There is an upcoming" P&A wave" of wells that need to be permanently plugged and
abandoned, especially in mature, offshore areas such as the North Sea and Gulf of Mexico …

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 …

During large-scale multistage hydraulic fracturing in shale-gas wells, the cement sheath
loses its integrity easily because of repeated temperature and pressure variations in the …

This paper focuses on the effect of repeated loading and unloading conditions on cement
sheaths during staged fracturing. Triaxial compression and cyclic loading/unloading tests …

Cement sheaths are among the most important barrier elements in petroleum wells.
However, the cement may lose its integrity due to repeated pressure variations in the …

Cement seal failure is common in heavy oil thermal recovery wells, but the effects of steam
stimulation on wellbore interface seal performance is unclear. The finite element model of …

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 …

Wellbore leakage is complicated to understand due to the range of potential leakage
pathways and uncertainties regarding their capacities. In this study we present a novel …

In this experimental study, two different cementitious materials, including (i) a class of
expansive cement currently used for plug and abandonment (P&A) operations and (ii) a non …

Environmental protection is an increasing concern for plugged and abandoned wells within
the Gulf of Mexico. Leakage, however, has been shown to occur before the plug and …