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Title: Methods Of Rating Gas Wells
Author: R. V. Smith
Source: 1967 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1967
Abstract: There are two general types of well tests used for the rating of gas wells. The multipoint type test is conducted by flowing the well at various rates in succession without shutting in the well between rates of flow. The isochronal type test is conducted by flowing the well for periods of time at various rates of flow after the well has attained a stabilized shut-in pressure before each flow rate. A multipoint test is sometimes referred to as a flow after flow or, as a three, four, or five point test depending upon the number of rates of flow used in the multipoint test. A one-point test (for the purpose of this paper) means that the well was started from shut in at a predetermined rate of flow and allowed to produce for an extended period of time. A one-point test as well as the first point (or first rate of flow) of a multipoint test is by definition of the isochronal type since both flow rates begin with the well in a shut-in status. The multipoint test differs from the isochronal test in that each successive flow rate after the first, is imposed upon the well without shutting in the well. Deliverability tests are usually one-point tests run under conditions specified by a regulatory body, and the results are usually corrected by calculations to a specific set of conditions. All of the testing described above is of the back-pressure type in that the well is not opened directly to the atmosphere and allowed to flow without restriction.

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