US Patent Issued to Southwest Petroleum University on July 29 for "Strong salt-resistant self-degradation plugging agent for water-based drilling fluid and preparation method therefor" (Chinese Inventors)

ALEXANDRIA, Va., July 30 -- United States Patent no. 12,371,603, issued on July 29, was assigned to Southwest Petroleum University (Chengdu, China).

"Strong salt-resistant self-degradation plugging agent for water-based drilling fluid and preparation method therefor" was invented by Gang Xie (Chengdu, China), Qian Zhou (Chengdu, China), Linlin Zhang (Chengdu, China) and Ruolan Wang (Chengdu, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed are a strong salt-resistant self-degradation plugging agent for water-based drilling fluid and a preparation method therefor. The preparation method includes: modifying unsaturated polyhydroxyalkanoate by using 2-acrylamide-2-methylpropanesulfonic acid to pre...