Hydro-Mechanic Behavior of Synthetic Carbonate Rocks Subjected to Injection of a Reactive Fluid

The main motivation of this research was the development of experimental studies to evaluate the changes in stress and strain of a synthetic carbonatic rock, using a modified ooedometric cell. There for, in this research it is presented laboratorial tests carried out with a cemented carbonatic rock artificially produced. Laboratory tests was performed in four stages: (1) sample collection and preparation, (2) physical characterization, (3) mechanical characterization of synthetic samples and (4) dissolution tests in the oedometric cell. From the dissolution testsresults, it was observed that the horizontal stress increases linearly as the plastic strain evolve, with a total volumetric strain of approximately 11.51%, its mechanical strength decreased by 33% and its porosity increased by 53%, which could cause the chemically induced compaction of the reservoir when submitted to the injection of fluids. This study is of great relevance for engineering, since the conditions under which the rock is being submitted reflect processes of acidification of the reservoir by geological storage of CO₂, advanced recovery of oil or gas, etc., which have negative consequences in the material.