Elastic sand-carrying fracturing fluid, thickener for the fracturing fluid and preparation method thereof

Abstract

The invention belongs to the technical field of oilfield chemistry and fracturing stimulation, and provides an elastic sand-carrying fracturing fluid, a thickener used in the fracturing fluid and a preparation method thereof. The raw materials for the preparation of the thickener include the following parts by weight Number of components: 0.5-1.5 parts of acrylamide; 1-5 parts of octadecyltrimethylammonium bromide; 0.05-0.15 parts of potassium persulfate; 0.005-0.015 parts of alkali; diethylene glycol distearate 1-5 parts; 0.5-1.5 parts of tripolyglycerol diisostearate; 0.2-0.8 parts of sodium tetradecyl carboxylate; 0.2-1.5 parts of fatty acid amidopropyl dimethylamine; 0.2-0.8 parts of tertiary amino alcohol The elastic sand-carrying fracturing fluid is composed of the following components in weight percentage: thickener 0.20%-0.55%; crosslinking agent 0.20%-0.55%; drainage aid 0.1%-0.5%; anti-swelling agent 0.1% -0.5%; the balance is water; the preparation method includes the steps of preparing an acrylamide solution, an intermediate solution, a product, and a thickener. The elastic sand-carrying fracturing fluid of the present invention has simple liquid preparation, obvious construction effect and good rheological performance; after the thickener and cross-linking agent are used in combination, the viscosity is low and the sand-carrying ability is strong.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry and fracturing stimulation, and in particular relates to an elastic sand-carrying fracturing fluid, a thickener used in the fracturing fluid and a preparation method thereof. Background technique [0002] At present, the prior art closest to the patent of the present invention is a gemini amphoteric viscoelastic surfactant and its preparation method and a clean fracturing fluid (patent number: CN106268496A) and viscoelastic surfactant using it as a thickening agent Fracturing fluid and its preparation method and application (patent number: CN103865511A). Although the viscoelastic surfactant cleaning fracturing fluid described in patent CN106268496A has good temperature resistance and simple process, the viscosity of the base fluid and the viscosity after cross-linking are high, the pumping of equipment is difficult, and the requirements for construction equipment are high. Sulfonic aci...

AI Technical Summary

Problems solved by technology

Although the viscoelastic surfactant cleaning fracturing fluid described in patent CN106268496A has good temperature resistance and simple process, the viscosity of the base fluid and the viscosity after cross-linking are high, the pumping of equipment is difficult, and the requirements for construction equipment are high. Sulfonic acid group, this group has great environmental pollution; the viscoelastic surfactant fracturing fluid described in patent CN103865511A is not resistant to temperature, is sensitive to temperature, the demand for surfactant is large, and the cost is expensive. The production cost of dialkylphthalein chloride is high, and the production process produces toxic hydrogen chloride gas, which is not conducive to environmental protection

Images