GALLOP

About

Gas Assisted Liquid Lift using Oscillating Pressure (GALLOP is a dual tubing system with check valve(s) that can lift liquids from multiple points in a horizontal well bore without putting lift pressure on the formation. GALLOP is designed for wells approaching min-lift rates anywhere in the wellbore, wells with high frequency data shows surging or cycling gas rates, or wells with decreasing (or zero) surface liquid yield (liquids are being left downhole).

Features & Benefits

GALLOP can defer P&A on problem wells
Ability to monitor performance in real time as cycle times are tuned
Keeps reserves on the books
Production pays for the system costs

Well Selection Criteria

Target liquid rates less than 50 BLPD
Access to lift gas at pressures suitable for GALLOP
Low solids production, low chance for future frac interference
Uplift potential if well could be “pumped off”
A Sucker-Rod pump below the perfs in a vertical
Existing tubing preferred

Four Stages of GALLOP

Fill: Liquid in sumps fill horizontal sections of Dual Tubing, check is open
Gas Injection: Pressurized gas is injected into one side of DT, check closes
Liquid Production: Lift gas drives liquid slug to surface, check closed
Blow Down: DT pressure is relieved to flowline, check re-opens

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