Using the method of geological analysis and taking the Shuigonghe syncline, Zhijin—Nayong Coalfield, as a case, the nonlinear occurrence of the geological conditions of the coalbed methane (CBM) in vertical section was discussed based on the measured data, and the academic viewpoint "unattached multiple superposed CBM-bearing system" was suggested and demonstrated preliminarily.

Daniudi gas field has some features,such as low pressure,low porosity,tight,and low productivity per zone and gap distance varies between zones,so coiled tubing separated fracturing technique was studied to reach balanced stimulation for multi-zone superimposed horizon.

Based on analyzing the limitations of Assembly-to-Order(AtoO) configuration system,a multi-level configuration design method for complicated Engineering-to-Order(EtoO) product was presented.