POTENTIAL UTILIZATION FOR A ROCK-BASED GEOPOLYMER IN OIL WELL CEMENTING

摘要

In this work, we have studied rheological behavior and mechanical properties of selected modified rock-based geopolymer, which are suggested for zonal isolation and permanent abandonment of hydrocarbon wells. Our rheological measurements of the geopolymeric slurries shows a very small Yield Stress and a constant plastic viscosity. Even though the yield stress is small, a non-Newtonian flow behavior is distinguished. Mechanical vibration measurements showed that vibrations have surprisingly little effect on the shear stress changes. Consistency of the geopolymeric slurry was measured by utilization of atmospheric and pressurized consistometers to find the impact of pressure and temperature on pumpability. A temperature decrease of 10°C postponed the geopolymerization by 4 hours and a temperature increase by 10°C accelerated the geopolymerization by 30 minutes. Static-fluid-loss test showed only 1.6 (ml) of fluid loss after 30 minutes which is another advantage of the geopolymeric slurry. The elastic shear wave and compressional wave velocities and velocity anisotropics of the samples were tried to be determined experimentally. However, our efforts showed that geopolymeric structure of the samples requires different frequencies as it damps the high frequency signal.