Guar gum cleaning fracturing fluid with micro residue and weak damage

Abstract

The invention relates to guar gum cleaning fracturing fluid with micro residue and weak damage. The guar gum cleaning fracturing fluid with micro residue and weak damage is composed of base liquid, a cross-linking agent and a gel breaker, the base liquid is composed of hydroxypropyl guar gum, a cleanup additive, an anti-swelling stabilizing agent, a fracturing bactericide, a fracturing de-emulsifier, a scale inhibitor and water. According to the invention, a guar gum multinucleated cross-linking agent with low amount is used, delay crosslinking effect is strong, guar gum concentration is greatly reduced, glue breaking residue amount is reduced, a multifunctional scale inhibitor is cooperated for preventing fouling generated by water used for fracturing liquid and stratum water, a selective polymer fracturing catalyst capable of thoroughly breaking glue and no generating sulfate radical is selected, liquid viscosity and residue content are reduced, the surface tension of the gel breaker after gel is broken is lower, the gel breaker is easily discharged, the formed guar gum multinucleated cross-linking agent has good temperature and shearing sustainability, and excellent proppant carrying capacity.

Description

technical field [0001] The invention belongs to the technical field of preparation of petrochemical products, and relates to a guar gum cleaning fracturing fluid with little residue and weak damage. Background technique [0002] Fracturing fluid is the liquid used in fracturing measures using liquid conduction force in the process of oilfield exploitation, and it is also a key preparation to ensure the success of fracturing and improve recovery. At present, the hydraulic fracturing fluid system used in various domestic oilfields is mainly guar gum and its derivatives, which are formed by adding various additives and combining cross-linking agents and gel breakers. With the advantages of strong operability, wide application range and good comprehensive performance, it has been widely used in oil and gas field development so far. However, conventional fracturing fluid systems still have problems such as large residues, poor gel breaking, and large damage caused by poor compat...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a micro-residue and weak-damage guar gum cleaning fracturing fluid with excellent performance for the problems of large residue, high damage rate and damage caused by poor compatibility of the system in the conventional fracturing fluid system. , in order to reduce the concentration of hydroxypropyl guar gum and the amount of gel-breaking residue, protect the oil layer, while maintaining excellent sand-suspending ability and temperature-resistant and shear-resistant ability, reduce the damage caused by fracturing fluid to the reservoir, and improve the performance of fracturing construction. Success rate and fracturing effect