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Title: Back-Pressure Tests Of Gas Wells
Author: T. W. Johnson
Source: 1940 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1940
Abstract: The determination of the delivery capacity of a gas well at various back-pressures is a relatively simple operation and the data so obtained are fundamental in the study of many problems connected with the production of natural gas. These data describe the characteristics and performance of the individual well and are fundamental in that they relate the characteristics of the reservoir itself. The usual procedure for determining the relationship between the rate of flow and back-pressure against the sand consists of first measuring the shut-in well-head pressure after the well has been closed in sufficiently long to stabilize the pressure. The well is then produced at several different rates of flow and after stabilization of each rate the wellhead pressures are again observed. The determinations of the rates of gas delivery from the well may be made bjany acceptable method of measuring gas volumes often it is possible to use the orificc-meter equipment normally serving the well and during the periods of testing to deliver the gas to a pipe-line system thus eliminating gas wastage. For the well-head pressures observed under static conditions and at several different measured rates of production the corresponding pressures at the bottom of the well are computed. In general, there are two factors which must be added to surface pressures observed under flow conditions to obtain the absolute pressure at the sand face (P ) first, pressure due to the weight of the column of gas and second, pressure due to friction in the flow string. When the production is through tubing and the pressures are taken on the casing, the calculations are simplified in that only the

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