Winter drilling construction technology in Shenjing coal exploration area,Zhongwei City,Ningxia
The coal resource exploration project in the Shenjing block,Zhongwei City,Ningxia,is an urgently needed local mineral resource project for energy supply.The drilling work needs to be conducted in winter when the lowest temperature is-21℃.During the construction period,great challenges exist due to the influence of low temperature and strata fragmentation.The main coal seams were dominated by fine coal,which leads to the highly difficulty of coring.By using a low-temperature resistant flushing fluid system,reasonable maintenance of drill diesel engines and other equipment,optimization of drilling tool combinations,and improving the anti-cold and warm kepping conditions for construction personnel,the winter drilling construction is successfully completed,with an average monthly efficiency of 811.8m/month.
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