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The Mahu tight conglomerate reservoir in the Junggar Basin has a large burial depth. After development using the “horizontal well + volume fracturing” method, it exhibits rapid decline and low recovery efficiency. Hydrocarbon gas flooding technology has been carried out to tackle these issues, achieving significant oil production enhancement. However, the artificial fracturing fracture network of horizontal wells leads to severe gas channeling. The wellhead pressure of gas-channeling wells has increased by 33 MPa. Frequent wellhead freezing and blockage occur due to the rise in gas-oil ratio, resulting in great challenges in gas flooding development and high safety risks. To reduce the wellhead pressure and gas production of oil wells, minimize invalid gas injection cycles, and improve gas flooding efficiency, a technical research on gas channeling profile control for gas injection wells was proposed. First, the causes of fracture gas channeling channels were clarified, and a gas channeling model for the Mahu tight conglomerate reservoir was established. Integrated geological and engineering research was conducted to accurately predict gas channeling pathways. For severe fracture-type gas channeling, high-strength plugging agents suitable for high-conductivity fractures were developed, forming a profile control strategy of “injecting balanced profile—polymer plugging of distal fractures—gel plugging of near-well high-conductivity fractures—post-plugging slug protection of reservoirs” to achieve efficient fracture plugging. After profile control of gas injection wells, the wellhead oil pressure and gas-oil ratio of gas-channeling wells significantly decreased, fundamentally reducing safety risks caused by gas channeling and alleviating on-site safety management pressures. The dual goals of “safety assurance + efficient production improvement” were achieved, providing a technical reference for solving gas channeling problems in gas flooding production of unconventional oil and gas reservoirs in domestic oil fields.

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Research on Channeling Plugging and Profile Control Technology for Hydrocarbon Gas Flooding After Horizontal Well Fracturing in Mahu Tight Conglomerate Reservoir

  • 章节

  • 发表日期：

    2026年

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  • Tian Zhang,
  • Chen-guang Cui,
  • Ji-gang Zhang,
  • Ping Song,
  • Long Tan,
  • Yong-gang Yi,
  • Shuo Wang,
  • Dong-liang Chen,
  • Ling Wang,
  • Xiao-li Zhang,
  • Yan-ling Shi

摘要

The Mahu tight conglomerate reservoir in the Junggar Basin has a large burial depth. After development using the “horizontal well + volume fracturing” method, it exhibits rapid decline and low recovery efficiency. Hydrocarbon gas flooding technology has been carried out to tackle these issues, achieving significant oil production enhancement. However, the artificial fracturing fracture network of horizontal wells leads to severe gas channeling. The wellhead pressure of gas-channeling wells has increased by 33 MPa. Frequent wellhead freezing and blockage occur due to the rise in gas-oil ratio, resulting in great challenges in gas flooding development and high safety risks. To reduce the wellhead pressure and gas production of oil wells, minimize invalid gas injection cycles, and improve gas flooding efficiency, a technical research on gas channeling profile control for gas injection wells was proposed. First, the causes of fracture gas channeling channels were clarified, and a gas channeling model for the Mahu tight conglomerate reservoir was established. Integrated geological and engineering research was conducted to accurately predict gas channeling pathways. For severe fracture-type gas channeling, high-strength plugging agents suitable for high-conductivity fractures were developed, forming a profile control strategy of “injecting balanced profile—polymer plugging of distal fractures—gel plugging of near-well high-conductivity fractures—post-plugging slug protection of reservoirs” to achieve efficient fracture plugging. After profile control of gas injection wells, the wellhead oil pressure and gas-oil ratio of gas-channeling wells significantly decreased, fundamentally reducing safety risks caused by gas channeling and alleviating on-site safety management pressures. The dual goals of “safety assurance + efficient production improvement” were achieved, providing a technical reference for solving gas channeling problems in gas flooding production of unconventional oil and gas reservoirs in domestic oil fields.