Christmas tree
Oil tree is a kind of professional steel used in the oil and gas industry. It usually refers to the steel used to manufacture oil trees and wellhead devices.
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The oil tree is the main equipment for controlling and regulating oil and gas production at the top of the oil and gas well. It consists of a tubing hanger and many gates and tees or crosses, which is directly installed on the casing head. The oil tree are equipped with a nozzle (choke nozzle), and the oil and gas production is controlled by replacing nozzles with different inner diameters. Its functions include hanging the oil pipe, supporting the weight of all the oil pipe strings in the well, sealing the annular space between the oil pipe and the casing, controlling and regulating the production of the oil well, ensuring various downhole operations, and recording oil pressure, casing pressure data as well as daily production management such as pressure measurement and wax cleaning.
Main Functions
Control oil and gas flow:
The Christmas tree controls the inflow and outflow of wellhead fluids through valve systems such as the main valve, safety valve, and control valve to control the output and flow of oil and gas.
Flow control:
Controls the flow of produced oil and gas or water/gas injected into the reservoir, and adjust the production of oil and gas through the nozzle (throttle valve).
Well sealing and safety protection:
In an emergency, the Christmas tree can quickly close all valves and seal the wellhead to prevent oil and gas leakage or blowout accidents.
Christmas tree rating parameters
| Parameter | Description |
| Parameter | Value / Description |
| Rated Working Pressure | 15,000 psi |
| Grade Material | AA, BB, CC, DD, EE, FF, HH |
| Nominal Diameter | 2″, 3″, 4″, 5″ |
| Temperature Class | U (-20°C to 121°C), K (-40°C to 121°C), N (-60°C to 121°C) |
| Properties Requirement | High strength, corrosion resistance, suitable for sour gas |
| Product Specification Level | API 6A PSL 1, API 6A PSL 2, API 6A PSL 3 |
Christmas Tree Components
Qilu Oil Exploration and Production (E&P) Products
Application of Christmas Tree
Oil and gas exploration and production
In oil and gas E&P, Christmas trees are crucial for making wellhead, tree gear, drill pipes, tubing, and casing reliable and safe in high-pressure, corrosive settings.
Oil and gas transportation
Oil trees facilitate the production of pipeline steel for long-distance oil and gas transport, requiring high strength and corrosion resistance.
Oil and gas storage tanks
In oil and gas storage facilities, oil trees are used to manufacture storage tanks and pressure vessels. These materials need to have good welding performance and corrosion resistance to ensure long-term safe storage.
Deep-sea oil and gas development
Deep-sea oil and gas exploration demands Christmas trees and equipment that can withstand high pressure, low temperatures, and corrosion.
Refining and chemical equipment
In the refining and chemical industries, petroleum trees are used to manufacture equipment such as reactors, heat exchangers, pipelines and pumps, which usually needs to work in high temperature and corrosive media.
LNG and CCUS projects
In the production and storage of liquefied natural gas (LNG) and carbon capture, utilization and storage (CCUS) projects, petroleum trees are used to manufacture cryogenic storage tanks and related equipment, which need to have extremely low temperature adaptability and good corrosion resistance.
Maintenance and inspection
Check valve seals:
Regularly check the sealing performance of all valves on the Christmas tree to ensure that there is no oil or gas leakage. This is essential to ensure operational safety and environmental protection.
Maintain pressure gauges and control devices:
Ensure that all pressure gauges are accurate and pressure control devices are operating normally to avoid safety accidents caused by excessive pressure.
Check connecting parts:
Check the parts connecting the Christmas tree and the wellhead, such as manifolds and valve brackets, to ensure that they are firmly connected and have no signs of corrosion or damage.
How it works
The Christmas Tree integrates the various wellhead components by means of upper and lower flanges and secures the tubing hangers for high-precision operation. Once the tubing string is lowered into the wellbore, the tubing hangers are placed in a designated location inside the Christmas tree and a packer or seal assembly is used to ensure a tight seal. The side outlets of the Christmas tree are used to relieve pressure or test fluids and gases, and can also be used to inject completion fluids or to facilitate downhole intervention. The Christmas Tree’s main valve is critical to controlling the flow of hydrocarbons in the well, while safety valves automatically relieve pressure in the event of overpressurization to protect well integrity and personnel safety. Christmas Tree’s control system includes throttle and wing valves to accurately regulate well productivity and pressure, optimizing the production process and maintaining operational efficiency.
Qilu Christmas tree
Your Excellent Christmas tree Manufacturer
The oil tree, as the core device of oil and gas wellhead control, plays a vital role. It not only supports the oil pipe, controls the well pressure, and achieves sealing, but is also the key to maintaining wellhead safety. With the continuous development of the oil and gas industry, the design and application of the oil tree are also constantly improving to adapt to the increasingly complex and demanding operating environment.
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