Research On The Effect Of Recovery Of Strong Alkali Ternary Compound Flooding In Sazhong Class ? Oil Layer

Now most oilfields of our country enter the stages of a high water cut.With the decrease of recoverable reserves of main reservoir,Both of economic indicators and technical indicators will get worse.The output of main reservoir is decreasing year by year.the development efforts of class ? oil layer are strengthen to ensure the sustainable development of oil field.Therefore,the research of strong base ASP flooding on recovery factor has a guiding significance for further development of oilfield.In this paper,the study of the reactions between strong alkali ternary compound systems and the rock is conducted by the static immersing test and the conventional mercury injection experiment;the influence factor of the molecular coil dimension and the molecular form of the systems is studied by Laser Scattering Method and scanning electronic microscopy;the system's injectability is studied by the flooding experiment;the mechanism of strong base ASP system start and transport process of residual oil is reached by microscopic visualization flooding systems;through the two parallel tube experiments the effects of subslug's concentration on the oil displacement efficiency is studied and the research of the oil displacement efficiency in different permeability contrast is conducted.The results show that the strong base ASP system's dissolution to the rock became stronger as the concentration of alkali went higher;the Molecular Weight's increase as well as the decrease of the alkali concentration lead to the increase of the molecular coil dimension;Shearing action will weaken the winding effect between polymer molecules and destroy the space mesh structure;the strong alkali ternary compound systems start the residual oil by its ability to reduce the interfacial tension,and due to the system's emulsifying ability,the residual oil is transported as oil threadiness or oil film;In the experiment of two parallel pore,chemical flooding recovery will be lager with the appropriate reduce of subslug's viscosity;with the increase of the permeability contrast,chemical flooding recovery becomes worse.