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 CO 2 and other acidic ...

Drilling deeper, longer and more challenging wells has been made possible by improvements in drilling technologies, including more efficient and effective drilling fluids. Drilling fluids, also ...

Patrick Kenny Statoil Stavanger, Norway The use of ester-based mud systems, instead of oil-based mud, helped drill difficult shales and high-angle well sections, including one of the world's longest ...