Reservoir damage due to diesel oil and water mix

Dear forum members

We drill our carbonate reservoirs (with low permeability but large natural fractures) with diesel oil based mud (mud weights up to 1.9sg) and complete wells with cemented liners that we perforate underpressure later on.

Our drilling fluids contractor says the diesel oil that filtrates or penetrates the reservoir later on can get mixed with water produced during cementing job and create sticky material and thus considerably damage the formation.

Do any of you have encountered similar scenarios? What mitigations were in place? Is the risk really high?

Any information will be appreciated.

Thanks

Nazim

1 Answer(s)

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