Calfee, Halter & Griswold LLP
Methods of well trajectory and drilling optimized control for fracture-vuggy carbonate formation
The invention discloses a series of methods to design drilling trajectory and control drilling operations in a optimized way in carbonate formation. The trajectory design method comprises: utilizing earthquake data to obtain contours of the carbonate rock fractures; determining a safe distance from each carbonate rock fracture; determining a segmented drilling trajectory for each fracture or vuggy structures in carbonate formation; and sequentially connecting the segmented drilling trajectories of neighboring fracture and vuggy to obtain a smooth horizontal drilling trajectory. The invention optimizes the carbonate rock reservoir drilling trajectory, thus improving connection between a horizontal well and the fractures. This reduces development costs, increases exploration and development efficiency and, at the same time, eliminates leaks resulting from the drilling process, thereby allowing for smooth drilling to a target well depth.
DRILLING RESEARCH INSTITUTE OF CHINA NATIONAL PETROLEUM COMPANY
E E E G G
E21B E21B E21B G06F G01V
inventional inventional inventional inventional inventional
Ying Xiaoqiang Lin Wei Kai Yingcao Boqi
Wang Zhai Shi Liu Wang Zhou Zhou