The Grade Choice of Titanium And Titanium Alloy Used In Petroleum And Natural Gas Exploitation

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In response to the severe well condition with high sulfer content, Nickel-based alloy tubing is currently mostly used, But for the high density of Nickel-based alloy tubing, the safty factor of deep well pipe column is not rich. And it requires higher strength in the ultra deep well. Titanium allloy has become a new choice of the pipeline material, because of its higher corrosion resistance performance, And the density of titanium is only half percent of that of nickel-based alloy.

 

In this few years, a variety of titanium and titanium alloy have been selected for analysis and testing the production of tubing in order to provide new options for deep and ultra-deep wells solutions. The selection of titanium alloy tube, pure titanium and titanium alloy in oil and gas exploitation and production are shown in the following table.



Material

The Lowest Yield Strength/MPa

Application

Industrial Pure Titanium(TA1)

140

plate heat exchanger;

Industrial Pure Titanium(TA2)

275

tubular heat exchanger;  seawater pipeline;

Ti-0.3Mo-0.8Ni(TA10)

345

tubular heat exchanger; ground pipeline; vertical pipe; transmission pipeline;

Ti-3Al-2.5V(TA18)

485

ground pipeline; structure on the drilling tool; vertical pipeline, transmission pipeline;

Ti-6Al-4V Eli

760

Drilling Well Vertical Pipe; Oil extraction and output vertical pipes; fastener

Ti-6Al-4V(TC4)

827


Ti-6Al-4V-0.05Pd(TC22)

827


Ti-6Al-2Si-4Zr-6Mo(TC19)

965

conical stress connectors; Oil extraction and output vertical pipes;