The working environment of wellbore in Liaohe gas storage was rather severe, due to the cyclic bidirectional alternating loads and the influence of sand production and vibration. However, the risk of wellbore integrity would not only reduce the service life of the injection and production wells, but also lead to annulus pressure issues that may affect the operation safety. To solve the problem, a set of wellbore integrity technology was developed by continuous optimizing the drilling and completion processes, which were centered on wellbore structural design, the method of sealing casing string and casing head, and the method of improving cementing quality. Specifically, the integrity technology included special sealing for cap layers, the design of special drilling for reservoir layers, the helium sealing performance test, the self-healing cement system, and other supporting processes. Under the effects of the above methods, an additional sealing barrier was added to the cap layer section, which improved the safety of geological body. Moreover, the liners in the reservoir section were upgraded to L80-13Cr steel grade, and the pass rates of gas sealing detection for both casing string and casing head reached 100%, ensuring that the wellbore life in the paper to exceed 30 years. According to ultrasonic imaging results, the average cementing quality qualification rate of the wells was up to 98.9% after using the integrity technology in the paper, improved 2.8%. The average continuous high-quality section of cap layers was 153 m, which increased 20.2 m compared to previous wells. The above researches can not only provide guarantees for constructing high-quality gas storage in Liaohe area, but also lay a foundation for subsequent research on annulus pressure prevention and governance. Besides, it can also provide reference for drilling engineering of similar gas storage at home and abroad.