黄3区低渗透裂缝性油藏提高CO_2驱波及对策研究
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摘要
黄3区低渗裂缝性油藏开展注CO_2驱先导实验整体增油降水效果明显,但部分井见气,气窜现象严重,降低了CO_2驱增油效果。为了提高低渗裂缝性油藏CO_2驱波及效率,采用示踪剂监测结合生产动态分析及数值模拟生产历史拟合的方式识别了储层优势渗流通道。在此基础上获取考虑优势通道的井组数值模拟模型,通过组分油藏数值模拟技术研究优势通道对CO_2驱替效果的影响,并模拟对比了4种改善波及对策提高驱油效率的措施。结果显示,优势通道使CO_2驱原油采收率下降7%。采用高强度封堵措施封堵优势通道效果最好,RF提高了1.8%;优势通道井气窜早期关井效果较好;注水保持地层压力时其次;生产井GOR达到2 000 m~3/m~3时关井相对较差,RF仅提高0.11%。研究成果对于低渗裂缝性油藏注气驱方案设计具有指导意义。
A CO_2 flooding pilot test was carried out on the low permeability fractured reservoirs in Huang-3 block. The research results indicated that there were obvious oil-increasing effects in the overall area, but the gas channeling phenomenon was serious in some wells, resulting in a poor effect of CO_2 flooding. In order to improve the CO_2 flooding efficiency of low permeability fractured reservoirs, the dominant flow channels were identified by tracer monitoring combined with production dynamic analysis and numerical simulation of production history fitting. On this basis, a numerical simulation model of the well group considering the dominant channels was obtained. The effects of the dominant channels on the CO_2 displacement were studied by the numerical simulation technology of the component reservoirs, and four measures to improve the oil displacement efficiency were simulated. The results showed that the dominant channels reduced the CO_2 flooding oil recovery by 7 %. The best effect was obtained by blocking the dominant channels with high-intensity plugging measures, and the RF had increased by 1.8 %. The second best effect was when the dominant channels wells were shut down in the early stage of the gas channeling. Then followed when the water injection maintained the formation pressure. Shut in of the well was relatively poor when the GOR of production well reached 2 000 m3/m3, and the RF only increased by 0.11 %. The research results have guiding significance for the design of gas injection drive scheme for low permeability fractured reservoirs.
A CO_2 flooding pilot test was carried out on the low permeability fractured reservoirs in Huang-3 block. The research results indicated that there were obvious oil-increasing effects in the overall area, but the gas channeling phenomenon was serious in some wells, resulting in a poor effect of CO_2 flooding. In order to improve the CO_2 flooding efficiency of low permeability fractured reservoirs, the dominant flow channels were identified by tracer monitoring combined with production dynamic analysis and numerical simulation of production history fitting. On this basis, a numerical simulation model of the well group considering the dominant channels was obtained. The effects of the dominant channels on the CO_2 displacement were studied by the numerical simulation technology of the component reservoirs, and four measures to improve the oil displacement efficiency were simulated. The results showed that the dominant channels reduced the CO_2 flooding oil recovery by 7 %. The best effect was obtained by blocking the dominant channels with high-intensity plugging measures, and the RF had increased by 1.8 %. The second best effect was when the dominant channels wells were shut down in the early stage of the gas channeling. Then followed when the water injection maintained the formation pressure. Shut in of the well was relatively poor when the GOR of production well reached 2 000 m3/m3, and the RF only increased by 0.11 %. The research results have guiding significance for the design of gas injection drive scheme for low permeability fractured reservoirs.
引文
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[15]葛嵩,卢祥国,刘进祥,等.无机地质聚合物凝胶封堵效果和储层适应性研究[J].油气藏评价与开发,2018,8(3):51-54.
[16]何应付,周锡生,李敏,等.特低渗透油藏注CO2驱油注入方式研究[J].石油天然气学报,2010,32(6):131-134.
[17]赵阳,吴景春,石芳,等.低渗透裂缝型油藏多轮次调驱物理模拟实验研究[J].油气藏评价与开发,2018,8(1):44-48.
[2]赵永攀,赵习森,李剑,等.低渗透油藏CO2驱油室内实验与矿场应用[J].大庆石油地质与开发,2018,37(1):128-133.
[3]祝春生,程林松.特低渗透油藏CO2驱提高原油采收率评价研究[J].钻采工艺,2007,30(6):55-57.
[4] Zhao F, Zhang L, Hou J, et al. Profile improvement during CO2 flooding in ultra-low permeability reservoirs[J]. Petroleum Science, 2014, 11(2):279-286.
[5] Khosravi M, Bahramian A, Emadi M. Mechanistic investigation of by passed-oil recovery during CO2injection in matrix and fracture[J]. Fuel, 2014, 117(Part A):43-49.
[6]赵习森,石立华,王维波,等.非均质特低渗透油藏CO2驱气窜规律研究[J].西南石油大学学报:自然科学版,2017,39(6):139.
[7] Gao Y, Zhao M, Wang J, et al. Performance and gas breakthrough during CO2 immiscible flooding in ultra-low permeability reservoirs[J]. Petroleum Exploration and Development, 2014, 41(1):88-95.
[8] Zhang L, Zhao F L, Hou J R. Experimental study of improving the CO2 flooding development effect in ultra-low permeability reservoir[J]. Advanced Materials Research, 2012, 594-597:2470-2474.
[9]孟展,杨胜来,王璐,等.致密油藏CO2吞吐数值模拟研究新进展[J].石油化工高等学校学报,2016,29(6):39-42.
[10]王鸣川,石成方,朱维耀,等.优势渗流通道识别与精确描述[J].油气地质与采收率,2016,23(1):79-84.
[11]张艳红. GD油田优势渗流通道演化模拟与识别研究[D].东营:中国石油大学(华东)2016.
[12]丁帅伟,姜汉桥,赵冀,等.水驱砂岩油藏优势通道识别综述[J].石油地质与工程,2015,29(5):132-136.
[13]王利美,张国萍,胡艳霞,等.井间示踪剂大孔道识别及剩余油饱和度分布技术[J].断块油气田,2003,10(4):72-73.
[14] Liang X. A simple model to infer interwell connectivity only from well-rate fluctuations in waterfloods[J]. Journal of Petroleum Science&Engineering, 2010, 70(1-2):35-43.
[15]葛嵩,卢祥国,刘进祥,等.无机地质聚合物凝胶封堵效果和储层适应性研究[J].油气藏评价与开发,2018,8(3):51-54.
[16]何应付,周锡生,李敏,等.特低渗透油藏注CO2驱油注入方式研究[J].石油天然气学报,2010,32(6):131-134.
[17]赵阳,吴景春,石芳,等.低渗透裂缝型油藏多轮次调驱物理模拟实验研究[J].油气藏评价与开发,2018,8(1):44-48.