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Acidic surfactant fracture liquid system

An acidic surface and active agent technology, which is applied in the field of acidic surfactant fracturing fluid system, can solve the problems affecting the stimulation effect of fracturing, dentition fracture permeability and formation permeability damage, etc.

Active Publication Date: 2013-07-24
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The insoluble matter of the vegetable gum itself and the residual gum after breaking the gum cause damage to the permeability of the dentition fracture and the permeability of the formation, affecting the effect of fracturing stimulation

Method used

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  • Acidic surfactant fracture liquid system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] At room temperature of 25°C, 2.2g of cetyltrimethylammonium bromide and 0.8g of potassium hydrogen phthalate were sequentially added into water and stirred evenly. Then slowly add 30ml of 37% hydrochloric acid and 0.1% hydrofluoric acid mixture under stirring conditions and continue stirring for 5 minutes to prepare an acidic surfactant fracturing fluid with an initial viscosity of 40mPa·s. For the fracturing fluid at 60°C, see the temperature resistance and shear resistance of 170S-1 figure 1 .

[0020] The fracturing fluid is mixed with 1:1 water at 60°C. After breaking the gel, the viscosity of the fracturing fluid is 2.4mP·s and the surface tension is 22mN / m.

Embodiment 2

[0022] The acidic surfactant fracturing fluid was prepared according to the above steps, except that the amount of cetyltrimethylammonium bromide was 5.0 g, and the initial viscosity of the prepared acidic surfactant fracturing fluid was 80 mPa·s.

Embodiment 3

[0024] The acidic surfactant fracturing fluid was prepared according to the above steps, the different amount of potassium hydrogen phthalate was 2.5 g, and the initial viscosity of the prepared acidic surfactant fracturing fluid was 60 mPa·s.

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Abstract

The invention relates to an acidic surfactant fracture liquid system. The system comprises 2.0-5.0wt% of cetyltrimethylammonium bromide, 0.5-2.5wt% of potassium biphthalate, 10-20wt% of hydrochloric acid, 0.1-1.5wt% of hydrofluoric acid, and the balance water. The fracture liquid system is suitable for 40-60DEG C reservoir stratums, can be used for acidifying unblocking and sand addition fracturing, and is diluted and broken by stratum water or an organic fluid after the fracturing construction.

Description

technical field [0001] The invention relates to an acidic surfactant fracturing fluid system for acidizing fracturing of oil and gas wells. Background technique [0002] The current fracturing fluid mainly uses vegetable gum as a thickener, which is cross-linked with a cross-linking agent under appropriate conditions to form a polymer network structure with a certain viscosity. The gel breaking of this type of fracturing fluid must use chemical breaking. Adhesive, destroying the polymer network structure to achieve the purpose of gel breaking. The insoluble matter of the vegetable gum itself and the residual gum after breaking the gum will cause damage to the permeability of the dentition fracture and the formation permeability, and affect the effect of fracturing stimulation. [0003] At the end of the 20th century, Schlumberger developed a fracturing fluid that uses surfactants as thickeners. The surfactant used in the fracturing leaf system is mainly cationic compounds c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/72
Inventor 吕宝强徐永高赵振峰薛小佳吴江吕海燕周晓群李向平赵文王文雄樊凤玲
Owner PETROCHINA CO LTD
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