煤层气分支井井身结构设计模型研究

Research on Well Structure Design Models for Coalbed Methane Multi-Branch Wells

煤层气是一种以吸附态储集在煤层中的天然气资源。煤层气分支井增产机理在于实现了广域面的效应,可以大范围沟通煤层裂隙系统,扩大煤层降压范围,降低煤层水排出时的摩阻,大幅度提高单井产量和采收率。根据流体串联和并联管路设计原理,设计出两类紊流型和五类层流型的分支井身结构模型,为煤层气田分支井优化设计提供了重要基础。

Coalbed methane is a natural gas resources adsorbed to the coal reservoir. The yield mechanism of coalbed methane multi-branch wells is achieving the effect of the wide area surface, which can link coalbed fissure system in large-scale, enlarge the scope of coalbed descent region, and reduce the friction When water discharged from the coalbed, so individual well producing rate and recovery ratio are improved substantially. According to series and parallel pipe fluid design principle, two types of turbulence branch well structure and five categories of laminar flow branch well structure model are designed, which provided an important foundation of multi-branch wells’ optimization design in coalbed Methane field.