Design of drilling engineering risk evaluation and control system and its software development

In order to improve domestic drilling risk evaluation technologies and narrow their gap from foreign level, a set of drilling engineering risk evaluation and control system integrating " risk prediction before the drilling, risk control during the drilling and risk summarization after the drilling” was developed after years’ researches, and the corresponding software was also developed. This system consists of 5 subsystems, i.e., pre-drilling description and upgrading while drilling subsystem of drilling geomechanical parameters with uncertainty, pre-drilling engineering design risk evaluation and control subsystem, drilling dynamic risk evaluation and control subsystem, post-drilling engineering risk summarization and analysis subsystem, and drilling engineering risk database subsystem. This software is available for the engineering risk prediction of downhole complexity and accident before the drilling, the engineering risk monitoring in the process of drilling and the risk summarization after the drilling, and provides the technical guidance and scientific basis for the optimal formulation of the pre-drilling drilling engineering design plan, the drilling engineering risk evasion plan and the late to-be-drilled engineering design plan.