An intelligent identification method of safety risk while drilling in gas drilling

HU Wanjun,XIA Wenhe,LI Yongjie,JIANG Jun,LI Gao,CHEN Yijian

Table 6. Comparison between identification results and monitoring results in Dayi Well A

Well depth/m Monitoring report and expert conclusion Risks produce probabilistic of intelligent identification results/% Formation gas production Formation water production Sticking Connecting column 5149.22 Formation gas production 97.25 1.71 0 0 5173.06 Connecting column 0.14 1.58 0 99.44 5174.45 Formation gas production 99.34 1.78 0 0 5133.02 Connecting column 0.96 2.61 0.02 99.98 5250.62 Formation gas production and sticking 98.80 46.13 99.92 0 5251.64 Formation water production 3.48 85.34 2.22 0 5254.58 Formation water production 4.15 83.54 0 0 5254.69 Sticking drill 1.52 29.02 96.54 0