Drill pipes and casings utilizing multi-conduit tubulars

Abstract From the Canadian patent

This invention describes a tubular for use in well drilling and production. The tubular is comprised of an elongated pipe with ends adapted to be connected with ends of other similar drill pipes. A plurality of independent arcuately spaced conduits are spaced uniformly from one end of the pipe to the other end. This allows a plurality of different fluids to be communicated to and from the well. The method of connecting the tubulars together to provide a transmission path involves placing one electrical wire in one conduit of the tubular, then terminating each wire with an electrical connector fixed in a respective opening of the conduit, then sealing the end of each tubular around the …