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Well-Performance Study Integrates Empirical Time/Rate and Time/Rate/Pressure Analysis

The purpose of the complete paper is to create a performance-based reservoir characterization by use of production data (measured rates and pressures) from a selected gas-condensate region within the Eagle Ford Shale. The authors use modern time/rate (decline-curve) analysis and time/rate/pressure (model-based) analysis methods to analyze, interpret, and diagnose gas-condensate well-production data. Reservoir and completion properties are estimated; these results are then correlated with known completion variables. The time/rate and time/rate/pressure analyses are used to forecast future production and to estimate ultimate recovery.

Production-Analysis Work Flow

The data required for the completion of the proposed methodology include well-history files, daily-rate and flowing-pressure measurements, and laboratory pressure/volume/temperature (PVT) and fluid-analysis reports. The following diagnostic plots are used to identify potential errors or abnormalities in the production data:

  • Rate/pressure/time plot (semilog)
  • Productivity-index/time plot (semilog)
  • Productivity-index/time plot (log-log)
  • Rate/cumulative-production/time plot (log-log)
  • Pressure/rate correlation plot (Cartesian)
  • Rate/pressure/cumulative-production plot (semilog)
This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 179119, “A Well-Performance Study of Eagle Ford Gas Shale Wells Integrating Empirical Time/Rate and Analytical Time/Rate/Pressure Analysis,” by A.S. Davis and T.A. Blasingame, Texas A&M University, prepared for the 2016 SPE Hydraulic Fracturing Technology Conference, The Woodlands, Texas, USA, 9–11 February. The paper has not been peer reviewed.
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Well-Performance Study Integrates Empirical Time/Rate and Time/Rate/Pressure Analysis

01 February 2018

Volume: 70 | Issue: 2

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