Yongchuan deep mountain shale gas block is located in Huayingshan fold belt

which is a low anticline group with broom like spreading to the south. The structural folds are strong and the faults are developed. The target layer of Longmaxi Formation has the characteristics of great difference in burial depth

high ground pressure and ground temperature and large difference in horizontal stress

while the crossing layer has strong abrasiveness

easy instability of well wall and poor drillability. The lack of early geological knowledge leads to low drilling time

long construction period and frequent complex situations

and the fracturing effect of multiple wells is not ideal. In order to solve the main problems faced by Yongchuan work area

researches on the geomechanical parameters

such as drillability

hardness

abrasiveness laboratory experiments

drillability profile establishment

formation three pressure prediction

3 D in-situ stress finite element

simulation and fracture propagation simulation under different horizontal stress difference modes

and horizontal well geological engineering double sweet spot prediction

have been conducted respectively. The results show that the formation drillability level is high

the safe drilling fluid density window is narrow

the difference of in-situ stress direction is large

and the formation of hydraulic fracturing network is affected by high stress difference.Based on the research results of geomechanics

the engineering technology has been adjusted. The drilling speed and fracturing production increase effect are obvious

which has reference significance for the development of deep shale gas in South Sichuan.