多分支水平井技术提高煤层透气性机理分析及数值模拟

Mechanism Analysis and Numerical Simulation of Multi-lateral Horizontal Wells on Improvment of Gas Permeability

本文研究了煤层瓦斯解吸-扩散-渗流的运移规律;分析了多分支水平井技术的增透机理:增大瓦斯解吸影响面积,沟通煤层裂隙并促进裂隙发育,降低瓦斯流动阻力。以山西晋城煤层气田为例,通过分支井产量模型研究分析得出分支数目和分支段长对产能的影响关系:分支井数目越大,抽采效果越好;分支井长度越长,抽采效果越好。

The gas migration law in coal bed is revealed to be a process with desorption, diffusion and percolation. The Mechanism of increasing permeability is analyzed by the technology of muhi-lateral horizontal wells：increasing the Area affected of gas desorption, communicating the cracks in coal and promoting the development of the cracks, and reducing the flow resistance of gas. With well production model, Shanxi Jincheng Coal Bed Gas Field is taken as an example to find the influence of the amount and length of the branches on production. The greater amount and length of branch wells are, the better effect on gas extraction will be.