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小口径金刚石取心钻进多孔段裂隙渗漏的复杂地层,是当前的一个技术难题。河北省地矿局地质六队木吉村矿区7402号孔,采用φ56毫米口径金刚石绳索取心、优质泥浆钻进,自孔深172米以下出现裂隙性渗漏和涌水,孔深200米后,渗漏严重,拟通过提高泥浆粘度处理孔内坍、掉及涌漏,但由于绳索取心钻具与孔壁环状间隙小,冲洗液回返速度快,以及钻具回转离心力的作用,致使泵压升高,管内结垢,影响了继续钻进和内管打捞。在孔深158～196,280,310米等处,曾采取灌注水泥、水玻璃速凝堵漏液等措施堵漏,效果也不明显。同时,由于岩层破碎,裂隙性漏失经常发生,用上述方法堵漏,常要停钻而影响生产。因此,一直在使用优质低固相泥浆顶漏钻进(漏失量为1.3～1.5米~3/时),不仅待浆时间长,而且泥浆费用高。
Small caliber diamond core drilling complex porous formation fissures seepage, is a current technical problems. Hole No. 7402, Gejiura Mining Area, Geological Team, Bureau of Geology and Mineral Resources of Hebei Province, bore holes of φ56mm diameter diamond ropes and drilling for high-quality mud. Fissure seepage and gushing appeared below 172m of hole depth. After hole depth of 200m, seepage It is proposed to deal with the slump, loss and gushing by increasing the viscosity of the mud. However, due to the small annular clearance between the cord coring tool and the hole wall, the quick return of the rinsing liquid and the centrifugal force of the drilling tool, the pump pressure is increased , Tube scaling, affecting the continued drilling and internal tube salvage. In the hole depth of 158 ~ 196,280,310 meters, etc., have taken to pour cement, water glass quick plugging plugging measures, the effect is not obvious. At the same time, due to rock crushing, fractures often occur leakage, plugging by the above method, often stop drilling and affect the production. Therefore, the use of high-quality low-solid mud top-drain drilling (loss of 1.3 to 1.5 m 3 / h), not only to be a long time slurry, and high mud costs.