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1、第40卷第3期石油钻采工艺Vol.40No.32018年5月OILDRILLING&PRODUCTIONTECHNOLOGYMay2018文章编号:1000–7393(2018)03–0354–07DOI:10.13639/j.odpt.2018.03.014致密储层CO2压裂裂缝扩展规律数值模拟11211张健 张国祥 邹雨时 赵文韬 王金意1.中国华能集团清洁能源技术研究院有限公司;2.中国石油大学(北京)引用格式:张健,张国祥,邹雨时,赵文韬,王金意.致密储层CO2压裂裂缝扩展规律数值模拟[J].石油钻采工艺,2018,40(3):354-360,368.摘要:CO2压裂
2、具有节约水资源、降低储层伤害等优点,并已在矿场实践中取得良好效果。为认清CO2压裂裂缝扩展规律,基于流体流动、热传导和固体力学方程,建立CO2压裂裂缝扩展热流固耦合模型。采用有限元法求解该模型,并与解析解对比验证模型可靠性。根据数值模型对CO2压裂裂缝扩展进行参数敏感性分析,结果表明:CO2在渗透率高于0.01mD的地层中滤失量较大,地层破裂前增压速率较低,缝长和缝宽较小;CO2黏度显著影响压力扩散和裂缝几何尺寸;注入排量对起裂压力影响较小,但会改变地层破裂前增压速率和延伸压力;热应力造缝是CO2压裂造缝机理之一,地层与注入液的温度差越大,热应力越大,地层起裂压力越小,裂缝延
3、伸越容易。研究结果可为CO2干法压裂设计提供参考。关键词:致密储层;CO2压裂;裂缝扩展;热流固耦合;有限元;热应力中图分类号:TE357.1 文献标识码:ANumericalsimulationonthefracturepropagationlawsofCO2fracturingintightreservoirs11211ZHANGJian,ZHANGGuoxiang,ZOUYushi,ZHAOWentao,WANGJinyi1.HuanengCleanEnergyResearchInstitute,Beijing102249,China;2.ChinaUniversi
4、tyofPetroleum(Beijing),Beijing102249,ChinaCitation:ZHANGJian,ZHANGGuoxiang,ZOUYushi,ZHAOWentao,WANGJinyi.Numericalsimulationonthefractureprop-agationlawsofCOfracturingintightreservoirs[J].OilDrilling&productionTechnology,2018,40(3):354-360,368.2Abstract:COfracturingisadvantageousinsavingwat
5、erresourcesandreducingreservoirdamage,anditsfieldapplicationeffectis2good.InordertofigureoutthefracturepropagationlawsofCOfracturing,thethermo-hydro-mechanicalcouplingmodelforsimulating2thefracturepropagationofCOfracturingwasestablishedonthebasisoffluidflowing,thermalconductionandsolidmecha
6、nicsequa-2tion.Then,thismodelwassolvedbymeansoffiniteelementmethodandcomparedwiththeanalyticalsolutiontoverifyitsreliability.Finally,parametersensitivityanalysiswasconductedonthefracturepropagationofCOfracturingbyusingthenumericalmodel.Itis2indicatedthatthepressureincreasingrateislowerbefor
7、eformationfracturing,thefracturelengthandwidthareshortandtheCOfiltra-2tionrateishigherintheformationwhosepermeabilityishigherthan0.01mD.COviscosityhassignificanteffectonpressurediffusion2andfracturegeometry.Injectionratehaslesseffectontheinitialpressure,