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A method for pier thickening of high-strength and toughness titanium alloy drill pipe material
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A high-strength and toughness, titanium alloy technology, used in metal processing equipment, heating/cooling equipment, manufacturing tools, etc., can solve the problems of difficult development and processing technology, difficult processing and forming, and difficult deformation of titanium alloy tubes.
Active Publication Date: 2019-05-28
TIANJIN STEEL PIPE MFG CO LTD
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Problems solved by technology
For example, common high-strength titanium alloys, such as TC4 and Ti6246, have the advantages of high strength and good corrosion resistance, but their low toughness hinders their application in drill pipes.
On the other hand, because titanium alloy has the characteristics of high temperature resistance, high strength, difficult deformation, and extremely difficult processing and forming, the development and processing technology of titanium alloy tubes is difficult, especially the thickening process is fast and difficult to deform.
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Embodiment 1
[0014] Apply glass powder: the thickness of the application is controlled at about 1 mm, and the end time of application is controlled at 1 hour before the next step;
[0015] Induction heating: heating temperature 990°C, heating time 5min;
[0016] One-time pier thickening: thickening and shortening amount is 130mm;
[0017] Secondary heating: heating temperature 920°C, heating time 5min;
[0018] Secondary pier thickness: thickening and shortening amount is 75mm;
[0019] Heat treatment: the pipe after the second pier is annealed at a temperature of 950°C and a holding time of 60 minutes;
[0020] The titanium alloy tube that this embodiment obtains can reach following index:
[0023] Apply glass powder: the thickness of the application is controlled at about 2 mm, and the end time of application is controlled at 1.5 hours before the next step;
[0024] Induction heating: heating temperature 970°C, heating time 5min;
[0025] One-time pier thickening: thickening and shortening amount is 110mm;
[0026] Secondary heating: heating temperature 900°C, heating time 5min;
[0027] Secondary pier thickness: thickening and shortening amount is 60mm;
[0028] Heat treatment: the pipe after the second pier is annealed at a temperature of 900°C and a holding time of 60 minutes;
[0029] The titanium alloy tube that this embodiment obtains can reach following index:
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Abstract
The invention discloses a method for heading a high-strength toughness titanium alloy drill rod material. A titanium alloy drill rod is composed of, by weight, 5-7 parts of Al, 2.0-3.0 parts of Nb, 0.5-2.0 parts of Zr, 0.7-1.2 parts of Mo, 0.02-0.05 part of Fe, 0.01-0.03 part of Si and the balance being Ti. The method for heading the drill rod material composed of the compositions includes the steps that 1, smearing of glass powder is performed; 2, induction heating is performed; 3, primary heading is performed; 4, secondary heating is performed; 5, secondary heating is performed; 6, heat treatment is performed on integral pipes. The method has the advantages that after the titanium alloy drill rod material is headed, and the requirements for 110 ksi drill rod products of API standards are met, wherein mechanical properties are that the yield strength is larger than 758 Mpa, impact toughness is larger than 41 J, and the elongation rate is larger than 11%; the titanium alloy drill rod material can be used in a strict corroding environment that H2S partial pressure is 5 Mpa, CO2 partial pressure is 11 Mpa, the concentration of NaCl is 100000 ppmCl, and the native sulfur is 3 g / L. The showed capacity of resistance to hydrogen sulfide stress corrosion is far higher than that of a common API drill rod, and the titanium alloy drill rod material is the optimal material replacing carbon steel in exploitation and application of oil and gas, and meets the requirements of oil fields corroding the environment.
Description
technical field [0001] The invention relates to the application of drill pipe materials for drilling, in particular to a pier thickening method for high-strength and toughness titanium alloy drill pipe materials. Background technique [0002] Many oil and gas fields in the world are sour oil and gas fields, which are highly corrosive, and hydrogen sulfide is an important corrosive medium. Ordinary API drill pipe can only be used in oil and gas well pipes that do not contain corrosive media, or in oil and gas wells that contain slightly corrosive media, and are not suitable for use in oil and gas wells that contain mixed solutions such as H2S and salts. Therefore, the development and research of high-performance drill pipes resistant to hydrogen sulfide corrosion has become an important research topic. At present, most of the materials used in international and domestic drill pipes are carbon steel pipes. As the depth of oil well exploitation continues to increase, the geolo...
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Application Information
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