Long barrel coring technology for Well Maye-1 in Junggar Basin
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1.Institute of Exploration Techniques, CAGS, Langfang Hebei 065000, China;2.Deep Geological Drilling Technology Research Center, China Geological Survey, Langfang Hebei 065000, China;3.Exploration Division of Xinjiang Oilfield Company, Karamay Xinjiang 834000, China;4.Karamay Drilling Company of CNPC Western Drilling Company, Karamay Xinjiang 834000, China;5.School of Engineering and Technology, China University of Geosciences, Beijing 100083, China

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P634;TE24

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    Abstract:

    Well Maye-1 is a venture exploration well deployed in the Wuxia fault zone of the Western uplift of Junggar Basin by Xinjiang Oilfield Company Limited. The purpose is to explore the prospecting potential of shale oil and conventional high porosity volcanic rock oil reservoirs in Fengcheng Formation. The designed coring length of the whole well was 275m with the actual coring length of 445m. The well is characterized with long coring interval, low coring efficiency in tight mudstone formation, easy core jamming in fracture developed sections, etc. In view of the formation characteristics in the area and the technical difficulties faced by the long coring interval of Well Maye-1, the long barrel core drilling process with the KT216 tool was applied in combination with diamond drilling at high RPM driven by bottom hole power. Compared with adjacent wells, Well Maye-1 had an increase of 1.79 times in comprehensive drilling efficiency over the long coring interval with the continuous coring length of 445m and the coring length per run of 41.97m, setting the record in the history of the area. It can provide reference for the subsequent implementation of continuous coring over long well sections in the area.

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History
  • Received:June 15,2022
  • Revised:July 27,2022
  • Adopted:August 01,2022
  • Online: September 29,2022
  • Published: September 10,2022
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