Abundant experience with underbalanced drilling technology shows that many reservoirs do not perform at maximum potential when exposed to overbalanced drilling fluids. Broadening this lesson to benefit a greater number of wells requires the adaptation of current snubbing technology to meet a growing range of applications.

This paper examines the hydraulic rig assist (HRA) snubbing technology commonly used in horizontal drilling and considers the methods and equipment required for other applications. Using field examples from drilling and well service operations, the paper identifies key procedures and components needed to control well pressure at the surface and still allow the movement of tools and equipment.

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