缝洞型碳酸盐岩油藏注气吞吐生产动态及注入介质优选
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摘要
塔河油田缝洞型油藏在底水驱动或注水替油开采结束后,仍存在阁楼油、绕流油和井间油等多种剩余油类型。为了获得不同缝洞连通情况下注气吞吐生产动态,揭示不同注气吞吐介质对轻质/重质原油采出程度的影响规律,利用依据地质资料设计的室内三维物理模型,模拟底水条件下典型缝洞结构单元的注水替油过程及注气吞吐过程,考察了相同条件下不同原油黏度(1094.5 mPa·s和23.6 mPa·s)与不同气体介质(N_2、CO_2、复合气(N_2∶CO_2=1∶1))对剩余油的启动效果。结果表明,注气吞吐控水增油效果明显,N_2、CO_2通过重力分异作用可置换阁楼油,通过气体膨胀作用携带井间油及绕流油;对于黏度为1094.5 m Pa·s的稠油,注N_2、CO_2、复合气(N_2∶CO_2=1∶1)对模型采出程度的提高幅度分别为19.59%、14.54%、7.55%,而对黏度为23.6 m Pa·s的稀油,注气吞吐采出程度分别提高10.87%、10.12%、7.41%,注气对稠油的吞吐效果优于稀油,且N_2和CO_2吞吐效果优于复合气(N_2∶CO_2=1∶1)。
Tahe fractured-vuggy reservoirs have a variety of residual oil,such as attic oil,inter-well oil,et al,after bottom water driving oil or water-flooding and replacing oil.In order to analyze the dynamic characteristics of gas injection huff and puff production and the influence of different gas injection medium on the recovery of light/heavy oil reservoir,the injecting water replace oil and injecting gas huff-and-puff was simulated with an indoor 3 D physical model,which was designed based on the geological datum,the huff-and-puff effect of the three gas mediums(N_2,CO_2 and composite gas(N_2∶CO_2=1∶1))on residual oil was studied at the different viscosity of 1094.5 mPa·s and 23.6 mPa·s.The experimental results showed that the injecting gas huff-and-puff could control the bottom water and increase oil production obviously,N_2,and CO_2 could replace attic oil by the impact of gravitational differentiation,and flow around oil and inter-well oil could be carried by the impact of gas swelling.After N_2,CO_2 and composite gas huff-and-puff,the oil recovery for the heavy oil with the viscosity of 1094.5 m Pa·s was enhanced by 19.59%,14.54% and 7.55%,respectively;while the oil recovery for the light oil with the viscosity of 23.6 m Pa·s was enhanced by 10.87%,10.12% and 7.41%,respectively.The effect of injecting gas huff-and-puff for heavy oil was better than that for light oil under this experimental condition,and the effect of N_2、CO_2 huff-and-puff was better than that of composite gas(N_2∶CO_2=1∶1).
Tahe fractured-vuggy reservoirs have a variety of residual oil,such as attic oil,inter-well oil,et al,after bottom water driving oil or water-flooding and replacing oil.In order to analyze the dynamic characteristics of gas injection huff and puff production and the influence of different gas injection medium on the recovery of light/heavy oil reservoir,the injecting water replace oil and injecting gas huff-and-puff was simulated with an indoor 3 D physical model,which was designed based on the geological datum,the huff-and-puff effect of the three gas mediums(N_2,CO_2 and composite gas(N_2∶CO_2=1∶1))on residual oil was studied at the different viscosity of 1094.5 mPa·s and 23.6 mPa·s.The experimental results showed that the injecting gas huff-and-puff could control the bottom water and increase oil production obviously,N_2,and CO_2 could replace attic oil by the impact of gravitational differentiation,and flow around oil and inter-well oil could be carried by the impact of gas swelling.After N_2,CO_2 and composite gas huff-and-puff,the oil recovery for the heavy oil with the viscosity of 1094.5 m Pa·s was enhanced by 19.59%,14.54% and 7.55%,respectively;while the oil recovery for the light oil with the viscosity of 23.6 m Pa·s was enhanced by 10.87%,10.12% and 7.41%,respectively.The effect of injecting gas huff-and-puff for heavy oil was better than that for light oil under this experimental condition,and the effect of N_2、CO_2 huff-and-puff was better than that of composite gas(N_2∶CO_2=1∶1).
引文
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[13]荣元帅,李新华,刘学利,等.塔河油田碳酸盐岩缝洞型油藏多井缝洞单元注水开发模式[J].油气地质与采收率,2013(2):58-61.
[14]侯吉瑞,李海波,姜瑜,等.多井缝洞单元水驱见水模式宏观三维物理模拟[J].石油勘探与开发.2014,41(6):717-722.
[15]胡蓉蓉,姚军,孙致学,等.塔河油田缝洞型碳酸盐岩油藏注气驱油提高采收率机理研究[J].西安石油大学学报(自然科学版),2015(2):49-53.
[16]姚军,胡蓉蓉,王晨晨,等.缝洞型介质结构对非混相气驱油采收率的影响[J].中国石油大学学报(自然科学版),2015(2):80-85.
[2]修乃岭,熊伟,高树生,等.缝洞型油藏储集空间连通关系和开发特征初探[J].中国西部油气地质,2007(1):105-107.
[3]肖玉茹,何峰煜,孙义梅.古洞穴型碳酸盐岩储层特征研究——以塔河油田奥陶系古洞穴为例[J].石油与天然气地质,2003(1):75-80.
[4]惠健,刘学利,汪洋,等.塔河油田缝洞型油藏单井注氮气采油机理及实践[J].新疆石油地质,2015(1):75-77.
[5]惠健,刘学利,汪洋,等.塔河油田缝洞型油藏注气替油机理研究[J].钻采工艺,2013(2):55-57.
[6]侯吉瑞,张丽,李海波,等.碳酸盐岩缝洞型油藏氮气驱提高采收率的影响因素[J].油气地质与采收率,2015(5):64-68.
[7]李巍,侯吉瑞,丁观世,等.碳酸盐岩缝洞型油藏剩余油类型及影响因素[J].断块油气田,2013(4):458-461.
[8]郑泽宇,朱倘仟,侯吉瑞,等.碳酸盐岩缝洞型油藏注氮气驱后剩余油可视化研究[J].油气地质与采收率,2016(2):1-5.
[9]沈晓英,汤勇,王卫东,等.吐哈油田稠油油藏优化注气吞吐降黏实验研究[J].钻采工艺,2013(5):88-91.
[10]妥宏,马愉,糜娜,等.英2井深层稠油油藏注气吞吐降黏实验[J].新疆石油地质,2012(1):108-110.
[11]林吉生.CO2提高特超稠油采收率作用机理研究[D].中国石油大学,2008.
[12]袁飞宇,张世亮,海涛,等.缝洞型碳酸盐岩油藏注氮气采油实践及认识[J].石油天然气学报,2014(12):165-168.
[13]荣元帅,李新华,刘学利,等.塔河油田碳酸盐岩缝洞型油藏多井缝洞单元注水开发模式[J].油气地质与采收率,2013(2):58-61.
[14]侯吉瑞,李海波,姜瑜,等.多井缝洞单元水驱见水模式宏观三维物理模拟[J].石油勘探与开发.2014,41(6):717-722.
[15]胡蓉蓉,姚军,孙致学,等.塔河油田缝洞型碳酸盐岩油藏注气驱油提高采收率机理研究[J].西安石油大学学报(自然科学版),2015(2):49-53.
[16]姚军,胡蓉蓉,王晨晨,等.缝洞型介质结构对非混相气驱油采收率的影响[J].中国石油大学学报(自然科学版),2015(2):80-85.