PERT based emergency disposal technique for fracture failure of deepwater drilling riser

Deepwater drilling risers are the crucial connections of subsea wellhead and floating drilling platform, and its fracture failure would lead to disastrous consequences. However, few efforts have been devoted to studying the way to efficiently and safely conduct the operation of emergency disposal for drilling riser fracture accident rescue. In this paper, program evaluation and review technique (PERT) was employed to quantitatively design the emergency disposal operation procedure of deepwater drilling riser fracture failure. The PERT model of emergency control operation for riser fracture accident were developed respectively to reflect the sequential logical relationships of each emergency disposal operation activity. Subsequently, the time parameters of operation activity for the PERT model were calculated according to the working time of each operation activity and expected completion time of the whole operation. Finally, the critical path and total duration of the emergency control operation for riser fracture accident were determined respectively, and some relevant optimization measures drawn from the results were presented to further ensure the completion of emergency disposal of riser fracture accident on schedule during drilling operations.