Risk Assessment of Relief Well Based on Analytic Hierarchy Process

Drilling engineering comprises a major part of production and exploration in oil fields and drilling risk is a significant ingredient to success. As one of the crucial ways to terminate oil spill event, relief well assumes great responsibility. Thus it is essential to analyze and assess the risk of relief well technique before drilling operation in order to guarantee rescue project work smoothly. Based on the Analytic Hierarchy Process (AHP) method, this paper proposed the comprehensive risk assessment model of relief well then applied the model to evaluate the drilling risk of the LW21-1-1 relief well project in South China Sea. The assessment results demonstrate that the success rate of drilling this relief well is estimated at 48.7%, providing the needed informational base to take decisions about controlling the existing risks and therefore to drastically decrease the wasted time, safe accident and direct financial losses.