Abstract: A non-frustoconical coupling provides a mechanical connection used in fluid transport for hydrocarbon recovery operations.

Abstract: Aspects of the disclosure describe a non-frustoconical coupling used in connections for tubulars in hydrocarbon recovery operations.

Abstract: A non-frustoconical coupling provides a mechanical connection used in fluid transport for hydrocarbon recovery operations.

Abstract: A threaded connection for pipe or tubulars used in drill strings, casing, or production tubing. The threaded connection can have a box connector with box threads having a plurality of box thread teeth and a pin member with pin threads having a plurality of pin thread teeth. The teeth can have a crest, a load flank, a stab flank and a root. A restriction can be between the pin member and the box connector on the stab flank, wherein the restriction does not touch the pin member, and the restriction forms a first channel and a second channel for containing a thread sealing compound.

Abstract: A threaded casing connection and a thread pipe connector for connecting casing segments or tubing segments joined using a threaded connection. The threaded connection having a threaded coupling for engaging a mill end connector and a field end connector. The threaded connector has a metal barrier for accommodating any phase difference and length of the screw thread helices which limit the axial advancement of each pin connector with the threaded coupling.

Abstract: A threaded connection for engaging a first tubular and a second tubular with a threaded coupling. The threaded coupling has mill end teeth and field end teeth. Each tubular has a pin connector. The threaded coupling receives and engages both pin connectors. The threaded coupling has a controlled phase or a phase difference that limits the axial advancement of the pin connectors past a coupling midpoint. The threaded coupling has a relief groove that reduces the hoop stress if the mill end pin end and the field end pin end are not centered correctly at the coupling midpoint. The threaded coupling has a metal barrier formed by the phase difference and length of the screw thread helices which limit the axial advancement of each pin connector.