Wellhead Christmas Tree

For Oil and Gas exploration. The Wellhead and Christmas Tree are composed of three parts, including a casing head, tubing head, and oil (gas) tree, used to connect casing string, tubing string, and sealing layers between the casing and tubing of the annular space between, so to control the wellhead pressure and wellhead flow, it also could be used for acid fracturing, water injection, testing, and other special operations.

Types of Processes for Oil and Gas Wellhead

The Oil field oil and gas Wellhead Christmas Tree is an assembly of valves, spools, and fittings for an oil well, and is designed to direct and control formation fluids from the well. It can provide an inlet for production tubing strings, including all components above the tubing head adapter. Wellhead Christmas Tree assemblies can constitute many different kinds of combinations to meet any special requirement. Based on their different functions, Wellhead Christmas Tree can be classified into such special Wellhead Christmas Tree as oil production (flowing and artificial lift) Wellhead Christmas Tree, gas (natural gas and various sour gas) production Wellhead Christmas Tree, water injection Christmas Trees, thermal recovery Christmas Trees, fracturing Wellhead Christmas Trees, and acidizing Christmas Trees. Different pressure ratings serialize Wellhead Christmas Trees.

The gas production Wellhead Christmas Tree and tubing head are mainly used to produce gas and inject gas. The relative density of natural gas is low and gas column pressure is low, while wellhead pressure is high and liable to leakage regardless of gas production and gas injection. Sometimes natural gas contains corrosive media such as H2S and CO2. Therefore, the gas production of Christmas Tree calls for rigid requirements on both its materials and its sealing characteristics. For the sake of safety, two gate valves are used on the tubing and casing respectively. Some gate valves to be used on high-pressure and ultra-high-pressure gas wells are integrated valves manufactured from high-quality forged steel.