The present application discloses a hose that uses pressure to lock itself into a fixed position. The basic structure may comprise an internal flexible tube which contains a fluid and a mechanical exoskeleton. The mechanical exoskeleton may move freely without pressure, but may lock into place once the tube is pressurized.

The present application discloses a hose that uses pressure to lock itself into a fixed position. The basic structure may comprise an internal flexible tube which contains a fluid and a mechanical exoskeleton. The mechanical exoskeleton may move freely without pressure, but may lock into place once the tube is pressurized.

The invention relates to long-dimensional flexible tubes (coiled tubing). There are three variants of the basic channels (of an umbilical coiled tubing) proposed and all of them have two kind of the external flanges (edged or shaped ones) and include means of production. All variants include multi-stage sequential shaping process of one or multiple strips at an estimated geometry, and where isolated channels, partitions and flanges are formed during this process. If required, longitudinal butts of an additional longitude strips can be welded to them to form an umbilical coiled tubing which can be reeled up to a drum. Other types of service channels (electric, fiber-optic, capillary etc.) can be placed inside or outside channels in the form of a flexible belts. Flanges located beyond the outside dimensions of an umbilical coiled tubing may have a wave-type of form. Welding seams, flanges, centers of a closed channels and partitions are located, mainly, on the middle line of an umbilical coiled tubing's cross-section. The umbilical coiled tubing makes it possible to significantly increase possibilities of coiled tubing units in technological operations as well as in artificial lift methods due to its multi-channel design and, consequently, multifunctionality.

The use of PEKK for lowering the CO.sub.2 and H.sub.2S permeability of a part intended to enter into contact with a petroleum effluent. Also, a pipe for transporting a petroleum effluent, including a layer intended to be in contact with the petroleum effluent, wherein the layer intended to be in contact with the petroleum effluent comprises PEKK and has a CO.sub.2 permeability at 130 C. of less than 10.sup.8 cm.sup.3, for a thickness of 1 cm and a surface area of 1 cm.sup.2 and per second and bar of CO.sub.2 pressure and/or an H.sub.2S permeability at 130 C. of less than 10.sup.8 cm.sup.3 for a thickness of 1 cm and a surface area of 1 cm.sup.2 and per second and bar of H.sub.2S pressure, the amount of CO.sub.2 and H.sub.2S being measured by GC, respectively. Lastly, a number of methods for manufacturing such a pipe.

The invention relates to long, flexible tubing which can be wound on a spool (coiled tubing or flexible production tubing), and comprises two closed channels combined in a single structure, said channels being formed from a single strip by repeated and successive shaping and welding, and being joined to one another by a connecting, jointing or dividing partition. A connecting partition is perforated, and has mounted thereon a flexible service belt having locking connecting cams which correspond to matching locking holes on the perforated connecting partition. The service belt has electrical cables, wires, capillary tubing, and fiber optic lines arranged therein, and the interval between the connecting cams is twice the size of the interval between the holes on the perforated connecting partition. If the closed channels are joined by an jointing partition, then a pipe-in-pipe design variant is used. If the closed channels are joined by a dividing partition, then the latter also forms part of the wall of both closed channels. The dividing partition can be twice the thickness of the strip. The weld seams, the centers of the closed channels and the partition are situated on a midline of a cross section of the string, parallel to the axis of a spool. The proposed invention makes it possible to significantly increase the potential of coiled tubing units and of the coiled tubing itself by virtue of being multi-channeled and, as a result, multi-functional.

The invention relates to lengthy umbilical flexible tubing that can be wound on a reel, and more particularly to coiled tubing or flexible production tubing. The technical effect is to increase the potential of well process operations. A lengthy umbilical flexible tubing element comprises at least two isolated channels combined to form a single structure. The isolated channels are joined to one another by an interfacing partition formed by welding the points of connection between the walls of the isolated channels to one another. The at least two isolated channels and the interfacing partition are formed from two separate metal strips by shaping said metal strips from the middle by longitudinal bending, and subsequently welding the opposing longitudinal edges of the two metal strips to one another. Jointing or dividing partition is provided with holes and is double the thickness of a metal strip. One of the metal strips is made of steel that exhibits high strength under tension, and the other metal strip is made of steel that exhibits high ductility under compression.

The invention relates to lengthy umbilical flexible tubing that can be wound on a reel, and more particularly to coiled tubing or flexible production tubing. The technical effect is to increase the potential of well process operations. A lengthy umbilical flexible tubing element comprises at least two isolated channels combined to form a single structure. The isolated channels are joined to one another by an interfacing partition formed by welding the points of connection between the walls of the isolated channels to one another. The at least two isolated channels and the interfacing partition are formed from two separate metal strips by shaping said metal strips from the middle by longitudinal bending, and subsequently welding the opposing longitudinal edges of the two metal strips to one another. Jointing or dividing partition is provided with holes and is double the thickness of a metal strip. One of the metal strips is made of steel that exhibits high strength under tension, and the other metal strip is made of steel that exhibits high ductility under compression.

A corrosion resistant tube includes a tubular low carbon steel body having an inside surface and an outside surface, a corrosion resistant metal coating on the inside surface, a first corrosion resistant metal coating on the outside surface, a second corrosion resistant metal coating applied to the first corrosion resistant metal coating on the outside surface, and a polymer layer applied over the second corrosion resistant metal coating. A method of manufacturing a corrosion resistant tube, includes applying a corrosion resistant metal coating both sides of a strip of low carbon steel, forming the strip into a tube and welding the edges to form a tubular body. The weld is narrower at the inside surface than at the outside surface of the tubular body. The corrosion resistant metal coating on the inside surface is heated during welding and flows across and covers the weld.

A corrosion resistant tube includes a tubular low carbon steel body having an inside surface and an outside surface, a corrosion resistant metal coating on the inside surface, a first corrosion resistant metal coating on the outside surface, a second corrosion resistant metal coating applied to the first corrosion resistant metal coating on the outside surface, and a polymer layer applied over the second corrosion resistant metal coating. A method of manufacturing a corrosion resistant tube, includes applying a corrosion resistant metal coating both sides of a strip of low carbon steel, forming the strip into a tube and welding the edges to form a tubular body. The weld is narrower at the inside surface than at the outside surface of the tubular body. The corrosion resistant metal coating on the inside surface is heated during welding and flows across and covers the weld.

A hose line and a method for producing the same. The hose line (1) has a hose connection (3) which has a connection piece having a connection nipple. A hose end of a flexible hose (2) is pushed onto the connection nipple. The hose connection (3) also has a crimp sleeve (6) which immovably clamps the hose end between itself and the connection nipple in the longitudinal direction of the nipple. There are at least two tool contact surfaces on the hose connection (3), arranged on opposite sides of the hose connection (3), preferably allocated to each other in pairs and in particular designed as wrench contact surfaces (7). The at least two tool contact surfaces of the hose connection (3), which are allocated to each other in pairs, are on the crimp sleeve (6). A ratio of a length of the crimp sleeve (6) to an outside diameter of the flexible hose is 1.5:1 to 3:1.