... tree is an important oil and gas mining equipment, from the casing head, tubing head, oil (gas) tree consists of three parts, used ... space between, and control production wellhead pressure and regulate oil (gas) wellhead flow, can also be used for acid fracturing, water ... levelPR1,PR2Material-level productsAA,BB,CC,DD,EE,FFApply MEDIAOil, gas, mud, etc API 6A wellhead christmas tree