The Anti-Hydrogen Cracking of Seamless Tube Material
The seamless pipe line is mainly used for pumping high pressure oil and gas near the wellhead. As the corrosion problem of hydrogen sulfide is becoming more and more serious, the development of anti-sulfur seamless pipeline tube is urgent, and the anti-sulfur performance is the key. Discusses the influence of hydrogen induced crack (HIC) resistance of medium and material factors, Cu, Ni join can improve the performance of seamless line pipe material HTC reduce the S content in the steel, by spraying calcium silicon powder also can reduce the sensitivity of hydrogen bubble.
With the development of oil and gas exploration, the problem of hydrogen sulphide corrosion is very acute because of the increasing amount of oil and gas Wells in the complex and sulfur environment. In recent years, there has been an increase in demand for the seamless pipe line. The seamless pipeline pipe is mainly used for pumping high pressure oil and gas near the wellhead, and it is made by seamless tube production. This paper intends to discuss the development of the seamless pipeline tube.
1 test method
In the lab according to the ISO3183 standard, using the method of immersion, smelting furnace 1 t steel ingot, after forging, perforation, pipe jacking and decrease manufacturing into tube, on the steel pipe intercept 20 mm x 100 mm x 5 mm thickness or pipe thick specimen, immerse the stipulated in the standard configuration in the solution, take out after 96 h and vertical mill to take section, using metallographic method to calculate the three parameters (crack length ratio CLR, crack thickness ratio CSR CTR, crack sensitive rate), in order to compare the resistance to hydrogen induced crack (HIC) sensitivity.
Factors affecting the performance of the HIC
2.1 factor
1) pH value. A large number of studies have shown that the sensitivity of the hydrogen bubbles decreases with pH in the range of 1 ~ 6, and when the pH > 6 is not occurring, the hydrogen bubble will not be bubbling
2)H2S concentration. The higher the concentration of hydrogen sulfide, the greater the sensitivity of the hydrogen bubble.
3) chloride ions. In a range of 3.5 to 4.5, the presence of cl-is increasing the rate of corrosion, and the sensitivity of hydrogen bubbles increases.
4) temperature. 25 ℃ when the CLR, the sensitivity of the hydrogen bubble is the largest. Below 25 ℃, the temperature and the corrosion reaction of hydrogen diffusion speed, increased sensitivity to hydrogen bubble. After the above 25 ℃, due to the concentration of H2S, but decreased the sensitivity of the hydrogen bubble.
5) time. Compared with 96 h, the degree of corrosion tends to be severe as the test time increases.
With the development of oil and gas exploration, the problem of hydrogen sulphide corrosion is very acute because of the increasing amount of oil and gas Wells in the complex and sulfur environment. In recent years, there has been an increase in demand for the seamless pipe line. The seamless pipeline pipe is mainly used for pumping high pressure oil and gas near the wellhead, and it is made by seamless tube production. This paper intends to discuss the development of the seamless pipeline tube.
1 test method
In the lab according to the ISO3183 standard, using the method of immersion, smelting furnace 1 t steel ingot, after forging, perforation, pipe jacking and decrease manufacturing into tube, on the steel pipe intercept 20 mm x 100 mm x 5 mm thickness or pipe thick specimen, immerse the stipulated in the standard configuration in the solution, take out after 96 h and vertical mill to take section, using metallographic method to calculate the three parameters (crack length ratio CLR, crack thickness ratio CSR CTR, crack sensitive rate), in order to compare the resistance to hydrogen induced crack (HIC) sensitivity.
Factors affecting the performance of the HIC
2.1 factor
1) pH value. A large number of studies have shown that the sensitivity of the hydrogen bubbles decreases with pH in the range of 1 ~ 6, and when the pH > 6 is not occurring, the hydrogen bubble will not be bubbling
2)H2S concentration. The higher the concentration of hydrogen sulfide, the greater the sensitivity of the hydrogen bubble.
3) chloride ions. In a range of 3.5 to 4.5, the presence of cl-is increasing the rate of corrosion, and the sensitivity of hydrogen bubbles increases.
4) temperature. 25 ℃ when the CLR, the sensitivity of the hydrogen bubble is the largest. Below 25 ℃, the temperature and the corrosion reaction of hydrogen diffusion speed, increased sensitivity to hydrogen bubble. After the above 25 ℃, due to the concentration of H2S, but decreased the sensitivity of the hydrogen bubble.
5) time. Compared with 96 h, the degree of corrosion tends to be severe as the test time increases.
评论
发表评论