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时间:2020-06-06
《泡沫油衰竭开采后续水驱提高采收率实验研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、2014年第38卷中国石油大学学报(自然科学版)Vo1.38No.3第3期JournalofChinaUniversityofPetroleumJun.2014文章编号:1673~005(2O14)03O876d0i:10.3969/j.issn.1673~005.2014.03.014泡沫油衰竭开采后续水驱提高采收率实验研究李兆敏,王鹏,鹿腾,王壮壮,李松岩,刘尚奇,李星民(1.中国石油大学石油工程学院,山东青岛266580;2.中国石油勘探开发研究院,北京100083)摘要:通过物理模拟实验研究转驱压力和水驱速度对泡沫油衰竭开采后续水驱开发效果的影响,考察泡沫油水
2、驱机制。结果表明:泡沫油流阶段是稠油溶解气驱过程中的主要产油阶段,在这一阶段的采出程度占最终一次采收率的90.91%;衰竭开采后续水驱中,溶解气驱采收率随转驱压力的降低而逐渐增大,水驱采收率随转驱压力的降低而呈阶梯式规律逐渐减小,总采收率在拟泡点压力3.1MPa附近的开发效果最好,可达35.7l%;转驱压力可能通过影响泡沫油流中油气两相在孔隙介质中的分布影响水驱稳定性,并且这种影响在高含水期前较为明显,对高含水期影响较小;水的渗吸作用是水湿性多孔介质中见水后水驱泡沫油的主要动力,水驱速度越小,渗吸作用相对越强,水驱采收率越高,水驱速度由2.5降为0.OlmL/min时
3、水驱采收率可提高13.11%。关键词:提高采收率;泡沫油;水驱;转驱压力;拟泡点;渗吸作用中图分类号:TE341文献标志码:AExperimentalstudyonenhancedfoamyoilrecoveryaftersolutiongasdrivebywaterfloodingLIZhao—min,WANGPeng,LUTeng。,WANGZhuang—zhuang,LISong-yan,LIUShang-qi,LIXing—min(1.SchoolofPetroleumEngineeringinChinaUniversityofPetroleum,Qingda
4、o266580,China;2.ResearchInstituteofPetroleumExploration&Development,Beijing100083,Cn0)Abstract:Theinfluencesofpressureatinjectiontimingandinjectionrateonthewaterfloodingwereinvestigatedthroughphysicalsimulationexperiment,andthemechanismsoffoamyoilrecoverybywatefloodingwereexplored.There
5、sultsshowthatthefoamoilstreamisthemainrecoveryphaseduringthedissolvedgasdriveinheavyoil.whichdominates90.91%oftheprimaryrecoveryrate.Inthewaterfloodingofthenaturaldepletion,theprimaryrecoverygraduallyincreasesandthewa—terfloodrecoverydecreasesinasteppedlawwiththepressureatinjectiontimin
6、gdecreasing.Theultimaterecoveryreachesthemaximumof35.71%atthepseudo-bubblepointof3.1MPaapproximately.Thestabilityofwaterfloodingispossiblyin—fluencedbythevaryingdistributionofoilandgasinporousmediumarousedfromthedifferenceofcorepressure.Andthein—fluenceissignificantonlybeforethewatercut
7、ishigh.Waterimbibitionisthemainmechanismofdisplacementafterwaterbreakthroughinwaterwetmedium.Theeffectofwaterimbibitionrelativelyincreaseswiththedecreaseofinjectionrate,whichleadstoahigherrecovery.Thewaterfloodingrecoverycanbeimprovedby13.11%whenchangingtheinjectionratefrom2.5m
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