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近年来，我队在蓟县东营房石灰岩矿层中进行钻探。钻进地层主要为微晶结构锰质、硅质灰岩，微晶结构中厚层灰岩与薄层泥质灰岩互层，灰质白云岩，圆柱叠层石灰岩，条带状硅质石灰岩，中粗粒到细粒结构的砂页岩等，偶含礈石结核或硅质条带，岩石可钻性一般为Ⅳ—Ⅵ级，少数为Ⅶ级，节理裂隙较为发育，漏失严重。使用改装的XU-600型钻机，采用上海金刚石工具厂生产的φ56普通双管天然孕镶碎粒金刚石钻头（金刚石粒度为100粒/克拉，胎体硬度HRC为39～40）和上海砂轮厂生产的人造聚晶金刚石螺旋型扩孔
In recent years, my team conducted drilling in the limestone deposit in Jixian Dongying Fang. Drilling into the strata is mainly composed of microcrystalline manganites, siliceous limestones, interbedded microlithic limestone and thin-bedded argillaceous limestone, gray dolomite, cylindrical laminated limestone, banded siliceous limestone, Medium-coarse to fine-grained sand shale and so on, with even nodular tuberculosis or siliceous bands. The drillability of rock is generally Ⅳ-Ⅵ and the minority is Ⅶ. The joint fissures are more developed with serious loss. The use of modified XU-600 drilling rig, the use of Shanghai Diamond Tools Factory φ56 ordinary double natural pregnant impregnated diamond bits (diamond particle size of 100 / carats, matrix hardness HRC of 39 to 40) and the Shanghai Wheel Factory production Artificial polycrystalline diamond spiral reaming