This paper presents a case history involving a unique dual cement system to shut off a geopressured water channel behind casing utilizing coiled tubing. The channeling problem was identified and documented using water flow logging techniques. Logging indicated the lower gravel packed selective could produce salt water if perforated without eliminating the suspected water channel. Reserves did not warrant a major rig workover, making a non-rig workover via coiled tubing the only viable option to repair the well. A unique dual cement system tested on a hesitation squeeze schedule pumped through coiled tubing with extremely limited thickening time was necessary to repair the primary cement job.

Keywords:
pressure communication, dual slurry cement system, coiled tubing operations, hesitation squeeze schedule, communication, cement chemistry, society of petroleum engineers, upstream oil & gas, spe 29474, water source
Subjects:
Casing and Cementing, Formation Evaluation & Management, Cement formulation (chemistry, properties), Completion Installation and Operations, Coiled tubing operations
Copyright 1995, Society of Petroleum Engineers
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