Treatment method of fracturing flowback fluid and treated fracturing flowback fluid and its application

Abstract

The invention discloses a flown back fracturing fluid treatment method, a flown back fracturing fluid obtained after treatment, and an application of the flown back fracturing fluid. The flown back fracturing fluid treatment method comprises the following steps: 1, adjusting the pH value of a flown back fracturing fluid to be treated to 9.8-11.5; 2, adding a flocculating agent to the flown back fracturing fluid, and carrying out flocculation settlement treatment; 3, carrying out ultraviolet sterilization treatment on the flocculation and settlement treated flown back fracturing fluid; and 4, adding a water quality stabilizer to the ultraviolet sterilized flown back fracturing fluid. The invention also discloses the flown back fracturing fluid obtained after treatment using the method, and the application of the flown back fracturing fluid. The treatment method has the advantages of effective preservation of useful components of the flown back fracturing fluid, prolongation of the preservation time of the treated flown back fracturing fluid, low treatment cost and good treatment effect, and the treated flown back fracturing fluid can be effectively recycled, and can greatly saves the dosage of a drag reducer when used in fracturing of water for fluid preparation.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a treatment method for fracturing flowback fluid, the treated fracturing flowback fluid and applications thereof. Background technique [0002] With the development of the world economy, the demand for energy in countries around the world is increasing, while the conventional oil and gas resources are increasingly depleted. In recent years, the development of unconventional oil and gas resources represented by shale oil and gas has made great progress, and has become The new growth point of supply. [0003] The development of unconventional oil and gas resources such as shale gas usually requires the use of multi-stage staged fracturing technology for large horizontal wells, thus requiring the use of a large amount of fracturing fluid. The existing fracturing fluids are mainly divided into water-based fracturing fluids, oil-based fracturing fluids, and foam fracturing fluids....

AI Technical Summary

Problems solved by technology

However, in the treatment and reuse process of the fracturing flowback fluid of this conventional slick water system, the fracturing flowback fluid needs to be reused immediately after treatment, otherwise the water will become smelly after a few days of storage, making it impossible to reuse. At the same time, this method also has the problems of large loss of useful components of fracturing flowback fluid and waste of resources during the treatment process.