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A system of risk incentives and weight analysis of well control for high-pressure hydrocarbon exploratory wells

Jing Yequan,Liu Gang,Ji Yongqiang(China University of Petroleum,Qingdao,Shandong 266580,China)  
Downhole accidents such as overflow,kicks,blowouts,etc.will so often occur in those high-pressure oil and gas exploratory wells that the assessment of risk incentives is the basic work in well control to reduce the accident rate and losses.To this end,in combination with the analytic hierarchy process,the identification and classification of risk incentives were made according to the investigation and analysis of different cases in fields;on this basis,an incentive structure system was established for high-pressure oil and gas exploratory wells and the all-level incentive weights were calculated.The results in agreement with the actual fields show that among all the 31 risk incentives,the weights of gas zone,pumping and well control equipment are summed up to be above 0.4,so these three incentives are the main factors affecting the well control safety.This study provides the quantitative theoretical basis for accurate identification and effective control of risks in well control for high-pressure oil and gas exploratory wells.
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