REVIEW ON PRESENT SITUATION AND DEVELOPMENT DIRECTION OF SPECIAL LINER HANGERS IN CHINA

To meet the requirements of liner cementing in horizontal wells, multilateral wells, extended reach wells, slim holes and complex condition holes, new types of special liner hangers have been developed and applied in China in recent years. These new types consist of liner hanger integrated with hanger and packer, which is used to improve cementing quality at the liner laps and stop oil/gas/water channeling and migration, together with the tie-back devices; double-action liner hanger integrated with hydraulic and mechanical functions; super sized and heavy load liner hanger for deep well drilling; small sized liner hanger suitable for sidetracking in cased wells; special liner hanger which is subject to CO2 and H2S corrosion and liner hanger for horizontal completion, etc. These special liner hangers have been successfully used in onshore and offshore oilfield completion.