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异常高压特低渗透油藏多采用人工压裂开采,以获得较高的产能。此类油藏一般注水困难,多依靠较充足的天然能量开发,开发过程中油井产能受地层能量衰减、压敏效应、启动压力以及压裂裂缝导流能力衰减等因素的影响。在充分考虑其影响因素的基础上,以稳态渗流为基础,建立了产量递减规律的半解析方法和流固耦合渗流数学模型,实现了利用数值模拟方法来预测异常高压特低渗透油藏产量递减规律。应用这2种方法对博兴洼陷高89区块的12口井产量递减规律进行拟合和预测,根据预测的产量递减规律,优化出井底压力保持在13MPa时,累积产油量最高。
Abnormal high pressure ultra-low permeability reservoirs more artificial fracturing mining, in order to obtain higher productivity. Such reservoirs generally have difficulty in waterflooding, and rely more on natural energy development. Well productivity during the development process is affected by such factors as formation energy attenuation, pressure-sensitive effect, starting pressure and attenuation of fracturing fissure conductivity. Based on the steady-state seepage, the semi-analytical method and the fluid-structure coupled seepage mathematical model are established on the basis of steady-state seepage, and the numerical simulation method is used to predict the yield of the abnormally high pressure and ultra-low permeability reservoir Decreasing rule. Applying these two methods to fit and predict the decreasing regularity of 12 wells in Block 89 of Block Baxing Depression, according to the predicted law of decreasing production, the optimized method is that when the bottom hole pressure is kept at 13MPa, the cumulative oil production is the highest.