University of Texas System

Harcros Chemicals, Inc.

Krishna Panthi

Kishore K Mohanty

Upali Peter Weerasooriya

Robin Singh

John Boorem

Aaron Boorem

Pinaki Ghosh

Kevin Sikkema

Kurt Cheshire

Bochao Zhao

Peter Radford

Himanshu Sharma

The present invention is directed to surfactants with small hydrophobes, which are of non-conventional hydrophobe size. The surfactants of the present invention utilize a small hydrophobic moiety with a polyalkoxylate chain comprising PO, BO and/or EO groups, with optional ionic groups, such as anionic, cationic and zwitterionic, to achieve the desired hydrophilic-lipophilic balance (HLB). The present invention is further directed to formulations comprising the surfactants of the invention, and methods of using the surfactants of the invention, including in enhanced oil recovery applications.

Surfactants having non-conventional hydrophobes

Tracer eluting proppants, such as proppants that have polymeric coatings on them that include tracers, such as a fluorescent dye. The tracer eluting proppants can comprise proppant particles coated with a polymeric coating that can elute tracer under some, but not all conditions. For example, the tracer can be eluted at elevated temperature, pH, and/or salinity conditions, but not elute at lower temperature, pH, and/or salinity conditions. Methods of making and using tracer eluting proppants are also disclosed, including methods for characterizing subterranean reservoirs.

Tracer eluting proppants for hydraulic fracturing

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Cedar Park, TX, United States of America

Krishna Panthi