Abstract
Abstract This paper presents field data that indicates the gauge on Polycrystalline Diamond Compact (PDC) bits may act as a near bit stabilizer. When used with a pendulum bottomhole assembly (BHA) having stabilizers placed at 60 and 90 feet above the bit, the BHA can have the tendencies of a building assembly. Field observations were verified by computer simulation using a two-dimensional static BHA model providing a predictive method for BHA analysis when using PDC bits. The results of a sensitivity analysis using the computer model are presented and will provide guidelines for stabilizer placement when using PDC bits in straight hole drilling applications. Included in the analysis will be the effects of PDC bit gauge length, wellbore inclination, drill collar stiffness, and hole diameter on the build and drop tendencies of pendulum BHA's when used with PDC bits as a function of weight on bit (WOB).
Published Version
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