Risk Identification And Evaluation Of The Underbalanced Drilling Operation

Nowadays it is more and more difficult to explore and develop oil and gas,underbalanced drilling technology with its unique advantages has become one of theimportant methods for oil and gas exploration and development.Underbalanced drillingoperation has a lot of risks because of massive complex and uncertain factors.How to reducethe risk of underbalanced drilling operation and gain the best benefits is a question whichneeds to be resolved as soon as possible.Evaluating various risk factors can forcast accident’ssymptom, provide policy decision for controlling risks effectivly by driiling builder.The risk of underbalanced drilling Operation has the characteristics of stage,differenceand complexity,it is not only need to analysis single risk factor but also need comprehensiveanalysis.According to underbalanced drilling’s staggered and subsequent quality,and othercharacteristics,take the five factors-natural conditions factors,engineering factors,technologyfactors, equipment factors,management factors and economic factors as the main evaluationfactors of underbalanced drilling task’s risks evaluation system,then21specific indexes aregot from further dividing the five core factors and carry out qualitative description andquantitative treatment for grading standard of each index.Using the scientific methods,identificate and estimate various risk factors of oil drilling project cost system.Using theFuzzy-AHP analysis method to evaluate the risk of underbalanced drilling operation thatbased on its characteristics,in order to raise the level of management,reduce accidentfrequency,exert its technology advantage, improve successful rate of the driiling mission.