低渗透油藏菱形反九点井网不等缝长优化研究
发布时间：2019-08-06 20:38
【摘要】：在低渗透油藏开发中广泛使用菱形反九点井网,但针对不同位置生产井及注水井的裂缝缝长配比关系还缺少广泛深入的研究。基于长庆油田某低渗透油藏参数,建立了数值模拟模型,在菱形反九点井网中分别设置不同的边井、角井和注水井裂缝穿透比,研究不同裂缝配置模式对水驱开发效果的影响。流线模拟及数值模拟计算结果表明,在注水开发中,注水井缝长是影响油田产液量及水驱效果的关键因素;边井裂缝较角井裂缝更易见水,对油田综合含水影响较大,在菱形反九点井网中需要进行不等缝长优化设计;边井裂缝缝长对水驱效果的影响分为早、中、晚期(Ⅰ、Ⅱ、Ⅲ)曲线段,随着注水井裂缝穿透比增加,早期(Ⅰ)曲线段增长,中期(Ⅱ)曲线段缩短,而晚期(Ⅲ)曲线段变化较小;随着角井裂缝穿透比增加,采出程度逐渐增大,当角井裂缝穿透比较大时,存在"反转"现象;随着注水井裂缝穿透比增加,角井裂缝优化穿透比减小,而边井裂缝优化穿透比增加。该研究成果对于指导低渗透油藏菱形反九点井网裂缝优化设计,提高波及系数和开发效果具有重要的指导意义。
[Abstract]:Rhomboid reverse nine-point well pattern is widely used in the development of low permeability reservoirs, but there is still a lack of extensive and in-depth research on the relationship between fracture length and fracture length of production wells and injection wells in different positions. Based on the parameters of a low permeability reservoir in Changqing Oilfield, a numerical simulation model is established. Different fracture penetration ratios of edge wells, angle wells and water injection wells are set up in the rhombic reverse nine point well pattern, and the effects of different fracture configuration modes on the development effect of water drive are studied. The results of streamline simulation and numerical simulation show that the fracture length of injection well is the key factor affecting the liquid production and water drive effect of oil field in water injection development, and the fracture of side well is more likely to see water than that of angle well, which has great influence on the comprehensive water cut of oil field, so it is necessary to optimize the unequal fracture length in rhomboid reverse nine point well pattern. The influence of fracture length on water drive effect is divided into early, middle and late (鈪，
本文编号：2523735
[Abstract]:Rhomboid reverse nine-point well pattern is widely used in the development of low permeability reservoirs, but there is still a lack of extensive and in-depth research on the relationship between fracture length and fracture length of production wells and injection wells in different positions. Based on the parameters of a low permeability reservoir in Changqing Oilfield, a numerical simulation model is established. Different fracture penetration ratios of edge wells, angle wells and water injection wells are set up in the rhombic reverse nine point well pattern, and the effects of different fracture configuration modes on the development effect of water drive are studied. The results of streamline simulation and numerical simulation show that the fracture length of injection well is the key factor affecting the liquid production and water drive effect of oil field in water injection development, and the fracture of side well is more likely to see water than that of angle well, which has great influence on the comprehensive water cut of oil field, so it is necessary to optimize the unequal fracture length in rhomboid reverse nine point well pattern. The influence of fracture length on water drive effect is divided into early, middle and late (鈪，
本文编号：2523735
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