Evaluating the subsidence above gas reservoirs with an elasto-viscoplastic constitutive law. Laboratory evidences and case histories

Musso, Guido; Volonté, Giorgio; Gemelli, Fabrizio; Corradi, Anna; Nguyen, Sinh-Khoa; Lancellotta, Renato; Brignoli, M.; Mantica, S.

doi:10.1016/j.gete.2021.100246

Cited by 7 publications

(1 citation statement)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For instance, hydraulic fractures opened by proppants can eventually close over time, leading to reservoir permeability loss and thus production reduction (Guo and Liu, 2012;Li and Ghassemi, 2012;Rybacki et al, 2017). The time-dependent deformation of shales is often invoked as one of the main mechanisms for the reservoir compaction or surface subsidence (Hagin and Zoback, 2007;Chang et al, 2014;Musso et al, 2021). In addition, the time dependence of shales has also been closely related to the evolution of the state of in situ stress.…”

Section: Introductionmentioning

confidence: 99%

Time-dependent deformation of Wufeng-Longmaxi shale and its implications on the in situ state of stress

Wan

Zhang²,

Jin³

et al. 2023

Front. Earth Sci.

View full text Add to dashboard Cite

The stress-strain relationship in shales is generally time-dependent. This concerns their long-term deformation in unconventional reservoirs, and its influence on the in situ stress state therein. This paper presents an experimental investigation on the time-dependent deformation of the Longmaxi shale gas shale. A series of creep experiments subject the shale samples to long-term, multi-step triaxial compression. It is found that the shale samples exhibit varying degrees of time-dependent deformation, which can be adequately described by a power-law function of time. The experimental results establish the relationship between the elastic Young’s modulus and viscoplastic constitutive parameters, which are different from previous those derived from North American shales. Based on this viscoplastic constitutive model, the stress relaxation and the differential stress accumulation over geologic time scales can be estimated. It is found that linear elasticity substantially overestimates the differential stress accumulation predicted in the context of viscoplastic relaxation. The characterized viscoplasticity and stress relaxation are of vital importance for various geomechanical problems in shale reservoirs.

show abstract