Phase-change hydraulic fracturing process

US10301919B2 · kind B2 · utility

Assignee

• Southwest Petroleum University · CN

Inventors

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

Key dates

• Filing date: Sep 20, 2016
• Grant date: May 28, 2019
• Expiry date: Sep 20, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2208/30
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A phase-change hydraulic fracturing process, including the following steps: (1) injecting clean water or conventional fracturing fluid to a formation, so that the formation fractures; (2) placing non-phase-change liquid and phase-change liquid in different liquid mixing tanks and injecting into a shaft at the same time, an injection volume ratio of the non-phase-change liquid to the phase-change liquid is (0-0.7):(0.3-1); (3) injecting a displacement fluid into the shaft, so that the non-phase-change liquid and the phase-change liquid in the shaft completely enter a reservoir; (4) performing well shut-in and pressure-out for 30-200 min, so that solid-phase matters generated by the phase-change liquid are laid in the fracture; and (5) relieving pressure to finish the construction.