红河油田长8裂缝性致密储层微观水驱油特征
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摘要
红河油田长8储层基质物性差且普遍发育裂缝,注入水难以进入基质驱油并实现有效波及是当前面临的主要开发难题。为明确长8裂缝性致密储层的水驱油特征,改善水驱油效果,开展了恒速压汞及低速非达西渗流等试验研究,结果表明红河长8储层平均喉道半径仅0.82μm,孔喉组合以小孔—微细喉为主,且存在较明显的启动压力梯度,是导致长8储层吸水能力弱的主要因素;同时开展注入性评价和不同注入条件下的水驱油试验,结果表明长8储层有效注入并波及的压力条件为注入压力略低于裂缝重张压力,且远低于地层破裂压力;注水采油具有驱替—渗吸协同作用,等作用点储层渗透率为0.4mD;影响驱油效率的主要因素包括储层物性、不同储层组合方式、注入参数等。以此明确了长8储层以裂缝驱油+基质渗吸为主的驱油特征,并结合矿场注水开发试验,建立了适合红河长8裂缝性致密储层有效注水技术政策。
The matrix properties of Chang-8 reservoir in Honghe oilfield are poor,and the fractures are generally developed,so the water is difficult to enter the matrix with effectively displace and spread.In order to make clear the characteristics of water displacement and improve the effect of water flooding,the experiments of constant velocity mercury injection and low velocity non Darcy flow were studied.The results showed that the average throat radius of the Chang-8 reservoir is only about 0.82μm with small pore and micro fine throat assemblage and apparent start-up pressure gradient,which is the main factor that leads to weak water absorption capacity.The experiment of evaluation of injection and different injection conditions of water flooding showed that the conditions of effective injection and spread is the right injection pressure which is slightly lower than the fracture reopening pressure,and far lower than the formation fracture pressure.Water injection has a synergistic effect of displacement and imbibition,and the action point is 0.4 mD.The main influence factors of oil displacement efficiency include reservoir physical property,different reservoir combination,injection parameters,etc.The displacement characteristic of Chang-8 reservoir is fracture displacement & matrix imbibition.The suggestions which establish effective water injection technology policy is provided basing on the field water injection test in Chang-8 reservoir.
The matrix properties of Chang-8 reservoir in Honghe oilfield are poor,and the fractures are generally developed,so the water is difficult to enter the matrix with effectively displace and spread.In order to make clear the characteristics of water displacement and improve the effect of water flooding,the experiments of constant velocity mercury injection and low velocity non Darcy flow were studied.The results showed that the average throat radius of the Chang-8 reservoir is only about 0.82μm with small pore and micro fine throat assemblage and apparent start-up pressure gradient,which is the main factor that leads to weak water absorption capacity.The experiment of evaluation of injection and different injection conditions of water flooding showed that the conditions of effective injection and spread is the right injection pressure which is slightly lower than the fracture reopening pressure,and far lower than the formation fracture pressure.Water injection has a synergistic effect of displacement and imbibition,and the action point is 0.4 mD.The main influence factors of oil displacement efficiency include reservoir physical property,different reservoir combination,injection parameters,etc.The displacement characteristic of Chang-8 reservoir is fracture displacement & matrix imbibition.The suggestions which establish effective water injection technology policy is provided basing on the field water injection test in Chang-8 reservoir.
引文
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[9]吴锦伟,周思宾,张本艳,等.红河油田长8超低渗油藏水平井注水开发试验效果评价[J].石油地质与工程,2016,30(2):99-102.
[10]王国壮.鄂尔多斯盆地HH油田长8储层特征及流体快速识别研究[J].西安石油大学学报(自然科学版),2013,28(3):28-33.
[11]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.
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[14]曹雷,孙卫,盛军,等.低渗透致密油藏可动流体饱和度计算方法[J].长江大学学报(自然科学版),2016,13(20):1-8.
[15]胡作维,李云,王海红,等.鄂尔多斯盆地镇原地区长8油层组超低渗储层孔隙结构特征[J].岩性油气藏,2014,26(2):15-20.
[16]冯金德.裂缝性低渗透油藏渗流理论及油藏工程应用研究[D].北京:中国石油大学,2007:59-60.
[17]赵继勇,樊建明,何永宏,等.超低渗-致密油藏水平井开发注采参数优化实践:以鄂尔多斯盆地长庆油田为例[J].石油勘探与开发,2015,42(1):68-75.
[18]崔鹏兴,刘双双,党海龙.低渗透油藏渗吸作用及其影响因素研究[J].非常规油气,2017,4(1):88-93.
[2]孙卫,曲志浩,李劲峰.安塞特低渗透油田见水后水驱油机理及开发效果分析[J].石油实验地质,1999,21(3):256-260.
[3]杨克文,史成恩,万晓龙等.鄂尔多斯盆地长8、长6天然裂缝差异性研究及其对开发的影响[J].西安石油大学学报(自然科学版),2008,23(6):37-41.
[4]付晓燕,孙卫.低渗透储集层微观水驱油机理研究:以西峰油田庄19井区长82储集层为例[J].新疆石油地质,2005,26(6):681-683.
[5]何文祥,杨亿前,马超亚.特低渗透率储层水驱油规律实验研究[J].岩性油气藏,2010,22(4):109-111.
[6]黄俊,张誉才,鲁军辉.超低渗油藏有效开发技术研究[J].重庆科技学院学报(自然科学版),2014,16(2):87-90.
[7]任大忠,孙卫,赵继勇,等.鄂尔多斯盆地岩性油藏微观水驱油特征及影响因素:以华庆油田长81油藏为例[J].中国矿业大学学报,2015,44(6):1043-1052.
[8]肖承钰,尹伟,张颖等.鄂尔多斯镇泾地区延长组成藏体系与油气富集模式[J].石油实验地质,2015,37(3):347-353.
[9]吴锦伟,周思宾,张本艳,等.红河油田长8超低渗油藏水平井注水开发试验效果评价[J].石油地质与工程,2016,30(2):99-102.
[10]王国壮.鄂尔多斯盆地HH油田长8储层特征及流体快速识别研究[J].西安石油大学学报(自然科学版),2013,28(3):28-33.
[11]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.
[12]李道品,等.低渗透砂岩油田开发[M].北京:石油工业出版社,1997:4-9.
[13]骆雨田,杨正明,何英,等.致密油储层特征及有效动用研究[J].非常规油气,2014,1(1):47-54.
[14]曹雷,孙卫,盛军,等.低渗透致密油藏可动流体饱和度计算方法[J].长江大学学报(自然科学版),2016,13(20):1-8.
[15]胡作维,李云,王海红,等.鄂尔多斯盆地镇原地区长8油层组超低渗储层孔隙结构特征[J].岩性油气藏,2014,26(2):15-20.
[16]冯金德.裂缝性低渗透油藏渗流理论及油藏工程应用研究[D].北京:中国石油大学,2007:59-60.
[17]赵继勇,樊建明,何永宏,等.超低渗-致密油藏水平井开发注采参数优化实践:以鄂尔多斯盆地长庆油田为例[J].石油勘探与开发,2015,42(1):68-75.
[18]崔鹏兴,刘双双,党海龙.低渗透油藏渗吸作用及其影响因素研究[J].非常规油气,2017,4(1):88-93.