Gas Seepage Rule and Productivity Analysis in Designing Coalbed Methane Wells

Based on the characteristics of coalbed methane formations and the parallel-connection pipeline principle, we have formulated a model for calculating the pressure drop and the production of a horizontal multi-branch coalbed methane well. We have analyzed the effect of the number of side branches, the length and angle of intersection of the side branches with the main branch on the well productivity. The results show that with an increase in branch spacing, the productivity first decreases and then increases; with an increase in the angle of intersection and the length of the side branches, the productivity increases.