Volume 50 Issue 1
Jan.  2022
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LU Ziqing，GAO Yaoquan，GUO Yuan.Optimization of surface directional wells for water control based on three-dimensional seismic dynamic geological modeling[J].Coal Geology & Exploration，2022，50(1)：92−100. DOI: 10.12363/issn.1001-1986.21.11.0637
Citation: LU Ziqing，GAO Yaoquan，GUO Yuan.Optimization of surface directional wells for water control based on three-dimensional seismic dynamic geological modeling[J].Coal Geology & Exploration，2022，50(1)：92−100. DOI: 10.12363/issn.1001-1986.21.11.0637
shu

Optimization of surface directional wells for water control based on three-dimensional seismic dynamic geological modeling

  • 1.

    China Coal Research Institute, Beijing 100013, China

  • 2.

    Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China

  • 3.

    No.2 Tahe Oil Production Plant, SINOPEC Northwest Oilfield Company, Luntai 841604, China

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  • Received Date: October 31, 2021
  • Revised Date: December 20, 2021
  • Available Online: January 26, 2022
  • Published Date: January 31, 2022
    Graphical Abstract
    • Abstract
  • In the treatment of high-pressure Ordovician limestone water in the coal seam floor, the design and construction optimization of surface directional wells mainly relies on two-dimensional AutoCAD geological drawings. For the avoidance of such problems as low drilling rate and off-target in the target area under complex geological conditions, and to improve the effect of precise targeted water hazard control, a technology for optimizing directional wells for water hazard prevention and control based on seismic dynamic modeling is proposed. By comparing and analyzing the current situation and problems of drilling trajectory design and optimization technology, it is pointed out that the geological model is applicable to the optimization of directional wells for water hazard prevention and control according to the specific needs of drilling engineering for surface water prevention and control. On the basis of the analysis of modeling theory, the seismic volume-based geological model is studied, the key elements of geological models related to directional well trajectory design are analyzed, and the strategies of model dynamic updating and well trajectory adjustment are discussed. The surface drilling project of Ordovician limestone water treatment in the coal floor of No.6 Coal seam in Tangjiahui Coal Mine is taken as an example. In the design stage of the directional well, the volume-based geological model of strata, faults and abnormal areas is established by using three-dimensional seismic data. Under the control of three-dimensional geometry of abnormal areas and formation fracture properties, the multi-branch horizontal well track design is provided. During the construction of the directional well, the geological model is adjusted by tracking the drilling data, and the drilling trajectory is dynamically optimized by timely correcting the target layer depth of the preset drilling trajectory, improving the landing accuracy of the target formation and the drilling ratio in abnormal geo-bodies. The practice shows that the directional well trajectory design and trajectory optimization based on seismic dynamic geological modeling is conducive to improve the drilling efficiency, and create good grouting conditions, therefore improving the treatment effect of abnormal target areas, and laying a data foundation for the intelligent decision-making of Ordovician limestone water disaster prevention and control.
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