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江汉油田下第三系潜江组盐层特别发育，从潜一段到潜四段存在着大段盐岩、油浸泥岩、泥岩组成的韵律层段，以前使用牙轮钻头及常规ＰＤＣ钻头钻进该类地层，频繁地发生缩径和卡钻事故。使用偏心ＰＤＣ钻头在流动性盐岩地层中钻进，因偏心ＰＤＣ钻头能钻出超尺寸井眼，没有发生卡钻头和下部钻具组合的事故，提高了钻井速度，降低了钻井成本。
The salt layer of Qianjiang Formation in Jianghan Oilfield under the Third Tertiary has a special development. There are prosodic intervals composed of large sections of salt rocks, oil-bound mudstones and mudstones from the first section to the fourth section, which were formerly drilled with roller cone bits and conventional PDC bits Such strata, frequent shrinkage and stuck accidents. The use of eccentric PDC bits to drill in fluidized salt rock formations can lead to over-dimensioned boreholes due to eccentric PDC bits, no card-bit and lower-hole assembly accidents, increased drilling speed and reduced drilling costs.