Coal bed gas well drilling well bore structure

The utility model relates to a coalbed gas develops technical field, discloses a coal bed gas well drilling well bore structure, include: by colliery underground operation face department to along thehorizontal direction in proper order to first trompil footpath section, second trompil footpath section and the third trompil footpath section of internal drilling in the coal seam, the aperture of second trompil footpath section is less than the aperture of first trompil footpath section, the aperture of third trompil footpath section is less than the aperture of second trompil footpath section.This coal bed gas well drilling well bore structure has saved straight well section, inclined shaft section, and the purpose coal seam is crept into promptly in the trompil, has reduced the input cost under the prerequisite that has reduced the geology risk, and it is long -pending to have strengthened flow surface, can carry out the later stage raising the output and transform, and gas control is efficient and the pertin