Browsing by Subject "pressure transient analysis"
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Item An Integrated Well Performance Study for Shale Reservoir Systems - Application to the Marcellus Shale(2013-11-15) Riser, Landon JessIn this work we focus on the integration of two independent analyses, time-rate analysis and model-based production analysis, as an approach to resolve the uncertainty in estimating ultimate recovery (EUR) for wells in unconventional reservoirs. In particular, we seek to establish a relationship between time-rate parameters from modern time-rate models and the reservoir and completion properties obtained from model-based production analysis. Establishing agreement between these independent analyses will support the practice of EURs in unconventional reservoir systems. In this work we provide a study of 55 (fifty-five) shale gas wells taken from the Marcellus shale (USA), complete with an integrated workflow of model-based production analysis and time-rate analysis accompanied by a discussion of challenges and methodologies. In addition, we present a study on pressure transient analysis (PTA) for selected pressure buildup tests conducted on a series of Marcellus shale wells. We include field cases complete with orientation, diagnostic, and analysis plots; as well as commentary on the observed behavior of the pressure transient tests themselves and what these pressure buildup tests may yield with regard to insight into the well/reservoir that production data in isolation cannot provide.Item Improving long-term production data analysis using analogs to pressure transient analysis techniques(2009-05-15) Okunola, Damola SulaimanIn practice today, pressure transient analysis (PTA) and production data analysis (PDA) are done separately and differently by different interpreters in different companies using different analysis techniques, different interpreter-dependent inputs, on pressure and production rate data from the same well, with different software packages. This has led to different analyses outputs and characterizations of the same reservoir. To avoid inconsistent results from different interpretations, this study presents a new way to integrate PTA and PDA on a single diagnostic plot to account for and see the early time and mid-time responses (from the transient tests) and late time (boundary affected/PSS) responses achievable with production analysis, on the same plot; thereby unifying short and long-term analyses and improving the reservoir characterization. The rate normalized pressure (RNP) technique was combined with conventional pressure buildup PTA technique. Data processing algorithms were formulated to improve plot presentation and a stepwise analysis procedure is presented to apply the new technique. The new technique is simple to use and the same conventional interpretation techniques as PTA apply. We have applied the technique to a simulated well case and two field cases. Finally, this new technique represents improvements over previous PDA methods and can help give a long term dynamic description of the well?s drainage area.