ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,421,827, issued on Sept. 23, was assigned to TRI-STATE ENVIRONMENTAL LLC (Houma, La.).

"Method and apparatus, including hose reel, for cleaning an oil and gas well riser assembly" was invented by Anthony Scott Carter (Petal, Miss.).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to an improved method and apparatus for cleaning oil and gas well riser sections wherein a specially configured cap or pair of caps are fitted to the ends of the riser which enable pressure washing cleaning tools (or a camera) to be inserted into and through the riser. Cleaner fluid continuously recirculates so that relatively small volume of cleanin...