Preformed-Particle-Gel Transport through Heterogeneous Void-Space Conduits
Preformed particle gels (PPGs) have been successfully applied as a plugging agent to solve the conformance problem in fractured reservoirs. They are injected to plug fractures and then divert displacing fluid into poorly swept zones/areas. However, PPG-propagation and-plugging mechanisms through open void-space conduits (VSCs) have not been studied thoroughly. This paper investigated various situations involving heterogeneous conduits and their geometrical effect on PPG injectivity. Five-foot tubes were used to mimic VSCs. Three models were designed to gain understanding on how conduit geometry and PPG properties affect gel transportation, including a single conduit with a uniform internal diameter (ID); a single conduit with a nonuniform ID along its length; and two parallel conduits with different ID ratios with respect to each other. Results obtained from single-conduit models with uniform and nonuniform diameters showed PPGinjection pressure increased significantly as the conduit became more heterogeneous. Particle gels accumulated at the choke point within each conduit and caused injection pressure to increase accordingly. When two parallel conduits are available for flow, the relative distance of PPG penetration into the conduits depends strongly on the ratio of the conduit diameters and the gel strength. In addition, the ratio of gel-particle-size diameter to conduit diameter contributes significantly to the gel-transport selection. This paper demonstrates important impact elements of gel propagation for different heterogeneous-conduit situations.
A. Imqam et al., "Preformed-Particle-Gel Transport through Heterogeneous Void-Space Conduits," SPE Journal, vol. 22, no. 5, pp. 1437-1447, Society of Petroleum Engineers (SPE), Oct 2017.
Geosciences and Geological and Petroleum Engineering
Keywords and Phrases
Particle size, Conduit diameter; Fractured reservoir; Gel strengths; Geometrical effect; Injection pressures; Internal diameters; Plugging agent; Relative distances, Gels
International Standard Serial Number (ISSN)
Article - Journal
© 2017 Society of Petroleum Engineers, All rights reserved.
01 Oct 2017