Integrated treatment method of chemical flooding produced emulsion

Abstract

The invention relates to an integrated treatment method of a chemical flooding produced emulsion. The crude oil treatment flow and the sewage treatment process are integrated to optimize oil and water treatment equipment, an adaptive comprehensive treatment agent and a functional treatment agent are selected, a dosing position is reasonably laid, and the chemical flooding emulsion is transferred and treated in the oil and water integrated treatment flow, so that the water content of transported crude oil reaches 0.6%, the oil content of transported sewage is 9.3mg / L, the suspended solid content is 8.0mg / L, the polymer content is 242mg / L, and the retention rate of polymer-bearing sewage polymer is more than 95%, and thereby avoiding the generation of aging oil and polymer-bearing sludge.

Description

technical field [0001] The invention relates to the technical field of oil-water treatment on the surface of an oil field, in particular to an integrated treatment method for chemical flooding and production of emulsion. Background technique [0002] As the oilfield enters the later stage of development, in order to stabilize crude oil production, the main oilfields in the east have promoted and applied tertiary oil recovery technology on a large scale. Here comes the difficulty. In the mine field, the viscosity of the produced fluid increases, and the oil-water separation of the produced crude oil emulsion becomes more difficult; the "intermediate layer" of crude oil appears in the settling tank of the oil station, the dehydration temperature increases, and the thermogravity settling time prolongs. The energy consumption of the oilfield ground gathering and transportation system is increased, the efficiency of thermal gravity sedimentation is reduced, the efficiency of the...

AI Technical Summary

Problems solved by technology

Increased energy consumption for the oil field surface gathering and transportation system, reduced efficiency of thermogravity settling, poor dehydration process efficiency, power frequency electric dehydrator cannot operate normally, and increased circulation of aging oil

The oil content in the separated sewage increases; the content of suspended solids and impurities increases; the effect of gravity sedimentation to remove oil is poor; after flocculation and purification treatment, it is easy to produce aged oil and oily sludge; the produced oily sludge causes waste of petroleum resources and environmental pollution And other issues

[0003] Through the study of the behavior of the interface behavior of complex emulsions in chemical flooding, it is found that due to the injection of various types of chemical flooding agents, the produced fluid emulsifies seriously, the emulsification state is stable, and the emulsification properties are complex

The degraded oil displacement agent in the produced fluid changes the physical and chemical properties of the chemical flooding sewage, and the existing technology in the mine is difficult to adapt to the changes in the characteristics of emulsified crude oil and chemical flooding sewage

Under the working conditions of the mine, the dosage of treatment chemicals is large, the treatment cost is high, and the treatment index is poor, so it is difficult to meet the standards for crude oil transportation and sewage geological injection and aggregation

Substandard sewage dilutes the polymer mother liquor, the cations in the sewage interact with the polymer, and the viscosity of the polymer is low, resulting in a decrease in the efficiency of the polymer injection project

Images