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1、石油勘探与开发2013年8月PETROLEUMEXPLORATIONANDDEVELOPMENTVol.40No.4481文章编号:1000-0747(2013)04-0481-05DOI:10.11698/PED.2013.04.14温度对页岩等温吸附/解吸特征影响1,21,21,21,222郭为,熊伟,高树生,胡志明,刘洪林,于荣泽(1.中国科学院渗流流体力学研究所;2.中国石油勘探开发研究院廊坊分院)基金项目:国家重大科技专项“页岩气开发机理及技术政策研究”(2011ZX05018-005)摘要:采用川南地区龙马溪组页岩样品,设计页岩吸附/解吸实验,研究
2、不同温度下页岩的等温吸附/解吸特征。不同温度下页岩吸附/解吸特征实验结果表明,温度影响页岩的吸附量以及解吸量,温度升高,页岩的吸附量减少;页岩的吸附曲线和解吸曲线不重合,解吸曲线滞后,其热力学原因在于页岩吸附过程的等量吸附热大于解吸过程的等量吸附热;Langmuir模型与解吸式模型分别能很好地描述等温吸附和解吸过程。利用等量吸附热曲线可以预测不同温度下的页岩等温吸附和解吸曲线,理论计算结果与实验结果误差较小。页岩气在生产过程中为解吸过程,页岩气的解吸规律直接影响页岩气井的产量,页岩气产能预测以及数值模拟中应该考虑用解吸模型。图9表4参19关键词:页岩;温度;吸
3、附;解吸;等量吸附热中图分类号:TE132.2文献标识码:AImpactoftemperatureontheisothermaladsorption/desorptioncharacteristicsofshalegas1,21,21,21,222GuoWei,XiongWei,GaoShusheng,HuZhiming,LiuHonglin,YuRongze(1.InstituteofPorousFluidMechanics,ChineseAcademyofSciences,Langfang065007,China;2.LangfangBranchofPet
4、roChinaResearchInstituteofPetroleumExploration&Development,Langfang065007,China)Abstract:IsothermaladsorptionanddesorptionexperimentsunderdifferenttemperatureswerecarriedoutwiththeLongmaxiFormationshalesamplescollectedfromsouthernSichuan.Theexperimentalresultsshowthattemperatureaffe
5、ctstheadsorptionanddesorptioncapacityofshale,theadsorptioncapacityofshaledecreaseswithtemperatureincrease.Theadsorptioncurveanddesorptioncurveofshalearenotcoincidentandthethermodynamicreasonforthehysteresisofthedesorptioncurveisthattheisostericheatoftheshaleadsorptionprocessisgreate
6、rthanthatofthedesorptionprocess.TheLangmuirmodelanddesorptionmodelcandescribetheisothermaladsorptionanddesorptionprocessesverywell,respectively.Isothermaladsorptionanddesorptioncurvesunderdifferenttemperaturescanbepredictedbyisostericheatcurveswhichmatchtheexperimentalresults.Shaleg
7、asproductionisaprocessofgasdesorptionandthedesorptioncharacteristicsdirectlyimpacttheproductionofshalegas,sothedesorptionmodelshouldbetakenintoconsiderationintheshalegasproductionforecastandnumericalsimulation.Keywords:shale;temperature;adsorption;desorption;isostericadsorptionheat0
8、引言吸实验,发现煤的等温吸附和解吸曲线