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SOA1
'After the swabbing is completed, a plunger lift system will then be used to continuously lift fluid from the wellbore.'
Plunger lift
Plunger lift has become a widely accepted and economical artificial lift alternative, especially in high-gas/liquid-ratio (GLR) gas and oil wells (Fig. 1). Plunger lift uses a free piston that travels up and down in the well’s tubing string. It minimizes liquid fallback and uses the well’s energy more efficiently than does slug or bubble flow. As with other artificial lift methods, the purpose of plunger lift is to remove liquids from the wellbore so that the well can be produced at the lowest bottomhole pressures.
Benefits and applications
A plunger changes the rules for liquid removal. In a well without a plunger, gas velocity must be high to remove liquids,[19] but with a plunger, gas velocity can be very low.[10][11][12] Thus, the plunger system is economical because it needs minimal equipment and uses the well’s gas pressure as the energy source.[13][14][15] Used with low line pressures or compression, plunger lift can produce many types of wells to depletion.[11][13][6]
Improvements
Plunger lift improvements have enabled its use for a broader range of well types and conditions, allowing its application even in extremely low-pressure wells (< 100 psia), wells with high liquid production (> 100 B/D), deep wells (16,000+ ft), slimhole wells (2 7/8- to 3 1/2-in. casing), and wells with packers. Operators have successfully used plunger lift in paraffin-, scale-, sand-, and hydrate-production environments.
