US Patent Issued to Landmark Graphics on Nov. 11 for "Calibration of drillstring weight for friction factor estimation" (Texas Inventor)

ALEXANDRIA, Va., Nov. 11 -- United States Patent no. 12,467,352, issued on Nov. 11, was assigned to Landmark Graphics Corp. (Houston).

"Calibration of drillstring weight for friction factor estimation" was invented by Robello Samuel (Cypress, Texas).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method comprises determining a value of at least one oppositional force for a drillstring at multiple depths in the wellbore, determining a value of hook load for the drillstring at the multiple depths based on the value of the at least one opposition force at the multiple depths, and determining a calibrated drillstring weight based on a change in the value of the hook load over the multiple depths of the wellbore....