REINFORCED POLYMERIC SHEATH COVERED GEOPHYSICAL LOAD-CARRYING CABLE AND ITS APPLICATION PROCESS Russian patent published in 2006 - IPC H01B7/18 

FIELD: geophysical investigations; cables for oil and gas wells.

SUBSTANCE: proposed reinforced polymeric sheath covered geophysical load-carrying cable whose specific mass and cost are comparable with mass produced ones but whose armor wires are reliably protected against detrimental impact of chemically active liquid of wells has one or more insulated conductors and is provided with at least two steel-wire armor lays permitting intermediate sheaths and polymeric sheath overall; the latter is reinforced by steel wire net with longitudinal and transversal sizes of cell amounting to 1 - 10 diameters of wire. Armor of cable armor and/or of polymeric-filler reinforcing member may be produced from steel wire free from zinc coat provided overall sheath is used. Reinforcing materials are polypropylene, polyamide, or self-curing material threads. Air gaps between armor wires and/or reinforcing members of sheath are filled with self-curing sealing compound, such as thiokol or silicone compound. Proposed method for investigating wells, including those where hydrogen sulfide content and wellhead pressure are high involves tripping of geophysical instruments and pieces of equipment by means of cable; in the process tripping operations are conducted using reinforced polymeric sheath covered geophysical cable. Work in wells using cable of proposed mechanical design is identical to technology with mass-produced geophysical cables, but in the former case work can be done with minimal cost in wells containing hydrogen sulfide and those where wellhead pressure is high.

EFFECT: minimized cost and ability of using proposed cable in hydrogen sulfide environment of wells at high wellhead pressure.

5 cl, 4 dwg