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冀东矿区基岩几乎全被第四系覆盖,一般厚60～80米,最厚达500米,其中有卵石层,厚40～90米,易坍塌掉块,卵石为石英岩、石英正长岩、石英砂岩,质坚硬,是该矿区最难钻的地层;粘土层虽然能形成孔壁,但缩径、岩心膨胀、易糊钻憋泵、烧钻、埋钻;砂层松散,难形成孔壁.另外,该区近临渤海,跨滦河,地下水丰富,水位一般2～3米,整个卵石层为含水层,有时漏水,有时涌水.因此,在钻进时必须采取严密的技术措施.华北冶金地质勘探公司五一四队、五一
The bedrock of Jidong Mining Area is almost completely covered by the Quaternary. The thickness of the bedrock is generally 60-80 meters and the thickest is 500 meters. There is a pebble layer which is 40-90 meters thick and is easy to collapse and collapse. Pebbles are quartzite and quartz is Rock and quartz sandstone are hard harder and the most difficult formations in this mining area. Though the clay layer can form hole wall, the diameter of the clay layer expands and the core expands. Hole wall.In addition, the area near the Bohai Sea, across the Luan River, rich groundwater, water level is generally 2 to 3 meters, the entire pebble layer aquifer, sometimes leaking, and sometimes gushing water.Therefore, when drilling must take strict technical measures North China Metallurgical Geological Exploration Company May Fourth Team, May 1