潜山裂缝性油藏鱼骨井开发效果影响因素分析

鱼骨井是多分支井的一种。裂缝性油藏中鱼骨井能沟通更多裂缝,增加与油藏的接触面积,提高油藏的渗流能力。针对某一裂缝性油藏,筛选出影响鱼骨井开发效果的井身结构参数。利用正交试验设计方法设计了9个试验方案,根据试验方案建立相应的油藏数值模拟模型。基于初期产能、累产油等开发指标,采用直观分析方法,得出影响鱼骨井开发效果的各井型参数的重要程度和最优的参数组合。四个影响因素显著程度依次是主井筒长度、分支间距、分支长度、分支角度;并通过单因素敏感性分析方法验证了相应的正交试验设计结果的准确性。

The factor analysis of the fishbone well development effect in fractured buried hill reservoir

Fishbone well is a kind of multi-branch well. Fishbone well can drill more fractures in fractured reservoir,which can increase the contact area and the ability of reservoir seepage. Four wellbore structures parameters of fishbone well which impact the development effect were selected for certain fractured buried hill reservoir. By means of orthogonal experimental design method, nine pilot schemes were designed. Then corresponding reservoir models were built by applying reservoir numerical simulation method. Based on development indexes,such as early productivity and cumulative production, impact extent of each wellbore structures parameter and optimal parameter combination were figured out by applying visual analysis methods. The sorting of influence factors was length of main wellbore, branch spacing, length of branch, branch angel. Further, the accuracy of the orthogonal test results were testified by single-dimensional sensitivity analysis.