Key Technologies for the Design of Kilo-Ton Heavy-Duty Ultra-High Derrick Substructure

To meet the demands of exploration and development of 10 000-meter ultradeep wells， research on key technologies for the design of kilo-ton heavy-duty ultra-high derrick substructure was conducted. After analyzing the functional requirements and key technical problems to be solved of the heavy-duty ultra-high derrick substructure， the main technical parameters and structural scheme of the heavy-duty ultra-high derrick substructure were determined. The derrick adopts a front-opening K-shaped structure， with an effective height of 61 m and a maximum rated static hook load of 11 250 kN， and the overall rotational hoisting is carried out using wire ropes. The substructure is divided into front and rear floors. The front floor is a parallelogram structure with a height of 15 m， and the equipment on the floor can be installed when the substructure is located at a low position， and then raised to the working position via hydraulic cylinders for overall rotational hoisting. The rear floor is used to place equipment such as drawworks. Moreover， the key technologies for the design of heavy-duty ultra-high derrick substructure were systematically summarized， including the design technology of derrick substructure hoisting system， analysis technology of derrick substructure stability and structural optimization technology of derrick substructure. The research results provide reference for the development of the supporting derrick substructure of 10 000-m drilling rigs in China.