چكيده به لاتين
Abstract:
Water injection is one of the common methods in enhance oil recovery of petroleum reservoir. It is possible injected water directly transferred into production well because of heterogeneity in reservoir structure. Use of gel polymers is one of the useful methods for prevention of water lost in petroleum reservoir. Hence, study of these gels properties is so important and amount of swelling in reservoir condition is a noticeable property for evaluation of gels performance. In this study different kind of gel polymer was produced and amount of swelling was measured. For this purpose, at first gel polymer was produced with different amount of crosslinker. Mono acrylamide and N,N′-Methylenebis(acrylamide) is main component in producing this gel. Free radical polymerization was used in construction of this gel. Equilibrium time is measured for measurement of swelling in equilibrium condition. Results showed, after 24 hour, water and gel polymer reach to equilibrium state. Then amount of swelling of gel polymers was measured in atmospheric pressure and different temperature. Result showed, when ratio of crosslinker to monomer is fix, with increasing temperature the amount of swelling decreases. Doing experiment in higher pressure is more complicated and there is few data in higher pressure. Main purpose of these study was measurement of swelling amount. For measurement of swelling amount in higher pressure an experimental setup is used. Experimental results showed amount of swelling decreases with increasing pressure. Gel polymers have ability of volume change more than 500 times because of elasticity property. For modeling of swelling equality of chemical potential was used. Because of elasticity property in gels, all former model have at least two term: elasticity and mixing. In this study for modeling gel phase, modified Flory–Huggins equation is used. To consider effect of pressure in calculations, chemical potential of solvent phase is calculated with Peng-Robinson fugacity coefficient. Error of the used model in this study in the atmospheric pressure and higher pressure is approximately 3.06 and 5.76 percent, respectively.
Keyword: gel polymer, swelling, elasticity, equilibrium time, free radical polymerization, high pressure
