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Volume 46 Issue 3
May  2024
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2024  >  46(3): 630-637
HE Xinxing, YAN Yancheng, ZHU Liping, WANG Xiyong, ZHU Huashu, WANG Zhiguo. Safety and accelerated drilling technologies for deep shale gas in Weirong of Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(3): 630-637. doi: 10.11781/sysydz202403630
Citation: HE Xinxing, YAN Yancheng, ZHU Liping, WANG Xiyong, ZHU Huashu, WANG Zhiguo. Safety and accelerated drilling technologies for deep shale gas in Weirong of Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(3): 630-637. doi: 10.11781/sysydz202403630
shu

Safety and accelerated drilling technologies for deep shale gas in Weirong of Sichuan Basin

doi: 10.11781/sysydz202403630
  • 1.

    Petroleum Engineering Technology Research Institute, SINOPEC Southwest Oil and Gas Company, Deyang, Sichuan 618000, China

  • 2.

    Unconventional Oil and Gas Exploration and Development Management Department, SINOPEC Southwest Oil and Gas Company, Chongqing 402160, China

  • 3.

    Shale Gas Project Department, SINOPEC Southwest Oil and Gas Company, Chongqing 402160, China

  • Received Date: 2023-08-29
  • Rev Recd Date: 2024-04-03
  • Publish Date: 2024-05-28
    Abstract
  • The Weirong shale gas in the Sichuan Basin, buried at depths of 3 600-3 850 m, represents a prototypical deep shale gas reservoir. Drilling operations face challenges such as a complex pressure system, developed fault-dissolved bodies in certain areas of the Maokou Formation, poor drillability of formations, and high strata temperatures in the Longmaxi Formation. To address these complex geological conditions, this study focused on the safe and accelerated drilling. By combining mature technologies with pilot testing, continuous efforts were made to advance drilling engineering techniques. Through deepening the understanding of the geology of the passing strata sections, targeted solutions for each section were implemented to enhance the precision of engineering techniques. The Weirong shale gas field had gone through three stages: exploration and evaluation, development phaseⅠ, and Ⅱ. This led to the development of safe drilling technologies that emphasize optimization of well structure, track designs avoiding fault-dissolved bodies, wellbore pressure control, and synchronized drilling andfracturing to prevent interference between wells. Additionally, accelerated drilling technologies were cultivated, focusing on a "2D + small 3D" three-dimensional track profile, integrated geological guidance, optimal rock-breaking tools, and enhanced drilling parameters. Applied to over 150 well drillings in the Weirong shale gas field, these technologies increased the rate of penetration from 6.32 m/h at the start of development to 9.12 m/h, reduced the drilling cycle from 106.68 days to 68.75 days (a reduction of 35.56%), achieving the goal of acce-lerated and cost-effective deep shale gas drilling in Weirong area. These technologies provide significant reference value for the development of similar gas reservoirs.

     

    • All authors disclose no relevant conflict of interests.
    The overall writing of the paper was carried out by HE Xinxing. The article review was completed by YAN Yancheng. The track optimization design and the complicated geological body track barrier relief were completed by ZHU Liping. The geological engineering characteristics and difficulties were analyzed by WANG Xiyong. The fracturing effect prevention and parameter strengthening were completed by ZHU Huashu. WANG Zhiguo participated in the writing and revision of the paper. All authors have read the last version of the paper and consented to its submission.
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