Application of Oil-in-water Drilling Fluid in Horizontal Section of Well CFD18-1-A2h

Basal glutenite and burial hill of the Member 2 of Dongying Formation of Paleogene was drilled in the horizontal section of Well CFD18-1-A2h,where fractures developed,the formation temperature is high,reservoir protection and conventional drilling operations are difficult.Since the oil-in-water drilling fluid has such advantages of low density,small fluctuations in bottomhole negative pressure value,strong stability,good lubricating effect,and less pollution to reservoir,so the horizontal section of Well CFD18-1-A2h is drilled using oil-in-water drilling fluid combined with managed pressure drilling technology.During drilling and completion,oil-in-water drilling fluid is steady,ROP is high,trip-in is normal,and screen is inserted to target depth.Flowing production of is 200% of ODP and reservoir is protected well.