Causes of Abnormal Inclination Build-up and Following Techniques in ChengBei 322 Well

This paper briefly introduces the formation characteristic and the casing structure in ChengBei 322 Well, as well as downhole problems occurred during drilling through 311.2 mm section. And it also describes the causes of abnormal inclination build-up and deficiencies of using PDC bit. Some suggestions are brought forword on how to prevent from abnormal inclination build-up and how to select PDC bit in that area.