Application of coiled tubing service technology in shale gas wells

Recently，coiled tubing (CT) service technology and service from abroad has been used for developing Shale Gas Field of China.With deeper shale gas wells，it’s harder for CT operational technology and it’s urgent to optimize a set of domestic CT technology.With features of shale gas wells such as long lateral，many stages，high operational pressure and more friction & hard for fishing，through continuous research this paper optimized for CT，down hole tools and ground equipment，and optimized a set of technology suitable for drilling & milling and clean borehole with CT.Field application in more than 100 wells demonstrated that a series of new index were developed including drilling & milling rate of bridge plugs raised to 100%，plugs drilled & milled in single well came up to 29，bridge plugs drilled & milled in one trip amounted to 20.