Understanding Well and Reservoir Performance with Modern Analytical Techniques
Application of reservoir simulation models to understand and forecast reservoir performance is the preferred tools for reservoir management. Analytical tools are also useful and can provide simplicity while capturing the information derived from the events occurring at smaller time scales, which are ordinarily sacrificed in numerical simulations to keep the run time reasonable. An array of information derived from simple analytical tools can give insights into dynamic reservoir events occurring at different levels - field, injector/producer pairs, and single well. Furthermore, the array of information learned from analytical tools can guide an engineer in making changes to the flow model that are physically consistent. This study illustrates the use of some recently developed analytical tools with high-frequency real-time and/or periodic surveillance data to understand well performance. Specifically, we demonstrate the use of (1) modified-Hall analysis (MHA) to evaluate real-time performance of water injectors, (2) reciprocal-productivity index (RPI) to identify time varying injection support in a maximum reservoir contact (MRC) producer from nearby water injectors, (3) deconvolution and rate-transient analysis (RTA) to determine permeability, skin and drainage area of the well using real-time permanent down hole gauge (PDHG) data and (4) Y-function based on Buckley-Leverett (BL) equation and the assumption of a semi log relationship between the oil/water relative permeability ratio and saturation. The Y-function technique can be used in a matured waterflood as a production-decline- analysis tool in forecasting production and recovery and as a diagnostic tool to assess various aspects of waterflood performance. Examples include assessing waterflood maturity, calculating volumetric sweep efficiency, distinguishing normal waterflood breakthrough from the water channeling, and examining the consequences of operational changes. The methods presented are based on fundamental reservoir engineering concepts; therefore, they are versatile and easy to use. The four case studies demonstrate the power of using analytical tools for better understanding of both well and reservoir performance. Copyright 2013, Society of Petroleum Engineers.
L. Konwar et al., "Understanding Well and Reservoir Performance with Modern Analytical Techniques," SPE Reservoir Characterisation and Simulation Conference and Exhibition, RCSC 2013: New Approaches in Characterisation andModelling of Complex Reservoirs, Society of Petroleum Engineers (SPE), Jan 2013.
SPE Reservoir Characterisation and Simulation Conference and Exhibition: New Approaches in Characterisation and Modelling of Complex Reservoirs, RCSC 2013
Mining and Nuclear Engineering
Article - Conference proceedings
© 2013 Society of Petroleum Engineers (SPE), All rights reserved.