DRILL PIPES AND CASINGS UTILIZING MULTI-CONDUIT TUBULARS

摘要

A drill pipe and coupling method for drilling subterranean formations. The pipe includes an outer casing that is threadable at both ends for connection to other similar castings; at least one tubular conduit floating within the outer casing; and a coupler for coupling various outer casings of other drill pipes. The tubular conduit is designed to carry pressurized fluid. The coupler includes a seal subassembly for sealingly receiving and supporting the independent tubular conduits; a collar for connecting the seal subassembly to a drill pipe; and a lift subassembly for connecting the seal subassembly to another drill pipe.