河北省乐亭县滦河古河道深覆盖层钻探施工工艺

Drilling Construction Technology Used in Deep Overburden Layer of Luanhe Ancient Channel in Hebei

摘要:

河北省乐亭县鲁家坨铁矿区第四系、第三系覆盖层厚，基岩地层破碎，钻探施工过程中坍塌卡钻、缩径、漏涌结合等事故多。选用新型土层专用取心钻具配合常规钻头及特殊金刚石钻头钻进覆盖层，采用加大孔径、优质化学浆液护壁及护孔堵漏相结合措施用绳索取心工艺钻进基岩层，同时强化了泥浆性能调节和维护，加强钻压、转速、大泵量的监护调节等管理措施，顺利完成了施工任务。原设计孔深1300 m，实际终孔深度1408 m，钻孔弯曲度29°，岩心采取率覆盖层平均高达80%，岩层100%，矿层100%，成孔周期75天，圆满完成了设计任务书要求，评为优质孔。

Abstract:

The construction situation of Lujiatuo iron ore mine area is deep overburden layers in Quaternary and Tertiary systems, broken bedrock strata and accidents caused by collapse, sticking, diameter shrinkage and water leakage. The new special soil coring tool was selected for overburden layer drilling combined with conventional bit and special diamond bit; and wire-line core drilling technology was used for bedrock drilling with combination of enlarged borehole diameter, wall protection with high quality chemical grout and thief zone plugging. At the same time, mud performance adjustment and maintenance were strengthened, monitoring and adjusting of drilling pressure, drilling speed and pump amount were enhanced. The original designed hole depth was 1300m and the actual depth is 1408m with borehole curvature of 29°, the average coring rate is up to 80% in overburden layer, 100% in both rock formation and ore bed, the hole completion cycle is 75 days. The requirements of the design program are met and the borehole is evaluated as high-quality one.