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Hacksaw, many thanks for your conclusive comment. We are planning to convince our client to: 1. Use plastic centralizers for the pump assembly (contact with casing will be eliminated) 2. Install a CP system for each Well If the CP system is not accepted we will propose your suggestion: 1...

Hacksaw, this is exactly what we also tought a couple of months ago; we sent our request of "help" to five (5) well known pump manufacturers, including the one of your link: no one has answered! It seems they do not like to get involved.

[a]Hacksaw: good to know it; on top of that any stray current entering the casing close to the surface (cathodic point)would corrode the casing at its exit point (anode); with no CP system in place, which should protect the external side of the casing, I could imagine that the current exit point...

Thank you Hacksaw, I have understood the concept. Now I have to convince the pumps owner (our client, a government organization) to test all the pumps they have in the Wells (about 60 Nos) to see how many of them show a ground potential sufficient to cause stray currents on the Well casing. Also...

Sorry fo rhe delay in answering Hacksaw: you look very familiar with electrical stuff but I am not; the thing seems to be quite close to the concept of stray currents caused by a faulty pump phase: could you please explain your idea in an accessible way ? Thanks Georgevergese: High localized...

Thanks George, we know exactly the depth of the pump in relation to the position of the corroded points: these are in correspondence of the pump top flange and bottom of the motor (connection with the cooling exchanger); in one Well the corrosion has also taken place in correspondence of the 2nd...

Thank you Sraesttam, We do not have any inhibitor in the Well, only water. Galvanic corrosion is most probably the corrosion process which occurs between the SS pump top flange and the CS casing (annulus 19 mm, 3/4"); at 300 m (984 ft) depth and without centralizers it is most probable that the...

Thanks for the response. Yes, it is a 3-phase 4-wire motor, 4,160 V, 60 Hz, grounded by means of 10 ft steel pole (rod) driven into the ground at about 10 ft distance from the Well head. Water salinity: 1,300 TDS, no H2S, Ph: 6.8

Good afternoon, This is a question regarding Water Wells but the matter (casing corrosion caused by production Electrical Submersible Pump) should also be of interest in the oil Wells. We decided to ask such a questions to Oil Well engineers after a useless search in the Web of this topic in...