低渗透油藏二氧化碳吞吐选井研究

Well selection of CO_2 huff and puff in low permeability reservoir

低渗透油藏注水开发效果差,采出程度低,而CO_2吞吐作为提高单井产油量的方法已得到广泛应用。因此,针对低渗透油藏二氧化碳吞吐施工井的选择方法展开研究,并将变权模糊层次分析法应用于低渗透二氧化碳吞吐井位选择,提高了在部分井缺少某些参数条件下选井的准确性。在考虑了油层厚度、剩余油饱和度、油井含水率、渗透率、孔隙度5种参数的条件下,确定了各参数在二氧化碳吞吐时的权重分配。在Eclipse中针对优选出的井位进行二氧化碳吞吐数值模拟,数值模拟结果显示,所选井进行二氧化碳吞吐增油效果良好,该方法可用于低渗透油藏二氧化碳吞吐选井。

The water injection development effect of the low permeability reservoir is poor degree recovery with low, while CO2 huff and puff technology is widely used as a method for improving the production of single well. Accordingly, the method of selecting wells for CO2 huff and puff in low permeability reservoir is studied along with the application of the variable weight fuzzy analytic hi- erarchy process. Therefore, the accuracy of well selection is improved without certain parameters. By the consideration of five pa- rameters which are the oil layer thickness, remaining oil saturation, water content, permeability and porosity, the weight distribution of every parameter is determined in CO2 huff and puff. The selected wells have been simulated in Eclipse for CO2 huff and puff, and the numerical simulation results show that the oil increasing effect is good. This method can be used for well selection of CO2 huff and puff in low permeability reservoir.