Sucker rod pumping is one of the major oil recovery systems in the Appalachian area. In order to analyze the performance of a pumping well, the bottomhole condition of the well should be monitored. The pressure at the formation in a well should be known at different conditions. In addition to determining the producing and static bottomhole pressure, the study of the pressure build-up when a well is shut-in is important. There are several methods for obtaining this pressure build-up data. The acoustical liquid level instrument has been traditionally used to locate the liquid level to determine if the well is "pumped off". The depth to the liquid level can be used to calculate the producing bottomhole pressure. The same calculation can be utilized to monitor the bottomhole pressure during a well test. These pressures may then be used to determine the skin damage present in a well. Substantial work is now being done by several companies with acoustical build-up tests. This paper reviews skin damage and the application of methods to test for its presence.

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