API 6A Nickel Alloy 718 Christmas Tree Tubing Hanger in Petroleum and Gas Extraction

• Material: Inconel 718 is chosen for tubing hangers due to its excellent resistance to corrosion, high-temperature strength, and its ability to withstand high pressure and sour gas environments. It has a good combination of tensile strength, fatigue strength, and creep-rupture strength, which is crucial for the longevity and reliability of oil and gas extraction equipment.
• Design: The design of a tubing hanger as specified under API 6A needs to cater to various factors such as size, pressure rating, temperature rating, and compatibility with the tubing and wellhead it will be part of. The tubing hanger is designed to hang the tubing (pipe through which oil and gas flow) inside the wellhead and provide a seal between the tubing and the casing (larger diameter pipe around tubing).
• Sealing: API 6A requires tubing hangers to be equipped with effective sealing mechanisms to prevent leaks. Metal-to-metal seals or elastomer seals compatible with Inconel 718 and the environmental conditions are commonly used. The material’s properties ensure that the seal maintains integrity under temperature fluctuations and different pressures.
• Pressure Rating: The pressure rating of tubing hangers made from Inconel 718 must meet API 6A specifications, which categorize equipment based on working pressure ranges from 2,000 to 20,000 PSI. The specific rating will depend on the well's characteristics and the production requirements.
• Temperature Rating: Inconel 718 can withstand temperatures from cryogenic up to around 1300°F (700°C), making it suitable for applications across a wide range of temperatures. API 6A specifies equipment temperature class ratings from K (-60°C) up to Y (345°C), and Inconel 718 tubing hangers can be rated for high-temperature applications.
• End Connections: Tubing hangers come with different types of end connections, including threaded, flanged, or clamp hub, designed for easy integration with the wellhead system. The choice of end connection depends on the design of the Christmas tree and wellhead, as well as pressure and temperature conditions.
• Applications: Inconel 718 tubing hangers are used in oil and gas wells with harsh operating conditions, such as high-pressure wells, deepwater wells, and wells with corrosive environments. They are particularly valuable in applications where sulfide stress cracking (SSC) is a concern.

Inconel 718 is a high-strength, corrosion-resistant nickel chromium material used in a range of extreme environments. It is especially noted for its high yield, tensile and creep-rupture properties at temperatures up to 1300°F (700°C). Components made of Inconel 718 are frequently used in the oil and gas industry for parts such as those found in Christmas tree equipment due to the material's durability and performance in highly corrosive and high-pressure environments.

Chemical Composition(%):

The following table lists only some of the grades