Lime-free oil-base mud proves effective in high temperature, CO2 environments

Unocal Thailand Ltd. has established a lime-free, oil-based drilling fluid system as the best option for drilling wells with high bottomhole temperatures and where invasions of CO2 and other acidic gases present a host of operational and economic setbacks. Click here to enlarge imageUnocal has used the uniquely engineered mud system incorporating an environmentally acceptable emulsifier package exclusively in the Gulf of Thailand, where it is primarily employed for slimhole wells (Fig. 1).From the company's favorable experience with the lime-free drilling fluids offshore Thailand, the authors recognize the mud system to be effective for drilling any high-CO2 or high-temperature envir...

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