The exploitation of hydrocarbon reserves in High Pressure High Temperature (HPHT) and Ultra HPHT fields is challenging engineers and well designers to find casing configurations that will survive these extreme conditions.
The requirement to meet high collapse strength, based on traditional calculation methods, continues to push the limits of the wall thickness and material grade of the casing products. This creates a significant increase in well construction costs. Sometimes the current methodology makes it unfeasible for engineers to find a technical solution. An alternative approach would be to consider the structural support from other wellbore components, such as the cement sheath, that could significantly improve the casing collapse strength, thereby allowing thinner or lower grade casing to be used safely.
Attached File: Confined Collapse Capability