Research On Evaluation Method Of JiYuan Oilfield Long8Reservoir

The natural elastic energy of low permeability reservoir is generally small, typicallyby using the development method of water injection to maintain reservoir pressure.Therefore, there are a lot of people focuses on the water-driving effect evaluation on lowpermeability oilfield, and the water-driving effect evaluation is very important for thedynamic effects assessment. Reasonable evaluation of low permeability oil field’swater-driving effect is very beneficial to improve reservoir water flood development. Andit is also significant to improve the ultimate recovery of the reservoir.According to the flow characteristics of low permeability reservoir, this thesisstudies on the moisture content of water-drive reservoirs, recovery extent and recoveryrate and the mutual relationship between them. This thesis evaluates on water injectiondevelopment dynamic of low permeability reservoir, water-driving effect as well as theindex of the adaptability of well network. Combine with the domestic and foreignexperts’ experiences and methods on effect evaluation of water-flooding reservoirdevelopment, we evaluate the effect of water injection in Jiyuan oilfield Chang8reservoir, including the water drive curve, the rate of water storage, water floodingindex and so on.In the situation of actual development analysis of Jiyuan oilfield Chang8reservoir, this thesis firstly evaluate on production decline, water drive characteristic,water content, recovery degree and recovery rate, the underground water storage rate andwater-driving index in this block. And then evaluate the development wells in blocknetwork. Finally, by using the theory of fuzzy optimization to all of the indexes to makea comprehensive evaluation, and get an evaluation results in every relative block.