油田经济极限井网密度计算新方法

经济合理的井网密度对提高油藏波及系数和最终采收率至关重要,是油田调整开发方案的依据.针对谢尔卡乔夫公式计算井网密度的结果与生产实际不符的问题,从理论及方法上对经济井网密度进行了系统阐述,明确了目前常用井网密度的内涵和外延,重新界定了经济极限井网密度的定义,在此基础上对谢尔卡乔夫公式进行了修正完善,建立了新的适合于中国石化不同油区和不同类型油藏计算经济极限井网密度的经验公式.根据各区不同类型油藏实际的储量丰度和油藏流度统计数据,结合修正的谢尔卡乔夫公式对中国石化5个主力油区及各油区的中高渗透、低渗透和稠油3种不同类型油藏的经济极限井网密度进行了计算.结果表明,东部5个主力油区和不同类型油藏在油价为80美元/bbl时可钻加密井分别为20 515和19 366口.

A new method of economic limit well pattern density calculation in oilfields

The economic and reasonable well pattern density is the key point to enhance the reservoir conformance factor and ultimate recovery factor, and the oilfield development adjustment is also based on it. In view of the problem that the result of well pattern density made by Cher card Geoff formula cannot be suitable for the actual situation of production, we formulate the economic well pattern density from the theory and practical method so as to clarify and definite the connotation and extension of current common well pattern density, and define the conception of economic well pattern density. Based on the improvement of Cher card Geoff formula, we found the empirical formula, that calculates the economic limit well pattern density, can be suitable for various different kinds of oil blocks and reservoir in Sinopec. According to the statistical data of practical reserves abundance and fluidity in different type reservoir, we combine the state with the rectified Cher card Geoff formula, and use this formula to calculate the economic limit well pattern density of different type reservoir in five primary oil blocks, which include the high permeability reservoir, low permeability reservoir, and heavy oil reservoir. The result of calculation shows that we can drill the infilling well in the number of 20 515 and 19 466 in eastern main oil block and different types reservoir, when the price of oil can maintain at 80 $/bar.