The Changes Of Petrophysical Properties And Remaining Oil Distribution Regularities After Using Concentrated Alkali ASP Flooding In P Ⅰ Reservoir Of Xingshugang Oilfield

Xingshugang oil field is the earliest field test and industrialization promotion areadeveloping alkali ASP flooding in Daqing. Howere, the understanding for reservoirproduetion degree, remaining oil distribution, the changes of reservoir physical propertiesand reservoir scaling situation after alkali ASP flooding is not enough in-depth. Need tosystematically evaluate remaining oil distribution and the changes of reservoir physicalproperties of major reservoir group (PI) after alkali ASP flooding.New and old wells log information is applied in the paper. Through river formation high resolutionfine contrast, compound sand body anatomy, fine analysis of plane microfacies and fine point bar sandbody modeling, realize the recognition of fine system layer and single sand body, accurately and finlyreveal plane microfacies, single sand body distribution and point inside the dam structure. Based on theanalysis of dynamic and static data, by appling new drilled wells data and coring data before and afteralkali ASP flooding more clearly know the reservoir produetion degree and displacementeffect.Microscopic remaining oil distribution characteristics and causes are studied by using laserconfocal technology after alkali ASP flooding. Laser confocal results show that due to the dissolutionaction of alkali on stratum rock mineral, its wettability changes. And produce intergranular adsorbentremaining oil not existing in water driving. Using electron microscope scanning and electronic probetechnology, observe core physical property changes before and after alkali ASP flooding. Cored wellsbefore and after alkali ASP flooding show that reservoir physical properties become worse. Claymineral increases. Pore structure happens corresponding changes. And the wettability of the rock shiftsfrom hydrophilic to neutral. At the same time, the core tests show the presence of silica scaling.The study can deepen the study of the formation mechanism of remaining oil, furtherdeepen the understanding of the ASP flooding mechanism, and fill blank reservoir propertychanges research after alkali ASP flooding including porosity, permeability, fluid, rockwettability at home and abroad. It can further optimize ASP flooding industrializationpromotion scheme design, provide theory basis for exploiting remaining oil after ASPflooding, quicken the development of further improving oil recovery technology, andprovide technical reserves for tertiary oil recovery in Daqing oilfield.