Technologies of Natural Gas Gathering and Purification in Changqing Gas Field

Since being explored and constructed for nearly twenty years,Changqing Gas Field has owend nine gas fields in production or under planning.Its productivity grows by leaps and bounds and has ranked the top of China.Sulige Gas Field,as a part of Changqing Gas Field,has the gas geological reserves of over a trillion cubic meters,its successful development is not only the important guarantee for the output target of 50 Mt/a of oil and gas equivalent of Changqing Gas Field,but also an outstanding model of developing Three Lows(i.e.low permeability,low pressure and low abundance) gas field in China by its unique surface gathering system technologies.The article describes the core technologies of surface gathering system according to gas field construction steps,the respective characteristics and adaptable range for each gas field in Changqing Gas Field.At the same time,it introduces the gas purification process using MDEA desulfurization and decarburization technique,and the oil removal and dehydration process using propane refrigerating low temperature separation technique,which are adopted respectively by the gas fields in Changqing Gas Field.