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Title: Methods Of Rating Gas Wells
Author: A. F. Bertuzzi
Source: 1970 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1970
Abstract: Gas wells are rated on the basis of their ability to produce. This ability to produce is determined by back pressure tests and expressed on log-log paper as a plot of the difference in shut in pressure squared and flowing pressure squared on the vertical axis against flow rate corresponding to the flowing pressure on the horizontal axis. The pressure information may be based on well head conditions or bottom hole conditions. If it is bottom hole conditions, the pressures may be measured or calculated from well head conditions. Figure 1 is an example of such a plot. This concept in testing gas wells is based on the work of E. L. Rawlings and M. A. Schellhardt which appeared in their 1935 Bureau of Mines Monograph 7 publication entitled Back-Pressure Data on Natural Gas Wells and Their Application to Production Practices.1

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