The reservoirs of Yanhu Gas Field are shallow buried with many gas layers

whose gas bearing areas are different. The reservoirs characterized by high porosity and medium to low permeability with no unified gas-water interface are the rare small edge water gas reservoir of ultra-shallow loose sandstone layer. In general

shallow oil and gas reservoirs in China are easy to produce water and sand in the process of exploration and development

of relatively low productivity

great stable production difficulty. In the process of production the formation pressure decreases quickly

and the elastic yield is low. In order to realize the benefit development of small gas field

according to the geological characteristics of the gas field

and on the basis of reasonably division of development layer series and group

the well distribution mode along the axis

occupying high point and dense at the top and sparse at edge for Yanhu Gas Field is determined by referring to the well pattern deployment method of loose sandstone edge water gas reservoir. Then adopting the development from deep to shallow is used to succeed the production by flowback

so as to realize the targets of long-term stable production with less wells and lower cost. Therefore

succession sequence of reasonable reserves

productivity and production for gas fields is ensured. Finally

the best development effects and economic benefit are obtained.