Application of titanium alloy in petrochemical industry
Since its discovery, titanium metal has been most used in the chemical industry. In the past 12 years, the domestic chemical industry has consumed more than 15,000 tons of titanium every year.
Titanium Reliable 001: Titanium has higher strength and greater working ability
Don't underestimate the all-titanium alloy drill pipe, this drill pipe.
The specific strength of TA is 3.5 times that of stainless steel, 1.3 times that of aluminum alloy, and 1.6 times that of magnesium alloy. The same weight can withstand greater impact and pressure.
The tensile strength of TA is 1.5-2 times that of other alloy partners. Safer and more durable when drilling underground. It is especially suitable for drilling operations in complex well conditions such as ultra-deep wells and short-radius wells in northwest oil fields.
strength
Titanium alloy Ti-6Al-4V
Stainless steel 18-8
Aluminum alloy
Tensile strength/MPa
960
608
470
Yield strength/MPa
892
255
294
In recent years, in order to improve crude oil recovery, reduce oil and gas field production costs, and extend oil and gas field development life, more and more complex structure wells have been developed, such as extended reach wells, short radius wells, extended reach wells, etc. Old well with windowed sidetrack horizontal well. Conventional drill pipe encounters some difficulties when used in these complex well structures. For example, in ultra-short radius horizontal wells, the wellbore curvature is very small (<18m), which results in large alternating stresses in conventional drill pipes. Fatigue fractures of drill pipes caused by alternating stress often occur, causing heavy losses to oil fields. In order to solve these problems, foreign countries have begun to use new materials to develop titanium alloy drill pipes, aluminum alloy drill pipes, composite drill pipes, etc. to replace traditional drill pipes.
The laboratory has confirmed that when the cyclic stress is between 30,000psi and 40,000psi, the fatigue life of titanium is 10 times that of ordinary steel. The elastic coefficient of titanium alloy tube is about 16.5msi. It has better elasticity than steel drill pipe and is more suitable for well sections with large curvature. . At present, titanium alloy drill pipes with good economic performance have been produced. The Ti-6Al-4V pipe body consists of upsetting at both ends and butt welding joints at both ends. Titanium tube body dimensions comply with API standards and length ranges. Specifies scope 2 or 3 for API standards. In order to reduce manufacturing costs, the drill tool joint is made of steel, the joint thread is penetrated through the upper shackle, and the outer diameter of the joint is welded with wear-resistant tape. Titanium alloy drill pipe is also used in ultra-deep wells and extended-reach wells. Due to the low density of titanium alloy, it can reduce the hook load by 30%, reduce the torque by 30-40%, significantly improve the pulling force margin and safety factor of the drilling tool, and improve the ability to handle complex accidents.
In daily environments, the service life of titanium alloy drill pipes is 10 times that of conventional steel drill pipes of the same specification; in corrosive environments, the service life is 100 times that of traditional steel drill pipes.
In addition to drill pipes, offshore oil platform pillars, heat exchangers, pumps, valves, etc. are also widely used in oil production and refining. For example, the U.S. North Sea oil drilling platform uses 100 titanium heat exchangers; Norway's Heidrum project uses the world's first titanium high-pressure riser shaft.
Titanium Reliable 002: Titanium is more corrosion-resistant and has a longer service life
On offshore oil exploration platforms, the corrosion of structural parts caused by biological pollution is quite serious. Devices made of traditional metals are often half-dead. But the surface of titanium has a naturally formed dense, inert, rust-proof, and corrosion-resistant oxide film. Easily resists seawater without additional preservative treatment. , sulfuric acid, petrochemical corrosion. Titanium alloy components can help oil drilling reach deeper waters and deeper wells, including higher temperatures and severely corrosive (i.e., salty) production environments.
With titanium, the rig can explore without fear!
Most of my country's natural gas resources are sulfur-containing gas fields, such as Tarim in Xinjiang and the Sichuan Basin, which are high-sulfur gas fields. Anti-corrosion of oil and gas field pipelines with high H2S2 and C2O2 content and long-term use under high temperature and high pressure conditions are difficult problems in oil and gas development. At present, the selection of high-quality corrosion-resistant materials for pipelines has become the dominant trend. Titanium alloys are used in environments with high sulfur content due to their excellent resistance to pitting corrosion, especially in harsh working conditions with high Cl and H2S content. Generally speaking, stainless steel and even nickel-based alloys will corrode.
Titanium Reliable 003: Titanium·lighter and more flexible in operation
Although the titanium alloy rod is more powerful than the steel rod, the titanium alloy rod is also lighter, weighing almost half of the steel rod... Because the titanium alloy rod is lighter, the drilling torque is reduced by nearly 50%, and the corresponding load on the top ground drive is higher Small (PS: smaller force, deeper and more stable drilling), and the equipment is not so easy to break. Therefore, titanium rods are strong and lightweight, saving more labor, fuel and equipment.
