油藏物理学油藏物理学 (24).ppt

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1、3 Wettability of reservoir rock and its affecting factors water-wetWettability of reservoir rock oil-wet surface heterogeneous wettability 1)Wettability of reservoir rockmixed wettingPartial wettingTreibelet al.(1972)Partial wettabilityMixed wettability2)Factors affecting wettability of reservoir ro

2、ck A.Effectofthemineralogyoftherocksurfaceonwettability B.Effectofthechemicalcompositionsofthefluidsonwettability C.EffectofsurfaceactivesubstanceD.EffectofmineralsurfaceroughnessE.EffectofwaterinjectiononrockwettabilityA.Effect of rock mineralogyon wettability hydrophilic mineral:Quartz,Feldspar,Ca

3、rbonate lipophilic mineral:Talcum,Graphite,Hydrocarbon organic-solidClay mineral has great influence on rock wettabilityThe montmorillonite(蒙脱石蒙脱石)has hygroscopicity,will increase the rock hydrophilicity;The iron bearing clay(含铁粘土矿物含铁粘土矿物)may adsorb surface-active substance in crude oil,causing the

4、rock surface turn to lipophilic,as chlorite(绿泥石绿泥石).Effect of Composition of Crude Oil Table3-1 Advancing angle of different hydrocarbon compound component on teflon surfacehydrocarbonhydrocarbon pentane pentane (戊戊烷烷)C C5 5H H1212 hexane hexane (己己烷烷)C C6 6H H1414 otcane otcane (辛辛烷烷)C C8 8H H1818

5、dodecane dodecane (十二烷十二烷)C C1212H H2626Advancing Advancing angleangle 0 00 0 8 80 0 26 260 0 42 420 0B.EffectofthechemicalcompositionsofthefluidsonwettabilityEffect of Composition of Crude OilPolarorganiccompoundsincrudeoilcanreactwiththesurface,formingapreferentiallyoil-wetsurface.Effect of compos

6、ition of waterMorrow,UniversityofWyoming,foundthatvalenceofinorganiccationsintheinjectedwatercanaffactadsorbancecapacityofasphaltence,causingtheoil-wetatrocksurface.C.Effect of surface active substancewettability reversed phenomenonThe relation of preferential wetting and concentration of active material.D.Effect of roughness Relation of contact angle and shape angleE.Effect of water injection