A kind of sulfonated humic acid fracturing fluid and preparation method thereof

Abstract

The invention discloses a sulfonated humic acid fracturing fluid and a preparation method thereof. The method comprises: 1) completely dissolving humic acid in sodium hydroxide solution, then adding sodium sulfite, continuously heating and stirring, and then adding dropwise hydrochloric acid solution until brown and black paste precipitates are produced; the brown-black slurry is purified to obtain sulfonated humic acid; 2) dissolving zirconium oxychloride and ammonium chloride in water, then adding ethylene glycol and lactic acid, and then Add potassium hydroxide solution dropwise until the pH value reaches neutral, continue heating and stirring to obtain a colorless and transparent organic zirconium crosslinking agent; 3) configure carboxymethyl guar gum solution; add sulfonated humic acid to carboxymethyl Stir evenly in the guar gum-based solution; then add an organic zirconium cross-linking agent to obtain sulfonated humic acid fracturing fluid. The novel fracturing fluid obtained by the present invention not only improves the water retention, but also improves the viscoelasticity, and the addition of the sulfonic acid group makes the salt resistance very considerable.

Description

technical field [0001] The invention relates to the technical field of petroleum fracturing fluid preparation, in particular to a sulfonated humic acid fracturing fluid and a preparation method thereof. Background technique [0002] Water-based fracturing fluid is the most widely used. Guar gum fracturing fluid with polysaccharide as thickener is currently the most widely used water-based fracturing fluid. However, due to the slow dissolution rate of guar collagen powder and the high content of water-insoluble , there are many problems such as poor solubility, high price, low strength, low sand-carrying performance, and poor salt resistance in oil and gas extraction in oil fields. It is often necessary to modify it in actual engineering applications. Although modified After the modified carboxymethyl guar gum is cross-linked with the organic zirconium cross-linking agent, the gel strength is improved, and the sand-carrying ability is enhanced, but the modified carboxymethyl ...

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Problems solved by technology

[0002] Water-based fracturing fluid is the most widely used. Guar gum fracturing fluid with polysaccharide as thickener is currently the most widely used water-based fracturing fluid. However, due to the slow dissolution rate of guar collagen powder and the high content of water-insoluble , there are many problems such as poor solubility, high price, low strength, low sand-carrying performance, and poor salt resistance in oil and gas extraction in oil fields. It is often necessary to modify it in actual engineering applications. Although modified After the modified carboxymethyl guar gum is cross-linked with the organic zirconium cross-linking agent, the gel strength is improved, and the sand-carrying ability is enhanced, but the modified carboxymethyl guar gum is dehydrated quickly after being cross-linked with the organic zirconium cross-linking agent. The problem

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