Abstract: Dazhangtuo gas storage is used to adjust the gas supply in Beijing and Tianjin. Well Ku8 is a directional well drilled in the gas storage block, and its cementing is difficult due to the following problems:1. Low formation fracture pressure, which can cause lost circulation; 2. Low formation pressure factor, which can lead to formation damage; 3. Long cementing interval, and high thermal gradient of 3.4℃/100m, which delays the setting time of upper cement slurry and impacts its gelling. The following measures are adopted to cope with these problems:1. Adopt the temporary shielding cementing technique, to improve the pressure bearing ability of the formation; 2. Apply two-stage cementing. Common cement slurry is used for the first stage cementing, and lightweight cement mainly composed of micro sphere and micro silicate are used for second stage cementing; 3. Control the fluid loss of the cement and the content of free water; 4. Use more casing centralizers to improve the displacement efficiency. SBT logging shows a good cementing job in this well.