Potassium Brine Compatibility

Hi

I am looking for any industry experience in using potassium formate brine as a completion fluid. The specific query is the long term effects of the brine in the A annulus which will remain in place below the Orifice valve of a gas lifted producer well. Potassium formate brine is naturally buffered and has been buffered further with bi-carbonate to give a pH of 9.5 - 10. The exposed tubing is L80 13Cr and the gas lift fluid has up to 3% CO2 but we think the interface with the top of the formate in the A annulus will not be exposed to new gas lift gas over time as the formate level will fall. The completion brine fluid weight could be 10.8ppg, therefore is not neat formate at 13.1ppg but diluted with about 70% fresh water. The BHT is 90 deg C.

There is lots of information in one of the brine providers website and the occasional SPE paper but nothing specific to our situation. 

I would be interested to hear what experience is out there.

Grant

3 Answer(s)

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