Polyamide ESP Cable Armor

[CBMEngineer]

We are dealing with some severe corrosion of ESP cable. Large portions of the galavnized armor are being corroded in some wells after 1-3 months in production. These are CBM wells (100% water cut) and gas with 0.7-1% CO2 flowing up the annulus.

Part of this corrosion is galvanic, between J-55 tubing, galvanized cable armor and 316SS capillary injection line, all held together with Monel bands.

We are looking at ordering cable with a plastic polyamide armor. Has anyone else tried this type of armor? Did you see swelling due to gas? Is this armor durable (it will be run into a multilateral well with significant horizontal section)? Comment?

 

[zerok]

Hi CBMEngineer,

Get in touch with Baker Hughes CENTRILIFT or SCHLUMBERGER regarding this issue. Galvanized steel is not adequate for corrosive gases so consider using monel armor instead. Moreover, consider using breathable cable jacket for gas swelling like CENTRILIFT breathable EPDM, lead ESP cables are also adequate.

You can also use a deep set packer (contact Baker oil tools for that, their packer are very reliable).

Regards.

 

[d23]

CBMEngineer

Most CBM operators would not want the expense of monel armor. We don’t know the well data, but a large portion of CBM wells use Polyethylene cable without armor. You may want to consult your cable supplier to see if Polyethylene would be appropriate for your wells.

D23