US Patent Issued to Weatherford Technology Holdings on Sept. 23 for "Formation testing with controlled pressure drilling" (British Inventor)

ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,421,851, issued on Sept. 23, was assigned to Weatherford Technology Holdings LLC (Houston).

"Formation testing with controlled pressure drilling" was invented by Graeme MacFarlane (Aberdeen, Great Britain).

According to the abstract* released by the U.S. Patent & Trademark Office: "A formation testing method can include deploying a drill string including a packer and a circulating tool into a well, setting the packer, thereby blocking fluid flow through an annulus, and opening the circulating tool, thereby permitting fluid communication between the annulus and an interior flow passage of the drill string. The opening step can include displacing a radio frequency identification tag i...