Closed-loop steerable drilling system tackles multiple targets

Nelson Emery, Dennis Romero, Tony Lilburn Spirit Energy 76 Tom Claus, Greg Hull Baker Hughes Inteq This Hughes Christensen HCC TX445, 81/2-in. PDC bit has been specially designed for use with the rotary closed-loop drilling system. Empirical tests show that a long tandem gauge and a limited side-cutting action improve steerability (Fig. 3). A rotary steerable system penetrated a complex configuration of geologic targets, providing evidence that this technology may someday replace conventional geosteering technologies for many applications. Spirit Energy 76 (a business unit of Unocal Corp.) and Vastar Resources Inc. conducted a trial of Bak...

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