Qatar Petroleum’s supergiant Dukhan field located onshore Qatar has a mature well inventory of hundreds of wells. Mitigating well integrity risk without affecting crude oil production and water injection targets is critical to sustaining revenue streams from the field. This involves a large number of integrity repair wellwork with workover rigs. Performing such a wellwork campaign is time-intensive and without adequate prioritization has the potential of jeopardizing well integrity and causing safety/environmental issues besides adversely affecting the production and injection levels.This paper discusses a qualitative model that has been developed and used to prioritize repair wellwork in Dukhan field. The model is centered round integrity risk level and revenue potential of wells. A set of integrity parameters including status of surface and downhole barriers determines integrity risk level. Another set of reservoir management and well capability parameters determines revenue potential. Each of the wells is then assigned scores to reflect the risk level and the revenue potential. Cross-scaling of such scores defines the priority of a repair wellwork. Using the above approach for wellwork prioritization has been effective in mitigating integrity risk and maintaining revenue potential of the large inventory of mature wells.


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