Abstract: Jilin Oilfield company discovered Yingcheng Formation of Changling Gas field in the middle platfood of Changling
rift. The volcanic reservoirs are characterized by complex lithologies and lithofacies，and extremely serious heterogeneity，
with well developed fracture，large volume of bottom water，and strong energy，which is difficult for the development of gas
reservoirs. To develop the Changling gas field volcanic gas reservoir，after obtaining a better understanding of geognosy，and
analysis of effective way of development，we established the developing style of the horizontal wells. By the optimization of
deployment and on-site geological orientation，the efficient employment of the reserves have been achieved，the success rate
of the horizontal well being 100%，gas drilling rate more than 92%.

Key words: Changling gas field, volcanic, fracture, horizontal wells, development techniques