CEMENTING TECHNOLOGY USED FOR PREVENTING GAS CHANNELING THROUGH THE PRODUCTION CASING ANNULAR

Considering the complex geological formation in East Sichuan area,and such conditons as great well depth,high pressure,large gas prodution and multilayered reservoirs,the paper domenstrated the reasons causing gas channeling through production annular,and according to the gas channeling prevention theory and field practical exeprience,drew out a series of technology suitable for this area. The key include:First to develop and select cement additives with stable quality and perfect performance, which is suitable for gas channeling perevention technology;Second to increase the displacement effiency and control the reservoir during cementing.