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Introduction and Fundamentals
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American Petroleum Institute annulus back pressure bellows bottom calculated chart choke control closing pressure compressor continuous flow continuous-flow gas lift continuous-flow installation decrease density determined drawdown flow line flow rate flowing bottom-hole pressure flowing gradient flowing tubing pressure flowing-pressure fluid gradient ft/bbl gas injection gas pressure gas volume gas-lift equipment gas-lift installation gas-lift valve gas-liquid ratio gradient curves increase injection gas injection-gas pressure injection-gas volume intermittent gas lift intermittent installation liquid mass flow rate maximum methane minimum opening pressure operating valve permeability PISTON BELLOWS point of gas port pressure at depth pressure point pressure survey Problem Example producing rate productivity index psi/ft psia psig second valve slug solution spacing specific gravity standing valve static bottom-hole pressure static fluid level stock-tank oil surface temperature survey top valve tubing string type of valve unloading valve depth valve opens Volve wellhead tubing pressure