What is casing head?

　　What is a casing head? Aibeibei tells you that the casing head is used to fix the wellhead of the drilling well and connect the wellhead casing string. It is used to support the gravity of the technical casing and the reservoir casing, seal the annular space between the pipes of each layer, and provide transitional connection for the installation of blowout preventer, tubing head and Christmas tree. Through the two side ports on the casing head body, it can carry out mud replenishment, monitoring and leveling Liquid balance and other construction operations.
　　The casing head is generally made of 35 or 42 Cr Mo alloy structural steel. A casing hanger is also arranged in the casing head to hang the casing string of corresponding specifications. Secondly, the BOP group should be installed. After well completion, Christmas tree is installed on casing head.
　　When drilling on land or offshore, in order to support and fix the casing string running into the well, install BOP group and other wellhead devices, a special short joint is connected with the top of casing string by screw thread or flange and located in the outer casing.

　　What is a casing head, Abe tells you
　　The production of casing head generally includes the following process:
　　1. Casting blank, casting the material into the rough embryo of the workpiece.
　　2. Rough cutting, rough cutting the workpiece.
　　3. Finish turning, the workpiece after rough cutting is processed to the designed precision by lathe.
　　4. Boring diameter, using boring machine, boring out the design inner diameter.
　　5. Drill the hole, use the drilling machine to drill out the outer connecting bolt.
　　6. Heat treatment, the workpiece is quenched and tempered.
　　7. Inspection and testing, will complete the processing process of the casing head, casing head advantage for geometric size, hardness, roughness and internal and external defects inspection and non-destructive testing.