Abstract
Summary To overcome the inherent inferiors of pristine particle gel and in-situ polymer gels, such as the extrusion, dehydration, mechanical vulnerability and thereof defects, a new class of particle gels that can re-crosslink at subterranean conditions, wherein maintaining stable in supercritical CO2, is described in this work. The newly developed particle gel is called CO2 resistant re-crosslinked preformed particle gel (CO2-RPPG). After being placed into target zone, the particles accumulate in the fractures or conduits and then self-recrosslink into a rubber-like bulk gel, which can block the target zone or bypassing zone, and thereby divert the chased fluid (e.g., CO2 or water) to the unswept zone. Therefore, the CO2-RPPG can be used to plug the preferential fluid flow channels in CO2 injection reservoirs and thus improve CO2 sweep efficiency and storage efficiency. In this paper, we will provide a comprehensive evaluation for the novel particle gel to tell where if it can used for CO2 flooding and storage projects for better plugging efficiency. Results show the novel polymer particle gel provides a novel and cost-effective tool to control CO2 injection performance, improve sweep efficiency and storage efficiency for CO2 storage and EOR projects.
Published Version
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