Drilling technologies used in ADMa-1H Well,an extended-reach horizontal wells in AHDEB Oilfield

ADMa-1H Well is the first extended-reach horizontal well in AHDEB Oilfield of Iraq. Till now, its horizontal section length is the longest, and its vertical depth also is the greatest in all completed horizontal wells. It makes a new record in which a set of normal MWD tools and screwdrill were used to drill a horizontal section of ?152.4 mm with a length of 1 500 m. In view of some difficulties in extended-reach horizontal wells, such as well trajectory control, high drag and torque in horizontal section, easy fluid loss and stuck pipe, etc., through wellbore configuration design optimization, BHA and drilling parameter selection and research in well trajectory control technology, we finally realized high quality in the whole wellbore of ADMa-1H well with no occurrence of downhole troubles. The success of this well provides precious experience for drilling of extended-reach horizontal wells in AHDEB Oilfield.