Low temperature gel breaking system and preparation method thereof

Abstract

The invention discloses a low temperature gel breaking system and a preparation method thereof. The low temperature gel breaking system is prepared sequentially adding 0.3-0.5 mass% of ammonium persulfate, 0.05-0.1 mass% of ferrous sulfate and 0.15-0.25 mass% of ethylenediamine to water, and performing mixing and uniform stirring, wherein the mass percentage sum of above added substances and the water is 100%. The low temperature gel breaking system has the characteristics of small dosage and controllable gel breaking time. The preparation method has the advantages of simplicity, low cost, meeting of the requirement of compounding in the field when in use, and excellent promotion and application prospects.

Description

technical field [0001] The invention relates to the technical field of low-temperature gel breaking for fracturing fluids, in particular to a low-temperature gel breaking system and a preparation method thereof. Background technique [0002] In the fracturing process, fracturing fluid gel breaking and flowback is a key link to determine the success of fracturing. A lot of research has been done on fracturing fluid gel breakers at home and abroad. However, at low temperatures (25-50°C) Gel-breaking technology still has problems such as incomplete gel-breaking and flowback, great damage to formations, etc. Therefore, low-temperature gel-breaking of fracturing fluids has always been a technical problem in this field. [0003] At present, conventional gel breaking agents such as ammonium persulfate and potassium persulfate have good gel breaking effects when the temperature is higher than 50°C, but when the temperature is lower than 50°C, the gel breaking performance is reduced,...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a low-temperature gel-breaking system that solves the problems of poor gel-breaking performance and high cost in the prior art.

Images