Study On Elastic Particle Profile Control And Water Shutoff System

In this paper,aimed at existing problems of plugging agent system which the most complex oilfields exists,such as high temperature steam recovery method of heavy oil wel,highpermeability formations with large channel and fractured reservoir.In the same time the elastic particles profile control and water shutoff system are studied.This article optimize a kind of elastic particles named DBR based on the common elastic materials and Optimum seeking a type of high temperatue molten material named SA and inquiry the optimum proportion beteen them,the volume of the material modulus is 140 ~ 160 MPa.Particle volume decreased 34.2%,and diameter reduced to 87% when external pressure under 12 MPa.Through the way that modification and optimization combination developed an elastic/melting type composite profile control and water plugging system which suitable for high temperature and large hole formation formation.Basic formula is 0.5% DBR + 0.05% AOS + 500mg/L HPAM and the elastic/molten particle plugging system formula is 0.6%DBR + 0.4%SA + 0.05%AOS + 500mg/L HPAM.Reserch shows that this system heat resistance more than 200?,salt tolerance more than 20000 mg/L,plugging big hole formation plugging rate is greater than 99.99%.The elastic/molten particle plugging system is suitable for the formation temperature more than 90 ?,plugging pressure is greater than 12 MPa.The last,injection parameters and slug combination of system has been optimized,the matching relationship of particle size and pore throat has been examinated.The effect mechanism of elastic particles plugging system is discussed,show that Elastic particles through migration-seal-deformation-migration process to realize sealing formation.Forming dense pack in the channel way,blocking the fluid flow in the porous media,and change the stream-line,so as to realize adjustment of the whole reservoir water absorption profile and enhance the efficiency of the water flooding.