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Ultralow-concentration fracturing fluid and preparation method thereof

An ultra-low concentration, fracturing fluid technology, applied in chemical instruments and methods, drilling composition, etc., can solve problems such as affecting the effect of fracturing

Inactive Publication Date: 2012-01-25
西安长庆化工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above factors affect the effect of fracturing to a certain extent.

Method used

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  • Ultralow-concentration fracturing fluid and preparation method thereof
  • Ultralow-concentration fracturing fluid and preparation method thereof

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preparation example Construction

[0048] The preparation method of the present invention is realized through the following steps:

[0049] (1) Preparation of solution A: Add water to the container, add water, and slowly add hydroxypropyl guar gum while stirring with a pump or a stirrer, and then add surfactant and clay stabilizer respectively , bactericide, temperature-resistant enhancer, continue to circulate or stir for 30 minutes, so that the liquid is fully mixed to form solution A;

[0050] (2) While pumping solution A, mix solution A and cross-linking agent according to the volume ratio of solution A:cross-linking agent=100:1~100:2 to form fracturing fluid.

Embodiment 1

[0051] Embodiment 1: Prepare each material by following consumption:

[0052] 93.35 parts of water

[0053] Hydroxypropyl guar gum 0.25 parts

[0054] Inorganic boron crosslinking agent 1.0 parts

[0055] Hydrocarbon emulsifier 0.4 parts

[0056] Trimethylhydroxypropyl quaternary ammonium salt clay stabilizer 0.2 parts

[0057] Dodecyl dimethyl benzyl ammonium chloride 0.05 part

[0058] Monoethanolamine 0.2 part

[0059] The material of above-mentioned batching is prepared by following steps:

[0060] (1) Preparation of solution A: Add water to the container, add water, and slowly add hydroxypropyl guar gum while stirring with a pump or a stirrer, and then add hydrocarbon emulsifier, trimethyl Hydroxypropyl quaternary ammonium salt clay stabilizer, dodecyl dimethyl benzyl ammonium chloride, monoethanolamine, continue to circulate or stir for 30 minutes, so that the liquid is fully mixed to form solution A;

[0061] (2) While pumping solution A, mix solution A and inorg...

Embodiment 2

[0062] Embodiment 2: each material is prepared according to the following consumption:

[0063] Water 95.375 parts

[0064] Hydroxypropyl guar gum 0.3 parts

[0065] Inorganic boron crosslinking agent 1.5 parts

[0066] 1.2 parts of alkyl sulfonate emulsifier

[0067] Trimethylhydroxypropyl quaternary ammonium salt clay stabilizer 0.6 parts

[0068] Isothiazolinone 0.275 parts

[0069]Triethanolamine 0.5 part

[0070] The material of above-mentioned batching is prepared by following steps:

[0071] (1) Preparation of solution A: Add water to the container, add water, and slowly add hydroxypropyl guar gum while stirring with a pump or stirrer, and then add alkyl sulfonate emulsification Agent, trimethylhydroxypropyl quaternary ammonium salt clay stabilizer, isothiazolinone, triethanolamine, continue to circulate or stir for 30 minutes, so that the liquid is fully mixed to form solution A;

[0072] (2) While pumping solution A, mix solution A and inorganic boron crosslink...

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Abstract

The invention relates to an ultralow-concentration fracturing fluid and a preparation method thereof. Currently, a reservoir is reconstructed by adopting a hydraulic fracturing method with the following shortcomings: (1) the rubber crushing residue content in the fracturing fluid is high and is generally 500-600 mg / L; and (2) the using amount of the rubber crushing agent is larger during reconstructing the reservoir and the average using amount is up to about 0.03%. The ultralow-concentration fracturing fluid provided by the invention comprises 93.35-97.4 parts of water, 0.25-0.35 part of hydroxypropyl guar, 1.0-2.0 parts of cross-linking agent, 0.40-2.0 parts of surfactant, 0.20-1.0 part of clay stabilizer, 0.05-0.5 part of bacteriacide and 0.2-0.8 part of temperature resistant reinforcing agent; and the preparation method comprises the following steps of: preparing a solution A in a container; and mixing the solution A and the cross-linking agent according to a volume ratio of 100:1-100:2 so as to form the fracturing fluid. In the fracturing fluid provided by the invention, the concentration of the hydroxypropyl guar as a thickening agent is up to 0.25-0.35%.

Description

technical field [0001] The invention relates to an ultra-low concentration fracturing fluid used in the stimulation process of low-permeability and ultra-low-permeability gas field reservoir fracturing reconstruction and a preparation method thereof, in particular to a viscous fracturing fluid used in gas field fracturing construction A fracturing fluid system in which the concentration of hydroxypropyl guar gum is 0.30% to 0.35%. technical background [0002] At present, the reservoir depth of the Changqing gas field is higher than 3000m, and the reservoir temperature reaches above 90°C. Most of them use hydraulic fracturing for reservoir reconstruction. In order to ensure the smooth progress of fracturing construction, the water-based fracturing fluid system used The thickener hydroxypropyl guar gum has a concentration of 0.50% to 0.55%, which has good fracture-making and sand-carrying functions, but the system has the following shortcomings: [0003] ①The fracturing flui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
Inventor 杜彪杨海燕赵文丁里万华杨继刚赵燕红吕俊华叶智胡鹏飞窦淼李鹏吕宝强郭军安恒文程芳
Owner 西安长庆化工集团有限公司
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