Acid clean fracturing fluid and preparation method thereof

Abstract

The invention relates to acid clean fracturing fluid and a preparation method thereof. The acid clean fracturing fluid consists of the following components in percentage by mass: 2 to 6 percent of surfactant, 1 to 4 percent of inorganic salt, 0.05 to 0.15 percent of counter-ion salt, 0.1 to 0.3 percent of cosolvent, 2 to 10 percent of acid and the balance of water. The method comprises the following steps of: dissolving the surfactant in the acid to prepare uniform liquid; adding the liquid into aqueous solution containing the inorganic salt, the counter-ion salt and the cosolvent; and stirring the mixture for 1 to 2 minutes to obtain the fluid having good viscoelasticity. The acid clean fracturing fluid is used for the fracturing of oil-gas fields at the temperature of between 60 and 120 DEG C, has the advantages of low viscosity, high elasticity, low friction resistance, high sand carrying, high effective control joints, increment on joint length and the like, can realize sand acid fracturing and finish all processes of acid fracturing and acidification, and has no residues after gel breaking and no damage to stratums.

Description

A kind of acid cleaning fracturing fluid and preparation method thereof technical field The invention relates to a fracturing fluid for acid fracturing stimulation measures in the process of oil and gas field exploitation, in particular to an acidic clean fracturing fluid and a preparation method thereof. Background technique Both acid fracturing technology and hydraulic fracturing technology are one of the important stimulation measures for low-permeability reservoir stimulation. Simple hydraulic sand fracturing, acid fracturing and acidizing technology have been widely studied and applied. These two technologies have their own advantages and disadvantages. For some reservoirs with special lithology, extremely poor physical properties, and ultra-low permeability, hydraulic fracturing, acid fracturing, and acidizing technologies alone often have unsatisfactory stimulation effects. Surfactant-based acid system is to add special viscoelastic surfactant to the acid liquid, a...

AI Technical Summary

Problems solved by technology

These two technologies have their own advantages and disadvantages. For some reservoirs with special lithology, extremely poor physical properties, and ultra-low permeability, hydraulic fracturing, acid fracturing, and acidizing technologies alone often have unsatisfactory stimulation results.