Critical flow rates must be maintained to keep a well unloaded. This chart is used to predict critical flow rates as a function of flowing tubing pressure and tubing diameter.

This is the first step in determining if a well is a capillary string candidate. See also Applications and Metallurgy.

Coleman Equation

Critical Flow Rates vs. Tubing ID and Ftp Liquid Phase: SG=1.08; (9 ppg) – average. Oil Field Brine

Classic Symptoms of Prime Candidates for Capillary Injection

Well begins to sweep on the charts
Tubing pressure drops below critical level
Liquid falls back
Well loads up, falls off production
Well unloads when shutting in, dropping soap sticks, or batch treating

Locations

Brochures (1)

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