Kinetic Models of Integrated Solidification and Cementation of Cementformation Interface with New Method

摘要

The isolation failure of cement-formation interface is an important and urgent problem in oil production, whilean effective way to solve it is to realize the integrated solidification and cementation of cement-formation interface (ISCCFI).In order to study the kinetics of ISCCFI with MTA (Mud Cake to Agglomerated Cake) method, the Diamond DifferentialScanning Calorimetry Analyzer is adopted for experiments with dynamic method and isothermal method. The results show that there is a linear relationship between the solidification reaction temperature and the heating rate of ISCCFIwith MTA method. For the first exothermic peak, the initial temperature, peak tip temperature and final temperature are 53 °C, 69 °C and 83 °C respectively, and the apparent activation energy of solidification reaction is44.39×10-3 kJ·mol-1, the natural logarithm of preexponential factor is 7.26, the solidification reaction order is 0.88. For the second exothermic peak, the initial temperature, peak tip temperature and final temperature are 83 °C, 92 °C and114 °C respectively, and the apparent activation energy of solidification reaction is 99.14×10-3 kJ·mol-1, the natural logarithm of preexponential factor is 24.77, the solidification reaction order is 0.94. The maximum solidification reactionrates at 50 °C, 75 °C and 90 °C are 0.09×10-3 s-1, 0.27×10-3 s-1 and 0.51×10-3 s-1 respectively. The kinetic models of ISCCFI with MTA method under different temperatures are established. It provides a theoretical and technical support forthe isolation improvement of cement-formation interface.