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Research on design models of multi-lateral well structure for coal-bed methane
Author(s): 
Pages: 113-117
Year: Issue:  6
Journal: ACTA PETROLEI SINICA

Keyword:  煤层气多分支井流体管路层流紊流井身结构设计模型;
Abstract: 煤层裂缝系统由众多不同类型的裂纹组成,原始裂纹与应力变化产生的新裂纹形成网状结构.煤层气多分支井增产机理在于实现广域面的效应,可以大范围地沟通煤层裂隙系统,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.根据流体管路串联和并联原理,建立了层流和紊流条件下的分支井眼长度与直径的约束方程,推导出多分支井身结构协调方程,建立了多分支井身结构设计的理论基础.根据不同的煤层地质条件,设计出2类紊流型和3类层流型的多分支井身结构模型,可用于煤层气田多分支井优化设计.
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