Abstract
Summary This paper outlines a continuous-flow installation design procedure that uses the performance characteristics of singleelement, nitrogen-charged, injection-pressure-operated (IPO) gas-lift valves (GLV's). The Appendix gives a mathematical performance valve model for calculating the gas rate through GLV's as a function of the change in the injection-gas pressure at depth, pioD. Although several simplifying assumptions are made for the model, the calculated performance illustrates realistically the backpressure regulation of a typical unbalanced IPO GLV compared with a fixed orifice. The GLV depth spacing procedure requires matching the injection-gas-rate throughput of the IPO GLV with the total gas required to establish the unloading flowing-production-transfer pressure, pptD, at each valve depth to uncover the next-deeper valve. The GLV performance curve defines the injection-gas rate through an IPO GLV, and the tubing performance curve defines the total gas rate to establish the pptD at each valve depth. This paper gives a detailed installation design example. The GLV and tubing performance curves for spacing the valves are plotted for each valve depth.
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