DOWNHOLE CABLE

摘要

The present invention pertains to a cable comprising: —at least one conductor coated by an insulation coating layer, —a first protective layer surrounding said insulation coating layer, said first protective layer at least comprising, but preferably being made of a tetrafluoroethylene (TFE) copolymer comprising from 0.8% to 2.5% by weight of recurring units derived from at least one perfluorinated alkyl vinyl ether having formula (I) here below: CF2═CF—O—Rf, wherein Rf is a linear or branched C3-C5 perfluorinated alkyl group or a linear or branched C3-C12 perfluorinated alkyl group comprising one or more ether oxygen atoms, said TFE copolymer having a melt flow index comprised between 1.0 and 6.0 g/10 min, as measured according to ASTM D1238 at 372° C. under a load of 5 Kg [polymer (F)]; —optionally, a second protective layer surrounding said first protective layer, and —an armor shell surrounding said first or second protective layer. The invention also pertains to use of the cable in downhole wells.

主权项

1. A cable comprising:
at least one conductor coated by an insulation coating layer, a first protective layer surrounding said insulation coating layer, said first protective layer being made of a tetrafluoroethylene (TFE) copolymer [polymer (F)] consisting essentially of:
from 0.8% to 2.5% by weight of recurring units derived from at least one per-fluorinated alkyl vinyl ether having formula (I) here below:
CF2=CF—O—Rf, wherein Rf is a linear or branched C3-C5 perfluorinated alkyl group or a linear or branched C3-C12 perfluorinated alkyl group comprising one or more ether oxygen atoms, and
from 97.5% to 99.2% by weight of recurring units derived from TFE, said polymer (F) having a melt flow index comprised between 1.0 and 6.0 g/10 min, as measured according to ASTM D1238 at 372° C. under a load of 5 Kg; optionally, a second protective layer surrounding said first protective layer, and an armor shell surrounding said first or second protective layer.