Abstract
L oilfield is a layered sandstone gas cap oilfield controlled by structure. The gas is on the top of the structure. On the plane, the oil and gas are distributed in a ring belt, and the area of gas cap from top to bottom is gradually smaller. In the early stage of development, in order to maintain the stability of oil-gas interface and prevent oil and gas channeling, a certain width of unperforated oil ring is left outside the gas cap as a buffer zone for oil and gas migration. At present, the whole oilfield has entered the stage of ultra-high water cut development. In order to effectively develop the reserves in buffer zone and explore the reasonable development mode of the gas cap reservoir, reservoir structure, development characteristics, migration law of oil and gas in buffer zone and distribution characteristics of remaining oil potential were fully considered, and the development effects of different flooding methods such as water injection barriers, polymer injection barriers, gas flooding, water flooding, were comprehensively compared. The development mode of polymer injection barrier is optimized through comprehensive comparison. It is estimated that the recovery ratio will be increased by more than 20% points, which can provide important technical reserves for the effective development of layered gas cap reservoirs in ultra-high water cut stage.KeywordsGas cap reservoirBuffer zonePolymer injection barrierWell pattern deployment
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