Fracturing fluid prepared by utilizing fracturing flow-back fluid and preparation method thereof

Abstract

The invention provides a fracturing fluid prepared by utilizing a fracturing flow-back fluid and a preparation method thereof. The fracturing flow-back fluid is not processed or subjected to simple processing and then is directly used to prepare the fracturing fluid. The fracturing fluid is composed of a thickening agent and other auxiliary agents, and employs a crosslinking agent compatible with a guar gum thickening agent used for the flow-back fluid and a crosslinking promoter. The formula crosslinking time 1-3 min is adjustable, the temperature resistance is 120 DEG C or more, and the system frictional resistance is reduced by 20% or more compared with a common hydroxypropyl guar gum fracturing liquid. The fracturing liquid preparation method realizes cyclic utilization of the fracturing flow-back fluid, and the prepared fracturing liquid possesses good performances.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry, and relates to a fracturing fluid prepared by using fracturing flowback fluid and a preparation method thereof. Background technique [0002] Fracturing technology is an important means for the effective development of low-permeability oil and gas fields. With the application of factory operations and volumetric fracturing technology, the amount of fracturing fluid is increasing, and more and more fracturing flowback fluid is produced. The environmental pollution caused by fracturing fluid flowback has attracted more and more attention. [0003] Fracturing flowback fluid refers to the residual fracturing fluid discharged from oil and gas wells after fracturing construction, mainly including fracturing raw gel fluid and gel-breaking flowback fluid, which has complex components and many types of chemical agents, mainly containing thickeners , borate cross-linking agents, surfactants, pe...

AI Technical Summary

Problems solved by technology

If this kind of sewage is discharged directly without treatment, it will cause serious pollution to the surrounding environment, especially to crops and surface water systems; if the fracturing flowback fluid enters the sewage treatment system directly, the treatment effect will be poor, and the water quality will not meet the standard for return. Note, it may even cause system paralysis and seriously affect the safe operation of the production system

[0004] Conventional fracturing flowback fluid treatment methods include flocculation and precipitation methods, biochemical methods, advanced oxidation technology, and micro-electrolysis combined process, etc. These flowback fluid treatment methods or processes generally have a large amount of chemicals, high treatment costs, and large equipment investment. Defects such as complex process or inconvenient operation

At present, there is no flowback liquid process technology that does not treat or is directly recycled after simple treatment. The present invention aims to provide the technology and method

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