Sulfonated humic acid fracturing fluid and preparation method thereof

A technology of sulfonated humic acid and fracturing fluid, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of fast dehydration, poor salt resistance, low sand-carrying performance, etc., and improve viscoelasticity , water retention improvement, considerable effect of salt resistance

Active Publication Date: 2020-06-26
SHAANXI UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

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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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  • Sulfonated humic acid fracturing fluid and preparation method thereof
  • Sulfonated humic acid fracturing fluid and preparation method thereof
  • Sulfonated humic acid fracturing fluid and preparation method thereof

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[0022] The invention discloses a method for preparing sulfonated humic acid fracturing fluid, wherein the sulfonated humic acid fracturing fluid is cross-linked by sulfonated humic acid and carboxymethyl guar gum through an organic zirconium crosslinking agent; The concentration of carboxymethyl guar gum is 0.5wt%, and the addition of sulfonated humic acid is (0.1-1)% of carboxymethyl guar gum solution quality, and the mass ratio of carboxymethyl guar gum solution and organic zirconium crosslinking agent is 100:1.

[0023] Principle of the present invention is:

[0024] After cross-linking with organozirconium cross-linking agent, carboxymethyl guar gum has improved gel strength and enhanced sand-carrying ability, but the modified carboxymethyl guar gum has the problem of rapid dehydration after cross-linking with organo-zirconium cross-linking agent . Humic acid is a kind of natural macromolecular aromatic polymer, which is very rich in reserves in my country, has the chara...

Embodiment 1

[0031] Add 3g of sodium hydroxide and 150g of deionized water into a three-necked flask. Heat to 50°C, completely dissolve humic acid in it, and then add 1.6g of sodium sulfite. Heating and stirring continued for 4h, and then dilute hydrochloric acid solution was added dropwise until a brown and black paste precipitated. Finally, the brown-black slurry is purified to obtain sulfonated humic acid. Add deionized water into the three-neck flask, heat to 50°C, dissolve 15g of zirconium oxychloride and 0.01g of ammonium chloride therein, and then add 20g of ethylene glycol and 16g of lactic acid. Afterwards, potassium hydroxide solution was added dropwise until the pH value reached neutrality, and the heating and stirring were continued for 4 hours, and then a colorless and transparent organic zirconium binder was obtained. Configure carboxymethyl guar gum solution, the configuration concentration is 0.5wt%, static swelling, sulfonated humic acid is added in the carboxymethyl gua...

Embodiment 2

[0034] Add 3g of sodium hydroxide and 150g of deionized water into a three-necked flask. Heat to 50°C, completely dissolve humic acid in it, and then add 1.6g of sodium sulfite. Heating and stirring continued for 4h, and then dilute hydrochloric acid solution was added dropwise until a brown and black paste precipitated. Finally, the brown-black slurry is purified to obtain sulfonated humic acid. Add deionized water into the three-neck flask, heat to 50°C, dissolve 15g of zirconium oxychloride and 0.01g of ammonium chloride therein, and then add 20g of ethylene glycol and 16g of lactic acid. Afterwards, potassium hydroxide solution was added dropwise until the pH value reached neutrality, and the heating and stirring were continued for 4 hours, and then a colorless and transparent organic zirconium binder was obtained. Configure carboxymethyl guar gum solution, the configuration concentration is 0.5wt%, static swelling, sulfonated humic acid is added in the carboxymethyl gua...

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Abstract

The invention discloses a sulfonated humic acid fracturing fluid and a preparation method thereof. The method comprises the steps of: 1) completely dissolving humic acid in a sodium hydroxide solution, then adding sodium sulfite, conducting heating and stirring continuously, and then adding a hydrochloric acid solution dropwise until brown and black pasty precipitates are generated; purifying thebrownish black slurry to obtain sulfonated humic acid; 2) dissolving zirconium oxychloride and ammonium chloride in water, then adding ethylene glycol and lactic acid, then adding a potassium hydroxide solution dropwise until the pH value is neutral, and continuously performing heating and stirring to obtain a colorless and transparent organic zirconium binder; 3) preparing a carboxymethyl guar gum solution; adding sulfonated humic acid into the carboxymethyl guar gum solution, and stirring the substances uniformly, and then adding an organic zirconium cross-linking agent to obtain the sulfonated humic acid fracturing fluid. According to the novel fracturing fluid obtained by the invention, the water-retaining properties are improved, the viscoelasticity is also improved, and the salt tolerance is very considerable due to the adding of sulfonic acid group.

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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/90C09K8/88C08H7/00C08J3/24C08L97/00C08L5/00
CPCC09K8/685C09K8/905C09K8/887C08H6/00C08J3/246C08J2397/00C08J2305/00C08J2497/00
Inventor 王晨王江涛杨晓武牛育华
Owner SHAANXI UNIV OF SCI & TECH
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