WHAT IS GALLOP?
• GALLOP – Gas Assisted Liquid Lift using Oscillating Pressure
• 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
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
HOW TO SPOT A LOADING PROBLEM?
• Well is approaching min-lift rates anywhere in the wellbore
• High frequency data shows surging or cycling gas rates
• Decreasing (or zero) surface liquid yield (liquids are being left downhole)
FOUR STAGES PER CYCLE
• FILL – Liquids in sump(s) fill horizontal section(s) of Dual Tubing (DT), check it 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
MORE 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
TECHNICAL SPECIFICATIONS
• Total Length – 68”
• OD – 4 3/8”
• Effecitive screen size – 4” Dia x 48” L
• Sand Screen 100 micron
• System Volume Flow Rate 3gpm
• Added Centralizers
PATENT INFORMATION
GALLOP Protected under US Patent 8794305B2 & 9435163B2
