Tese e Dissertação

Tese: Non-Newtonian flow displacement in well operations

Several oil industry operations, such as well plugging and abandonment, cementing operations, and restarting flows of gelled pipes, use the displacement of one fluid by another in annular tubes. There are many variables that can affect the displacement efficiency, namely the rheological behavior of the fluids, the viscosity and density ratios, and the well geometry. The interaction of these parameters can lead to instabilities at the interface between fluids that will result in inefficient flow displacement processes. In these circumstances, an effective procedure is required to prevent issues that could result in dangers and significant financial losses. In this work we present experimental results of the displacement efficiency through an annular tube. The analysis is done for low Reynolds numbers, with a Newtonian (water) fluid being displaced by a non-Newtonian (xanthan gum solution) one, to simulate a plug & abandonment operation. The experimental study is done using a test rig that consist of a steel tubing and a transparent casing with diameters that reflect a real-case scenario. We use two different inclinations and analyze concentric and eccentric situations. To determine the impact of the parameters on the displacement efficiency, a flow visualization is carried out at the experimental rig along with an evaluation of the interface instability.

Link da defesa

https://puc-rio.zoom.us/j/93741594778?pwd=Rbwz62eU0FcEkep4Ll3ak9dfAbZrvb.1

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