A process for reuse of treated guar gum fracturing flowback fluid after water treatment

Abstract

The invention provides a guar gum fracturing flow-back fluid water treatment and reuse technology. The technology comprises the following steps: allowing a flow-back fluid to go through a solid-liquid separation device, allowing the obtained fluid to enter an oil-water separation device, allowing the obtained product to enter a recovery device, and uniformly reclaimed; allowing the obtained flow-back fluid to enter an oxidation pool from the recovery device, adding an oxidant, oxidizing, adding a flocculating agent to the oxidized fracturing flow-back fluid to carry out flocculation precipitation, precipitating, allowing the precipitated fracturing flow-back fluid to enter an air floatation device, allowing the back-flow fluid to be discharged from the air flotation device and to enter a chemical precipitation pool, adding an ammonium persulfate removal agent, adjusting the pH value, precipitating persulfate radicals and magnesium ions in the flow-back fluid through a chemical reaction, and separating the obtained precipitate through a filtering device. The fracturing flow-back fluid treatment technology has the advantages of simple process, water resource saving, cost saving, high COD removal rate, and reuse of a prepared fracturing fluid, and the prepared fracturing fluid has high temperature shearing resistance and has no influences on the fracturing construction effect.

Description

technical field [0001] The invention belongs to the technical field of oil and gas well fracturing flowback liquid water treatment, and in particular relates to a process for reusing guar gum fracturing flowback liquid water after treatment. Background technique [0002] Hydraulic fracturing technology is recognized as the most effective oil and gas well stimulation measure, and is currently widely used at home and abroad. After the fracturing operation is completed, the fracturing fluid is flowed back to the ground through the oil pipe or casing, because a large amount of thickener, crosslinking agent, gel breaker, drainage aid and anti-swelling agent are added to the fracturing fluid. Various chemical additives, so the ionic components in the flowback liquid are complex, accompanied by a large amount of suspended solids and organic matter, direct discharge will bring certain environmental pollution. For areas where water resources are scarce, direct discharge also wastes ...

AI Technical Summary

Problems solved by technology

There is no oxidant treatment unit in the patent, and the ordinary guar gum flowback fluid cannot meet various performance indicators of the fracturing fluid after treatment. At the same time, the multi-stage catalytic oxidation and electrocoagulation process is processed, and the treatment cost is relatively high

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