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Seawater base fracturing fluid and preparation method thereof

A seawater and base pressure technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as difficulty in satisfying fracturing construction, and achieve the effects of overcoming damage, good compatibility, and good complexation.

Active Publication Date: 2012-08-01
CHINA NAT OFFSHORE OIL CORP +1
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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 cannot meet the requirements of fracturing operations.

Method used

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  • Seawater base fracturing fluid and preparation method thereof
  • Seawater base fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First prepare the thickener: take 50g of guar gum powder and add it to a mixed solution consisting of 100ml of ethanol and 50ml of water, add 3g of sodium hydroxide, control the temperature to 50-55℃, add 60ml of ethylene oxide, and react 3. After hours, cool to room temperature, filter and wash twice, then add to the mixed solution of 100ml isopropanol and 30ml water, add 2.5g sodium hydroxide, control the temperature at 60-65℃, react for 15min, add 5g chloroacetic acid and 1.5g Chlorosulfonic acid is reacted for 4 hours, cooled to room temperature, filtered, washed 3 times, dried and crushed to obtain dry powder to obtain hydroxyethyl carboxymethyl sulfonic acid guar gum.

[0020] Secondly, the preparation of crosslinking agent, add 10.0 g of zirconium oxychloride into 70 g of water, stir to dissolve, and then add 6.8 g of oxalic acid, 2.3 g of monoethanolamine, 4.7 g of triethanolamine, control the temperature at 45-50 ℃, and react for 3 hours to prepare Obtain alkanola...

Embodiment 2

[0030] First prepare the thickener: take 50g of guar gum powder and add it to a mixed solution of 100ml of ethanol and 40ml of water, add 4.0g of sodium hydroxide, control the temperature to 50-55℃, add 50ml of ethylene oxide, and react 3 hours, cool to room temperature, filter and wash twice, then add to the mixed solution of 100ml isopropanol and 20ml water, add 2.0g sodium hydroxide, control the temperature at 60-65℃, react for 15min, add 4.0g chloroacetic acid and 2.0 g of chlorosulfonic acid was reacted for 4 hours, cooled to room temperature, filtered, washed 3 times, dried and crushed to make a dry powder to obtain hydroxyethyl carboxymethyl sulfonic acid guar gum.

[0031] Secondly, the preparation of the crosslinking agent, take 9.0 g of zirconium oxychloride, add it to 77 g of water, stir to dissolve, then add 6.8 g of oxalic acid and 7.2 g of triethanolamine in sequence, control the temperature at 50-55°C, and react for 4 hours to obtain triethanolamine zirconic acid E...

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Abstract

The invention relates to seawater base fracturing fluid, which is obtained by the steps of mixing 97-99 weight parts of seawater, 0.3-0.7 weight part of a thickening agent, 0.5-0.8 weight part of a surfactant, 0.05-0.2 weight part of a potential of hydrogen (pH) adjusting agent and 0.01-0.05 weight part of a gel breaker, and then performing cross-linking reaction with 0.3-0.7 weight part of a cross-linking agent. The thickening agent is a guar gum derivative formed by modifying hydroxyalkyl, carboxyl alkyl and sulfonic acid groups. The invention further relates to a preparation method of the seawater base fracturing fluid.

Description

Technical field [0001] The invention relates to a seawater-based fracturing fluid and a preparation method thereof. Background technique [0002] Existing fracturing fluids are all prepared with fresh water, but for offshore oil fields, the provision of fresh water resources is affected by various factors such as space, transportation, and cost, and it is difficult to meet the needs of oil field fracturing. For offshore oilfields, seawater is a ubiquitous and easily accessible water resource. However, since seawater is a complex water system, it contains dozens of mineral elements and a variety of organic matter. It is a high-salt, multi-component water system. At present, the commonly used thickeners for water-based fracturing fluids are more or less affected by the composition of seawater and cannot meet the requirements of fracturing construction. [0003] Therefore, it is necessary to develop a fracturing fluid that is suitable for seawater and meets fracturing requirements. ...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 王杏尊刘书杰鲍文辉彭成勇冯虎郭布民黄杰彭雪飞
Owner CHINA NAT OFFSHORE OIL CORP
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