Research Progress Of Titanium Alloy Oil Well Pipe At Home And Abroad

In the mid-1980s, the United States and Japan began to study the applicability of titanium alloy materialsin the field of oil and gas development. The RMI Titanium Company system since the 1990 s can be used in the oil and gas development is studied in the field of types and performance of Titanium alloy is verified by the experimental method of different Titanium alloy materials used in high temperature and high pressure, high corrosion environment feasibility and performance of the limit, the hydrogen embrittlement of prevention measures and precious metals platinum group elements on corrosion resistance of Titanium alloy, The rolling process of hot rotating and pressure perforated pipe has been successfully developed, and titanium alloy oil bushing, continuous pipe, offshore drilling riser and catena riser with steel grade over 1000 MPa have been developed.

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According to NACE assessment of American Society of Corrosion Engineers, the product can completely resist H2S, CO2 and Cl-corrosion when the ambient temperature is below 330 ℃. Since 1999, the product has been successfully applied to oil and gas Wells in several blocks in the United States, Oryx Neptune Drilling Project in the Gulf of Mexico and Mobile Bay Field thermal acid oil and gas Wells.

Weatherford subsidiary Grant Prideco and RTI Energy Systems used a hot rolling process to develop a titanium alloy drill pipe that not only has the strength of the steel drill pipe, but also has the flexibility, light weight, corrosion resistance and durability of the synthetic material. The product was drilled in a number of short-radius horizontal Wells in Kansas in 1999.

Unocal used titanium pipes for the development of hot brine geothermal production Wells in The Salton Sea area in the United States. Working in a corrosive environment with ultra-high concentration of brine at 290 ℃, the life of carbon steel pipes is generally shorter than one year, while the design life of titanium alloy pipes is expected to be longer than 15 years.

Ti-6al-2sn-4zr-6mo, TI-6al-4V, Ti-6al-4V-Ru, ti3al-8V-6CR-4ZR-4MO and other titanium alloy casing materials developed by Chevron have been used in some high pressure, high temperature, ultra-high pressure and high temperature Wells in the Gulf of Mexico. Continental Petroleum Corporation used titanium drilling risers with diameters of about 508 mm in Hiedrun TLP, and Cooper-Cameron Petroleum Tools Co., Ltd. used TI-6al-4V ELI Alloy extrusion to produce risers with diameters of 295 mm and 346 mm and put them into the Greencanyon Project. The whole installation has been in operation since May 1995.

Quest Integrity NZL Ltd of New Zealand has studied the corrosion of titanium alloy in geothermal resources development. The results show that titanium alloy has good performance in geothermal fluid at 25 ~ 165 ℃. Sumitomo Metal and other companies in Japan have studied the corrosion behavior of titanium alloy pipes under simulated production conditions, which proves that titanium alloy material has great advantages in the field of oil and gas development.