Experimental Investigation of Steam Conformance Evolution in Vertical-CSS and Optimization of Profile Improvement Agents

Production performance of heavy oil deposits in Xinjiang oilfield developed by vertical-well cyclic steam stimulation (CSS) is increasingly challenged reservoir heterogeneity, which comprised original sedimental heterogeneity and steam-induced heterogeneity. In order to understand the impacts high-speed injection conformance, strategies maximize swept volume, a series experiments were designed implemented. Three-tube coreflooding performed study displacement dynamics under heterogeneous conditions, high-temperature plugging agent was developed. The indicate that conformance deteriorates once breakthrough occurs high-permeability tube, leaving medium low permeability tubes being surpassed. optimized could resist high temperatures over 260 °C its compressive strength 13.14 MPa, higher than maximal pressure. rate core greater 99.5% at 220–280 with pressure gradient 25 MPa/m. field test validated profile improvement feasibility oil, 217.6% previous cycle. this has significant potential for similar reservoirs.