致密储层表活剂微观驱油特征实验研究.docx

西安石油大学本科毕业设计（论文）

致密储层表活剂微观驱油特征实验研究

摘要：表活剂驱油技术是提高石油采收率的重要方法之一。为了研究出在致密储层中不同化学物质的驱油效率的不同特征，通过对比找出最有效的驱油的化学物质，并研究其驱油特征。本文中通过真实砂岩模型研究了表活剂驱油与水驱油的特征，实验中包括单相驱替、水测、油驱水、水驱油、表活剂驱油5种驱替实验，经过统计数据，计算其渗透率，做出渗透率曲线，通过对比曲线分布特征判断出了表活剂的驱油效率最好。同时，研究表活剂微观驱油特征是通过在显微镜下观察不同时刻.的驱油面积来确定其的残余油分布特征，从而进一步计算其对应的含油面积和流度比，确定其驱油特征。实验结果表明，随着驱替压力的增大，表活剂驱油和水驱油的含油面积逐渐增大，岩石中的渗透率也逐渐增大，含油饱和度逐渐减小。同时实验证明了表活剂驱油效率大于水驱油效率。

关键词：表活剂；低渗致密储层；微观驱油特征；真实砂岩模型

Experimentalstudyonmicroscopicdisplacementcharacteristicsofsurfactantintightreservoir

Abstract:Surfactantfloodingtechnologyisoneoftheimportantmethodstoimproveoilrecovery.Inordertostudythereservoirindifferentchemicaloildisplacementefficiencyofdifferentcharacteristics,chemicalfloodingthroughcomparisontofindoutthemosteffective,andtostudytheoildisplacementcharacteristics.Throughtherealsandstonemodelofsurfactantfloodingandwaterfloodingcharacteristics,includingsingle-phasedisplacementexperimentwater,test,oilflooding,waterflooding,surfactantflooding5displacementexperiments,throughstatisticaldata,calculatethepermeability,makethepermeabilitycurvebycomparingthedistributioncurvetodeterminethedisplacementefficiencyofsurfactantisthebest.Atthesametime,studyofsurfactantfloodingismicrocharacteristicsthroughtheobservationofdifferenttimeintheareaofoilfloodingunderthemicroscopetodeterminetheTheresidualoildistribution,soastofurthercalculatethecorrespondingoil-bearingareaandmobilityratio,determinethefloodingcharacteristics.Theexperimentalresultsshowthatwiththeincreaseofpressureforflooding,surfactantfloodingandwaterfloodingoilareagraduallyincreases,therockpermeabilityincreases,oilsaturationdecreasesgradually.Atthesametimeexperimentprovedthatthesurfactantoildisplacementefficiencyishigherthantheefficiencyofwaterflooding.

Keywords:surfactant;lowpermeabilitytightreservoir;microscopicoildisplacementcharacteristics;truesandstonemodel

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