Titanium and titanium alloys have very good stability in organic compounds, except for five organic acids (formic acid, acetic acid, oxalic acid, trichloroacetic acid and trifluoroacetic acid) at higher temperatures. Therefore, titanium is an excellent structural material in petroleum refining and petrochemical industry, and can be used to make various reactors, pressure vessels, heat exchangers, separator piping, distillation tower top condenser linings, etc.
In oil and gas drilling and production, the UK used titanium drilling and production equipment in a 600m deep, 262°C containing 5% H2S and 25% NaCl. The former Soviet Union adopted titanium pumps, titanium valves and medical titanium plate flushing brine equipment. In order to solve the corrosion of 600-700atm high-temperature H2S, C02 and water vapor at the wellhead of natural gas in my country, Ti-6Al-4V valve plate, valve seat and valve stem are used, and the long-term use effect is very good.
Offshore oil and gas production must endure seawater corrosion and stress corrosion for a long time. Ti-6Al-4V is widely used abroad as oil platform pillars, rope supports, high-pressure pumps, risers and couplings of seawater circulation pressurization systems. Because Ti-6A1-4V is not only resistant to seawater corrosion, but also has high toughness, high yield strength and high fatigue limit. Recently, titanium prestressed oil production pipe joints are selected abroad. This joint is easy to assemble, light in weight, and maintains elastic sealing. Titanium is the best preferred material. my country's offshore oil industry is entering a stage of large-scale development. Currently, the structural parts, key components and equipment of the platform are all imported from abroad, and domestic materials are rarely used. But it can be expected that titanium will find a broad market here.
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