Ampholytic surfactant fracturing fluid and preparation method thereof

Abstract

The invention relates to ampholytic surfactant fracturing fluid and a preparation method thereof. The ampholytic surfactant fracturing fluid comprises the following components in percentage by mass: 3 to 5 percent of ampholytic surfactant, 0.5 to 1 percent of anionic surfactant, 2 to 4 percent of inorganic salt, 0.3 to 0.5 percent of alcohol with low molecular weight, 0 to 5 percent of pH value regulator, 0.5 percent of clay stabilizer and the balance of water. The preparation method comprises the following steps of: adding the ampholytic surfactant, the anionic surfactant, the alcohol with low molecular weight, the pH value regulator, and the clay stabilizer into water, stirring for 5 to 10 minutes to obtain uniform and stable suspension, adding the inorganic salt, and stirring for 1 to 2 minutes to obtain fluid with high visco-elasticity. The ampholytic surfactant fracturing fluid is used for fracturing of an oil and gas field of which the formation temperature is 60 to 80 DEG C, residues are avoided after gel breaking, and a stratum is not damaged.

Description

technical field

[0001] The invention relates to a fracturing fluid for hydraulic fracturing stimulation measures in the process of oil and gas field exploitation, in particular to an amphoteric surfactant fracturing fluid and a preparation method thereof. Background technique

[0002] As the main stimulation measure of low permeability oil and gas reservoirs, fracturing has been developed rapidly and widely used, and fracturing fluid is an important part of fracturing technology. The most commonly used fracturing fluids at home and abroad are mainly water-based fracturing fluids with natural vegetable gum, cellulose and synthetic polymers as thickeners, which have been widely used in various oil fields and have achieved good production stimulation effects. However, the disadvantage of the water-based polymer fracturing fluid system is that the fracturing fluid does not completely break the gel, and the residue after the gel breaks will block the pores and fractures of the ro...