Phase change fracturing fluid system for phase change fracturing

US10364388B2 · kind B2 · utility

Assignee

• Southwest Petroleum University · CN

Inventors

• Liqiang Zhao · Chengdu, CN
• Yong Yang · Cangzhou, CN
• Guangyan Du · Chengdu, CN
• Donghe Yu · Cangzhou, CN
• Juan Du · Shanghai, CN
• Hang Che · Cangzhou, CN
• Zhifeng Luo · Chengdu, CN
• Guohua Liu · Zhuhai, CN
• Yuxin Pei · Chengdu, CN
• Nianyin Li · Chengdu, CN
• Pingli Liu · Wilmington, US
• Kun XU · Chengdu, CN

Key dates

• Filing date: Sep 20, 2016
• Grant date: Jul 30, 2019
• Expiry date: Sep 20, 2036

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B43/26
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention discloses a phase change fracturing fluid system for phase change fracturing, including the following components in percentage by weight: 10%-40% of supramolecular construction unit, 0-40% of supramolecular function unit, 0.5%-2% of surfactant, 0-5% of inorganic salt, 0.5%-2% of oxidizing agent, 0-2% of cosolvent and the remaining of solvent. The supramolecular construction unit is melamine, triallyl isocyanurate, or a mixture thereof. The supramolecular function unit is vinyl acetate, acrylonitrile, or a mixture thereof. The solvent is methylbenzene, ethylbenzene, o-xylene, m-xylene or p-xylene. In the fracturing construction process, a conventional fracturing fluid is used for fracturing a formation first; the phase change fracturing fluid is then injected into the formation, or the phase change fracturing fluid and other fluids which cannot be subjected to phase change are injected into the formation together.