The Backside Auto - Injection System (BAIS) is designed to allow gas to be injected into the packerless production tubing/casing annulus intermittently without having to pull the tubing and install gas-lift mandrels and valves. This is accomplished by using a single portable wellhead compressor to collect gas from the tubing and simultaneously compress the gas down the casing-tubing annulus. The control of gas flow is directed by pressure activated motor valves. As the gas enters the bottom of the tubing, the gas-liquid ratio (GLR) is increased sufficiently to unload the wellbore liquids to the surface. Once unloaded, the gas flow is directed to sales until further loading is detected by the BAIS. This system is designed to provide liquid unloading and economic production enhancement to marginal gas wells.

Keywords:
production monitoring, Upstream Oil & Gas, gas production, production control, compressors engines and turbines, Reservoir Surveillance, line pressure, MCFD, artificial lift system, gas Well Deliquification
Subjects:
Artificial Lift Systems, Well & Reservoir Surveillance and Monitoring, Processing Systems and Design, Improved and Enhanced Recovery, Gas well deliquification, Production logging, Compressors, engines and turbines, Well Intervention
Copyright 2009, Society of Petroleum Engineers
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