低渗透油藏菱形反九点井网产量计算研究

针对低渗透油藏菱形反九点井网至今尚没有产油量计算公式的问题，依据低渗透油藏注水开发理 论，应用低速非达西渗流基本公式、流线积分法及单元分析法，推导出了低渗透油藏菱形反九点井网的产 量计算公式。菱形反九点井网产量计算方法比正方形反九点井网多了2 个单元流量计算公式，达到了 4 个，而且同样适用于正方形反九点井网。利用鄂尔多斯盆地某低渗透油藏BYS 区块的实际生产数据进 行计算，相对误差为8%。利用启动系数方法，评价了BYS 区块的菱形反九点井网的适应性，经过优化加 密调整，已初步取得了显著效果，验证了该方法的可靠性和实用性。

Oil production calculation for rhombic inverted nine-spot areal well pattern of low permeability reservoirs

Aiming at the problemthat there is no calculation formula about the yield of rhombic inverted nine-spot areal well pattern in lowpermeability reservoirs up to now,based on the water flooding theory of lowpermeability reservoirs,the yield formula for calculating the rhombic inverted nine-spot areal well pattern was deduced by using the basic formula of low rate non-Darcy flow,flow line integral method and element analysis method.The application range is wider than the square inverted nine-spot areal well pattern.The production rate of eight wells of low permeability reservoirs in the BYS block of Ordos Basin was calculated by the method.The result is close to the real yield,with a relative error of only 8%.Adaptability of the rhombic inverted nine-spot areal well pattern in BYS block was evaluated by using the startup coefficient.Aremarkable result has been obtained preliminarily by the optimization and adjustment in BYS block.