浅析水平定向钻泥浆固孔技术

Mud Slurry Reinforced Drilling Borehole Technology in Horizontal Directional Drilling

定向钻穿越过程中的泥浆功用主要是悬浮和携带泥(岩)屑、润滑和冷却钻具、稳定孔壁、软化和辅助破碎岩土、传递动力。该文主要介绍了定向钻穿越工程中采用相应有效的泥浆固孔技术,成功在长江三角洲冲积平原类地层中,克服了结构松散,吸水较强,定向钻穿越时易冒浆,穿越管径大,扩孔级数较多,对地层的冲击扰动较大,增加了塌孔的可能性等不利因素,顺利完成了穿越任务。

The main functions of mud slurry during directional drilling are suspending and carrying mud（rock） slack,lubricating and cooling drilling,stabilizing borehole wall,softening and crushing rock indirectly,and passing power as well. Since Shenjiadai is in the Yangtze river delta alluvial plain with loose geological structure which is easy to absorb water,and leak mud out during directional drilling crossing,and also the larger the pipe diameter,the more times reaming,make more impacts to the stratum,so the possibility of borehole collapse increases etc.All the unfavorable factors have been overcame in the course of operation,the directional drilling crossing project is successfully finished.The mud slurry reinforced drilling borehole technology is introduced in directional drilling project in the paper.