Application of drainage gas recovery technology for Su-1 buried-hill of Huabei Oilfield

Accordance with characteristics of deep burial gas reservoir, high temperature, most wells at mining with water stage, different wellhead pressure, small drainage amount and high condensate yield of Su 1 buried hill, optimal selection of gas lift as leading drainage gas recovery technology of recovering production of gas well, choice of open and positive gas lift mode of continuous gas lift technology , use of gas lift technology compressor, unbalanced corrugated pipe casing pressure control bias gas lift valve, 73 mm thickening working barrel and 60.3 mm flat working barrel, gas recovery and transmission equipment and water treatment, and adjustment of optimization of pipe string combination of gas injection technology and optimization of gas injection parameter are done. Since 2000, the said technology has been implemented in 5 wells of Su-1 buried-hill, resulting in production up to 1323 t, natural gas yield increasing by 2345.75×104 m3, oil increasing 1323 t, liquid drainage accumulated to 2.794×104 m3 and saving amount of gas injection accumulated to 336.1×104 m3 of 5 wells. Implementation of technology for drainage and gas recovery of gas lift effectively ensures gas production ability of gas reservoir improves gas recovery rate of gas reservoir.