With the increasing demand for energy

shale gas

as a new type of unconventional natural gas resource

has attracted more and more attention. At present

the commercial development of high pressure shale gas reservoir in China has been successfully realized

but the efficient development technology of shale in deep layer and normal pressure shale is still in the exploratory stage. The normal pressure shale reservoirs in China are mainly located in the residual syncline outside the basin. The deformation degree of structure is strong

the formation pressure coefficient is between 0.9 and 1.3

the buried depth is generally shallow

the formation energy is insufficient

and the daily production of single wel

l after fracturing is （1~5）×10

4

m

3

. All those problems result in the failure of commercial breakthrough so far. The fracturing technologies of high-pressure shale gas reservoirs have little effect in the process of normal-pressure shale reconstruction. Based on the difficult problems in the transformation of atmospheric shale gas wells

optimization has been carried out on many aspects such as the perforation mode

artificial fracture control and support technology

field construction technology and fracturing materials. The suitable network fracturing with high density is researched

and the multi-cluster fracture equilibrium extension and multi-scale artificial fracture network are preliminarily realized. The scheme has been tested in an normal pressure shale gas well of a certain shale gas block in southeast Chongqing

and good reconstruction effect has been obtained after fracturing.