The design, operation, and value derived from a wellhead electronic flow measurement (EFM) system recently installed in the Belle River Mills (BRM) gas storage field in southeastern Michigan are discussed. The automated process of corporate data integration to identify problem wells on a daily basis is presented. Four specific examples are cited which demonstrate the value of such a system: immediate identification of operational problems occurring during routine operations which rendered several 35 MMSCFD wells inoperable; empirical assessment of the impact of subsurface safety valves on well deliverability; pressure transient analysis using wellhead data collected at 10-second intervals during routine operations; automated daily assessment of individual well performance to alert operators of deteriorating well performance. The potential to monitor inventory using EFM data and pressure transient analysis techniques is discussed, including the difficulties encountered when using wellhead data for such analyses.

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