Risk Assessment On Tripping Operation Based On Process-Knowledge Management

This paper aims at raising the level of risk management to avoid accidents through introducing the process-knowledge management(P-KM) into evaluation of the risk of drilling operations. Paper discusses on the identification and control of the drilling operation harmful factors mainly on the stage of tripping operation,the establishment and the application of proper risk assessment model,the establishment of the comprehensive database and the design and implementation of the risk assessment software system based on the P-KM. First the meaning and background of the assessment system is introduced, the research and development of safety assessment,oil and gas drilling project and knowledge management system being outlined and then the process of drilling operations and possible incidents are analyzed in detailed and the existing risk factors,hazardous and accidents are identified through the associating chart analysis. Several evaluation methods applicable to the drilling operating system has been determined and applied in details based on the study of the safety evaluation methods. Through research, the main reasons for the accidents and failure characteristics of the tripping are identified and the corresponding concrete risk assessment system software has been prepared. The whole drilling risk assessment system is made up of the evaluation system of the process of preparation before drilling,drilling,tripping and so on and integrated database component. With the expression of knowledge by production rules and the introduction of a precise method of reasoning, through the application of a variety of evaluation methods, the existing empirical knowledge is exchanged into a systematic knowledge in the knowledge base. After a sequential reasoning mechanism, the initial information which users input and the usage of knowledge in the knowledge base, reasonable results are reasoned. The main system functions of this software are realized with Visual Basic. Finally, objective, comprehensive evaluations to the system are given.