| HE Song,XING Xi-jin,LIU Shu-jie,YIN Qi-shuai,GENG Ya-nan,FENG Huan-zhi,ZHAO Qiu-xuan.Corrosion Rules of Commonly Used Oil Well Pipes in Hydrogen Sulfide Environment[J],47(12):14-20 |
| Corrosion Rules of Commonly Used Oil Well Pipes in Hydrogen Sulfide Environment |
| Received:May 11, 2018 Revised:December 20, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2018.12.003 |
| KeyWord:offshore oil and gas fields pipes corrosion protection corrosion rate uniform corrosion pitting corrosion |
| Author | Institution |
| HE Song |
1.CNOOC Research Institute Limited Liability Company, Beijing , China |
| XING Xi-jin |
1.CNOOC Research Institute Limited Liability Company, Beijing , China |
| LIU Shu-jie |
1.CNOOC Research Institute Limited Liability Company, Beijing , China |
| YIN Qi-shuai |
2.China University of Petroleum, Beijing , China |
| GENG Ya-nan |
1.CNOOC Research Institute Limited Liability Company, Beijing , China |
| FENG Huan-zhi |
1.CNOOC Research Institute Limited Liability Company, Beijing , China |
| ZHAO Qiu-xuan |
2.China University of Petroleum, Beijing , China |
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| Abstract: |
| The work aims to measure the corrosion rates of L80, N80, 1Cr, 3Cr, 9Cr and 13Cr oil well pipes under the con-ditions of hydrogen sulfide partial pressure of 0.001, 0.01, 0.1, 0.5, 1.26 and 2 MPa by the method of weight loss. The corrosion behavior of L80, N80, 1Cr, 3Cr, 9Cr, 13Cr and other materials under simulated conditions was studied by high temperature and high pressure reactor. Scanning electron microscope (SEM) was used to analyze the types and microstructure of corrosion prod-ucts. The corrosion rate of all materials was lower than 0.125 mm/a when the partial pressure of hydrogen sulfide was less than 2 MPa, so the corrosion was moderate. When the partial pressure of hydrogen sulfide was 2 MPa, the corrosion rate of all the materials except 9Cr was higher than that of severe corrosion. The corrosion rate of stainless steel was significantly lower than that of low alloy steel, and addition of a small amount of Cr element could not significantly improve the corrosion resistance. Under certain conditions, the corrosion rate was higher than that of ordinary low alloy steels. For low alloy steel and low Cr steel, the corrosion rate was not much different when the hydrogen sulfide pressure was not higher than 0.1 MPa, and the corrosion rate was basically kept near 0.025 mm/a, so the corrosion was slight. However, when the hydrogen sulfide pressure reached 0.5 MPa, the corrosion rates of L80, N80 and 1Cr increased significantly. The severity of pitting on commonly used oil well pipes gradually increased with the increase of partial pressure of hydrogen sulfide when the partial pressure of hydrogen sulfide was from 0.001~0.1 MPa. When the partial pressure of hydrogen sulfide was 0.1~0.5 MPa, the pitting degree of commonly used oil well pipes decreased with the increase of partial pressure of hydrogen sulfide. The degree of pitting gradually increased again when the partial pressure of hydrogen sulfide was from 0.5~2 MPa. For stainless steel, when hydrogen sulfide pressure is not higher than 0.1 MPa, the corrosion rate of stainless steel increases with the increase of hydrogen sulfide pressure, but the corrosion rate remains at a low level. When the hydrogen sulfide pressure reaches 0.5 MPa, the corrosion rate of stainless steel increases significantly. The corrosion resistance of stainless steel is much better than that of low alloy steel, especially in the environment of low hydrogen sulfide pressure. |
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