摘要
将煤层气储层分为Ⅰ类、Ⅱ类及Ⅲ类,不同类型适合于不同钻井方案,沁水盆地煤储层属于Ⅱ-Ⅲ类,适用于3分支以上的简单水平井及羽状水平井;进一步数模结果表明,均质地层适合于简单的四分支垂向水平井,此井型具有最大的控制面积,且所有分支都起到沟通作用,效率最高,此类地层随井型变复杂产能有降低的趋势,非均质地层则羽状水平井具有优势,且1-2主分支、分支垂直于比较发育的割理方向的羽状水平井为最佳,在同一方向摆放3个以上的主分支会互相影响。
CBM reservoir can be divided into Ⅰ type, Ⅱ type as welt as Ⅲ types. Different type suit for different bering well plans. CBM reservoir of Qinshui basin belongs to the Ⅱ and Ⅲ type, which is suitable for the simple horizontal well with more than three branches and multi-lateral horizontal well. By digital anology, it shows that homogeneous formation suits for the simple horizontal well with four branches and 90 degree angle, Which has the biggest controlling area and all the branch can link up the cleat. As for this kind of CBM reservoir, the more complicated the boring welt is, the lowest outcome is. Heterogeneous formation suit for multi-lateral horizontal well. Pinnate horizontal well with one to two main branch and branch is vertical to the well-developed cleat is the best.
出处
《中国煤层气》
2011年第1期43-47,共5页
China Coalbed Methane
基金
国家重大专项36"煤层气钻井工程技术及装备研制"项目资助
关键词
沁水盆地
煤层气
钻井方案
优选
Qinshui basin
coalbed methane
boring plan
optimize
