Ali Mahmoodi PhD Defense

There are communities of a variety of microorganisms living in oil and gas reservoirs, hundreds of meters underground. An especially important type of these microorganisms are called Sulfate Reducing Bacteria (SRB), which consume sulfate and produce hydrogen sulfide (H2S). This process, referred to as reservoir souring, is an unfavorable process for us due to several reasons.

First, H2S is a highly corrosive gas and thus, when moved into the wells along with oil, it causes serious corrosion challenges.

Second, H2S is toxic, meaning it can create severe health problems for the crew if leaked out of the system.

Third, this gas also has negative impacts on the natural environment. If leaked into the groundwater or surface water, H2S changes the acidity of the water, altering the habitats of the animals or microorganisms.

For these reasons, there is a need to comprehend our understanding of SRB activities inside oil and gas reservoirs.   To fully understand and mitigate the processes resulting in the generation of H2S, we need to be able to simulate reservoir souring and study its impacts and mitigation at the reservoir scale.

In this project, we are integrating mathematical models at different parts of the system to be able to simulate multi-phase (oil/gas/water) fluid flow and reservoir souring inside the porous media combined with its impacts on the wells and flow lines in terms scale precipitation. Performing such a study not only benefits this field of industry and the natural environment, but also has notable uses in other fields. In groundwater studies, the ability to study microbial activities and chemical processes, together with fluid flow and transport of chemical components is vital.

Furthermore, in geothermal energy production, the effect of temperature alterations on the chemical processes, ecology of microorganisms, and the resulting well/flow line integrity and safety implications are of paramount importance, which can be done with such a simulator. We dream of a secure and safe path toward sustainability, which is reducing the environmental impacts of oil and gas operations as well as clearing the way for renewable alternatives.

You are welcome to attend the PhD defense in person or join it virtually on Zoom via this link