Wellhead equipment and Christmas tree equipment

Wellhead equipment and christmas tree is the wellhead extraction of important equipment, the casing head, tubing head, oil (gas) tree of three components, used to connect the casing string, tubing string, and sealing layers casing and between and Tubing between the annular space, and can control the production wellhead pressure and adjust the oil (gas) wellhead flow can also be used for acid fracturing, water injection, testing, and other special operations