FR2583915A1 - PROBE SUPPLY CABLE FOR PETROLEUM DRILLING - Google Patents

Abstract

THE PRESENT INVENTION CONCERNS A PROBES POWER SUPPLY CABLE FOR OIL DRILLING, CONSISTING OF A 10 CENTRAL ELECTRIC CONDUCTOR AND TWO 20 SIDE CARRIER CABLES, THE CONDUCTOR AND THE TWO CARRIER CABLES BEING FLOODED IN 30 FLAT ELASTOMERIC SHEATH, CHARACTERISTICS IN THAT THE ELECTRICAL CONDUCTOR 10 IS COMPOSED OF AN ELECTRICAL WIRE 11, A MINERAL INSULATION LAYER 12 AND AN OUTER SHEATH 13, AND IN THAT THE ELASTOMERIC SHEATH IS COVERED WITH A SOFT METAL EXTERIOR ARMOR 40. APPLICATION TO OIL DRILLS.

Description

-21 - Probe supply cable for oil drilling This is

  Provided is a probe power cable

for oil drilling.

  This type of cable must be as small as possible to facilitate its passage through the borehole and allow to roll long lengths on reels. In addition, this type of

  cables must withstand the combined action of three extremely

  severely a mechanical stress because the pressure can reach a value greater than or equal to 350 bars, a chemical stress which is a function of the nature of the petroleum effluent, and finally a thermal stress because the temperature can reach a maximum of

  value greater than or equal to 1500C.

  Document GB-A-2 027 553 discloses a cable for oil drilling comprising a central electrical conductor and two lateral carrier cables, these three elements being embedded in a flat elastomeric sheath. This cable ensures a minimum space requirement thanks to the flat shape of the elastomer sheath, also ensures good resistance to crushing thanks to the presence of two lateral carrying cables, but on the other hand, does not provide a good external protection effective against skirmishes or other accidents of this kind, and neither good protection against high temperatures

attacks at the bottom of a borehole.

  The object of the present invention is to provide effective external protection by covering the elastomeric sheath with an outer metal armor, and a very good resistance to high temperatures by using as a central cable a

mineral insulation.

  The present invention relates to a probe supply cable for oil drilling, consisting of a central electrical conductor and two lateral carrier cables, the driver and the two

  carrying cables being embedded in a flat elastomeric sheath, which is

  characterized in that the electrical conductor is composed of an electric wire, a mineral insulating layer and an outer sheath, and in that the elastomeric sheath is covered with an outer armor

flexible metal.

  - 2 - It is described below, by way of example and with reference to

  attached drawings, a cable according to the invention.

  Figure 1 shows the cable with all its elements.

  Figure 2 shows the cable, in section along II of Figure 1.

  In Figure 1, we see the central conductor 10 composed of a central wire 11 of copper, a mineral insulator 12 in magnesia and a sheath 13 of stainless steel, the two carriers 20 each composed of steel son twisted, the synthetic elastomeric sheath 30 coating the central conductor and the two carrying cables, and finally the armor

  external metal 40 of the "Interlock" type.

  This outer armor 40 consists of a single metal ribbon

  41 wound helicoldalement and whose two edges overlap.

  The two carrier cables 20 are wired in opposite directions for

  obtain an anti-gyratory effect and avoid twisting of the cable.

  FIG. 2 clearly shows the flattened shape of the cable and the outside diameter of the carrier cables, which is greater than that of the driver.

  central, to ensure their anti-crush function.

-3

Claims (3)

  1 / Probe supply cable for oil drilling, constituted   of a central electrical conductor (10) and two cables-port-   lateral conductors (20), the conductor and the two carrier cables being embedded in a flattened elastomeric sheath (30), characterized in that the electrical conductor (10) is composed of an electric wire (11), a layer mineral insulation (12) and an outer sheath (13), and in that   that the elastomeric sheath is covered with an outer armor metal- flexible liquefier (40).   2 / Cable according to claim 1, characterized in that the outer armor (40) consists of a single metal ribbon (41) wound helically.   3 / Cable according to one of claims 1 or 2, characterized in that   the two carrier cables (20) are wired in the opposite direction.