松软煤系地层深孔绳索取心钻探实践

长春市高家窝棚—双泉眼矿区为松软煤系地层,采用绳索取心液动冲击回转钻进方法,选择加大钻孔孔壁与钻杆环状间隙的钻孔结构;经实验选择以粘土、共聚物、植物胶、铵盐、腐植酸钾、磺化沥青、聚丙烯酸钾等材料配制的冲洗液,并加强冲洗液的日常维护管理;配备离心式除泥机;套管丝扣连接处涂抹松香(粘结剂),并用薄钢板焊接补强丝扣连接处,防止套管脱扣等技术措施,成功地完成了2个深孔的钻孔施工,终孔深度分别为1112.45 m(ZK6405孔)和1359.95 m(ZK3201孔),岩心采取率达到100%,煤心样品没有燃烧破坏现象,较好地满足了地质的要求。

Practice of Wire-line Coring Drilling in Soft Coal Measure Strata

The drilling construction of 2 deep holes was completed in a mining area of Changchun, which was in soft coal measure strata. The paper introduces the used construction method of wire-line coring with hydraulic percussive-rotary drilling and enlarged annular clearance between borehole wall and drill pipe was selected. The flushing fluid with material compounding of clay, copolymer, plant gum, ammonium salt, potassium humate, sulfonated asphalt and potassium polyacrylate was determined by experiments; daily maintenance management of flushing fluid was strengthened and equipped with centrifugal mud removal machi41ne. The casing thread connection were smeared with rosin (as plastering agent) and welded with thin steel sheet to prevent casing thread releasing. The final hole depth were 1112.45m (ZK6405) and 1359.95m (ZK3201) respectively with 100% core recovery. Coal core samples were not damaged by combustion, the geological requirement was met.