Research On Core Property Detection And Micro Residual Oil After Strong Alkali Asp Flooding

This area is located in the central Xing2area of Xing bei oil fields. This area did waterinjection during1998to2000and strong alkali asp flooding during2000to2009. Thewettability of reservoir rock turn close water to neutral wetting changes due to the complexsystem of alkali after alkali asp flooding. At the same time the microscopic reservoir porestructure will also be changing, It so also determines the asp flooding the type of remainingoil after micro, existing way and distribution form. This article determine the residual oilformation in the light and heavy oil of the quantity quality and weight than oil componentsthrough the confocal laser fluorescence detection, study of the existence of the remaining oilmicro type, number, application of magnetic resonance imaging and confocal laser technologymeans,combined with micro flooding and physical model for analysis of remaining oil microreasons. At the same time we contrast alkali asp flooding core physical properties changebefore and after. At last,we research the main reservoir of remaining oil distribution of eachlayer by use of numerical simulation technology combined with the new drilling and coringwell logging data.We conclusion that light component is0.5835times heavier than heavy component afterthe water flooding, after the asp flooding it was0.7232,0.8485times. Reservoir numericalsimulation results show that petroleum reservoir appear widespread flooding, the remainingoil saturation is small, and distributed in reservoir permeability of the lower local area, therule was not unified. Asp flooding recovery degree is higher, to more than60%, with theremaining oil formation in a major adsorption in the remaining oil bound states of mineralsurface is given priority to, but there are still part of the half bound states and free state of theremaining oil. To further improve the recovery,the main way to expand and improve thesweep volume of oil washing efficiency is given priority, such as high viscosity viscoelasticpolymer solution as oil displacement system or to use fracturing acidizing technique and soon.