Difficulty in retaining hole blocking, low pore

Currently, the situ leachable sandstone-type uranium deposits of uranium exploration in China has become the main type deposits. Our situ leachable sandstone-type polycrystalline diamond  exploration areas are mainly located in the north of the Mesozoic-Cenozoic basins, drilling, construction difficult, the production of the main problems are: (1) rock cores taken low; (2) Drilling Protection blocking difficulties into the hole low; (3) hole accidents; (4) drilling efficiency is low, construction costs are high; (5) eggs conglomerate drilling difficult. "Loose rock coring" and "gravel drilling" is a basin-situ leachable sandstone-type synthetic diamond of two important problems. Thesis topics from the Nuclear Industry Geological Bureau "fifteen" uranium geology research project "situ leachable  cubic boron nitride  uranium deposits loose rock coring technology research and its applications", introduces the author in recent years, "loose rock coring technique research "and" gravel coring technology research, "Some aspects of the research carried out and achieved some results.