The production performance of Renqiu oilfield, which is a fractured massive carbonate reservoir with bottom water has indicated the remarkable blocking characteristic controlled mainly by inner faulted structures and karst formation.

Based on a comprehensive study on the data of the faulted structures, Karst formations and reservoir performance, the oilfield has been divided into eight development a blocks falling respectively into one of the three types: dolomite with well-developed high angled fractures, dolomite with fairly homogeneously developed fractures and cavities and intercalated dolomites with extremely heterogeneously developed crevices and fractures.

In view of the geological and development a characteristics of each type, proper technologies have been employed in the management of the oilfield. This has been done with fairly good results. Production decline rate has been controlled, production of a single well increased, interference from water producing zones in the open holes reduced, production potential in the formations with poorly developed fractures tapped, and recovery of the sections below interfaces raised. All of these will greatly improve the development of the oilfield in its medium-late stage.

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