To date. the means of efficiently dealing with annular gas migration by way of cement slurry design has been unstructured in approach. The major tools still relied upon are past experiences and a basic knowledge of gas migration theory. Although an accepted procedure for determining a well's potential to flow is available} research has not been heavily conducted relating gas flow potential to a specific cement slurry performance required to achieve a predictable success.Instead. "types' of cements (low fluid loss. thixotropic. etc.) are recommended In relation to the degree of flow potential that may be encountered in a well.In response to this deficiency. a method was recently developed and published by Sutton and Ravi. 2 Labeled the Slurry Response Number. SRN. this engineering tool defines the capability of a specific cementing system to combat gas migration In a specific gas weil. It is the purpose of this paper to show -through several case histories -that this derived relationship does exist. and can be used to more efficiently design anti-gas migration slurries.More specifically. the field cases observed in this study display a relationship between the Gas Flow Potential (GFP)a mathematical term Indicating the probability of gas flow given a set of cement job conditions -and the more recently developed SRN. As reported by Sutton and Ravi, the SRN Is a number attached to a specific cementing system (cement. spacer. and drilling fluid). based on fluid loss and static gel strength properties. that directly grades the capability of a cement slurry to prevent gas migration. This unique rating system can be used very effectively for relative comparisons between cement slurries or as confirmed through the case histories presented In this text. can serve as a guideline in choosing a cement slurry design for a specific weil with a calculated gas flow potential.References and lIiustratlons at end of paper.