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Clay expansion-proof agent for high temperature acidification

An anti-swelling agent and clay technology, applied in the field of chemical agents, can solve the problems of acidification effect and difficulty of residual acid.

Inactive Publication Date: 2009-08-26
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Cationic polymers can effectively inhibit clay swelling and migration, and play an important role in anti-swelling by acidification and injection water. Carried out of the oil layer, it has a great influence on the acidizing effect

Method used

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  • Clay expansion-proof agent for high temperature acidification
  • Clay expansion-proof agent for high temperature acidification
  • Clay expansion-proof agent for high temperature acidification

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Embodiment Construction

[0024] The composition, preparation process and performance parameters of the present invention will be described in detail below in conjunction with examples.

[0025] (1) Raw material performance requirements

[0026] The effective content of 2,3-glycidyltrimethylammonium chloride is greater than 96%;

[0027] The effective content of γ-aminopropyl trihydroxysilane is greater than 98%;

[0028] The effective content of guanidine hydrochloride is greater than 93%.

[0029] (2) Preparation examples and performance parameters of clay anti-swelling agent for high temperature acidification

[0030] To the activated 1m 3 Add 650kg of water into the emulsifier, heat to 45°C, stir at low speed, slowly add 15kg of guanidine hydrochloride and 300kg of 2,3-glycidyltrimethylammonium chloride, and stir until completely dissolved. Adjust the mixer to a high speed, add 35kg of γ-aminopropyltrihydroxysilane while stirring, and stir until a uniform transparent solution is formed, which is the cl...

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Abstract

The invention provides a clay antiswelling agent for high-temperature acidification, which is composed of 2,3-epoxypropyltrimethylammonium chloride, γ-aminopropyltriethoxysilane, guanidine hydrochloride and water. Composed of components, the mass content of each component is 2,3-epoxypropyltrimethylammonium chloride: 27% to 50%, γ-aminopropyltriethoxysilane: 3% to 5%, Guanidine hydrochloride: 1%-3%, water: 43%-66%, and the sum of the ingredients in the clay anti-swelling agent for high-temperature acidification is 100%. The clay anti-swelling agent for high-temperature acidification provided by the invention achieves the purpose of anti-swelling through the mechanism of neutralizing the clay surface electricity and making the clay surface weakly hydrophilic, and the clay anti-swelling rate at the optimum concentration is greater than 50%. The anti-swelling agent does not cause particles to coalesce and has no side effects on acidification.

Description

Technical field: [0001] The invention relates to a chemical agent for acidification of oil fields, especially a clay anti-swelling agent for high-temperature acidification. Background technique: [0002] The formation contains a certain amount of clay minerals such as kaolinite, montmorillonite, illite and chlorite. These clay minerals are mainly composed of silicon-oxygen tetrahedra and aluminum-oxygen octahedrons in a layered structure. Among them, montmorillonite is composed of two layers of silicon-oxygen tetrahedrons and a layer of aluminum-oxygen octahedrons. The surfaces between the layers are all oxygen layers. The bonding force between the layers is weak and the cation exchange capacity is large. When it comes into contact with water, water can enter the crystal layer. In between, the exchangeable cations on the surface of the crystal layer dissociate and diffuse in the water to form a diffusion double layer, which charges the surface, and the crystal layers repel each o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74
Inventor 张贵才孙铭勤葛际江
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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