Key Technologies and Applications of Surface Drilling in Shallow Extended Reach Wells
The use of seawater for surface drilling has become a commonly used technique for both offshore conventional and directional wells,and seawater deep drilling technology is also commonly used to achieve safe and efficient drilling in high-deviation wells.However,the use of seawater drilling technology for shallow-depth high-deviation wells is still immature.In the Enping oilfield,shallow-depth high-deviation well drilling faces several challenges including soft geological formations,water leakage in the casing,difficulties in controlling the wellbore trajectory,poor cleaning of the wellbore,risk of keyholing,drilling torque issues,high friction during casing installation,and difficulties in achieving a high cementing height.To address these challenges,a comprehensive set of techniques and strategies were developed through the optimization of wellbore structure,directional drilling tools and parameters,drilling fluid management,top pushing technology for casing installation,and cementing operations.This optimized technology package developed for the Enping oilfield is expected to serve as a reference and guide for shallow-depth high-deviation well drilling in other offshore oilfields.
shallow-depth large-deviation wellsoffshore drilling with seawatercomplementary technology
万方数据
维普
