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Assessing reservoir uncertainties and a concept for monitoring and evaluating pressure tests - a case history in developing the Seturian Tight Gas Field

Proceedings Title : Proc. Indon. Petrol. Assoc., 31st Ann. Conv., 2007

Seturian is a tight gas field located in Kalimantan province and operated by Chevron Indonesia Business Unit. A development project is now progressing with a proposed two well first development stage to mitigate the risk prior to a more optimal full development campaign. This field was found nearly 30 years ago by 3 exploratory wells. The field consists of 13 stacked layers with permeability ranging from 1.6 to 50 mD based on the DST. The prime layers have 120 ft pay thickness with 2.6 mD permeability rock.Parallel with the infra-structure preparations, pressure test designs were proposed to evaluate the layer connectivity, to determine the structural frame work and to estimate well productivities. The test evaluations are an important factor in deciding on the number of wells and the way they are going to be completed in the second development stage.The design itself started by using a modern georeservoir simulation that was derived from a P-50 model assessed from a Plackett-Burman experimental design. Hoping that the model has orthogonally represented the most possible P-50 output range, the test was designed to meet the test objectives. To support the test implementation successfully, a long in-situ pressure measurement is required to record the pulse response, which can be downloaded daily to let the designated staff monitor, evaluate and give an early alert for well remediation. The optimal implementation of these processes may result in maximizing and gaining development values in a tight gas field, Seturian.To get a more optimal development strategy, it is required to break down the development into two stages. As a part of stage 1, surveillance monitoring to assess the final development options, real time well-monitoring was proposed to gain valuable information in a relatively short period of time in order to make very important decisions about well counts, completion strategies and well spacing. The real time data will then be delivered to the engineers desktop to be evaluated for further actions using the integrated approach from static, dynamic and pipeline network modeling.

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