Volume 43 Issue 2
Apr.  2026
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JI Xiangui, YU Gang, WANG Haitao, et al.Cementing slurry technology for ultra-deep and high-pressure gas storage[J]. Drilling Fluid & Completion Fluid，2026, 43（2）：223-233 doi: 10.12358/j.issn.1001-5620.2026.02.011
Citation: JI Xiangui, YU Gang, WANG Haitao, et al.Cementing slurry technology for ultra-deep and high-pressure gas storage[J]. Drilling Fluid & Completion Fluid，2026, 43（2）：223-233 doi: 10.12358/j.issn.1001-5620.2026.02.011
shu

Cementing Slurry Technology for Ultra-deep and High-pressure Gas Storage

doi: 10.12358/j.issn.1001-5620.2026.02.011
  • 1.

    Bo-Xing Company, CNPC Offshore Engineering Company Limited, Tianjin 300451

  • 2.

    Tarim Oilfield Development Division, Korla, Xinjiang 841000

  • Received Date: 2025-10-18
  • Rev Recd Date: 2025-11-26
  • Publish Date: 2026-04-08
    Abstract
  • With the drilling of gas storage wells in the Tarim basin towards ultra-deep high-pressure formations, well cementing engineering is confronted with multiple challenges, including deeper well drilling, high bottomhole temperature, low displacement efficiency, high risk of gas channeling, and easy failure of cement sheath under alternating loads. Conventional cement slurries can hardly satisfy the requirements of well cementing under such conditions. To deal with these challenges, a high strength tough self-healing cement slurry system suitable for cementing ultra-deep high-pressure gas-storage wells was developed with three core materials optimally selected through a large number of experiments, which are toughening agent BCE-X, self-healing agent BCY-Y and low viscosity filter loss reducer BCF-Z. In the development of the cement slurry system, the mechanisms of improving the strength of a tough cement slurry were investigated from close-packing theory, water/cement ratio control and displacement efficiency optimization, with the cement displacement process also optimized. The results of the research show that the high strength tough self-healing cement slurry system has a density range of 1.86-1.92 g/cm3, an adjustable thickening time, an API filter loss ≤ 50 mL, a settlement density difference of 0, a free water of 0, a 7-d elastic modulus ＜ 6.0 GPa, and a 7-d compressive strength at90 ℃＞30 MPa. This technology has been successfully applied in cementing the liner of the third-interval in the gas-storage well YC-H11 in the block Yaha in the Tarim oilfield. The percent qualified cementing job of the whole well is 99.7%, the rate of excellent job quality reaches 85.9%, and the continuous high-quality cement sheath in the cap rock section is longer than 25 m. It is concluded that through the synergistic effect of mechanical performance optimization and displacement efficiency enhancement, this technology significantly improves the long-term sealing integrity of ultra-deep high-pressure gas storage wells, providing reliable technical support for efficient construction of similar gas storage wells.

     

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