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In recent years, Dongping gas reservoir which is located in the eastern part of the front Altun Mountain in the northern Qaidam basin has entered the stage of full water invasion. Dongping gas reservoir belongs to bedrock fractured bottom-water block gas reservoir, which is affected by reservoir heterogeneity in plane and has high fracture development at structural ridge, although the high production wells are concentrated and the remaining reserves are abundant, the bottom water invasion seriously affects the production of gas wells. Gas lift and foam drainage are the main drainage technology, and the scope of application of a single technology is decreasing year by year, and now it can not meet the demand of gas field drainage. The single technology has problems such as low gas lift efficiency and weak targeting of anti-oil foam drainage agents. It is urgent to expand the drainage scale from the control of wellbore accumulation to the comprehensive water control of gas reservoir. Using the idea of "balance of drainage and invasion" to control water, the gas lift-foam drainage combination technology suitable for bedrock gas reservoir is formed by means of gas lift process parameters designed by Pipesim software, the research and development of intelligent foam drainage system and ZCP-3 anti-oil foam drainage agent and their field application. Through the optimization of gas lift parameters and the field application of ZCP-3 anti-oil foam drainage agent and gas lift-foam drainage combination technology, the average daily new increase in gas production rate of a single well is 3000 m3, and the average daily increase 35 m3 from drainage, the cumulative new increase in gas production rate is 271,400 m3, the gas reservoir decline is basically controlled, and the production situation is gradually improving. The gas lift-foam drainage combination technology not only gives full play to the advantages of a single technology, but also has good field applicability by combining the optimal configuration of process parameters, it provides valuable technical reserve and pilot test for the next step of the recovery of the old area of Dongping bedrock gas reservoir.

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Exploration of Gas Lift-Foam Drainage Combination Technology in Dongping Bedrock Gas Reservoir

  • 会议论文

  • 发表日期：

    2025年

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  • Kai Wei,
  • Xiao-tong Wang,
  • De-lin Wang,
  • Sheng-wei Cong,
  • Yi-ping Wen,
  • Yang-bin Dang,
  • Yong Ni,
  • Bo Ling,
  • Jun Jiang,
  • Xiao-ting Chai

摘要

In recent years, Dongping gas reservoir which is located in the eastern part of the front Altun Mountain in the northern Qaidam basin has entered the stage of full water invasion. Dongping gas reservoir belongs to bedrock fractured bottom-water block gas reservoir, which is affected by reservoir heterogeneity in plane and has high fracture development at structural ridge, although the high production wells are concentrated and the remaining reserves are abundant, the bottom water invasion seriously affects the production of gas wells. Gas lift and foam drainage are the main drainage technology, and the scope of application of a single technology is decreasing year by year, and now it can not meet the demand of gas field drainage. The single technology has problems such as low gas lift efficiency and weak targeting of anti-oil foam drainage agents. It is urgent to expand the drainage scale from the control of wellbore accumulation to the comprehensive water control of gas reservoir. Using the idea of "balance of drainage and invasion" to control water, the gas lift-foam drainage combination technology suitable for bedrock gas reservoir is formed by means of gas lift process parameters designed by Pipesim software, the research and development of intelligent foam drainage system and ZCP-3 anti-oil foam drainage agent and their field application. Through the optimization of gas lift parameters and the field application of ZCP-3 anti-oil foam drainage agent and gas lift-foam drainage combination technology, the average daily new increase in gas production rate of a single well is 3000 m3, and the average daily increase 35 m3 from drainage, the cumulative new increase in gas production rate is 271,400 m3, the gas reservoir decline is basically controlled, and the production situation is gradually improving. The gas lift-foam drainage combination technology not only gives full play to the advantages of a single technology, but also has good field applicability by combining the optimal configuration of process parameters, it provides valuable technical reserve and pilot test for the next step of the recovery of the old area of Dongping bedrock gas reservoir.