Abstract
Summary Although gas lift design has been practiced for many years with the use of the Thornhill Craver (TC) equation (Cook and Dotterweich 1946) to predict the rate of gas passage through a gas-lift-valve port, the equation and charts were never intended for use with live gas lift valves. It is now possible to obtain tested valve-gas-passage-performance data for any pressure and temperature conditions. To date, a method has not been provided for the use of this information during the design stage. This paper will show how tested valve-performance data can be used in the design of 1-in. (25.4-mm) injection-pressure-operated (IPO) gas-lift valves.
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