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ZHANG Guodong, HE Yuchun, WANG Lei, et al. Intermittent pumping and air cushion combined operation sampling technology for ultra-low permeability gas reservoir formations[J]. Petroleum Drilling Techniques, 2025, 53(0)：1−6. DOI: 10.11911/syztjs.2025039
Citation: ZHANG Guodong, HE Yuchun, WANG Lei, et al. Intermittent pumping and air cushion combined operation sampling technology for ultra-low permeability gas reservoir formations[J]. Petroleum Drilling Techniques, 2025, 53(0)：1−6. DOI: 10.11911/syztjs.2025039
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Intermittent pumping and air cushion combined operation sampling technology for ultra-low permeability gas reservoir formations

  • 1.

    Shanghai branch, CNOOC (China) Co., Ltd., Shanghai, 200030, China

  • 2.

    Schlumberger China Offshore Services S.A, Shenzhen, Guangdong, 518000, China

  • 3.

    China Oilfield Services Limited, Sanhe, Hebei, 065201, China

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  • Received Date: July 11, 2024
  • Revised Date: March 05, 2025
  • Available Online: March 23, 2025
    Graphical Abstract
    • Abstract

  • Cable pump sampling is the fastest and most economical technical method for obtaining reservoir fluids in offshore exploration wells. However, ultra-low permeability gas reservoirs with complex pore structures and poor permeability (where pressure testing mobility mostly falls below 1.0 mD/(mPa·s) present challenges for conventional cable pump sampling methods in terms of efficiency and feasibility, often failing to meet operational requirements. Through technological breakthroughs including structural modification of large sample chambers, modular combination optimization, and simulation analysis of pumping pressure recovery in ultra-low permeability reservoirs, a novel formation pumping sampling technology featuring "intermittent pumping combined with gas cushion operation" has been developed. Field applications have demonstrated that this technology effectively enhances sampling success rates in ultra-low permeability gas reservoirs while reducing single-point sampling time and improving operational efficiency. The successful implementation of this technology provides crucial technical support for reserve evaluation and economically efficient development of offshore ultra-low permeability gas reservoirs..

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    • References (12)
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