Multi-Criteria Decision-Making Approach to Material Selection for Abandonment of High-Pressure High-Temperature (HPHT) Wells Exposed to Harsh Reservoir Fluids.

Portland cement is the primary barrier material for well abandonment. However, the limitations of cement, especially under harsh downhole conditions, are necessitating research into alternative barrier materials. While several alternatives have been proposed, the screening process leading to their selection is scarcely discussed in the literature, resulting in the non-repeatability of the selection process.