Experimental study of the hydroquinone (HQ)-hexamethylenetetramine (HMTA) gel system for conformance improvement in extremely high-temperature reservoirs

摘要

An organically crosslinked polymer with hydroquinone (HQ)-hexamethylenetetramine (HMTA) as crosslinker used for profile control was analyzed systematically at extremely high temperatures (over 150 degrees C). The optimal gelation time and gelation performance may be achieved by changing the polymer and crosslinking agent concentrations. The gelation time is decreased and the gelation performance is improved as the concentration of polymer and hydroquinone-HMTA increased. It still has a very dense microscopic three-dimensional network structure after 3 months of aging at 150 degrees C. The gel system can effectively improve the formation profile by plugging the high permeability layer and introducing subsequent water into the undisturbed layer.