Water-based fracturing flow-back fluid resource utilization method

Abstract

The invention relates to a water-based fracturing flow-back fluid resource utilization method, and belongs to the technical field of water-based fracturing flow-back fluid recycling treatment. The method comprises the following steps: carrying out gel breaking viscosity reduction, air floatation oil removal, flocculation-sedimentation-filtration treatment on the water-based fracturing flow-back fluid to obtain treated water, detecting the treated water, and adding a unified clean fracturing fluid to prepare the clean fracturing fluid without adding a cross-linking agent and an assistant. The resource utilization method is simple in process and is mature in the process of the treatment unit; the treated water can be used for preparing clean fracturing fluid, water resources in the fracturing flow-back fluid are effectively utilized; meanwhile, the agent dosage is small, the cost is low, the treatment operation is simple, resource utilization of the fracturing flow-back fluid is achieved, and remarkable economic benefits are achieved.

Description

technical field [0001] The invention relates to a treatment process for oil field operation waste fluid, in particular to a resource utilization method for water-based fracturing flowback fluid. Background technique [0002] Fracturing refers to a method of using a certain force to form cracks in oil and gas layers during the process of oil or gas production. Fracturing fluid is an aqueous solution mainly composed of thickeners, demulsifiers, drainage aids, clay stabilizers, crosslinking agents and other additives. Among them, the thickener (mainly hydroxypropyl guar gum) and the crosslinking agent (inorganic boron, organic boron) in the fracturing fluid form a jelly. During work, the fracturing fluid carries the proppant into the fracturing fracture, and then the fracturing fluid degrades under the action of the gel breaker to form a low-viscosity liquid that is flowed back into the formation to obtain the fracturing flowback fluid. The composition of fracturing flowback ...

AI Technical Summary

Problems solved by technology

[0005] However, in the prior art, in the resource utilization process of fracturing flowback fluid after treatment, chemical oxidants are often used on site. In the on-site flowback fluid treatment operation, there is a slight inappropriateness, and the excess oxidant components left behind will make the treated The fracturing fluid made of water is difficult to viscous, so that it is impossible to prepare a fracturing fluid that meets the requirements of on-site construction technology

For unconventional oil and gas reservoir wells used in different fracturing intervals of the mixed flowback fluid of polymer linear gel and jelly fracturing fluid, it is necessary to set up ion removal process to remove harmful ions in the flowback fluid. Complex reuse process

At the same time, most of the reuse treatment processes do not clearly indicate which type of fracturing fluid can be prepared with the treated water