A similar form of words are used in ISO 16530 well integrity standard Accountability is the position that ensures a particular task is being done.
Common threats to tubing integrity are erosion and corrosion by production fluids, which denude the steel.
The major integrity issues comes from the differential pressure across the casings due to the weight of brine on either side.
The wellhead and the tree are typically suitably engineered to be able to withstand the normal operating pressures.
The major integrity issues for these components surround the operation of the valves, which are prone to leaking.