Abstract
Summary The development plan of Cormorant field exemplifies changes required as the nature of a large, complex field becomes better known. The number and locations of wells and the completion method have changed as the structural, stratigraphic, and diagenetic natures of the field became better known. A better understanding of a key development constraint—the drilling reach—has allowed changes to the development plan at significant cost savings. Close surveillance of geological results and field performance has been necessary to allow almost continuous updating. This paper discusses studies and evaluations undertaken by Esso E&P U.K. to evaluate such changes for each of the field's four fault blocks. These studies complemented work done by the operator, Shell U.K. E&P.
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