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Preparation method of cross-linked acid

A technology of cross-linking acid and cross-linking agent, which is applied in chemical instruments and methods, composition of drilling holes, etc., can solve problems such as low reaction rate and low filtration loss

Inactive Publication Date: 2020-05-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the cross-linked acid in the prior art cannot simultaneously carry sand, low reaction rate, low fluid loss, and diversion and temporary plugging functions to achieve diversion and temporary plugging acid fracturing

Method used

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  • Preparation method of cross-linked acid
  • Preparation method of cross-linked acid
  • Preparation method of cross-linked acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] 1) Add 3 parts by mass of zirconium lactate and 3 parts by mass of aluminum chloride to 64 parts by mass of water, and fully stir and dissolve at 20°C;

[0076] 2) Add 5 parts by mass of triethanolamine and 20 parts by mass of lactic acid in sequence to the solution in step 1), and react at 20°C for 6 hours;

[0077] 3) Add 5 parts by mass of sodium dodecylbenzenesulfonate to the solution in step 2) at 20°C, stir and mix evenly to obtain crosslinking agent 1.

Embodiment 2

[0079] 1) Add 6 parts by mass of zirconium lactate and 6 parts by mass of aluminum chloride to 43 parts by mass of water, and fully stir and dissolve at 30°C;

[0080] 2) Add 10 parts by mass of diethanolamine and 25 parts by mass of citric acid in sequence to the solution in step 1), and react at a constant temperature of 30° C. for 4 hours;

[0081] 3) Add 10 parts by mass of sodium lauryl sulfate to the solution in step 2) at .30°C, stir and mix evenly to obtain crosslinking agent 2.

Embodiment 3

[0083] 1) Add 10 parts by mass of zirconium lactate and 10 parts by mass of aluminum chloride to 27 parts by mass of water, and fully stir and dissolve at 25°C;

[0084] 2) Add 15 parts by mass of triisopropanolamine and 23 parts of oxalic acid in sequence to the solution in step 1), and react at a constant temperature of 25°C for 3 hours;

[0085] 3) Add 15 parts by mass of sodium dodecylsulfonate to the solution in step 2) at 25°C, stir and mix evenly to obtain crosslinking agent 3.

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Abstract

The invention provides a preparation method of a cross-linked acid. The method comprises the following steps: 1) adding an acid-resistant thickening agent into a hydrochloric acid solution at a firststirring speed, and stirring at a second stirring speed to obtain a first acid solution; 2) sequentially adding an iron ion stabilizer, a corrosion inhibitor and a demulsification cleanup additive into the first acid solution, uniformly stirring at a third stirring speed, and standing to obtain a cross-linked acid base solution; and 3) adding a cross-linking agent into the cross-linked acid base solution, and stirring at a fourth stirring speed to obtain the cross-linked acid.

Description

technical field [0001] The invention provides a preparation method of cross-linked acid. Background technique [0002] Cross-linking acid mainly refers to the acid system in which thickener macromolecule and cross-linking agent small molecule are cross-linked under acidic conditions to form high-strength jelly, which is widely used in fracturing acidification and matrix acidification. According to different cross-linking conditions, cross-linking acid is divided into two categories: ground cross-linking acid and underground cross-linking acid. [0003] Domestic research on cross-linked acid system mainly focuses on ground cross-linked acid. The thickener and cross-linking agent cross-link slowly at room temperature, and the cross-linking strength increases continuously during injection along the wellbore, and the viscosity reaches the maximum when it contacts the reservoir. The surface cross-linked acid system has a high viscosity, which can reduce the reaction rate of aci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/72C09K8/74
CPCC09K8/72C09K8/725C09K8/74
Inventor 贾文峰蒋廷学张旭东姚奕明周珺
Owner CHINA PETROLEUM & CHEM CORP
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