Abstract: In this paper,the synthetic assessment analysis of multi-factors for risk of extended reach drilling technique is presented in order to set up the model of function evaluation coefficient systems and this model is solved by the model of function evaluation coefficient system and the science basis is provided for setting up the model in this paper.The relation among the risk and many factors is described in order to take up the foundation for solving the model by this risk evaluation model.An example shows that this method is available,it is made for evaluating and averting from the risk of extended reach drilling technique and a mathematical model to do easy is provided for engineers.

Key words: extended reach, drilling technique, risk analysis, mathematical model, synthetic evaluation model

摘要： 提出了大位移井钻井技术风险的多因素综合评价方法,以功效评价系数体系建模,并实现了对该模型的求解.文中系统研究了功效评价系数体系,为建模提供了科学依据.所建立的风险评价模型,阐明了多因素与风险的关系.通过对典型实例的分析,说明本文方法切实可行,有助于大位移钻井技术风险评价与防范,并为工程师提供了一个便于操作的风险评价定量化模型.

关键词: 大位移井, 钻井技术, 风险分析, 数学模型, 综合评价