3. Wellhead Installation and Casing Pressure Test

After the casing is cemented, the wellhead is installed during the solidification of the cement. The top end of the surface casing is to be the casing of the casing head. The top end of each layer of casing is hung in the casing head. The casing head is mainly used to support the weight of the technical casing and the oil casing, which is especially important for the cementing cement not returning to the ground. The casing head is also used to seal the annular space between the casings to prevent pressure build-up. The casing head is also a transitional connection between the blowout preventer and the tubing head. There are also two side ports on the casing head for use on the land to replenish cement and monitor well conditions. Note the operation of balance liquid.

Casing pressure testing is an important part of checking cementing quality. After installing the casing head and connecting the blowout preventer and the blowout preventer line, the pressure resistance check of the casing head seal and the seal pressure test connected with the blowout preventer are required. After testing the cement plug in the casing, the pressure test of the casing string should be carried out. After drilling through the casing shoes for 2~3 meters (technical casing), the ground fracture test should be carried out. The production well should be tested for the quality of the cement ring, and the sound wave should be used to detect the cementation of the cement ring and the casing and the borehole wall. After all the indicators of cementing quality are qualified, the next operating procedure can be entered.