Study On Generation Mechanism And Migration Mechanism In Microchannel Of Strengthened Dispersed Gel Three-phase Foam

Aiming atthe decrease of stabilized foam ability due to stability being poor of particles in high-temperature and high-salinityreservoir,a novel strength dispersed particle was prepared which used nanosilicon particles as strengthened material.SDPG three-phase foam system was constructed in laboratory and intensively studied foam generation mechanism and migration mechanism.The optimized nanosilicon particlesconcentration for preparing SDPG is 0.2wt%.SDPG is made up of 0.6wt% polyacrylamide+0.2wt% nanosilicon particles+0.6wt% phenolic resin crosslinking agent.Three-phase foam system was constructed in laboratory which formula is: 0.3wtSDS+0.1wt%SDPG.Entirely performance evaluating experiments of stability performance and application performance showed that the SDPG three-phase foam equipped more excellent temperature resistance and salinity resistance than DPG three-phase foam.What is more,SDPG can inhibite adsorption of surfactant on sand and reduce the loss of surfactant.In application performance,the plugging performance and selecting plugging performance of SDPG three-phase foam is superior to that of DPG three-phase foam.And the physical model experiments showed that the oil recovery value can be enhanced 12.5%.Simulating pore throat structure of reservoir using sudden shrinkage and enlargement structure in microchannel studied foam generation mechanism and migration mechanism.It showed that the size of bubbles hardly affected by solution viscosity.Bubble size decreases with the increase of liquid flow rate,increases with the increase of gas flow rate and presente power function relationship.Therefore,bubbles generation iscontrollable regulation.SDPG can accelerate breakup of bubbles and prevent coalescention between bubbles,which contribute on the stability of foam stability and maintain stability of foam.