Cable for downhole well monitoring

Abstract

A cable is provided with optical fibers for use for downhole monitoring such as inside an oil or gas well. The cable has a cable core (1) having one or more optical fibers, a first metal tube (2) surrounding the cable core (1), and a vault armouring layer (3) surrounding the first tube (2). The vault. armouring layer (3) has numerous armouring wires (3a, 3b), a second metal tube (4) surrounding the vault armouring layer (3), and an outer insulation jacket of a polymer surrounding said second tube (4). Such cable can be used inside of an oil or gas well for monitoring at high depths below 2000 meters, more preferable below 5000 meters, yet more preferable below 8000 meters.

Dependencies are inferred from the claim text.