Mechanism and prevention method of drill string uplift during shut-in after overflow in an ultra-deep well

Hu YIN,Menghan SI,Qian LI,Hongwei JANG,Liming DAI

Table 1 Structure of the well of the fourth drilling section.

Profile name Outer dia- meter/mm Inner dia- meter/mm Beginning depth/m End depth/m Casing 196.85 171.45 0 5 250 Casing 206.38 174.38 5 250 5 909 Open hole 165.10 5 909 6 170