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Oil Loss (Smearing) Due to Gas Cap Blowdown

Oil Loss (Smearing) Due to Gas Cap Blowdown

(OP)
All,

Thanks for looking at my thread/question. First post here.

I have a large oil reservoir (14-30 MMBO OOIP) that had a large initial gas cap. The oil band is approximately 20 feet thick. Wells in this oil band had poor performance due to gas and water coning. For example, wells perfed in the oil band producing at extremely high GORs (100,000+) and WORs (>0.90). In order to mitigate this poor performance, the operator completed wells in the gas cap and blew it down. Oil moved into the gas cap and was produced.

However, you would lose some oil due to residual loss. From the few sources I have, the new hydrocarbon saturation would be gas saturation + a new oil saturation of the rock. I am at a loss on how to calculate this oil loss.

If you do not have an answer, can anyone point me in the right direction? I have had trouble finding documentation in papers and textbooks on calculation oil loss due to gas cap blowdown. I've only found instances of a gas cap moving into the oil zone.

Thanks!

polizei11

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