Study On The Adjustment Methods Of Water Flooding Well Pattern Of The Class Ⅱ Reservior In Polymer Injection Blocks

Aiming at the interference problem of water flooding and polymer flooding in polymer injection process carried out gradually in the classâ…¡(secondary) reservoir in Sazhong developing zone , a standpoint that water flooding development should not affect the effect of polymer flooding development is put forwarded, at the same time the development effect of the bed series itself is also taken into account, and further research focusing on the problem is proceed.First, the feasibility of polymer injection in the secondary reservoir of the blocks was studied in this paper. Based on the general investigation of the block geologic conditions, the geological reserves, the reserves abundance were calculated quantitatively, and the geologic structure was described. This paper analyzed the properties of the reservoir and fluid of different oil layers quantitatively, and experiments on the formation sensitivity were carried through. Development history and present situation of each block were summarized, the sedimentary characteristics of 50 sedimentary unit were described qualitatively, sedimentation types were classified. Through drawing section connecting diagram and permeability chorisogram, reservoir heterogeneous was analyzed, average permeability and coefficient of variation were calculated quantitatively; According to sedimentary microfacies, effective thickness ,permeability, and so on, the layers were divided into classâ… (primary),classâ…¡(secondary),classâ…¢(poor) layers. The distribution characteristics of remaining oil of the blocks were studied, the relationship of Water drive control level and well spacing density, producing ratio and watered out behavior of different layers were analyzed quantitatively.This paper mainly studied the adjustment method of water flooding well pattern in the secondary reservoirs of polymer injection area. According to productive characteristics of two previous polymer injection blocks that their water flooding well patterns were adjusted, the problems such as injection-production perfect degree decreased after adjustment, development effect went bad, formation pressure declined and so on, are analyzed. In view of the above problems, begun with optimizing plugging method in the first place, then recovery course after plugging was analyzed and tracked in time, the various kinds of factors that affected working degree of layers were studied, comprehensive adjustment of oil and water wells were regulated reasonably. A set of new methods and point of views were summarized, water-flood development effect in plugging region were improved effectively and it will be helpful for development adjustment of similar water flooding areas which are injected polymer.