Inderscience Publishers

Synthesis and application of a pH–triggered microgel in reservoir mobility–control

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The pH–triggered microgel (PTM) was synthesised with acrylic acid (AA) as monomer, triallyl pentaerythritol ether (TPE) as cross–linking agent, ethyl acetate and cyclohexane as solvent, and bis–(2–ethylhexyl) peroxydicarbonate (EHP) as initiator at 65°C. Structure of PTM was determined by infrared spectrometry (IR). The influences of temperature, concentration of electrolyte and degree of neutralisation on the viscosity of PTM were investigated. As a novel mobility–control agent, the product was evaluated in terms of percent permeability reduction (PPR) and flushing resistance. The results showed that PTM has the best comprehensive performance when EHP content was 0.3% and TPE content was 1% (by monomer weight). Under this condition, the viscosity of PTM could reach as high as 73,000 mPa.s, and the percent of permeability reduction is 97% in simulative carbonate reservoir. [Received: September 27, 2013; Accepted: July 2, 2014]

Keywords: pH–triggered microgel, PTM synthesis, viscosity, percent permeability reduction, PPR, mobility control agents, polymer gel, temperature, electrolyte concentration, neutralisation, flushing resistance, simulation, carbonate reservoirs

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