Abstract
Operators globally are consistently challenged to deliver effective cement sealing for Zonal Isolation (ZI) between reservoir units and to prevent Sustained Annulus Pressure (SAP). This paper discusses such a challenge for a land well drilled in West Africa and how these challenges were addressed. The challenge was to achieve effective ZI of a depleted sand gas reservoir and provide B annulus isolation to prevent future SAP. The challenges arose from a combination of losses (during drilling and cementing) and potential gas invasion into the cement during the cement curing process. The solution utilized three Metal Expandable Packer(s) (MEP), two of which were expanded within wet cement. The MEP purpose is to deliver ZI Cement Assurance (CA) across the reservoir and one MEP set above Top of Cement (TOC) within the Open Hole (OH) to protect the B annulus from (SAP). Both solutions improved the overall well integrity, providing mitigation from cross flow, early water production and the risk of methane emissions release into the atmosphere.