Abstract: Well Su 4K-P4 is a typical horizontal well for gas injection and withdrawal in Su 4 underground gas storage.In this paper, a "static differential pressure method" program was prepared to deal with its lost circulation.In this program, the liquid volume injected inside the casing is controlled, so the downhole tools can be actuated by using the static differential pressure.Thus, liner cementing is completed.The logging data after the cementing indicates that the technical casing in the upper layer is damaged.According to "twosection tie-back cementing", two hangers are designed and tie-back cementing is carried out by segments.Based on logging data, qualification rate and high quality rate of cementing are 100% and 41.5%, respectively.This technology provides the new technical thought for the completion of complex storage wells.