文章摘要
超低渗油藏 CO2吞吐室内评价及参数优化
Laboratory Evaluation and Parameter Optimization of CO2 Huff-n-puff in Ultra-low Permeability Reservoirs
  
DOI:
中文关键词: 超低渗油藏  CO2吞吐  焖井时间  换油率  吞吐轮次  段塞大小
英文关键词: ultra-low permeability reservoir  CO2 huff-n-puff  soaking time  oil change rate  huff-n-puff cycle  slug size
基金项目:国家科技重大专项课题“页岩气开发规模预测及开发模式研究”(项目编号 2016ZX05037-006),北京市自然科学基金“超临界CO2对储层性质的改变及油气田开发的影响”(项目编号 3162026)。
作者单位
孙丽丽 1,2,李治平 1,2,窦宏恩 3,郝希宁 4,张运军 3,姜 凯 1,2 1. 中国地质大学(北京)能源学院北京 1000832. 中国地质大学(北京)非常规天然气能源地质评价与开发工程北京市重点实验室北京 1000833.中石油勘探开发研究院北京 1000834. 中海油研究总院北京 100027 
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中文摘要:
      针对鄂尔多斯盆地某超低渗透油藏注水开发矛盾突出、水驱动用程度差和原油采收率低等问题,基于超低渗透油藏特征及国外CO2驱的成功案例,提出了CO2吞吐提高采收率的开发思路。通过长岩心驱替实验,结合换油率和驱油效率来综合评价CO2吞吐在超低渗透油藏的开发效果,并进行了CO2吞吐注采参数的优化。研究结果表明,当油藏压力大于最小混相压力(20.78 MPa)时CO2吞吐能获得较高的采收率;当CO2吞吐段塞大小为0.1 PV、焖井时间为24 h,吞吐3轮次时的CO2吞吐的开发效果最佳,驱油效率为56.39%,平均换油率为0.454。图6表1参16
英文摘要:
      The ultra-low permeability reservoirs in Ordos Basin face serious problems of water injection difficulty,poor flooding results and low oil recovery. In order to improve the oil recovery of ultra-low permeability reservoir,the development idea of CO2 huff-n-puff was proposed based on the characteristics of ultra-low permeability reservoirs and the successful cases of CO2 flooding in abroad. Long core flooding experiment were done in laboratory,and the effect of CO2 huff-n-puff were evaluated combining the oil change rate and displacement efficiency,meanwhile,the injection parameters were optimized. The experiment result showed that CO2 huff-n-puff had higher oil recovery when reservoirs pressure was greater than the minimum miscible pressure(MMP),being of 20.78 MPa. The optimum operation strategy was 0.1 PV for slug size,the soaking time of 24 h and three-cycle huff-n-puff. CO2 huff-n-puff provided an effective method for ultra-low permeability reservoir,the oil displacement efficiency was 56.39% ,the average oil exchange ratio was 0.454.
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