US Patent Issued to Schlumberger Technology on May 5 for "Methods for predicting and adapting to high frequency torsional oscillation" (British Inventor)

ALEXANDRIA, Va., May 5 -- United States Patent no. 12,618,317, issued on May 5, was assigned to Schlumberger Technology Corp. (Sugar Land, Texas).

"Methods for predicting and adapting to high frequency torsional oscillation" was invented by Ashley Bernard Johnson (Milton, Great Britain).

According to the abstract* released by the U.S. Patent & Trademark Office: "An accurate and elegant model is provided to characterize HFTO. For Type 1 HFTO, the model can predict frequency of the HFTO based on the distance between a reference location on the bottomhole assembly (e g., the end of the drill bit) and a point 40% up the motor. In short BHA strings there is the fundamental frequency while in longer BHA the first harmonic is used. For Type 2 HF...