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在裂缝性页岩钻井过程中,如果出现井壁失稳现象,单纯提高钻井液密度重新使井眼达到稳定状态,会造成如压差卡钻、降低钻进速度等一系列工程问题,更严重的是如已揭开油气层,会对油气层造成严重的伤害。针对辽河油田雷家地区井壁失稳现象突出的问题,利用自主研发的处理剂形成了一套全油基钻井液体系,通过页岩膨胀率、滚动回收率、砂床实验以及三轴压缩实验等方法对全油基钻井液的抑制性、封堵性及保持页岩强度能力进行了评价。结果表明:自主研发的全油基钻井液体系能够有效抑制页岩水化膨胀,封堵地层微裂缝,对页岩强度有很好的保持能力。在高28井施工过程中,全油基钻井液性能稳定,井壁稳定,符合现场施工要求。
In the process of fractured shale drilling, if the instability of the borehole wall occurs, simply increasing the drilling fluid density and re-establishing the wellbore will result in a series of engineering problems such as differential pressure sticking and lowering of the drilling speed and more serious If the reservoir has been opened, it will cause serious damage to the reservoir. Aimed at the prominent problems of borehole instability in LJ area of Liaohe Oilfield, a complete oil-based drilling fluid system was formed by using self-developed treatment agent. Through the shale expansion rate, rolling recovery rate, sand bed experiment and triaxial compression experiment And other methods of oil-based drilling fluid inhibition, plugging and shale strength to evaluate the ability. The results show that self-developed oil-based drilling fluid system can effectively inhibit the hydration expansion of shale, seal the micro-cracks in the formation and maintain the shale strength well. During the construction of Well 28, the oil-based drilling fluid has stable performance and stable borehole wall, which meets the requirements of on-site construction.