HIGH ANGLE MULTI-TARGET DIRECTIONAL WELL DRILLING IN LONG OPEN HOLE

Well Zhang-1102 and Zhang-1301 are two directional wells of long open hole, high inclination and multiple targets in Henan Oilfield, Zhangdian area. The total depths range from 2430m to 2500m, with the highest inclination up to 72°, and precise target hitting is required. The geology design, drilling engineering plan, well stabilization and trajectory control programs for the two wells are introduced.Five-section profile is adopted for both wells.Bottom Hole Assembly in the two wells combines the use of dual-stabilizer with short drill collar.As for drilling fluid system,low solid content and non-dispersion inhibitive polymer drilling fluid is used,and temporary shield plugging technology is carried out for formation protection.Drilling practice offers some successful experience for developing such similar reservoirs.