ALEXANDRIA, Va., May 19 -- United States Patent no. 12,631,104, issued on May 19, was assigned to NINE DOWNHOLE TECHNOLOGIES LLC (Houston).
"Frac dart" was invented by Donald R. Greenlee (Houston), Brian Oligschlaeger (Houston) and Jon Greenlee (Houston).
According to the abstract* released by the U.S. Patent & Trademark Office: "A fracturing dart configured to seal the internal bore of a fracturing plug within a wellbore may comprise a body with a lower tapered section, a central shoulder section, and an upper cylindrical section. The fracturing dart may also comprise a first sealing assembly disposed on the lower tapered portion of the body and configured to engage an inner surface of the internal bore of the fracturing plug. The fractu...