Matchability of Dispersive Drive Systems Within Porous Media in High Temperature and High Salt Reservoirs
Complexity of reservoir conditions and the level of pressure can only macroscopically indicate the difficulty of injectivity,and microscopically it is difficult to demonstrate the matching relationship between the pharmaceutical system and reservoir permeability.In order to meet the needs of deep fluid steering technology in oilfield,taking WZ low porosity and low permeability reservoir as the simulation object,the microscopic aggregation state,swelling property and compression deformation ability of the dispersed conditioning system designed for four different components were studied;and the matching relationship between the microspheres and the pore throats of the artificial rock cores was examined.The results showed that,A and B had low swelling characteristics,mainly relying on stratum adsorption to produce blockage;C and D contained more hydrophilic functional groups,and effective osmotic pressure difference could be formed inside and outside the microspheres,and the particle size of both of them swelled by about 7 times,which had a good hydration and swelling effect;the average value of Young's modulus for C was 1.5 GPa,which was prone to deformation in low porosity and low seepage,and easy to pass through the pore throats of reservoir,while that of D was 4.5 GPa,which was suitable for medium and high permeability for the conditioning/blocking application.Finally,the lower limit of permeability when the particles of the conditioning and driving system can reach the initial transport within the core was determined.
Dissolution propertiesModulus of elasticityMatching relationshipLower limit of permeability
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