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Novel Water-Based Mud for Low-Permeable Reservoir in South China Sea

Author

Listed:
  • Siyuan Lin

    (School of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
    CNOOC China Limited, Zhanjiang Branch, Zhanjiang 524057, China)

  • Yunhu Lu

    (School of Petroleum Engineering, China University of Petroleum, Beijing 102249, China)

  • Zhiqin Liu

    (CNOOC China Limited, Zhanjiang Branch, Zhanjiang 524057, China)

  • Wei Lu

    (Oil Production Research Institute of Huanqing Oil Production Plant of PetroChina Yumen Oilfield Company, Qingyang 745700, China)

  • Po Hu

    (Oil Production Research Institute of Huanqing Oil Production Plant of PetroChina Yumen Oilfield Company, Qingyang 745700, China)

Abstract

Conventional reservoir drill-in fluids used for drilling reservoirs in Weizhou Oilfield encounter rheological problems that result in technical problems such as hole-cleaning in openhole horizontal intervals. Hence, novel drill-in fluid was developed by optimizing the additive quantity and particle size distribution. Lab tests showed that novel drill-in fluids boast high low shearing rate viscosity, and provide promising cutting, carrying, and suspension capabilities. Furthermore, the novel drill-in fluids performed well in reservoir protection, with a permeability recovery rate of more than 90%. The novel drill-in fluids also have high inhibition capabilities with a linear expansion rate of mud shale as low as 10%, with a rolling recovery rate of up to 96.48%. Field application results showed no pipe-stuck was encountered during tripping in the horizontal interval when using the novel drill-in fluid. Moreover, by using the novel drill-in fluids, skin factor was reduced from 20.0 to −3.0, and daily oil production was double what was expected. It was concluded that novel drill-in fluids meets the demand of horizontal drilling intervals in Weizhou Oilfield and improves hole-cleaning and reservoir protection in the horizontal well.

Suggested Citation

  • Siyuan Lin & Yunhu Lu & Zhiqin Liu & Wei Lu & Po Hu, 2023. "Novel Water-Based Mud for Low-Permeable Reservoir in South China Sea," Energies, MDPI, vol. 16(4), pages 1-9, February.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:4:p:1738-:d:1063211
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