This article describes the results of ultrasonic triaxial tests performed at high temperature to simulate the impact of SAGD (Steam Assisted Gravity Drainage) project on the rock properties of a heavy oil reservoir in Venezuela. The tests were performed using unconsolidated sandstone samples at high temperatures. The purpose of these tests was to evaluate the impact of temperature on the compressional velocity in order to predict rock strength from logs during SAGD operations. These analyses are crucial to evaluate the impact of high temperature on UCS, Poisson's Ratio, Young's Modulus and Internal Frictional Angle. The results are indicating a reduction of compressional velocity of about 20% at 1500C. The article describes the results and discusses the used methodology.

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