During the trial production period of Tazhong Oil and Gas Field development， some scattered trial production wells will vent gas. Along with rapid economic development in China， energy shortage is becoming increasingly severe. Recovery of the vented gas can enhance gas supply capacity， and also can save energy sources and reduce environmental pollution. To achieve this goal， through field researches and practices， formed are a series of gas recovery technologies， in which adopted are a set of skid-mounted modular processing units and the processing units are skid-mounted according to such three grades as 2×104 m3/d， 3×104 m3/d and 5×104 m3/d. If output of trial production wells drops， such skid-mounted units can be recombined and relocated to a new well site in a short time for reusing. In field application of nearly three years， these skid-mounted units operate normally and have recovered 2.9×108 m3 natural gas in total. Successful application of the technology can provide a valuable reference for future similar gas field development.