Analysis on plastic wriggle, reduction of well diameter, bit burying, bit jamming and being difficult for casing etc. under complicated pressure system and high pressure of the extremely thick layer.

• 分析了巨厚盐膏层在复杂的压力系统及高温高压下发生塑性蠕动、井径缩小,易发生埋钻、卡钻、下套管困难等严重复杂情况;