Gas Lift Functions

Calculates total GLR including formation and injected gas, [SCF/STB].

Calculates gas gradient in the annulus, [psi/ft].

Calculates injection gas pressure at depth, [psi].

Calculates required gas injection rate for target GLR, [mscf/d].

Calculates absolute dome pressure at depth from surface dome pressure, real-gas nitrogen charge, [psi].

Calculates production pressure effect factor (PPEF), {1}.

Calculates valve closing pressure; equals the dome pressure for a valve without a spring, [psi].

Calculates valve spread (opening minus closing pressure), [psi].

Calculates gas throughput using Thornhill-Craver equation, [mscf/d].

Calculates test rack opening pressure at 60°F, absolute, with atmospheric pressure on the tubing side, [psi].