An improved threaded connection for joining tubulars for oil and gas field operations forms connected tubular strings. The improved threaded connection includes a one piece coupling comprising a body with an outer surface an inner surface and a central axis, a first tapered edge, a second tapered edge, first and second bearing faces for supporting load, weight, or both of the connected tubulars, a plurality of torque stops, and radial metal to metal seal surfaces. As the inner surface of the body is swaged onto each tubular, the inner surface of the body deflects away from the central axis, providing a plurality of bands of high contact pressure at each metal to metal seal between the inner surface of the body and each connected tubular to sustain seal pressures at the threaded one piece coupling.

An improved threaded connection for joining tubulars for oil and gas field operations forms connected tubular strings. The improved threaded connection includes a one piece coupling comprising a body with an outer surface an inner surface and a central axis, a first tapered edge, a second tapered edge, first and second bearing faces for supporting load, weight, or both of the connected tubulars, a plurality of torque stops, and radial metal to metal seal surfaces. As the inner surface of the body is swaged onto each tubular, the inner surface of the body deflects away from the central axis, providing a plurality of bands of high contact pressure at each metal to metal seal between the inner surface of the body and each connected tubular to sustain seal pressures at the threaded one piece coupling.

An electric wire protection member capable of suppressing the occurrence of breakage and swelling of a resin coating and separation of the resin coating from a metal pipe for a long period of time, and a wire harness including the electric wire protection member. The electric wire protection member includes a metal pipe into which an electric wire is to be inserted, and a resin coating that covers an outer surface of the metal pipe. The resin coating has at least one of a glass transition point of 40 C. or higher and a water vapor permeability coefficient of 260 g.Math.mm/m.sup.2.Math.24 hr or less, and has a thickness of 30 m or more.

An electric wire protection member capable of suppressing the occurrence of breakage and swelling of a resin coating and separation of the resin coating from a metal pipe for a long period of time, and a wire harness including the electric wire protection member. The electric wire protection member includes a metal pipe into which an electric wire is to be inserted, and a resin coating that covers an outer surface of the metal pipe. The resin coating has at least one of a glass transition point of 40 C. or higher and a water vapor permeability coefficient of 260 g.Math.mm/m.sup.2.Math.24 hr or less, and has a thickness of 30 m or more.

Compounds comprising multiple hydrophilic heads and a lipophilic tail may be contacted with a metal or other surface so as to adhere to the surface and inhibit corrosion, among other things. Suitable hydrophilic heads may include quaternary ammonium cation moieties, phosphonium cation moieties, and combinations thereof. Such corrosion-inhibiting compounds may be introduced into a wellbore penetrating at least a portion of a subterranean formation, for instance in oil and/or gas recovery operations and the like, whereupon the compound may adhere to a metal or other surface downhole so as to inhibit corrosion of the surface. These compounds may be employed in various other environments, such as any metal or other surface that may be exposed to corrosive conditions.

Compounds comprising multiple hydrophilic heads and a lipophilic tail may be contacted with a metal or other surface so as to adhere to the surface and inhibit corrosion, among other things. Suitable hydrophilic heads may include quaternary ammonium cation moieties, phosphonium cation moieties, and combinations thereof. Such corrosion-inhibiting compounds may be introduced into a wellbore penetrating at least a portion of a subterranean formation, for instance in oil and/or gas recovery operations and the like, whereupon the compound may adhere to a metal or other surface downhole so as to inhibit corrosion of the surface. These compounds may be employed in various other environments, such as any metal or other surface that may be exposed to corrosive conditions.

The present invention relates to a line element comprising a hooped tube provided at both ends thereof with two receptacles in which male and female end fittings made of high-strength steel are fastened. The invention also relates to a riser section comprising at least one auxiliary line element having such characteristics. Furthermore, the invention relates to a method for upgrading a riser pipe by replacing an auxiliary line element with a line element having such characteristics.

The present invention relates to a line element comprising a hooped tube provided at both ends thereof with two receptacles in which male and female end fittings made of high-strength steel are fastened. The invention also relates to a riser section comprising at least one auxiliary line element having such characteristics. Furthermore, the invention relates to a method for upgrading a riser pipe by replacing an auxiliary line element with a line element having such characteristics.

Fouling caused by contaminants onto a metallic tubular, flow conduit or vessel in an underground reservoir or extending from or to an underground reservoir may be inhibited by applying onto the surface of the metallic tubular, flow conduit or vessel a treatment agent comprising a hydrophobic tail and an anchor. The anchor attaches the treatment agent onto the surface of the metallic tubular, flow conduit or vessel.

Fouling caused by contaminants onto a metallic tubular, flow conduit or vessel in an underground reservoir or extending from or to an underground reservoir may be inhibited by applying onto the surface of the metallic tubular, flow conduit or vessel a treatment agent comprising a hydrophobic tail and an anchor. The anchor attaches the treatment agent onto the surface of the metallic tubular, flow conduit or vessel.