Integrated Well and Reservoir Surveillance in the Oman EOR Developments

摘要

Description of the Proposed paper: This paper focuses on the well and reservoir management, including integrated interpretation of EOR surveillance technologies with a discussion of the field development decisions that may depend on this interpretation. Brief Context: PDO has implemented Enhanced Oil Recovery (EOR) methods including thermal, chemical and miscible gas injection projects in several fields. In the first phase of these EOR projects, well and reservoir surveillance is key to increase the understanding of the effectiveness of the EOR processes in the various reservoirs. Well-planned and executed reservoir surveillance has proven in the past to add significantly to the ultimate recovery from reservoirs. Because of progress in data acquisition, processing and modeling techniques, well and reservoir surveillance data are increasingly used to optimize EOR processes. However, the interpretation and integration in well and reservoir management workflows is still challenging. This paper describes the ongoing development of workflows for the interpretation, modeling and integration of surveillance data in three EOR projects. The surveillance techniques include geomechanical modeling, thermal reservoir modeling, and monitoring through time-lapse seismic, surface deformation, microseismic temperature, pressure and saturation logging. Results, Conclusions: A summary of the surveillance results and the integrated interpretation results will be presented for several EOR developments: - a fractured carbonate reservoir in the North of the Sultanate of Oman which is developed through a steam assisted Gas Oil Gravity Drainage project; - a thermal steam drive in a clastic reservoir located in the South of the Sultanate of Oman; - A polymer flood in a heterogeneous clastic reservoir in the south of the sultanate of Oman. Technologies discussed in this presentation are applicable to other EOR projects with similar characteristics: - geomechanical modeling to analyse surface deformation and microseismic data in order to constrain reservoir realizations of the temperature distribution; - integrated analysis of various timelapse seismic methods to constrain the vertical and horizontal temperature distribution; - fracture monitoring to control the fracture propagation with polymer injection.