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M-I SWACO Introduces Next Generation Water-Base Drilling Fluid for HTHP Environments


The ENVIROTHERM NT water-base drilling fluid provides stability under extreme HTHP conditions

AMSTERDAM, — M-I SWACO announced today the release of the ENVIROTHERM* NT water-base drilling fluid, which is designed for high-temperature, high-pressure (HTHP) wells, including those in shale plays, environmentally sensitive areas or projects that experience high temperatures and require a water-base drilling fluid system.

The ENVIROTHERM NT drilling fluid is a next generation, environmentally acceptable water-base system that is stable in the presence of contamination from soluble calcium, salts and acid gases. It can be used at temperatures in excess of 450 degF (232 degC) and densities up to 19.0 lbm/galUS (2.3 g/cm3). The drilling fluid has been field proven under severe conditions over 350 degF (177 degC), exhibiting stable properties while drilling and also during prolonged static conditions experienced during tripping, logging and testing operations.

In an HTHP tight gas reservoir in Hungary, an operator was faced with acid gas contamination (CO2 and H2S) and environmental limitations that put constraints on cuttings disposal and oil-base drilling fluid usage. The ENVIROTHERM NT system was used to safely drill to TD. The HTHP fluid loss was controlled while the rheology was actually lower than what the lab tests had shown. The reduced rheology helped minimize the equivalent circulating density (ECD) for the extremely high mud weight of 19.0 lbm/galUS (2.3 g/cm3).

The water-base drilling fluid is simple and easy to manage, requiring minimal dilution for HTHP environments, ensuring the fluid is maintained within specification, maximizing hole stability, drilling efficiency and cost effectiveness. It can be easily converted from a low to a high temperature system with no rheology increase or loss of other properties.

For more information on ENVIROTHERM NT, visit


M-I SWACO, a Schlumberger Company, is a global provider of a large range of products and engineering services designed to deliver drilling solutions, environmental solutions, wellbore productivity and production technologies.

Schlumberger is the world’s leading supplier of technology, integrated project management and information solutions to customers working in the oil and gas industry worldwide. Employing approximately 108,000 people representing over 140 nationalities and working in approximately 80 countries, Schlumberger provides the industry’s widest range of products and services from exploration through production.

Schlumberger Limited has principal offices in Paris, Houston and The Hague and reported revenues of $27.45 billion in 2010. For more information, visit


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