Fibre composite rod petroleum well intervention cable
A fiber composite rod intervention cable includes a central electrical cable portion; a bonding layer; a generally unidirectional carbon fiber composite mantle layer; a protective, balanced braided fiber composite layer. The central electrical cable portion includes a generally central electrical conductor with a first cross-section conductive area; an inner insulation layer on the central electrical conductor; and a coaxial electrical conductor layer having a second cross section conductive area equal to the first cross-section conductive area. The fiber composite rod intervention cable is arranged for being injected into a well from a drum unit via an injection unit at the wellhead and may carry an intervention tool, a logging tool, a well tractor with or without an energy source.
1. A fibre composite rod petroleum well intervention power cable comprising, in the following sequence:
a central electrical cable portion,
a bonding layer,
a generally unidirectional carbon fibre composite mantle layer, and
a braided fibre composite layer,
wherein said central electrical cable portion comprises:
a generally central electrical conductor with a first conductivity,
an inner insulation layer on said central electrical conductor, and
a coaxial electrical conductor layer having a second conductivity equal to said first conductivity.
2. The fibre composite rod petroleum well intervention power cable of claim 1 ,
wherein said electrical conductor has a first cross-section conductive area and said coaxial electrical conductor layer having a second cross section conductive area equal to said first cross-section conductive area.
3. The fibre composite rod petroleum well intervention cable of claim 1 , wherein one or both of said electrical conductors are made in copper.
4. The fibre composite rod petroleum well intervention cable of claim 1 , wherein one or both of said electrical conductors are made in aluminium.
5. The fibre composite rod petroleum well intervention cable of claim 1 , wherein one or both of said electrical conductors comprise conductive strands.
6. The fibre composite rod petroleum well intervention cable of claim 5 , wherein said conductive strands are twisted or braided.
7. The fibre composite rod petroleum well intervention cable of claim 1 , wherein one or both of said electrical conductors are solid metal.
8. The fibre composite rod petroleum well intervention cable of claim 1 , comprising a surface coating on said braided fibre composite layer.
9. The composite petroleum well fibre rod intervention cable of claim 8 , wherein said surface coating is thermoplastics, polyether Imide (PEI), polyether ketone (PEEK), polyarylether ketone (PAEK).
10. The fibre composite rod petroleum well intervention cable of claim 1 , said bonding layer being electrically insulating.
11. The fibre composite rod petroleum well intervention cable of claim 1 , wherein said braided fibre composite layer is balanced with regard to a torsion strength of oppositely directed layers.
12. The composite petroleum well fibre rod intervention cable of claim 1 , wherein a matrix of said unidirectional fibre composite layer is high temperature thermoset or thermoplastic resin.
13. The composite petroleum well fibre rod intervention cable of claim 12 , wherein said matrix is epoxy resin, phenolic resin, or bismaleimide (BMI) resin.
14. The composite petroleum well fibre rod intervention cable of claim 1 , wherein a matrix of said braided fibre composite layer is a high temperature thermoset or thermoplastic resin.
15. The composite petroleum well fibre rod intervention cable of claim 1 , wherein the cross-section area of said central electrical conductor is 2.6 mm 2 .
16. The composite petroleum well fibre rod intervention cable of claim 1 , said central conductor comprising 133 conductor filaments of 0.02 mm 2 cross section area each.
17. The composite petroleum well fibre rod intervention cable of claim 1 , said inner insulation layer is a perfluoroalkoxy alkane (PFA) layer with 0.130 inch (3.3 mm) outer diameter.
18. The composite petroleum well fibre rod intervention cable of claim 1 said inner insulation layer comprising a barrier layer having a thickness of 0.06 mm.
19. The composite petroleum well fibre rod intervention cable of claim 18 , said barrier layer being a wound heat sealable tape wound with partial overlap.
20. The composite petroleum well fibre rod intervention cable of claim 1 , said coaxial conductor comprising a braid of 200 conductor filaments, and having a cross-section area equal to 2.6 mm 2 .
21. The composite petroleum well fibre rod intervention cable of claim 1 , the bonding layer having a thickness of 0.06 mm.
22. The composite petroleum well fibre rod intervention cable of claim 21 , said bonding layer comprising a heat sealable tape wound with overlap.
23. The composite petroleum well fibre rod intervention cable of claim 1 , wherein a braiding angle of said braided fibre composite layer is between 30 and 60 degrees with the axial direction.
24. The composite petroleum well fibre rod intervention cable of claim 1 , wherein the fibres of said braided layer are carbon fibres, glass fibres, or aramid fibres.