The shale gas fields in Southern Sichuan are developed in an integration mode of testing

production and transmission

which has realized the development goals of cost reduction

emission reduction

fast production commissioning and early returns.However

a lot of empirical practices serve as reference of decision-making during implementation of integration practices. There is a lack of general guidance. In order to study the post-frac soaking

the flowback system and the drainage measures

the experiments of overpressured NMR imbibition

permeability stress sensitivity and gas-liquid two phase percolation are conducted

the flow regime and the distribution of pressure profile are simulated

and the discharge and production effect of more than 30 wells in Southern Sichuan shale gas field has been evaluated. The results show that the entry of fracturing fluids into reservoir through imbibition is beneficial to increasing the complexity of shale cracks

and the optimal shut-in time of Southern Sichuan shale gas field is 4～10 days. Meanwhile

a six-staged flowback system is formed

and a post-frac drainage guide chart is established. It is determined that tubing and manual lifting should be implemented when the flow regime changes and the tube should be installed at the well deviation of 70° ～ 85°. Besides

the drainage strategy is also proposed. In general

the research results are of great significance for guiding post-frac production control and drainage technology.