquid and immediate oil removal of removed sewage are achieved. The device comprises a pre-dehydrator, a deep dehydration tank and a sewage oil remover, and the pre-dehydrator, the deep dehydration tank and the sewage oil remover are connected into one process flow in a closed mode through pipelines. The pre-dehydrator is a rotational flow dehydrator and is used for receiving a crude oil produced liquid from an oil field and carrying out oil-water pre-separation on the produced liquid. The sewage dehydrationtank is an electric dehydrator and is used for coalescing and settling under the action of an electric field to realize deep dehydration of an oil phase. The sewage oil remover is a cyclone degreaserand is used for separating the residual oil phase in sewage by a water phase under the action of cyclone after degreasing so as to realize sewage degreasing.

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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