The Application Of Cross-linked Polymer Solution Deep Profile Control For Oil Displacement Technology In Bao1 Block

The cross-linked polymer solution is that the cross-linked polymer coil of thread hits the target in water dispersing system. Belongs to the dilute solution of high polymer, characteristic property having colloid and the solution. Its polymer thickness is low , viscosity is small ,having good injection, strong stability characteristics. The adsorption, retention, accumulation of the cross-linked polymer coil, makes it gives priority to being held up for in the t throat of the pore, forces into follow-up run quickly for low penetration area, which be beneficial to drive the crude oil running quickly for the agent from other location. Meanwhile, under a certain pressure, these cross-linked polymer coil that can move to at the head throats get along and continue coming into being putting up bridge sealing ,may make "the water channeling passage" taking form in the oil reserve from water drive "dynamic block " happened. Therefore, continuously produced from near and far sub-flow tapped, adjust, expand the displacement agent spread profile, twin drive oil to use in the lower mass fraction of the time, significantly change the interfacial properties of crude oil and rock, reducing crude oil / water interfacial tension, improve the displacement efficiency of liquid in the wash oil, enhanced oil recovery. With Reservoir of Bao 1 block for the package of a serious block heterogeneity, the characteristics of bad water injection, deep cross-linked polymer flooding technology and on-site sewage re-injection , microporous membrane sealed room blocking experiments and artificial core plugging, flooding experiment have been done. Experimental results show that the degree of recovery can be improved more than 13.6%. Based on laboratory studies, first implemented in the package a south-west of Bao 1 block in 2006, follow-up extended to package a northern. Field experimental results show that the cross-linked polymer system has good sealing characteristics, to achieve adjustment layer heterogeneity, the purpose of improving the water flooding.