陈贞龙,冯建秋,裴向兵,吴波,张谭,蒋轲,邓宝康
Chen Zhenlong,Feng Jianqiu,Pei Xiangbing,Wu Bo,Zhang Tan,Jiang Ke,Deng Baokang

• 1:中国石化华东油气分公司
• 2:中国石油煤层气有限责任公司
• 3:西安商鼎能源科技有限公司

摘要(Abstract)：

为了探究裂缝-基质型致密凝析气藏注气改善反凝析伤害机制，评价注气凝析油采收率提高效果，针对裂缝和基质型致密岩心，开展长岩心衰竭实验和注气驱替实验，评级注气改善反凝析伤害程度和凝析油采收率提高效果，明确注气介质、储层性质和注气时机对注气提高凝析油采收率的影响。结果表明：在反凝析近井叠加效应影响下，长岩心渗透率降低率达83.3%，岩心压差增大了5.1倍；在最大反凝析压力下注入CO_2后，长岩心渗透率恢复率为41.6%，岩心压差降低率为46.6%，凝析油采收率提高25.6百分点；干气注入后渗透率恢复率和压差降低率分别为15.5%和38.1%，凝析油采收率提高15.7百分点，注N_2效果最差；基质型储层注气凝析油采收率与渗透率相关性较小，而裂缝型储层注气效果远低于基质型；储层压力注气，凝析油采收率提高幅度远高于最大反凝析压力下注气。研究成果对压裂后凝析气藏注气开发方案设计和动态跟踪调整具有重要意义。
In order to clarify the mechanism of gas injection to decrease retrograde condensate damage in fracturematrix tight condensate gas reservoir and evaluate the effect of gas injection in improving condensate recovery, for fractures and matrix tight cores, long-core depletion experiment and gas injection displacement experiment are carried out to evaluate the effect of gas injection on improving the degree of retrograde condensate damage and condensate recovery, clarifying the influence of gas injection medium, reservoir properties and gas injection timing on gas injection to enhance condensate recovery. The results show that under the influence of near-wellbore superimposed effect of retrograde condensation, decreasing rate of long core permeability reaches 83.3%, with core pressure difference increased by 5.1 times. After CO_2 injection at the maximum retrograde condensate pressure, the permeability recovery rate of long core is 41.6%, the core pressure difference decreasing rate is 44.4%, and the condensates recovery rate increases by 25.6 percentage points. After dry gas injection, permeability recovery rate and decreasing rate of pressure difference are 15.5% and 30.6%, respectively, with condensate recovery increased by 15.7 percentage points, while the effect of N_2 injection is the worst. Gas injection condensate recovery of matrix reservoir has little correlation with permeability, while gas injection effect of fractured reservoir is significantly lower than that of matrix reservoir. The increase of gas injection condensate recovery at reservoir pressure is much higher than that at maximum retrograde condensate pressure. The research provides guiding significance for the design of gas injection development scheme and dynamic tracking adjustment of post-fracturing condensate gas reservoir.

关键词(KeyWords)： 注气;凝析气;反凝析伤害;反蒸发;裂缝;基质
gas injection;condensate gas;retrograde condensate damage;retrograde evaporation;fracture;matrix

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”（2016ZX05050）;; 国家自然科学基金项目“陆相页岩油藏CO2压裂复杂缝网形成机制及增产机理”（5207042143）

作者(Author): 陈贞龙,冯建秋,裴向兵,吴波,张谭,蒋轲,邓宝康
Chen Zhenlong,Feng Jianqiu,Pei Xiangbing,Wu Bo,Zhang Tan,Jiang Ke,Deng Baokang

DOI: 10.19597/J.ISSN.1000-3754.202411038

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