We present a review of plug and abandonment (P&A) practices in onshore wells, with a
particular focus on British Columbia (BC). Regulatory and operational practices are …

Presence of microannuli at the cement interfaces in wellbores could provide a path for fluid
leakage. In this study, we combined experimental analysis and numerical modelling to …

During large-scale hydraulic fracturing in shale gas horizontal wells, a cement sheath easily
loses its integrity due to the fluctuation and continuous change of wellbore temperature and …

Creep, the time-dependent deformation of rock, will increase the pressure applied on the
interface between the cement and formation. The objective of this paper is to study the …

Rock salt cavities are commonly utilized for underground gas energy storage on a big scale
due to their characteristics of low permeability and low porosity. Salt cavern wellbore leaks …

Well drilling, completions, stimulation, and enhanced oil recovery operations induce
downhole conditions that may negatively impact the integrity of the annular seal and …

Due to their good air tightness and stability, gas storage salt caverns are widely used in
rapid peak shaving of natural gas. The wellbore is used to connect the cavern to the surface …

The loss of well integrity in oil and gas and CO 2 injection wells provokes leaks that
potentially pollute underground water reservoirs and the surrounding environment. The …

Cement sheath interfaces, which are potential gas leakage channels, play an important role
in the safe operation of salt cavern underground gas storage (UGS) because the wellbore …

A fundamental understanding of the mechanical properties of zonal isolation materials is
important for predicting well integrity during well operation conditions. Conventionally, the …