致密油藏长水平井衰竭式开发产量影响因素及效果评价方法——以玛18/玛131区块为例

针对致密油藏开发特点,选取地质和工程共7个要素,采用相关性分析和灰色关联方法,明确了水平井稳定生产3个月和2年后的产量影响程度.引入有效长度比、单位压降累积采油量、年产量综合递减率等指标,确定了能表征水平井天然能量开发效果的7个评价指标.采用层次分析和现代模糊综合评判法,初步明确开发分类评判标准,确定评价指标之间的权重关系,据此构建水平井衰竭式开发综合评价体系.矿场实践结果表明新评价体系结果合理.

Production Rate Influencing Factors and Evaluating Methods of Depleted Horizontal Wells in Tight Oil Reservoir : Taking Ma 18/Ma 131 as examples

According to the characteristics of tight oil reservoirs, 7 factors that include geological and engineering aspects are selected, and the influence degree of production rate after 3 months and 2 years are determined by correlation analysis and grey correlation method. The effective length ratio, cumulative oil production per unit pressure drop and comprehensive decline rate of annual production are introduced to determine 7 evaluation indexes that can characterize the depleted development effect of horizontal wells. Analytic hierarchy process and modern fuzzy comprehensive evaluation methods are applied to preliminarily define the classification and evaluation criteria of depleted development of horizontal wells. The weight relationship between evaluation indexes is determined, and a comprehensive evaluation system for depletion development of horizontal wells is constructed. Field practices show that the results of the new evaluation system are reasonable.