ALEXANDRIA, Va., July 14 -- United States Patent no. 12,680,436, issued on July 14, was assigned to Halliburton Energy Services Inc. (Houston).

"Hydraulic fracturing with modulating injection flow rate" was invented by Glenn Howard Weightman (Duncan, Okla.), Timothy Holiman Hunter (Duncan, Okla.), Zhijie Sun (Houston), Andrew Silas Clyburn (Duncan, Okla.), Carlos Alfredo Vallejo Gordon (Houston) and Bruce Carl Lucas (Duncan, Okla.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A system for hydraulic fracturing includes a pump system fluidly coupled to a wellbore; and a controller configured to estimate a natural frequency of the wellbore based on a pressure wave response from the wellbore, and control the pu...