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Long horizontal wells were established as the best strategy for good field economy on the Norwegian Continental Shelf in the early '90s. The wells, however, required new intervention methods. Statoil turned to Coiled Tubing (CT) as the primary option, but as the wells became more advanced, friction made interventions troublesome and operations with downhole motors costly and unpredictable. Simultaneously, Statoil began looking for improvements in through-tubing technologies. One such development was the Norwegian company Tomax AS's proprietary Anti-Stall Technology (AST).
The concept is based on controlling drilling torque by regulating the weight on bit to assist the driller attempting to do the same from surface. Placed anywhere in the BHA, the new tool function prevents stalls and extends the life of drilling tools through significant reductions in vibration and shock.
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