苏州马环连接线强风化安山玢岩地质勘察钻探技术

强风化岩体裂隙节理发育，风化程度不均，岩石强度软弱不均，为提高钻进效率，改常规的复合片钻头为孕镶金刚石钻头，使钻进时以研磨岩石方式改为切削岩石方式；为提高岩心采取率，保护取心钻具内强风化岩心及防止钻具内岩心段间相互研磨，改单管钻具为单动双管钻具，采用相对优质泥浆进行护壁，预防钻进及提下钻时的卡钻。

Drilling Technology of Geological Survey in Strong Weathered Andesitic Porphyrite in Suzhou

Because of the strong weathered rock fracture joints developing and uneven degree of rock weathering as well as uneven rock hardness, the conventional composite bit are replaced by impregnated diamond bit, which makes the grinding mode change to cutting mode in the drilling process to improve drilling efficiency; in order to improve the core recovery and protect the strong weathered cores in the coring tool and avoid the core segments from grinding each other, the single pipe drilling tool is replaced by single-action double pipe drilling tool. Relatively high quality mud is used to protect wall and prevent drill pipe sticking in drilling and tripping.