Abstract
Abstract Maintaining wellbore quality, and in particular hole gauge, is crucial to the steering performance of point-the-bit rotary steerable systems (RSS).4 This paper describes how computer-based predictive modeling and full-scale laboratory drilling tests (conducted in horizontal concrete blocks) have been successful in optimizing bottomhole assembly (BHA) design in terms of directional steerability and hole quality. The modeled predictions were proven in the field as well as the laboratory. The precise control of drilling parameters and formation characteristics achieved in these laboratory tests has also been important in comparing laboratory drilling results with BHA software modeling predictions. Excellent correlation between BHA modeling and practical (laboratory and field) tests are obtained, resulting in data that is believed unique in the literature.4 Two distinct areas of BHA optimization related to the steering performance of an RSS in 6 1/8-in. hole were investigated.
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