Titanium Welded Tube for Petroleum Introduction
Titanium tube has a series of advantages such as low density, good corrosion resistance, high strength, high hardness, high pressure resistance, high and low temperature resistance. Therefore, titanium tube has a wide range of applications in the exploration and production of petroleum, natural gas, and geothermal industries.
1.Introduction of titanium welded tube for petroleum
Titanium tube has a series of advantages such as low density, good corrosion resistance, high strength, high hardness, high pressure resistance, high and low temperature resistance. Therefore, titanium tube has a wide range of applications in the exploration and production of petroleum, natural gas, and geothermal industries. Applied to drill pipe, offshore platform bearing frame, downhole pipe fittings, stress joints, CNOOC production, oil well maintenance support frame and offshore platform tensioning components, deep water riser, kill line, output riser, etc.
2. Chemical composition of titanium welded tube for petroleum
|
Grade |
Al |
Sn |
Mo |
V |
Cr |
Fe |
Zr |
Si |
Fe |
C |
N |
H |
O |
Ti |
|
Gr5 |
5.5- |
/ |
3.5- |
/ |
/ |
/ |
/ |
0.30 |
0.08 |
0.05 |
0.015 |
0.20 |
Balance |
|
|
TC6 |
5.5- |
/ |
2.0- |
/ |
0.8- |
0.2- 0.7 |
/ |
0.15- 0.4 |
/ |
0.08 |
0.05 |
0.015 |
0.18 |
Balance |
|
TC9 |
5.8- |
1.8- 2.8 |
2.8- 3.8 |
/ |
/ |
/ |
/ |
0.2- 0.4 |
0.40 |
0.08 |
0.05 |
0.015 |
0.15 |
Balance |
|
TC11 |
5.8- 7.0 |
/ |
2.8- 3.8 |
/ |
/ |
/ |
0.8- 2.0 |
0.2- 0.35 |
0.25 |
0.08 |
0.05 |
0.012 |
0.15 |
Balance |
|
TC18 |
4.4- 5.7 |
/ |
4.0- 5.5 |
4.0- 5.5 |
0.5- 1.5 |
0.5- 1.5 |
≤0.3 |
≤0.15 |
/ |
0.08 |
0.05 |
0.015 |
0.18 |
Balance |
|
Ti6242/ TC19 |
5.5- 6.5 |
1.75- 2.25 |
5.5- 6.5 |
/ |
/ |
/ |
3.5- 4.5 |
/ |
0.15 |
0.04 |
0.04 |
0.0125 |
0.15 |
Balance |
3.Mechanical properties of titanium welded tube for petroleum
|
Grade |
Tensile Strength, Min MPa |
Yield Strength Min MPa |
Elongation in 4D, Min, % |
Reduction of Area, min % |
|
Gr5 |
895 |
828 |
10 |
25 |
|
TC6 |
980 |
840 |
10 |
25 |
|
TC9 |
980 |
840 |
10 |
25 |
|
TC11 |
1060 |
910 |
9 |
25 |
|
Ti6242/TC19 |
895 |
825 |
10 |
25 |
4. Specification scope of Titanium welded tube for petroleum
|
Name |
Diameter |
Wall thickness |
Length |
Standards |
|
Titanium bar |
3-500mm |
1-20mm |
100-6000mm |
ASTM B337 ASTM B861 |
5. The development of Titanium welded tube for petroleum
Titanium welded pipe
With the continuous development of exploration and development to deep wells, ultra-deep wells, harsh and corrosive environments and deep seas, the service conditions of oil well pipes have become increasingly complex and severe, leading to the frequent occurrence of oil well pipe fracture accidents in some oil fields under high temperature, high pressure and high corrosion conditions. The safety, reliability, service life and economy of oil well pipes are extremely important to the petroleum industry. It is urgent to research and develop and promote the application of new materials and new technologies. Titanium alloy oil well pipes have become one of the key development directions in the future.
6.The advantages of titanium welded tube for petroleum
advantages
a. Titanium tubes have a low density, which can significantly reduce the load on the string, especially for ultra-deep oil well pipes.
b. Titanium tube has high strength, including: elongation strength, creep strength, fatigue strength, etc.
c. Titanium tube has excellent corrosion resistance and seawater corrosion resistance and can be used as downhole tools.
d. Titanium tube has a wide operating temperature range. The operating temperature of conventional titanium alloys is from minus 269 ℃ to minus 600 ℃.
e. Titanium tube has large elastic deformation ability, titanium alloys have high yield strength and low elastic modulus (E), so they are very suitable for parts such as springs, and more importantly for large displacement horizontal wells.
f. Titanium tube has a lower coefficient of expansion. This feature makes petroleum equipment more adaptable to changes in temperature and reduces the internal stress of structural parts.
g. Titanium tube is non-magnetic, suitable for the normal use of some detection, communication and control methods in various equipment.
h. Titanium tube has good processing performance. Titanium alloys usually have good processing properties such as casting, forging, welding, and 3D printing. This is often an important factor in the selection of various engineering materials.
7. The application of titanium welded tube for petroleum
Titanium alloy drill collars and titanium alloy tube produced with titanium bars not only have the strength of steel drill collars and tube, but also have the flexibility of synthetic materials, relatively light weight, good corrosion resistance and durability. Especially in the high stress state of drilling short-radius horizontal wells, its life is much longer than that of steel drill rods and steel drill collars.
At present, titanium alloy is widely used in the exploration and production of petroleum, natural gas and geothermal industries, mainly used in drill pipe, offshore platform bearing frame, downhole pipe, stress joint, offshore oil production, oil well maintenance support frame and offshore platform tension components, deepwater riser, kill pipeline, output riser, etc.
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