Abstract:

Environmental scientific drilling aims at providing in-situ sample for environmental scientific research. For this purpose, the shooting-type sampling technique with international advanced level, advanced hydraulic piston coring technique using the hydraulic pressure, and the environmental-protection drilling fluid were developed.Further fieldtests which were executed in Lop Nur and Turpan, Xinjiang, and Zhoukoudian, Beijing, indicated that shooting-type sampling technique could effectively reduce the vibration of drilling tool in the process of core drilling, thus could avoid autogenetic grinding of core and improve the reliability of core collection and obviously increase core recovery. It is also revealed that advanced hydraulic piston coring technique is suitable to soil formation with the characteristics of quick indentation, high recovery of soil core, in-situ structure of the core sample preserved and high representativeness, and that environmental-protection drilling fluid has excellent functions of low filtrate loss, strong rejection capability and good lubrication, thus effectively protect the stability of the hole wall and the intactness of the loose core without any environmental pollution.

Key words: environmental and scientific drilling, shooting, coring, hydraulic piston corer, environmental protection, drilling fluid