Because of the advantages of high gas production and low cost,U-shaped CBM well with production casing has gradually become main well type. The buried depth of coalbed is generally less than 500m in Panzhuang block and the horizontal section for U-shaped well is required to be about 1000m. For the shallow vertical depth and long horizontal section, production casing running is a technical difficulty in U-shaped CBM well of this block. In the tests in several wells, by optimization of drilling trajectory smoothness, 3 times of sweeping with original drilling tools, short spiral centralizer and drill collar in production casing as well as strict control on casing lowering program, the success rate of one-time casing lowering can be increased with higher production efficiency.