高倾角低渗断块油藏顶部注气规律研究
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摘要
对于高倾角低渗透断块油藏,水驱对顶部剩余油的动用效果较差。采用顶部注气的驱替方式,充分利用高倾角的地质特征,能有效提高该类油藏的采出程度。从角度对比了气体辅助重力驱,以及人工气顶驱两种主要的顶部注气方式,利用数值模拟方法,建立了某区块的油藏数值模型;以区块采出程度为目标优选了顶部注气驱方式。研究表明,人工气顶驱对该类油藏具有较好的适应性,可大幅度提高采收率。针对人工气顶驱的开发特征对相关工艺参数进行单因素分析,并加以正交试验优化工艺参数。结果表明:对于高倾角低渗透断块油藏进行人工气顶驱时,注气量为主要影响参数,其次为注采周期及闷井时长,注气速度对采出程度的影响最不敏感;同时,对于所研究的区块,优选注气速度为7 000 m3/d、注气量为9.00×107m3、注采周期时长为30 d,闷井时长80 d。
Water flooding has bad effect on the use of remaining oil for fault reservoir with low permeability and high dip. The drive of crestal injection can make the best of high dip and effectively enhance recovery. Gas-assisted gravity drainage with artificial gas cap drive was compared. And favor a better way for a block with numerical simulation method. Artificial gas cap drive has good adaptability for this kind of reservoir,and with the development feature of it,univariate analysis and optimization study are made for relative technical parameters. The result shows that for artificial gas cap drive the volume of gas injection is the key point to recovery,and then the injection-production cycle and the closed time,gas injection velocity is the least sensitive factor. For the block,optimizing gas injection velocity is 7 000 m3/ d,the volume of gas injection is 9. 00 × 107m3,the injection-production cycle is 30 days and the closed time is 80 days.
Water flooding has bad effect on the use of remaining oil for fault reservoir with low permeability and high dip. The drive of crestal injection can make the best of high dip and effectively enhance recovery. Gas-assisted gravity drainage with artificial gas cap drive was compared. And favor a better way for a block with numerical simulation method. Artificial gas cap drive has good adaptability for this kind of reservoir,and with the development feature of it,univariate analysis and optimization study are made for relative technical parameters. The result shows that for artificial gas cap drive the volume of gas injection is the key point to recovery,and then the injection-production cycle and the closed time,gas injection velocity is the least sensitive factor. For the block,optimizing gas injection velocity is 7 000 m3/ d,the volume of gas injection is 9. 00 × 107m3,the injection-production cycle is 30 days and the closed time is 80 days.
引文
1王国民,高江取,刘孔章,等.复杂断块油藏氮气驱提高采收率技术研究.特种油气藏,2004;11(3):1-3Wang G M,Gao J Q,Liu K Z,et al.Research for nitrogen gas flooding enhanced oil recovery in complex fault block reservoir.Special Oil&Gas Reservoirs,2004;11(3):1-3
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3熊钰,孙良田,孙雷,等.倾斜多层油藏注N2非混相驱合理注气速度研究.西南石油学院学报,2002;24(5):34-36Xiong Y,Sun L T,Sun L,et al.Study on reasonable gas injection of n2 immiscible flooding in inclined multilayer reservoir.Journal of Southwest Petroleum Institute,2002;24(5):34-36
4梁淑贤,周炜,张建东.顶部注气稳定重力驱技术有效应用探讨.西南石油大学学报:自然科学版,2014;4(1):1-4Liang S X,Zhou W,Zhang J D.Discussion on the effective application of the top gas injection stable gravity drive technology.Journal of Southwest Petroleum University,2014;4(1):1-4
5 Mahmoud T,Rao D N.Mechanism and performance demonstration of the gas-assisted gravity-drainage process using visual models.SPE110132,2007
6 Norollah K,Bashiri A.Gas-assisted gravity drainage(GAGD)prosess for improved oil recovery.SPE 13244,2009
7 Kulkarni M M,Rao D N.Characterization of operative mechanisms in gravity drainage field projects through dimensional analysis.SPE103230,2006
2白凤翰,申友青,孟庆春,等.雁翎油田注氮气提高采收率现场试验.石油学报,1998;19(4):61-68Bai F H,Shen Y Q,Meng Q C,et al.The field test of nitrogen injection enhanced oil recovery in yanling field.Journal of Petroleum,1998;19(4):61-68
3熊钰,孙良田,孙雷,等.倾斜多层油藏注N2非混相驱合理注气速度研究.西南石油学院学报,2002;24(5):34-36Xiong Y,Sun L T,Sun L,et al.Study on reasonable gas injection of n2 immiscible flooding in inclined multilayer reservoir.Journal of Southwest Petroleum Institute,2002;24(5):34-36
4梁淑贤,周炜,张建东.顶部注气稳定重力驱技术有效应用探讨.西南石油大学学报:自然科学版,2014;4(1):1-4Liang S X,Zhou W,Zhang J D.Discussion on the effective application of the top gas injection stable gravity drive technology.Journal of Southwest Petroleum University,2014;4(1):1-4
5 Mahmoud T,Rao D N.Mechanism and performance demonstration of the gas-assisted gravity-drainage process using visual models.SPE110132,2007
6 Norollah K,Bashiri A.Gas-assisted gravity drainage(GAGD)prosess for improved oil recovery.SPE 13244,2009
7 Kulkarni M M,Rao D N.Characterization of operative mechanisms in gravity drainage field projects through dimensional analysis.SPE103230,2006