Recovery processing process for fracturing return liquid

Abstract

The invention relates to a process for reclaiming and treating fracturing backflow fluid. The process comprises the following steps: a, feeding the fracturing backflow fluid into a dirty oil reclaiming pool, and reclaiming dirty oil; b, after natural degradation, adding gel breaker active polyaluminium chloride into sewage, and pumping the sewage into an electric flocculator; c, further breaking gel and emulsion in the sewage through the electric flocculator; and d, after electric flocculation treatment, feeding water purifying agent nano-scale clay and flocculating agent polyaluminium chloride into the sewage, adding coagulant aid polyacrylamide after the sewage is pumped by the pump, feeding the sewage into a suspended silt filter and then conveying the sewage into an oilfield sewage treatment station to be treated and recycled. The process for treating the fracturing backflow fluid has the advantages of low cost, safe production and stable treating effect, and is not limited by environmental conditions.

Description

Technical field:

[0001] The invention relates to a process for recovering and treating fracturing flowback fluid in the field of oil recovery. Background technique:

[0002] Usually, the fracturing flowback fluid is simply separated and recovered for oil components, and the wastewater is discharged on site or stored in a centralized manner. At present, advanced treatment includes electrochemical treatment method and biological treatment method. The difficulty of using advanced treatment to reach the standard discharge is to reduce COD. Among them, the electrochemical treatment method requires a large amount of dosing, requires high cost of micro-electrolysis, and most of the cost is consumed in reducing COD. , requires the use of strong acid, strong alkali and other regulators, which is not conducive to safe production, and its treatment effect is also unstable; biological treatment requires a suitable ambient temperature, and the degradation time is long. It is still in the...