深水半潜式钻井平台钻机选型

深水钻机是半潜式钻井平台关键设备,如何选择,配置深水钻机系统是设计与建造我国第六代半潜式钻井平台首要问题.从深水钻机并行和离线操作能力与配置、作业效率、可变载荷及专利影响等方面论证了深水海洋钻机模式选型问题.常规深水海洋钻机、离线钻机和双井架钻机结构特点、应用情况以及离线操作配置分析表明,离线作业配置越完整全面,作业效率提升越大.以甘特图和深水钻井实例详细分解、探讨双井架钻机作业机理,即在工序之间进行并行作业和工序内进行离线作业.对比分析3种深水海洋钻机钻单井、钻多井及完井作业效率,发现双井架钻机相对离线钻机和常规钻机可大幅度提高作业效率,但双井架钻机系统质量增加,且受专利影响,成本增加.采用增量净现值模型综合各种影响因素分析表明:双井架钻机总体优干离线钻机.图7表5参17

Rig mode option for semi-submersible drilling platform

Mode option of deepwater rigs can affect the configuration and construction of the 6th generation semi-submersible drilling platform in China. This paper assesses the mode option of deepwater rigs through analyzing different kinds of rigs' offline operation ability and offline configuration, working efficiency, variable deck load (VDL) and patent influence. The analysis of design, application and offline configuration of three types of rigs-single rigs, offline rigs and dual derrick rigs, reveals the relation between offline configuration and work efficiency, that is, the more complete offline equipments are, the greater the work efficiency can be improved. The mechanism of dual derrick rigs is demonstrated by Gantt chart decomposing the whole drilling procedure of a deepwater exploration well, which is current operation and offline operation. Comparing the operation efficiency of the three-type deepwater rigs in drilling single wells, multiple wells and wells completion shows that dual derrick rigs are the most efficient. VDL, construction cost, patent of dual rigs influence the choice of dual rigs. The model of net present value considering all factors is built to assess three types of deepwater rigs and shows that dual derrick rigs are better than offline rigs on the whole.