鄂尔多斯盆地大牛地气田老区合理井网井距研究

RATIONAL WELL PATTERN AND SPACING FOR DANIUDI GASFIELD,ORDOS BASIN

为了提高大牛地气田DK13井区采出程度和采收率,考虑该井区单井控制储量不均匀的特点,研究了该区的合理井网井距。分别用经济评价法、规定单井产量法、合理采气速度法、试井分析法、TOPAZE法、数值模拟法等七种方法进行论证,得出以经济极限井距为基础的技术合理井距,认为只要技术合理井距不低于其经济极限井距都是可行的。依据研究区沉积相及强非均质性特征,建议采用不规则井网,有利于有效控制储层及天然气富集区、提高砂体钻遇率,也便于气田开发后期进行调整。

For DK13 well area in Daniudi gasfield,the single-well controlled reserves are uneven.So,rational well pattern and spacing should be deployed in order to enhance the recovery.In this study,some methods including economic evaluation,setting single-well production,rational gas-producing rate,well-test analysis,TOPAZE,and numerical simulation were adopted separately to obtain the technically rational well spacing based on economic limit spacing.That the former is no less than the latter is feasible.In addition,according to the properties of sedimentary facies and strong heterogeneity of the study area,a suggestion on irregular well pattern was made to effectively control the reservoir and accumulation zone,and to improve the drilling rate.It is also convenient to adjust scheme at the later stage of development.