Drilling method and technology for fractured and complex formation in the southern margin of Wula Mountain, Inner Mongolia
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1.Huhhot Natural Resources Comprehensive Survey Center of China Geological Survey,Hohhot Inner Mongolia 010010, China;2.School of Geosciences, Chengdu University of Technology, Chengdu Sichuan 610059, China;3.School of Earth Science and Resources, China University of Geosciences (Beijing), Beijing 100083, China

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P634

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    Abstract:

    Wulashan Daqingshan in Inner Mongolia is an important gold metallogenic belt in North China. More than 100 gold veins have been found in Hadamengou area, Inner Mongolia, and the accumulated gold reserves are more than 100 tons. It is an important gold concentration area in the western part of the northern margin of the North China Craton. Affected by the geological background of strong tectonic movement, the strata conditions in the area are complex, leading to some problems such as leaking, shrinking, collapsing and block falling. All these conditions not only affect the drilling progress, but also create waste holes if not properly handled. In view of this, these paper summarizes a drilling technical method of cement sealing of large fracture stratum+increasing drilling fluid dosage ratio in middle fracture stratum+steady speed and prevention in minute fissure+large dosage ratio of drilling fluid and speeding through the shrinking stratum. In addition, these method has achieved good results in 100ZK5916 project.

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History
  • Received:June 15,2021
  • Revised:June 15,2021
  • Adopted:July 23,2021
  • Online: December 06,2021
  • Published: September 01,2021
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