关键词: 深水钻井, 喷射安装, 管柱力学模型, 抗拉强度, 钻柱设计

Abstract:

Based on the features of load and boundary conditions in jetting operation of conductor under deepwater condition, a tubular mechanic model was established, which was solved by weighted residual method to calculate the change regulation of tubular deformation and stress distribution associating with the environment load, tubular composition and drill ship offset. The middle-deep ocean currents have great effect on the deformation of pipe string. The design of drill string composition and control of drill ship offset are important for the successful operations of conductor in deep water. The bending normal stress of drill string is significant at both ends of tubular, so it should be considered in the tension strength design of drill string. A suitable drill string composition is suggested to be used in deep-water jetting operations. In the primary stage of operation, the offset of drill ship to the negative direction of sea current benefits to control the dip angle of conductor. The maximal axial stress in dangerous section of pipe string can decrease when the offset inclines to the positive direction of sea current while working the pipe under the resistant state.

Key words: deepwater drilling, jetting operation, tubular mechanic model, tension strength, drill string design