| Abstract |
Characterization of short and long term mechanical properties is the key to understand cement behavior in different scenarios. Generally, room temperature is used for reference while elevated temperature to simulate downhole conditions. The understanding of the cement mechanical properties such as Uniaxial Compressive Stress (UCS) will guarantee the correct selection of the cement that will meet the requirements for each specific well. The cement characteristics of the selected cement type can be improved by additives to match the requirements for each well in terms of density, strength, curing time and so on, in this paper the effect of micro cellulose will be investigated and described. Micro-cellulose has been reported as a great additive in geothermal well fluid loss curing solutions. Given the recent success of using Micro-Cellulose in curing loss circulation, addition of some amount to the cement slurry could inevitably be an option for cement fluid loss cure. However, the Micro-Cellulose can change the hydration process on the cement due to its natural characteristics, decreasing the compressive strength of the cement at the early stages; this phenomenon will be further described in the paper The samples were prepared following current API RP 10B Recommended Practice for Testing Well Cement, also a correlation between UCS and Ultrasonic Pulse Velocity (UPV) was developed in order to achieve a better understanding on mechanical properties. Samples were cured at 1, 3, 7, 14 ,21 and 28 days at room temperature, additionally, samples with the same curing time were cured using baths with controlled high temperature of 75 C, then tested and plotted to generate a comprehensive understanding of its behavior. |