ALEXANDRIA, Va., July 3 -- United States Patent no. 12,345,155, issued on July 1, was assigned to Southwest Petroleum University (Chengdu, China).

"Method for determining well wall collapse of single well for fractured-vuggy reservoir" was invented by Xiandong Jiang (Chengdu, China), Nutao Wang (Chengdu, China), Chengyang Zhang (Chengdu, China), Hang Li (Chengdu, China) and Min Wei (Chengdu, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for determining well wall collapse of a single well for a fractured-vuggy reservoir is provided. The method includes following steps: S1, treating the single well of the fractured-vuggy reservoir as an isolated reservoir; S2, calculating a water influx rate fo...