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我队在石墨矿进行钻探工作。由于火成岩体侵入，矿区地质构造复杂，地层产状陡、变化大，岩石软硬互层，破碎、裂隙发育，钻进中出现坍塌、掉块、漏失、缩径等复杂情况，特别是高铝页岩层厚达一百多米，膨胀缩径十分严重，被视为拦路虎。以往在该矿区工作的地质队也从未钻穿这一层。我队施工的第一个钻孔，钻进至270米深度亦因缩径埋钻，加上处理不当而报废，造成人力物力的损失。通过学习兄弟队的经验及我们反复摸索，选用了矿区附近质量较好的粘土，配制使用优质泥浆护壁等一些措施，现
My team drilled in graphite mine. Due to the intrusive igneous body, the geological structure of the mine is complex, the formation is steep and varies greatly, and the soft and hard layers of the rock are interbedded, fractured and fractured. During the drilling, there are complex situations such as collapsing, dropping, leakage and diameter reduction, Shale thickness of more than 100 meters, expansion diameter is very serious, was seen as stumbling block. Geological teams that used to work in this area have never drilled through this layer. The first hole drilled by our team, drilling to a depth of 270 meters, was also scrapped due to diameter reduction burial, coupled with improper handling, resulting in loss of manpower and material resources. By learning brothers team experience and we repeatedly explore, choose the better quality clay near the mine, the preparation of the use of high-quality mud retaining wall and some measures are