下二门H2Ⅲ油组聚合物驱剩余油分布规律及调整挖潜研究
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摘要
室内实验和矿场实践表明,聚合物驱可以提高采收率8～15%,但聚合物驱后地下仍有50%的残余油。与水驱剩余油相比,聚合物驱后剩余油量更少、分布更为零散、油水性质更为复杂,剩余油挖潜调整余地更小、难度更大。因此,如何搞清聚合物驱后剩余油分布特点,如何进一步改善聚合物驱开发效果提高经济效益已成为当前主要研究课题。
物理模拟实验表明,聚合物溶液通过本身的粘弹性可以驱替被分割、捕集、滞留在小孔道中的水驱残余油,聚合物驱后残余油主要分布于孔隙中央;后续注入水改向进入原来被油占据的小孔道,后续水驱后颗粒表面未残留下油膜,与水驱残余油明显不同;在纵向上聚合物驱后剩余油主要分布在中、低渗透层内,其中低渗透层的剩余油饱和度为32.8～69.6%。
本文在物理模拟实验研究结果的基础上,针对下二门H2III油组地质构造复杂、开发历史长、合采合注井多、作业措施频繁等特点和难点,采取了优化网格、分层系储层流体物性控制、精细动态数据控制和精细历史拟合等数值模拟研究技术,定量分析了聚合物驱后平面、纵向水淹状况和剩余油分布规律,确定了影响剩余油分布的主要因素和剩余潜力分布。以上述剩余油分布规律及潜力分布为基础,开展了改善聚合物驱及后续水驱开发效果途径研究,提出了剩余油挖潜的可行措施。平面上通过部署加密井、配产配注、老井转注,进一步完善了注采系统,提高储量动用程度;纵向上通过油水井补孔、堵水、调剖、分采、分注等动态调配措施,进一步提高了中低渗透层的潜力。动态预测结果表明,方案实施后,预计增加产能2.52×10~4t,采油速度大于1.03%,稳产期延长两年,采收率可以提高2.05个百分点,取得了良好的效果。
本文实现了聚合物驱后剩余油分布微观研究与宏观研究相结合、定性研究与定量研究相结合、剩余油调整挖潜及效果预测的一体化研究,对其它区块的聚合物驱开发调整挖潜具有重要的指导意义。
The results from laboratory and field test show that polymer flooding can improve 8~15% OOIP, but still 50% remaining oil underground after polymer flooding. Compared with that after waterflooding, the remaining oil is less, more scattered, and fluid property is more complicated, and exportation is more difficult after polymer flooding. So how to make clear residual oil distribution after polymer flooding and how to improve development effect of polymer flooding become the present main research subject.The results from physical simulation experiments indicate that, the remaining oil which is cut apart, dispersed, retented in small pores is displaced through visco-elasticity of polymer solution and residual oil are normally enriches in the middle of pore, and water further injected diverts into small pore where oil occupys originally and residual oil is different from that after waterflooding, and residual oil are mainly remained in middle and low permeability layers and residual oil saturation is 32.8~69.6% in low permeability layers.On the basis of the results from physical simulation experiments and aimed at the complicated geological structure, longterm development features, many commingled producers and injectors, frequent operations of H2III in Xia ermen Oilfield, some numerical simulation techniques are applied to the quantitive analysis of water flooded feature and remaining oil distribution after polymer flooding, and to the determination of the main facrtors of influence on remaining oil distribution and potential distribution. It includes optimized grid, stratified control of physical properties of reservior and fluid, accurate control dynamic data, refined history matching. Based on the above remaining oil distribution and potential, improving development effect of polymer flooding and subsequent waterflooding is studied. Areally, through infilling wells, matching production and injection, oil wells converting to water, to optimize injection-production system and to improve developed reserves; Vertically, through reperforation, water shut-off, profile modification, subdivision development and injection, etc. performance adjustment measures, to increase potential in middle and low permeability layers. Performance prediction results show that productivity will improves 2.52×10~4t, oil recovery rate is more than 1.03%, steady production period is prolonged for two years, and recovery will be enhanced by 2.05% and satisfactory results will have been obtained.The paper has complished the integrated study of the remaining oil distribution combinations of microscopic with macroscopic research, of qualitative with quantitive research, potential exploitation and result prediction, which has important directive effect on adjustment and expoitation of polymer flooding for other fields.
物理模拟实验表明,聚合物溶液通过本身的粘弹性可以驱替被分割、捕集、滞留在小孔道中的水驱残余油,聚合物驱后残余油主要分布于孔隙中央;后续注入水改向进入原来被油占据的小孔道,后续水驱后颗粒表面未残留下油膜,与水驱残余油明显不同;在纵向上聚合物驱后剩余油主要分布在中、低渗透层内,其中低渗透层的剩余油饱和度为32.8～69.6%。
本文在物理模拟实验研究结果的基础上,针对下二门H2III油组地质构造复杂、开发历史长、合采合注井多、作业措施频繁等特点和难点,采取了优化网格、分层系储层流体物性控制、精细动态数据控制和精细历史拟合等数值模拟研究技术,定量分析了聚合物驱后平面、纵向水淹状况和剩余油分布规律,确定了影响剩余油分布的主要因素和剩余潜力分布。以上述剩余油分布规律及潜力分布为基础,开展了改善聚合物驱及后续水驱开发效果途径研究,提出了剩余油挖潜的可行措施。平面上通过部署加密井、配产配注、老井转注,进一步完善了注采系统,提高储量动用程度;纵向上通过油水井补孔、堵水、调剖、分采、分注等动态调配措施,进一步提高了中低渗透层的潜力。动态预测结果表明,方案实施后,预计增加产能2.52×10~4t,采油速度大于1.03%,稳产期延长两年,采收率可以提高2.05个百分点,取得了良好的效果。
本文实现了聚合物驱后剩余油分布微观研究与宏观研究相结合、定性研究与定量研究相结合、剩余油调整挖潜及效果预测的一体化研究,对其它区块的聚合物驱开发调整挖潜具有重要的指导意义。
The results from laboratory and field test show that polymer flooding can improve 8~15% OOIP, but still 50% remaining oil underground after polymer flooding. Compared with that after waterflooding, the remaining oil is less, more scattered, and fluid property is more complicated, and exportation is more difficult after polymer flooding. So how to make clear residual oil distribution after polymer flooding and how to improve development effect of polymer flooding become the present main research subject.The results from physical simulation experiments indicate that, the remaining oil which is cut apart, dispersed, retented in small pores is displaced through visco-elasticity of polymer solution and residual oil are normally enriches in the middle of pore, and water further injected diverts into small pore where oil occupys originally and residual oil is different from that after waterflooding, and residual oil are mainly remained in middle and low permeability layers and residual oil saturation is 32.8~69.6% in low permeability layers.On the basis of the results from physical simulation experiments and aimed at the complicated geological structure, longterm development features, many commingled producers and injectors, frequent operations of H2III in Xia ermen Oilfield, some numerical simulation techniques are applied to the quantitive analysis of water flooded feature and remaining oil distribution after polymer flooding, and to the determination of the main facrtors of influence on remaining oil distribution and potential distribution. It includes optimized grid, stratified control of physical properties of reservior and fluid, accurate control dynamic data, refined history matching. Based on the above remaining oil distribution and potential, improving development effect of polymer flooding and subsequent waterflooding is studied. Areally, through infilling wells, matching production and injection, oil wells converting to water, to optimize injection-production system and to improve developed reserves; Vertically, through reperforation, water shut-off, profile modification, subdivision development and injection, etc. performance adjustment measures, to increase potential in middle and low permeability layers. Performance prediction results show that productivity will improves 2.52×10~4t, oil recovery rate is more than 1.03%, steady production period is prolonged for two years, and recovery will be enhanced by 2.05% and satisfactory results will have been obtained.The paper has complished the integrated study of the remaining oil distribution combinations of microscopic with macroscopic research, of qualitative with quantitive research, potential exploitation and result prediction, which has important directive effect on adjustment and expoitation of polymer flooding for other fields.
引文
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[6] HOVERSTEN G M, etal. Reservior characterization using cross well electromagnetic inversion, a feasibility study for the Snorre field, North Sea[J]. Geophysics, 2001, 66(4): 1177～1189
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[8] Dana George Wreath. A study of polymer flooding and residual oil saturation[D]. Austin, the University of Texas, 1989: 35～49
[9] Grag A, Kovscek A R, etal. CT scan and neural network technology for construction of detailed distribution of residual oil saturation during waterflooding[C]. SPE35737,1996: 695～710
[10] Seetharman Ganapathy. Simulation of heterogeneous sandstone experiments characterized using CT scanning[D]. Austin, the University of Texas, 1993: 87～95
[11] Meng wu Wang. Laboratory investigation of factors affecting residual oil saturation by polymer flooding[D]. Austin, the University of Texas, 1995: 9～21
[12] 李淑霞,陈月明,冯其红等.利用井间示踪剂确定剩余油饱和度的方法.石油勘探与开发,2001,28(2):73～75
[13] 宋考平,杨钊,舒志华等.聚合物驱剩余油微观分布的影响因素.大庆石油学院学报,2004,28(2):25～27
[14] 卢祥国,高振环,赵小京等.聚合物驱后剩余油分布规律研究.石油学报,1996,17(4):55～61
[15] 王为民,郭和坤,孙佃庆等.用核磁共振成像技术研究聚合物驱油过程.石油学报,1997,18(4):54～61
[16] 孙尚如,何先华,邬侠等.聚合物驱后剩余油分布核磁成像实验研究.大庆石油地质与开发,2003,22(4):61～63
[17] 胡雪涛,李允.随机网络模拟研究微观剩余油分布.石油学报,2000,7(4):152～156
[18] 高占京,马英俊,刘泽俊.特高含水期油田剩余油分布及开发调整数值模拟研究.中国海上油气(地质),1998,12(4):277～280
[19] 梁春秀,刘子良,马立文.裂缝性砂岩油藏周期注水实践.大庆石油地质与开发,2000,19(2):24～26
[20] 赵福麟,张贵才,解通成等.粘土双液法调剖封堵地层大孔道的研究.石油学报,1994,15(1):56～64
[21] 耿秋红,刘霞,李道亮.停注深抽和单井吞吐应用效果.大庆石油地质与开发,2002,21(5):45～47
[22] 赫恩杰,许爱云,陆蕙芸.任丘雾迷山组油藏目前开采方式调整的数值模拟研究.石油勘探与开发,1998,25(6):47～50
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