Chemical Flooding Well Pattern Design in QD Oilfield Transitional Zone

Influenced by the anticline, as the reservoir in QD oilfield transitional zone has been being developed from the axis of the anticline to both flanks and gradually into the aquifer, the adding thickness of the reservoir on the plane is gradually decreasing, with significant differences in different thickness development among different strips. Furthermore, there are many differences in well pattern design in different areas, and the production condition in existing old wells are complicated, which are all resulted in a low reserve of chemical flooding. In order to implement the exploitation potential of the chemical flooding and increase their reserves in transitional zone, by using the methods of researching the detailed geology in reservoir strata, modeling the data and comparing different plans, and by discussing from three aspects including the conclusion of the evolution of the new and old well patterns, the determination of reasonable injector-producer distance by the optimization of technical data, and the overall and optimized well pattern design for two zones, this paper has been making a research for setting reasonable injector-producer distance and well pattern design in transitional zone. The result of this research ultimately forms three goals as 3a to the chemical flooding in transitional zone, which are to form an exploitation understanding, to build a well pattern, and to achieve a top exploitation, therefore to provide theoretical and technical basis for highly efficient exploitation of chemical flooding in oilfield transitional zone.