考虑岩石压缩系数应力敏感的能量补充时间
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摘要
AR低渗透油田的岩石压缩系数应力敏感显著。但是,目前没有同时考虑启动压力梯度和岩石压缩系数应力敏感的能量补充时机的油藏工程计算方法。因此,文中通过室内物理实验研究了AR油田的岩石压缩系数应力敏感特征,将岩石压缩系数随着地层压力变化和地层压力分布差异而不同的特性考虑在内,建立了一种新的低渗透油田的能量补充时机计算方法。研究表明:当不同岩心的压缩系数应力敏感程度相同时,初始岩石压缩系数越大,弹性驱开发过程中的平均岩石压缩系数越大,因此地层压力消耗速度越慢,弹性驱采收率越高,需要补充能量的时间越晚;当不同岩心的初始压缩系数相同时,应力敏感程度越严重,压力消耗越快,弹性驱开发过程的平均压力越低,导致弹性驱采收率越低,需要补充能量的时间越早。AR油田在考虑岩石压缩系数应力敏感影响时的能量补充时间为83 d,较不考虑岩石压缩系数应力敏感时补充能量的时间大幅度提前。
The rock compressibility stress sensitivity(RCSS) of low permeability oil reservoir in AR oilfield is obvious. However, there is not a reservoir engineering method which can consider threshold pressure gradient and RCSS at the same time. Therefore, RCSS characteristics of AR field are studied in this paper by laboratory physics experiment. Since rock compressibility changes when formation pressure changes or formation pressure distribution is different, this paper builds a new method to calculate energy replenishment time. The research shows that with the same RCSS, the larger the original rock compressibility, the larger the average rock compressibility, the longer the time of formation pressure depletion, the higher the recovery, the longer the energy replenish time.With the same rock compressibility, the larger the RCSS, the shorter the time of formation pressure depletion, the lower the recovery,the shorter the energy replenish time. Taking RCSS into account, AR field′s energy replenish time is 83 days. Compared to the case which does not take RCSS into account, energy replenishment time becomes shorter greatly.
The rock compressibility stress sensitivity(RCSS) of low permeability oil reservoir in AR oilfield is obvious. However, there is not a reservoir engineering method which can consider threshold pressure gradient and RCSS at the same time. Therefore, RCSS characteristics of AR field are studied in this paper by laboratory physics experiment. Since rock compressibility changes when formation pressure changes or formation pressure distribution is different, this paper builds a new method to calculate energy replenishment time. The research shows that with the same RCSS, the larger the original rock compressibility, the larger the average rock compressibility, the longer the time of formation pressure depletion, the higher the recovery, the longer the energy replenish time.With the same rock compressibility, the larger the RCSS, the shorter the time of formation pressure depletion, the lower the recovery,the shorter the energy replenish time. Taking RCSS into account, AR field′s energy replenish time is 83 days. Compared to the case which does not take RCSS into account, energy replenishment time becomes shorter greatly.
引文
[1]何逸凡,石洪福,刘英宪.基于启动压力梯度等效表征的低渗透油藏数值模拟[J].断块油气田,2017,24(4):510-513.
[2]田虓丰,程林松,薛永超,等.鄂尔多斯盆地陇东地区长7致密油藏储层特征[J].科学技术与工程,2014,14(12):173-176.
[3]田巍,朱维耀,朱华银,等.致密砂岩启动压力梯度数值的影响因素[J].断块油气田,2014,21(5):611-614.
[4]田虓丰,田冀,朱国金,等.致密砂岩油藏非线性弯曲段的数值模拟研究[J].科学技术与工程,2017,17(35):32-39.
[5]闫健,齐银,刘晓娟.低渗油藏束缚水下油相启动压力梯度分析[J].断块油气田,2014,21(3):344-347.
[6]毛小龙,刘月田,关文龙,等.考虑颗粒变形和颗粒间变形的孔隙压缩系数[J].断块油气田,2018,25(3):332-335.
[7]薛清太.地层上覆压力下物性参数特征研究[J].油气地质与采收率,2005,12(6):43-45.
[8]李子丰,郑义清.油气藏多孔岩石鼓胀压缩特性表征方法探讨[J].石油钻探技术,2018,46(3):1-6.
[9]王新海,宋岩,方海飞,等.岩石压缩系数变化规律研究[J].石油天然气学报,2007,29(1):42-44.
[10]徐春碧,黄小亮,唐海,等.低渗透油藏注水开发时机研究[J].钻采工艺,2011,34(2):53-55.
[11]张晓亮.低渗透油藏弹性驱和溶解气驱采收率计算[J].辽宁工程技术大学学报(自然科学版),2014,33(5):633-636.
[12]陈民锋,李晓风,王敏,等.深水油田高饱和油藏能量合理补充时机研究[J].深圳大学学报(理工版),2013,30(6):649-653.
[13]陈民锋,赵梦盼,王敏,等.低渗透高饱和油藏能量合理补充时机研究[J].断块油气田,2014,21(4):463-466.
[14]马铨峥,杨胜来,吕道平,等.致密储层弹性采收率规律及影响因素研究:以新疆吉木萨尔盆地芦草沟组为例[J].科学技术与工程,2016,16(27):147-151.
[15]油气田开发专业标准委员会.岩石孔隙体积压缩系数测定方法:SY/T 5815—2008[S].北京:石油工业出版社,2010:2-4.
[16] ZENG B,CHENG L,HAO F. Experiment and mechanism analysis on threshold pressure gradient with different fluids[R]. SPE 140678,2010.
[2]田虓丰,程林松,薛永超,等.鄂尔多斯盆地陇东地区长7致密油藏储层特征[J].科学技术与工程,2014,14(12):173-176.
[3]田巍,朱维耀,朱华银,等.致密砂岩启动压力梯度数值的影响因素[J].断块油气田,2014,21(5):611-614.
[4]田虓丰,田冀,朱国金,等.致密砂岩油藏非线性弯曲段的数值模拟研究[J].科学技术与工程,2017,17(35):32-39.
[5]闫健,齐银,刘晓娟.低渗油藏束缚水下油相启动压力梯度分析[J].断块油气田,2014,21(3):344-347.
[6]毛小龙,刘月田,关文龙,等.考虑颗粒变形和颗粒间变形的孔隙压缩系数[J].断块油气田,2018,25(3):332-335.
[7]薛清太.地层上覆压力下物性参数特征研究[J].油气地质与采收率,2005,12(6):43-45.
[8]李子丰,郑义清.油气藏多孔岩石鼓胀压缩特性表征方法探讨[J].石油钻探技术,2018,46(3):1-6.
[9]王新海,宋岩,方海飞,等.岩石压缩系数变化规律研究[J].石油天然气学报,2007,29(1):42-44.
[10]徐春碧,黄小亮,唐海,等.低渗透油藏注水开发时机研究[J].钻采工艺,2011,34(2):53-55.
[11]张晓亮.低渗透油藏弹性驱和溶解气驱采收率计算[J].辽宁工程技术大学学报(自然科学版),2014,33(5):633-636.
[12]陈民锋,李晓风,王敏,等.深水油田高饱和油藏能量合理补充时机研究[J].深圳大学学报(理工版),2013,30(6):649-653.
[13]陈民锋,赵梦盼,王敏,等.低渗透高饱和油藏能量合理补充时机研究[J].断块油气田,2014,21(4):463-466.
[14]马铨峥,杨胜来,吕道平,等.致密储层弹性采收率规律及影响因素研究:以新疆吉木萨尔盆地芦草沟组为例[J].科学技术与工程,2016,16(27):147-151.
[15]油气田开发专业标准委员会.岩石孔隙体积压缩系数测定方法:SY/T 5815—2008[S].北京:石油工业出版社,2010:2-4.
[16] ZENG B,CHENG L,HAO F. Experiment and mechanism analysis on threshold pressure gradient with different fluids[R]. SPE 140678,2010.