Wellhead device and Christmas tree equipment are important equipment for oil and gas production. They are used to connect casing string and tubing string, seal the annular space between each layer of casing and tubing, control the pressure of production wellhead and regulate the flow of oil (gas) wellhead. They can also be used for special operations such as acidizing fracturing, water injection and testing.

1. Wellhead device and Christmas tree are mainly composed of casing head, tubing spool and Christmas tree.

2. Applicable to various casing and tubing procedures and connection methods.