ABSTRACT:

The knowledge of creep is crucial in predicting different phenomena such as reservoir subsidence associated with production, wellbore stability and proppant embedment. In this report, we explored the ability of nanoindentation technique to evaluate the pore scale interactions between the microporous solid and pore fluid. The specimens included a natural carbonate and an analog synthetic micro-porous alumina ceramic. The homogeneity and uniform pore size (mean=8.1 nm) of the ceramic was very helpful to isolate the fluid effects. We measured the creep deformation of the porous specimens over a period of 3 minutes under a constant maximum force using a nano-DMA transducer. The experiments were performed on dry samples as well as saturated with water (1 cp and buffered with 30 ppm calcite powder) and silicone oil (100 cp). Thus, the fluids presented a wide variation in viscosity and chemical reactivity.

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