摘要:
An ESP is suspended downhole on a cable comprising spirally wound copper clad steel conductors surrounded by nonmetallic sheathing wound in an opposite spiral direction, preferably in the direction of rotation of the rotor of the ESP. The torque exerted on the cable by the ESP is reacted against the conductors, relieving stress from the sheathing so that the cable may be light in weight yet support substantial loads.
摘要:
The invention relates to a cable suitable for supplying power to a drilling rig's top-drive assembly. In a typical embodiment, the power cable includes a plurality of high - conductivity conductors (11), an electromagnetic shield (13), two protective sheats (17, 19), and a reinforcing layer of braided aramid fibers (18) between the protective sheaths.
摘要:
A cable for use in hydrocarbon wells is manufactured by forming an impervious sheet material to define a plurality of recesses, introducing each of two or more conductors into a respective one of the recesses, and folding the sheet material and joining two edges thereof to form a seam. The recesses form compartments, each enclosing a substantial portion of a respective conductor, so that the conductors are separated from each other by portions of the casing which extend in-between the conductors. In alternative embodiments, the casing can be made from plastics sheet material, or both the sheet material of the casing and the conductors may be made from copper clad steel so as to avoid differential thermal expansion, in which case the casing may simply enclose the bundled conductors without separating them into compartments.
摘要:
A reelable slickline for use in downhole or subsea operations has a structural core comprising a plurality of non-metallic fibres in a matrix. The fibres represent in the region of 30 to 50 % of the volume of the core.
摘要:
The invention relates to a cable suitable to send electrical signals, said cable having a diameter of at most 10 mm and comprising a protective cover, wherein said cover comprises high strength polyolefin fibers and wherein the thickness of the cover is at most 10% of the diameter of the cable.
摘要:
The invention relates to a medical implantable lead of the kind being adapted to be implanted into a human or animal body for monitoring and/or controlling of an organ (2) inside the body. The lead (3) comprising a fixation means (6) in a distal end, which is adapted to fixate a distal end of the lead (3) to the organ, an electrode member (6) in the distal end adapted to be in contact with tissue of the organ and receive and/or transmit electrical signals from and/or to the organ, and at least one electrically conducting coil (8, 9), which includes one or more electrically conducting helical wires (11) and which is adapted to connect the electrode member in the distal end with a monitoring and/or controlling device (1) in a proximal end of the lead. The one or more individual wires (11) of the coil comprises a wire core (12) which is provided with a surrounding electrically insulating layer (13), which in its turn is provided with a surrounding electrically conducting shield layer (14), and the coil is close-lapped such that electrically conducting shield layers of adjacent loops of the coil are in electrical contact with each other.
摘要:
An umbilical for use in the offshore production of hydrocarbons comprising an assembly of functional elements at least one of which is an electrical power cable, characterised in that at least one conductor of at least one electrical power cable comprises one or more 6000 series aluminium strands.