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The crude oil in Block A is a highly viscous oil. Due to the high number of throughput cycles, the throughput effect deteriorates and the production decreases significantly. Moreover, after multiple rounds of CO2 huff and puff, the composition of asphalt increases, causing formation blockage and affecting oil recovery efficiency. Relying on a single throughput technology cannot meet the needs of reservoir development. To increase and stabilize oil production in reservoirs, research should be carried out from two aspects: expanding the range of CO2 coverage and improving oil recovery efficiency, and tailored measures should be taken for each well. One is to conduct research and experimentation on low-cost, precise throughput, and efficient potential tapping technology. Strong adhesive sealing is applied to the water output section to protect the oil production potential of the oil well, achieving segmented production of horizontal wells; The second is to screen for new composite plugging removal systems, treat low production liquid wells after multiple rounds of composite huff and puff, and implement targeted plugging removal measures with an effective rate of 100%. The average daily liquid production of a single well has increased from 3.1 cubic meters to 9.2 cubic meters; The third is to carry out crude oil upgrading and oil displacement experiments targeting the already affected range of throughput. A set of surfactant solution + CO2 composite throughput injection process has been established, that is, injecting surfactant pre plug with nitrogen gas to assist CO2 huff and puff, with a significant viscosity reduction effect and a viscosity reduction rate of 58.2%. After the implementation of the project, the oil increase effect was significant. In 2023, the comprehensive water content of Block A decreased by 2.6%, and the daily oil production at the wellhead increased from 35 to 80 tons. This research achievement provides strong support for increasing and stabilizing oil production in reservoirs, and provides new technical ideas and directions for the development of shallow heavy oil reservoirs.

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Research and Application of Stimulation Technology for Shallow Heavy Oil Reservoirs

  • 会议论文

  • 发表日期：

    2025年

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  • Min Li,
  • Bin Wen,
  • Li Ren,
  • Man Xu,
  • Ying Han

摘要

The crude oil in Block A is a highly viscous oil. Due to the high number of throughput cycles, the throughput effect deteriorates and the production decreases significantly. Moreover, after multiple rounds of CO2 huff and puff, the composition of asphalt increases, causing formation blockage and affecting oil recovery efficiency. Relying on a single throughput technology cannot meet the needs of reservoir development. To increase and stabilize oil production in reservoirs, research should be carried out from two aspects: expanding the range of CO2 coverage and improving oil recovery efficiency, and tailored measures should be taken for each well. One is to conduct research and experimentation on low-cost, precise throughput, and efficient potential tapping technology. Strong adhesive sealing is applied to the water output section to protect the oil production potential of the oil well, achieving segmented production of horizontal wells; The second is to screen for new composite plugging removal systems, treat low production liquid wells after multiple rounds of composite huff and puff, and implement targeted plugging removal measures with an effective rate of 100%. The average daily liquid production of a single well has increased from 3.1 cubic meters to 9.2 cubic meters; The third is to carry out crude oil upgrading and oil displacement experiments targeting the already affected range of throughput. A set of surfactant solution + CO2 composite throughput injection process has been established, that is, injecting surfactant pre plug with nitrogen gas to assist CO2 huff and puff, with a significant viscosity reduction effect and a viscosity reduction rate of 58.2%. After the implementation of the project, the oil increase effect was significant. In 2023, the comprehensive water content of Block A decreased by 2.6%, and the daily oil production at the wellhead increased from 35 to 80 tons. This research achievement provides strong support for increasing and stabilizing oil production in reservoirs, and provides new technical ideas and directions for the development of shallow heavy oil reservoirs.