Model of wellbore stability and parameter sensitivity analysis in fractured formations with consideration of drilling fluid invasion

Numerical Study on Drilling Fluid Loss in Fracture–Vuggy Formations Considering Multi-Medium Fluid–Solid Coupling

Structural fractures and karst cavities are widely developed in deep and ultra-deep carbonate reservoirs, providing preferential pathways for rapid fluid migration while increasing the risk of severe drilling fluid loss. To investigate the lost-circulation mechanism in fractured-vuggy formations, a hydro-mechanically c...

Numerical modeling of excavation-induced fracturing in rock foundations: a case study from the tectonically active Zagros Region

Wellbore Stability Assessment of the Luzhou Block Shale Gas Reservoir Based on Mogi–Coulomb–Jaeger Failure Assessment Model

During deep shale gas development, complex in situ stress conditions, abnormal formation pressure, and well-developed bedding planes result in complicated wellbore instability mechanisms. Conventional homogeneous rock models are unable to accurately characterize the different failure behaviors between matrix failure an...

Analysis and Fracturing Optimization of Horizontal Principal Stress Difference in the Basal Tight Zone of G Reservoir Based on Rock Mechanics Parameters

This study investigates the distribution of horizontal principal stress differences in the basal tight zone of G Reservoir through rock mechanics parameter analysis, aiming to address regional variations in fracture creation/proppant placement difficulties and non-targeted proppant strategies during fracturing. A rock...

Cement interface failure analysis of underground gas storage wellbores based on abaqus with implemented cohesive modeling

Aiming at the problems of wellhead uplift and casing–cement sheath interfacial failure in gas storage injection–production wells under cyclic operating conditions, this study analyzes the damage evolution of the bonding interface and the resulting wellhead uplift by considering the multi-string casing structure and the...

Analysis of Drilling Fluid Loss Behavior in Deepwater Shallow Formations

Deepwater shallow formations are typically weakly consolidated, highly porous, and highly permeable, which results in a narrow safe-density window and makes drilling fluid loss highly sensitive to small wellbore-pressure fluctuations. In this study, a finite-discrete element method (FDEM) model implemented in MultiFrac...