Clean fracturing fluid applied to hydraulic fracturing production increasing technology of oil-gas well

Abstract

The invention discloses a clean fracturing fluid applied to a hydraulic fracturing production increasing technology of an oil-gas well. The clean fracturing fluid comprises the following components in percentage by weight: 3.0 to 5.0 percent of potassium chloride, 1.0 to 3.0 percent of ammonium chloride, 0.4 to 0.6 percent of sodium salicylate and 92.0 to 95.0 percent of water. The clean fracturing fluid has high gel breaking capability and good de-filtration effect and is convenient for flowing back after gel breaking, a de-filtration coefficient and a filtration rate of the clean fracturing fluid are close to those of a guar gum fracturing fluid and a fenugreek gum fracturing fluid, and damage to the stratum is reduced.

Description

technical field [0001] The invention relates to a clean fracturing fluid applied in hydraulic fracturing stimulation technology of oil and gas wells. Background technique [0002] The performance improvement of clean fracturing fluid as a medium for creating fractures and carrying sand has always been a subject of research. Since hydraulic fracturing was carried out on a large scale in the 1950s, major changes have taken place in fracturing fluids, from single additives, the formation of the overall fracturing fluid formulation system, laboratory research equipment and methods to field application technology, etc., especially in the 1990s Since then, the research on fracturing fluid system tends to be perfected, and has played an important role in fracturing fluid chemistry and field application. [0003] Clean fracturing fluid was developed abroad in the 1990s. Since Schlumberger launched its first product J508 into the market in 1997, it has been rapidly promoted. The thr...

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Problems solved by technology

[0004] Domestic research on clean fracturing fluids is relatively late. At present, CTAB and Schlumberger’s J508 surfactant are the main VESs used. The problem is that the viscoelastic effect of CTAB is relatively weak, especially when the temperature is higher than 60 °C, the viscous It will be greatly reduced and lose the effective suspension effect on proppant

It has the characteristics of low cost, safety, strong operability, good comprehensive performance, and wide application range, but the potential problem is damage to water-sensitive reservoirs, as well as flow conductivity caused by residues, unbroken thickened gels, and filter cakes damage