DRILLING OF EXTRA-HARD FORMATIONS
DRILLING OF EXTRAHARD FORMATIONS
摘要
The reason for bit slipping in extrahard formations has been analysed, and a new type of antislipping bit for extrahard formations have been recommended.
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8WU Qifan1,2, LU Fengxiang3, LIU Qingsheng3, ZHENG Jianping3, WANG Maoji2 & WU Wenli4 1. Department of Engineering Physics, Tsinghua University, Beijing 100084, China,2. Aero Geophysical Survey & Remote Sensing Center, Beijing 100083, China,3. China University of Geosciences, Wuhan 430074, China,4. Institute of Geophysical & Geochemical Exploration, Langfang 065000, China.Archean relic body at lower crust in Sulu area:Evidence from magnetic data[J].Chinese Science Bulletin,2003,48(6):589-593. 被引量：3
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