T The casing planning of a drilling well aims to get a technically strong casing circuit to protect the well during the drilling process and subsequent processes. In general, the factors that affect the casing are whether the casing is safe and economical to use in the well. In this final project the casing plan will be evaluated in the OGN-A10 field which has a casing configuration that is surface casing 13 3/8 "with K55-54.5 ppf grade, intermediate casing 9 5/8" with K55-36 ppf grade, and production casing 7 "with K55-23 ppf grade. In this evaluation, it will be discussed whether the casing grade used in the OGN-A10 well is safe, optimal and economical for the well. So that the results of this evaluation can be used for further well casing configuration by reviewing the value of security and economics. The method used in this evaluation is the maximum load method, namely by calculating the load contained in the casing such as load collapse, burst load, and tension load. And the safety of the casing will refer to the safety factor used in the OGN-A10 well, the safety factor used in each load that occurs on the casing is collapse load, burst load, and tension load held by the casing on the well OGN-A10 . In evaluating the OGN-A10 wells the results of the evaluation are on the surface casing which can be optimized by changing the actual casing, namely the K-55 grade casing with 54.5 ppf can be optimized with H-40 grade casing with 48 ppf. Whereas in the intermediate casing and production casing, the casing used is optimal. Evaluating the casing by optimizing the surface of the casing can increase the level of economy in the cost because the lower the casing's resistance in holding the load the more economical and efficient the costs will be. Basically in evaluating the casing in the OGN-A10 well it aims to see the optimization level of the casing and whether it can be optimized again. It aims at other wells in the OGAN field.