Advanced treatment method of fracturing flow-back fluid for shale gas exploitation

Abstract

The invention belongs to the technical field of fracturing flow-back fluid treatment, and discloses an advanced treatment method of fracturing flow-back fluid for shale gas exploitation. The advancedtreatment system comprises a video monitoring module, a parameter monitoring module, a main control module, a pretreatment module, an electrochemical oxidation treatment module, a precipitation and filtration module, an evaporation and concentration module, an analysis module, a power supply module and a display module. Parameters such as the fracturing flow-back fluid amount of each layer sectionand the proportion of fracturing fluid to stratum water in the fracturing flow-back fluid of each layer section can be directly measured and calculated through the parameter monitoring module, and the fracturing flow-back fluid profile of each layer section can also be obtained; the judged fracturing condition is visual and accurate, quantitative analysis can be carried out, errors are small, andan important guiding effect on fracturing work of same layer sections is achieved; meanwhile, whether the fracturing flow-back fluid is suitable for preparing fracturing fluid or not is judged through the analysis module according to the detected index value and other index values determined according to the detected index value; the time is saved, and the analysis efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of fracturing flowback fluid treatment, and in particular relates to an advanced treatment method for fracturing flowback fluid in shale gas exploitation. Background technique [0002] Shale gas is natural gas that occurs in shale formations, which belongs to unconventional natural gas, and is mainly exploited by hydraulic fracturing. Hydraulic fracturing is a mining method that uses high pressure to drive fracturing fluid into the ground to hydraulically break the formation, thereby releasing the oil or natural gas reserves therein. After the hydraulic fracturing operation is completed, part of the liquid will be drained back to the ground, and the liquid that is drained back to the ground is called fracturing flowback fluid. The fracturing of a single shale gas well often consumes 20,000m3 of water 3 Above, 10%-50% flowback before completion of the well, and flowback at ten to dozens of cubic meters per ...

AI Technical Summary

Problems solved by technology

[0005] (1) The recovery of fracturing flowback fluid in shale gas exploitation is affected, resulting in difficulty in recovery; the process of shale gas fracturing flowback fluid treatment and reuse has little connection with water quality, and cannot meet the water quality requirements, and the recovery efficiency is low. poor effect

[0006] (2) The current treatment processes for various fracturing flowback fluids are characterized by high equipment investment, cumbersome process steps, long treatment cycle, and high operating costs, resulting in unsatisfactory treatment effects

It is difficult to make the treated water meet the national first-level discharge standards in a short period of time

Images