COMPOSITE SECTION PLUG PROFILE CONTROL TECHNOLOGY IN FUYU OILFIELD

The composite section plug profile control technology is developed based on the reservoir characteristics of fracture and throat development in Fuyu Oilfield.Based on the development of high strength,fast gelling plugging agent,two sets of profile control systems were developed,i.e.,swelling agent+sodium polymer+HJ-Ⅲ profile control system and gel granular+chromium gel+inorganic high strength plugging agent system.Both the two systems exhibit high strength,distortion resistance,flush resistance and low cost.Multi-section plug injection technique was adopted for profile control,and the section plug is composed of front edge plug,packing plug and sealing plug.In addition,the operation parameters optimization is further quantitatively scaled,and the profile control radius use the fitting result of tracer for reference,the settling speed of the granular agent is taken into considerations for operating flow rate.This technology has been used in 52 wells in Fuyu Oilfield,and to the end of December 2002,a total of 5023.8 tons of oil has been stimulated.