A good bond between the well casing and cement is often considered essential for avoiding
generating microannulus leakage paths along the interface between the two materials. A …

Cement sheath is considered an important barrier throughout the life cycle of the well. The
integrity of the cement sheath plays a vital role in maintaining the integrity of wells. Cement's …

Debonding of well cement towards casing or rock, ie microannuli formation, is a typical
failure mode of cement barriers. Consequently, such microannuli may act as leak paths …

When the integrity of the annular barrier outside the casing is degraded, parts of the casing
in the abandoned well must be milled to place a permanent barrier. Considering the micro …

Leakages of greenhouse gases, such as methane and carbon dioxide from wells, may have
considerable environmental consequences. Although much emphasis is currently put on …

CO 2 geological sequestration technology injects CO 2 into the target geological formation
through a borehole. Usually, cement plugs are used to seal the well after finishing the …

The attempt to replace concrete aggregates and oil well cement additives with waste tires
accumulated year by year is considered sustainable and waste recycling. Notably …

Maintaining sealing integrity of cement sheath is essential to oil and gas well completion.
The development of large-scale hydraulic fracturing reservoir stimulation technology in …

Bismuth-based alloy plugs are currently potential alternative to cement plugs. These metal
alloy plugs demonstrated several distinctive properties, such as expanding after cooling …

Sealability of barrier material is required for successful plug and abandonment operations.
The emergence of geopolymer as a green alternative to ordinary Portland cement presents …