Special Report: New olefin-based drilling fluid improves operational, environmental profile

A nonaqueous drilling fluid system engineered with a low-viscosity synthetic internal olefin base resolved operational problems in drilling tight gas wells in the Basin Center area in Western Canada.Compared to previously used conventional drilling fluids that contained a high kinematic viscosity base fluid, the new system based on C14 internal olefins (IO) provided a lower rheological profile and improved downhole pressure management. Accordingly, by eliminating the repeated gas influx and mud losses on trips caused by the severe well ballooning encountered in the area, the operator met both drilling and postdrilling objectives.The high rheologies and equivalent circulating densities (EC...

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