Steerable hole-enlargement technology drills complex directional wells

Following repeated failure of bicenter drillbits to meet demanding requirements in a number of offshore East Malaysia wells, Royal Dutch/Shell Group's Shell Malaysia Ltd. drilled six wells with an alternate, steerable, hole-enlargement technology.The company ran tools, known as the "Near Bit Reamer" (NBR), in a variety of bottomhole assembly (BHA) configurations. Engineers also ran, within the drillstring, a tool called the "Cuttings Bed Impeller" (CBI) to facilitate hole cleaning and maintain hole quality.The technology enabled crews to drill out the cement shoe and enlarge the wellbore in a single run, saving multiple trips for reaming. The BHAs drilled uniform gauge and clean boreh...

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