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小口径人造或天然金刚石钻进,是我国目前地质勘探大力提倡的新钻进方法.影响它迅速推广的主要障碍之一,是复杂地层护壁堵漏问题.它与91～150毫米大口径岩心钻孔的护壁堵漏相比,问题更为突出,这是由于小口径钻孔的一系列特点所造成的.从国内外的实际情况可以看出,当前解决小口径钻进复杂地层的护壁堵漏问题,仍同大口径的岩心钻探一样,以泥浆护孔和水泥护孔为基本手段,其它如化学浆液护孔等,只不过是辅助手段.泥浆护孔有其优越性.譬如,它可以在连续作业中对付不断出现的孔壁不稳定情况,保证安全钻进;同时又能解决较轻微甚至是中等的漏失问题.而小口径金刚石钻进应用泥浆,
Small-caliber artificial or natural diamond drilling is one of the most important new drilling methods advocated by China’s current geological exploration, and one of the major obstacles that affect its rapid promotion is the blocking of the stratum in the complex formations, which is compatible with large-diameter core drilling of 91-150 mm Hole wall plugging, the problem is more prominent, which is due to a series of characteristics of small borehole caused by the actual situation from home and abroad can be seen, the current settlement of small-borehole into the complex formation of the wall plugging The problem is still the same as the large-diameter core drilling, which is based on the masonry and the concrete retaining holes, and the other such as the chemical grout guard hole etc. The mud guard hole has its advantages, for example, Continuous operations to deal with the ongoing instability of the hole wall to ensure safe drilling at the same time can solve the minor or even the problem of leakage and small diameter diamond drilling application of mud,