Progresses in surface gathering techniques in coal-bed methane (CBM) fields

From cluster tests to large-scale development, production of coal-bed methane (CBM) in China experienced rapid growth in the past decade. Relevant processes and techniques suitable for CBM gathering have been developed. This paper expounds the history of CBM development in China, and introduces the state-of-art technologies adopted in the Qinnan CBM Development Project, together with pipeline structures and processes adopted in Fanzhuang Block of Qinnan CBM Field, Hancheng Block in Edong CBM Field and other typical CBM development projects. Moreover, this paper presents the problems in CBM surface gathering in respect of pressure, gas purification, inter-well pressure balance and produced water treatment. Specific suggestions on future researches are also proposed.