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Seawater-based fracturing fluid and preparation method thereof

A technology of seawater and base pressure, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as difficult to meet fracturing construction, and achieve good temperature resistance effect

Active Publication Date: 2012-04-18
张春雨
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commonly used water-based fracturing fluid thickeners are more or less affected by seawater components, and it is difficult to meet the requirements of fracturing operations

Method used

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  • Seawater-based fracturing fluid and preparation method thereof
  • Seawater-based fracturing fluid and preparation method thereof
  • Seawater-based fracturing fluid and preparation method thereof

Examples

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preparation example Construction

[0021] A preparation method of seawater-based fracturing fluid, comprising the steps of:

[0022] 1. Preparation of thickener: 15-30 parts of alkylacrylamide, 1-10 parts of 2-acrylamido-2-methylpropanesulfonic acid, 0.5-10 parts of vinylpyrrolidone, N, N-methylenebispropylene 0.1-3 parts of amide monomer, 47-83.4 parts of pure water, after nitrogen deoxygenation for 10-60 minutes, add 0.005-0.08 parts of initiator, polymerize for 3-8 hours at a temperature of 30-70°C, and then add 0.1-5 parts of basic catalyst and 1-10 parts of formaldehyde are reacted at a temperature of 40-80°C for 1-6 hours, dried and pulverized to obtain dry thickener powder;

[0023] 2. Preparation of cross-linking agent: one or more of the cross-linking agent zirconium oxychloride, zirconium tetrachloride, aluminum chloride and isopropanol, ethylene glycol, glycerin, citric acid, acetylacetone, glacial acetic acid One or more of lactic acid, malonic acid, sodium hydroxide and triethanolamine are dissolv...

Embodiment 1

[0026] Prepare 5000 grams of the present invention, its preparation method is as follows:

[0027] 1. Preparation of thickener: Take 30g of alkylacrylamide, 5g of 2-acrylamido-2-methylpropanesulfonic acid, 2g of vinylpyrrolidone, 0.1g of N, N-methylenebisacrylamide monomer and 62.9 parts of purified water , after nitrogen deoxygenation for 30 minutes, add 0.03g initiator, at a temperature of 50°C, polymerize for 8 hours, then add 1.1g of basic catalyst and 4.6g of formaldehyde, and react for 3 hours at a temperature of 70°C , dried and pulverized to obtain dry powder, which is 40 grams.

[0028] 2. Preparation of crosslinking agent: Take 1.02g zirconium oxychloride, 0.69g aluminum chloride, 5.25g isopropanol, 1.31g ethylene glycol, 0.20g acetylacetone, 1.28g glacial acetic acid, 0.33g malonic acid and 4.92 g of water was dissolved and mixed uniformly to prepare a crosslinking agent, which was 15 grams.

[0029] 3. Preparation of seawater-based fracturing fluid: Use a measuri...

Embodiment 2

[0031] Prepare 2000 grams of the present invention, and its preparation method is as follows:

[0032] 1. Preparation of thickener: Take 13.5g alkylacrylamide, 9.0g 2-acrylamido-2-methylpropanesulfonic acid, 4.5g vinylpyrrolidone, 0.9g N, N-methylenebisacrylamide monomer and 62.1 g of pure water, after nitrogen deoxygenation for 30 minutes, add 0.009g initiator, at a temperature of 50°C, polymerize for 8 hours, then add 2.34g of basic catalyst and 0.9g of formaldehyde, at a temperature of 70°C, React for 3 hours, dry and pulverize to obtain dry powder, which is 30 grams.

[0033] 2. Preparation of crosslinking agent: Take 0.408g zirconium oxychloride, 0.276g aluminum chloride, 2.1g isopropanol, 0.522g ethylene glycol, 0.078g acetylacetone, 0.51g glacial acetic acid, 0.132g malonic acid and 1.974 g water is dissolved and mixed uniformly to obtain a crosslinking agent. is 6.0 grams.

[0034] 3. Preparation of seawater-based fracturing fluid: Use a graduated cylinder to measur...

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Abstract

The invention belongs to the technical field of development of oil fields, and particularly relates to a seawater-based fracturing fluid which is suitable for preparing sweater and can be used for realizing continuous blending and a preparation method thereof. The seawater-based fracturing fluid is prepared from the following raw materials in part by weight: 0.5-1.5 parts of thickening agent, 0.3-1.0 parts of crosslinking agent, 0.2-0.6 parts of surfactant, 0.01-0.2 parts of pH value regulating agent, 0.01-0.2 parts of viscosity breaker, 46.5-64 parts of seawater and 35-50 parts of desalted seawater. The seawater-based fracturing fluid has the advantages of suitability for preparing seawater, capability of realizing continuous blending, high temperature resistance, high salt resistance, high shear resistance and quick dissolvability.

Description

technical field [0001] The invention belongs to the technical field of oil field development, and in particular relates to a seawater-based fracturing fluid suitable for seawater preparation and capable of continuous mixing and a preparation method thereof. Background technique [0002] In oil and gas exploration and development, fracturing is widely used in the reservoir stimulation of oil and gas wells to achieve the purpose of increasing oil and gas production. Many compositional systems have been used for fracturing stimulation. Among these composition systems, the water-based fracturing fluid system with water as the dispersion medium occupies a dominant position. The hydraulic fracturing based on freshwater system is the whole content of water-based fracturing. However, for offshore oilfields, the supply of fresh water resources is affected by various factors such as space, transportation, and cost, and it is difficult to meet the needs of oilfield fracturing reconst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C08F220/56C08F220/58C08F226/10C08F222/38
Inventor 张春雨靳红彬张运祥张如忠张胜张义勤范军胜宋峰张立
Owner 张春雨
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