Oil reservoir of East-Messoyakha field formed of continental deposition environment is characterized by large degree of uncertainty and heterogeneity, observed even at a short distance from the wells. Other complicating factors are high viscous oil (110 centipoise), the presence of an active aquifer and a gas cap. In conditions of high uncertainties, as the geological concept of the field becomes more complex, the involvement of hard-to-recover reserves could be achieved by development of well drilling and well completion. Initially, there was information about the reservoir as a homogeneous reservoir with a thick gas cap and rim of highly viscous oil: the optimal row horizontal well pattern was chosen after calculations. Further studying of the reservoir clarified the idea of reservoir compartmentalization: the reservoir was divided into 3 cyclothems. For draining the maximum oil-saturated thickness from all of cyclothems, it was decided to drill low-angle well through them. With the next update of the conceptual model, theory of multiple-contact reservoir was supposed: development scheme was changed to primary drilling on cyclothem C with parallel study of the overlying objects. Based on the accumulated experience, Workflow was made. By a number of geological and technical criterias the design of well and completion type could be chosen. Besides, development scheme of the neighbor field analog is planned using this workflow. Using workflow allows choosing the optimal development system for a field with large lateral and vertical variability. Implemented development approaches that have changed in the course of a change in the geological concept can serve as experience in the initial assessment of the analogue-field development scheme.

You can access this article if you purchase or spend a download.