Visualizing Conformance Control Mechanisms in High-Temperature Reservoirs: A Microfluidic Analysis of Pickering Emulsified Gel Systems

Abstract

In the context of mature oil fields, the management of conformance control and water shut-off stands out as a formidable challenge. Our prior research endeavors (Saikia et al., 2021, 2020) have introduced an innovative Pickering emulsified gel system tailored for the precise adjustment of relative permeability in high-temperature reservoirs. To optimize the efficiency of this system, a comprehensive comprehension of the underlying conformance control mechanism is deemed imperative. Traditionally, the exploration of conformance control mechanisms leans on empirical data culled from core flooding experiments, computerized tomography (CT) scans, nuclear magnetic resonance spectroscopy (NMR), and analogous methodologies. Nevertheless, these conventional avenues often fall short in delivering real-time visual analyses, thereby raising doubts about their reliability in predicting conformance mechanisms. In our research study, we have harnessed the capabilities of microfluidics to unlock real-time visual insights into the mechanisms governing conformance control. Employing two distinct glass micromodel geometries, we have conducted Pickering emulsified gel treatments at a scorching 105°C to achieve the targeted conformance control within these micromodels. By synergizing image and video analysis with injection pressure measurements, our findings have cast doubt on the previously posited Thin Film conformance control mechanism, revealing a more nuanced perspective on this intricate process.