块状潜山稠油油藏水平井合理产能确定方法

为了确定块状潜山裂缝性稠油油藏水平井底部注水水平采油井的合理产能,利用镜像反映原理和势函数叠加原理推导出水平井井网底部注水整体开发厚层裂缝性稠油油藏的产量公式;并结合油藏区块实际地质参数,针对注采井距、注采压差、采油井垂向位置等影响产量的主要因素进行了分析和优化。结果表明,利用水平井井网底部注水整体开发厚层裂缝性稠油油藏的合理注采井距为2倍油层厚度。为了油井能够获得较高的产能,注采井之间首先必须保持合理的井距形成有效的驱替。随着注采压差的增大,生产井产量呈现线性增加的趋势;但存在合理的注采压差。纵向上将采油井布置在油藏的顶部,可获得最大的单井产量。研究成果可为块状厚层潜山稠油油藏单井合理产能的确定提供理论依据,且方便实用。

Method of determination reasonable productivity of horizontal well at blocky buried hill heavy oil reservoir

For determining reasonable productivity of horizontal well at blocky buried hill fractured heavy oil reservoir, who used horizontal well injecting water at the bottom and horizontal well producting oil at the top. Applying the method of image and superimposed criterion of potentia1 function to derive the productivity formula of horizonta1 wel1 patter in thick layer fractured heavy oil reservoir, at the same moment, optimizing and analyzing the main factors that effect horizontal well production with actual geological parameters of the reservoir block, which include well spacing, injection-production pressure difference and vertical location of production. The results show that the reasonable well spacing is double height of oil reservoir, for higher productivity, injecting well and producting well must firstly maintain reasonble well spacing to form effective displacement, with the increasing of injection-production pressure difference, production curve appears linear trend, but there is a reasonable injection-production pressure difference, production wells arrange as far as possible at the top in the reservoir, it will achieve maximum oil production.Achievements can provide theoretical basis for determining reasonable productivity of horizontal well at blocky buried hill fractured heavy oil reservoir, and it is very convenient and practical.