基于不同裂缝发育程度下周期注水注采参数优化研究
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摘要
针对裂缝性油藏非均质性强,裂缝发育程度对周期注水开发效果影响较大的问题,利用数值模拟软件,建立实验室条件下数值模型,反演三维物理模拟水驱油实验。在此基础上对比不同裂缝发育程度下周期注水增油效果,实现不同裂缝发育程度下周期注水注采参数定量优化(包括注水时机、注采比和间注时间)。研究表明:与常规注水相比,裂缝分布越不均匀,储层非均质性越强,周期注水增油降水效果越明显;注水时机对采收率的影响表现为单调性,注水间歇和注采比对采收率的影响表现为非单调性,合理的间注时间为65～105 d,注水阶段合理的注采比为1. 64～1. 96。裂缝分布越不均匀,间注时间相应延长,注采比相应减小。研究成果指导了锦州A油田优化注水工作,老井区实现累计增油6. 9×10~4m~3,含水率降低7. 2个百分点,新井区预计采收率可以提高1. 3个百分点。研究成果对裂缝性油藏开展周期注水矿场实践具有重要的指导意义。
Aiming at the problem that the fractured reservoir has high heterogeneity and the fracture development level has great influence on the development effect of cyclic water injection,the numerical simulation software was used to build a numerical model under laboratory conditions to invert 3D physical modeling water displacing oil experiment. On the basis of which,the oil increasing effect of cyclic water injection at different fracture development levels were compared,and the quantitative optimization of injection-production parameters( including injection timing,injection-production ratio and intermittent injection time) of cyclic water injection at different fracture development levels was realized. The study results show that compared with conventional water injection,the more uneven the fracture distribution,the stronger the reservoir heterogeneity,the more obvious the oil increasing and water decreasing effect of cyclic water injection; the influence of injection timing on recovery factor is monotonic,the effect of injection intermittence and injection-production ratio on recovery factor is non-monotonic,the reasonable intermittent injection time is 65-105 d,and the reasonable injection-production ratio at flooding stage is 1. 64-1. 96. When the fracture distribution is more uneven,the intermittent injection time should be prolonged correspondingly,and the injection-production ratio should be decreased correspondingly. The study achievements have guided the optimization of water injection in Jinzhou A oilfield,the cumulative incremental oil of old wellblocks is 6.9×10~4 m~3,the water cut is decreased by 7.2 percentage points,and the recovery factor of new wellblocks is predicted to be increased by 1.3 percentage points. The study achievements are very instructive for field practice of cyclic water injection in fractured reservoirs.
Aiming at the problem that the fractured reservoir has high heterogeneity and the fracture development level has great influence on the development effect of cyclic water injection,the numerical simulation software was used to build a numerical model under laboratory conditions to invert 3D physical modeling water displacing oil experiment. On the basis of which,the oil increasing effect of cyclic water injection at different fracture development levels were compared,and the quantitative optimization of injection-production parameters( including injection timing,injection-production ratio and intermittent injection time) of cyclic water injection at different fracture development levels was realized. The study results show that compared with conventional water injection,the more uneven the fracture distribution,the stronger the reservoir heterogeneity,the more obvious the oil increasing and water decreasing effect of cyclic water injection; the influence of injection timing on recovery factor is monotonic,the effect of injection intermittence and injection-production ratio on recovery factor is non-monotonic,the reasonable intermittent injection time is 65-105 d,and the reasonable injection-production ratio at flooding stage is 1. 64-1. 96. When the fracture distribution is more uneven,the intermittent injection time should be prolonged correspondingly,and the injection-production ratio should be decreased correspondingly. The study achievements have guided the optimization of water injection in Jinzhou A oilfield,the cumulative incremental oil of old wellblocks is 6.9×10~4 m~3,the water cut is decreased by 7.2 percentage points,and the recovery factor of new wellblocks is predicted to be increased by 1.3 percentage points. The study achievements are very instructive for field practice of cyclic water injection in fractured reservoirs.
引文
[1]房娜,姜光宏,李云鹏,等.潜山裂缝油藏开发特征及挖潜方向[J].特种油气藏,2017,24(3):90-94.
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[13]赵春森,吕建荣.大庆油田葡北二断块南部周期注水应用方法研究[J].油气地质与采收率,2008,15(6):76-79.
[14]李爱芬,凡田友,赵琳.裂缝性油藏低渗透岩心自发渗吸实验研究[J].油气地质与采收率,2011,18(5):67-69,77.
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[19]崔云江,吕洪志.锦州25-1南油气田裂缝性潜山储层测井评价[J].中国海上油气,2008,20(2):92-95.
[20]黄保纲,汪利兵,赵春明,等.JZS油田潜山裂缝储层形成机制及分布预测[J].石油天然气地质,2011,32(54):710-717.
[21]周心怀,项华,于水,等.渤海锦州南变质岩潜山油藏储集层特征与发育控制因素[J].石油勘探与开发,2015,32(6):17-20.
[22]隆锋.低渗透裂缝型油田周期注水参数优化[J].大庆石油地质与开发,2017,36(5):114-118.
[23]陈阳,韩大伟,卢祥国,等.缝网压裂裂缝形态对低渗油藏渗吸采油效果影响实验[J].大庆石油地质与开发,2017,36(4):123-127.
[24]肖淑蓉,张跃明.辽河盆地基岩潜山油藏裂缝型储层特征[J].中国海上油气(地质),2000,14(2):108-111.
[25]ISLAM MA,SKALLE P.An experimental investigation of shale mechanical properties through drained and undrained test mechanisms[J].Rock Mechanics&Rock Engineering,2013,46(6):1391-1413.
[26]张云峰,王磊,李晶.海拉尔盆地苏德尔特古潜山裂缝发育特征[J].大庆石油学院学报,2006,30(5):4-6.
[27]孙永河,万军,付晓飞,等.贝尔凹陷断裂演化特征及其对潜山裂缝的控制[J].石油勘探与开发,2007,34(3):3l6-322.
[28]柴燕军,韩小峰.利用岩电资料研究变质岩古潜山裂缝发育分布规律[J].特种油气藏,2002,9(增刊):490-496.
[29]肖淑蓉,张跃明.辽河盆地基岩潜山油藏裂缝型储层特征[J].中国海上油气(地质),2000,14(2):108-111.
[30]付志方,陈志海,高君,等.PCO低渗透砂岩油藏裂缝特征综合描述[J].大庆石油地质与开发,2017,36(2):129-134.
[31]王一帆,黄东安,闫博,等.考虑弹塑性变形机制的储层天然裂缝闭合模型[J].大庆石油地质与开发,2017,36(1):75-80.
[2]柏松章,唐飞.裂缝性潜山基岩油藏开发模式[M].北京:石油工业出版社,1997:18-78.
[3]郑应钊,刘国利,马彩琴,等.多条件约束地质建模技术在青西油田裂缝性油藏中的应用[J].油气地质与采收率,2011,18(3):77-80,93.
[4]王小林,王杰祥,王德林,等.尕斯库勒油田周期注水试验研究[J].特种油气藏,2005,12(6):50-54.
[5]黄延章.用核磁共振成象技术研究周期注水驱油机理[J].石油学报,1995,16(4):62-67.
[6]陈军斌,李汤玉.周期注水数值模拟研究数学模型[J].西安石油学院学报(自然科学版),1999,14(3):6-9.
[7]宋万超.高含水期油田开发技术和方法[M].北京:地质出版社,2003,20-32.
[8]何芬,李涛.周期注水提高水驱效率技术研究[J].特种油气藏,2004,11(3):53-55.
[9]张进平.砂岩油藏不稳定注水技术及应用效果监测方法[J].测井技术,2006,10(5):445-447.
[10]张福青,牟学益,马洪飞,等.桩西油田桩45-1块周期注水实践与认识[J].油气地质与采收率,2003,10(1):47-49.
[11]龚姚进,梁光迅.沈625块裂缝型低潜山油藏注水开发主要做法及效果评价[J].特种油气藏,2007,14(2):93-96.
[12]田平,许爱云,张旭,等.任丘油田开发后期不稳定注水开发效果评价[J].石油学报,1999,20(1):38-42.
[13]赵春森,吕建荣.大庆油田葡北二断块南部周期注水应用方法研究[J].油气地质与采收率,2008,15(6):76-79.
[14]李爱芬,凡田友,赵琳.裂缝性油藏低渗透岩心自发渗吸实验研究[J].油气地质与采收率,2011,18(5):67-69,77.
[15]俞启泰,张素芳.周期注水的油藏数值模拟研究[J].石油勘探与开发,1993,20(6):46-53.
[16]张继春,柏松章,张亚娟,等.周期注水实验及增油机理研究[J].石油学报,2003,24(2):76-80.
[17]袁士义,宋新民,冉启全.裂缝性油藏开发技术[M].北京:石油工业出版社,2004:32-56.
[18]童凯军,赵春明,吕坐彬,等.渤海变质岩潜山油藏储集层综合评价与裂缝表征[J].石油勘探与开发,2012,39(1):56-63.
[19]崔云江,吕洪志.锦州25-1南油气田裂缝性潜山储层测井评价[J].中国海上油气,2008,20(2):92-95.
[20]黄保纲,汪利兵,赵春明,等.JZS油田潜山裂缝储层形成机制及分布预测[J].石油天然气地质,2011,32(54):710-717.
[21]周心怀,项华,于水,等.渤海锦州南变质岩潜山油藏储集层特征与发育控制因素[J].石油勘探与开发,2015,32(6):17-20.
[22]隆锋.低渗透裂缝型油田周期注水参数优化[J].大庆石油地质与开发,2017,36(5):114-118.
[23]陈阳,韩大伟,卢祥国,等.缝网压裂裂缝形态对低渗油藏渗吸采油效果影响实验[J].大庆石油地质与开发,2017,36(4):123-127.
[24]肖淑蓉,张跃明.辽河盆地基岩潜山油藏裂缝型储层特征[J].中国海上油气(地质),2000,14(2):108-111.
[25]ISLAM MA,SKALLE P.An experimental investigation of shale mechanical properties through drained and undrained test mechanisms[J].Rock Mechanics&Rock Engineering,2013,46(6):1391-1413.
[26]张云峰,王磊,李晶.海拉尔盆地苏德尔特古潜山裂缝发育特征[J].大庆石油学院学报,2006,30(5):4-6.
[27]孙永河,万军,付晓飞,等.贝尔凹陷断裂演化特征及其对潜山裂缝的控制[J].石油勘探与开发,2007,34(3):3l6-322.
[28]柴燕军,韩小峰.利用岩电资料研究变质岩古潜山裂缝发育分布规律[J].特种油气藏,2002,9(增刊):490-496.
[29]肖淑蓉,张跃明.辽河盆地基岩潜山油藏裂缝型储层特征[J].中国海上油气(地质),2000,14(2):108-111.
[30]付志方,陈志海,高君,等.PCO低渗透砂岩油藏裂缝特征综合描述[J].大庆石油地质与开发,2017,36(2):129-134.
[31]王一帆,黄东安,闫博,等.考虑弹塑性变形机制的储层天然裂缝闭合模型[J].大庆石油地质与开发,2017,36(1):75-80.
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