Temporary plugging agent for drilling fluid and preparation method thereof, and water-based drilling fluid and use thereof

US10647902B1 · kind B1 · utility

Assignee

• CHINA UNIVERSITY OF PETROLEUM (EAST CHINA) · CN

Inventors

• Weian Huang · Qingdao, CN
• Jingwen Wang · Shanghai, CN
• Ming Lei · Princeton, US
• Jiaqi Zhang · Baltimore, US
• Gongrang Li · Shandong, CN
• Kaihe Lv · Qingdao, CN
• Xiongjun Wu · Beijing, CN
• Zhengsong Qiu · Qingdao, CN

Key dates

• Filing date: Apr 25, 2019
• Grant date: May 12, 2020
• Expiry date: Apr 25, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K8/514
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention discloses temporary plugging agent for drilling fluid and preparation method thereof, and water-based drilling fluid and use thereof. The temporary plugging agent for drilling fluid is obtained by controlling gelatinized starch and a vinyl grafted monomer to have a polymerization reaction in an activator solution in the presence of a cross-linking agent and an initiator; the vinyl grafted monomer comprises acrylic acid, acrylamide, and 2-acrylamide-2-methyl propanesulfonic acid; the gelatinized starch is obtained by adding starch into deionized water to have a gelatinization reaction.