Optimization Method Study For Compositive Adjusting Measures In Oil Field During High Water-cut Stage

Interbedded and planar conflict has got badly after high water-cut stage reached in Daqing oil field. How to control water cut, extend swept volume of water injection and enhance oil displacement efficiency is a problem in dire need of settle at this time. Daqing oil field adopt the layered injection allocation method that mainly depend on the experience of missionary. The workload of this method is great, and the adjusting effect depend on the experience of missionary, influenced by anthropic factor greatly. Therefore, layered injection allocation method was studied in this article based on the study of regularities of distribution of remaining oil. Method that optimize fracture, profile modification, reperforate, layered injection allocation project is studied using theory of fuzzy mathematics, then we can optimize measures project using dynamic data and static state data. The optimization need data of remaining oil and pressure. Therefore, the simplified two-dimensional and two phase numerical simulation method established in this article united research findings of subtle geologic model, and it can forecast dynamic target like pressure and saturation truly and rapidly. The method ignored infrequent gas phase and vertical permeability in reservoir, saved computing time greatly and enhanced operational speed greatly, and it realized the unite with subtle geologic model at the same time. Software was developed based on the research findings above and was used in NAN LIU QU XI. Remaining oil was analyzed in 97 sedimentation unit, 163 well, project was calculated and optimized in 60 water well on the basis of analysis of remaining oil. The result is very good.