The objectives of this project are to identify the mechanisms by which gel treatments divert fluids in reservoirs and to establish where and how gel treatments are best applied. Several types of gelants were examined, including polymer-based gelants, a monomer-based gelant, and a colloidal silica gelant. This research is directed at gel applications in water injection wells, in production wells, and in high-pressure gas floods. The work will examine how the flow properties of gels and gelling agents are influenced by permeability, lithology, and wettability. Other goals include determining the proper placement of gel ants, the stability of in-place gels, and the types of gels required for the various oil recovery processes and for different scales of reservoir heterogeneity.