Power-V在克深102井膏盐岩层中的应用

Application of Power-V in gypsum-salt rock

库车坳陷克拉苏构造带富含古近系膏盐岩层,该岩层发育复杂,含有夹层,地层倾角大,易发生井斜、卡钻、井漏等事故,是中国陆上钻井难度最大、难题最集中的地层之一。因此,安全快速钻穿膏盐岩地层,揭示膏盐岩地层以下的储集层含油气情况,避免钻井周期延误、井眼报废的严重后果已成为亟需解决的问题。在克深102井钻进过程中,尝试在膏盐岩层中使用Power-V钻进方式,既有效地控制了井斜以保证井身质量,又大幅度提高了机械钻速。论述了Power-V在钻遇膏岩层时应使用的工程手段,以避免蠕变效应引起卡钻事故。

Kelasu tectonic zone in Kuqa depression contains the gypsum-salt rock of paleogene system. This rock stratum has gone through complicated development, contains interlayer and large inclination angle, is vulnerable to accidents such as hole deviation, bit jamming and well leakage, and is one of the formations with the highest drilling dififculty and the most problems in China. Therefore, to safely and quickly drill through the gypsum-salt rock, discover the oil/gas bearing situation in reservoir under gypsum-salt rock, and avoid the serious consequences such as delay of drilling cycle and borehole scrap has become the issue to be settled, In the course of drilling operation of Well Keshen 102, the Power-V drilling method has been applied in the gypsum-salt rock. It has been proven that it is feasible to use the Power-V drilling method in gypsum-salt rock, which can not only effectively control the hole deviation so as to guarantee the wellbore quality, but also greatly increase the mechanical drilling speed. The engineering approach should be used when the gypsum-salt rock is encountered in the course of Power-v drilling operation, so as to avoid the jamming accident caused by creep effect.