«Oilfield engineering»

A metod for applying a multilayer model for interpretation of well hydrodynamic at the West Qurna 2 field

UDC: 622.276.346
DOI: 10.33285/0207-2351-2023-5(653)-51-57

Authors:

¹ National University of Oil and Gas "Gubkin University", Moscow, Russia
² LUKOIL-Engineering, Moscow, Russia

Keywords: wells hydrodynamic test studies, well logging, production logging test, reservoir properties, heterogeneity, multi-layer reservoirs, inter-layer cross-flows, multilayer model, permeability, skin-factor

Annotation:

The West Qurna 2 field is currently a strategically important project of LUKOIL PJSC, due to which a special attention is paid to additional study and clarification of its characteristics. Every year, more than 100 wells hydrodynamic tests (WHDT) and production logging tests (PLT) are carried out at the field. A joint analysis of the WHDT and PLT interpretation data made it possible to identify the presence of inter-layer cross-flows in the reservoir and their influence on the pressure behavior. According to the analysis results as well as the results of well logging, indicating a high heterogeneity of the production interval, the standard approach to WHDT interpretation using homogeneous reservoir models and double permeability reservoir model does not allow precise characterization of the producing section by the determined parameters. The appliance of the multilayer model is justified by the geological structure of the field, but there are significant difficulties of applying this model for practical calculations. The most significant one is determination of permeability and skin factor for each layer. At the same time, there are no criteria by which these values can be clarified. This article presents the developed methodology for determining criteria and algorithms for the input parameters calculation, necessary for the data interpretation obtained during wells hydrodynamic test studies of the West Qurna 2 field, using a multilayer reservoir model.

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