关键词: 油田开发, 调剖, 黄原胶-铬凝胶体系, 反应速率常数, 活化能, 稳定性

Abstract: In order to determine the feasibility of a gel system under certain conditions of reservoir,the syneresis behavior that is an important factor affecting the long-term stability of gel in reservoir were studied.It is indicated that the syneresis of xanthan-chromium(III) gel system can be described by means of first-order reaction.The reaction rate constant increases while increasing temperature and the concentration of initial cross-linking agent.The calculation with Arrhenius equation shows that the activation energy is about 144.2 kJ/mol.The salinity has no effect on the syneresis of xanthan-chromium(III) gel system.An evaluation method for sysneresis rate of gel is presented.The syneresis of gel at any temperature can be predicted by means of the activation energy of syneresis reaction.Syneresis of gel under certain conditions is the inherent behavior of gel.Slight syneresis has no effect on the application of gel in the porous media.The prediction results of syneresis are given when the volumes of gel reach 50%,20% and 10% of its original volume.

Key words: oilfield development, profile control, xanthan-chromium gel system, reaction rate constant, activation energy, stability