Carboxymethyl guar gum acid fracturing fluid

Abstract

The invention relates to carboxymethyl guar gum acid fracturing fluid, which is prepared from the following components of water, carboxymethyl hydroxypropyl guar gum, a CJ-2 heat-resistant reinforcing agent, a surfactant, a COP-SH clay stabilizer, and a JL-12 crosslinking agent, wherein the JL-12 crosslinking agent is prepared by complexing aluminium chloride and C3-C7 straight chain organic ketone; the COP-SH clay stabilizer is (C4-C8) small cationic quaternary ammonium salt; the CJ-2 heat-resistant reinforcing agent is a mixture of sulfuric acid and citric acid or ethylic acid, which has the pH value of 1-3; the surfactant is a non-ionic fluorocarbon surfactant; a thickening agent of a fracturing fluid system can be used under the acid condition, and the content of water insolubles is more than 5 percent lower than that of the conventional hydroxypropyl guar gum; the matched additives are non-cationic additives, and are difficult to adsorb after entering stratum, so that the wettability of stratum rocks cannot be changed and the performance of the additives cannot be reduced; and the gum-breaking residue of the fracturing fluid system is a little and the damage to the stratum islow.

Description

Technical field: [0001] The present invention relates to a kind of fracturing fluid used in oil well fracturing stimulation technology, specifically a kind of fracturing fluid with carboxymethyl hydroxypropyl guar gum as thickening agent and organic high-valent metal as crosslinking agent. Water-based fracturing fluid that cross-links under extreme conditions. Background technique: [0002] At present, most of the fracturing fluids used in oil and gas field fracturing reconstruction use guar gum and its derivatives (such as hydroxypropyl guar gum) as thickeners, and boron organic or inorganic substances as crosslinking agents. Fracturing fluid has good fracture-making and sand-carrying functions, but the system has the following three deficiencies, which affect the fracturing effect to a certain extent: [0003] ①The characteristics of guar gum and its modified products determine that the fracturing fluid system using it as a thickener can only be cross-linked under alkalin...

AI Technical Summary

Problems solved by technology

[0004] ②The supporting additives are mainly cationic, which are prone to adsorption in the formation, causing changes in rock wettability and performance reduction of additives;