The effects of sulfide stress cracking on the mechanical properties and intergranular cracking of PllO casing steel in sour environments

Variation and degradation of P-110 casing steel mechanical properties, due to sulfide stress cracking （SSC） in sour environments, was investigated using tensile and impact tests. These tests were carried out on specimens, which were pretreated under the following conditions for 168 hours： temperatur...

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Bibliographic Details
Published in:石油科学：英文版 2013 (3), p.385-394
Main Author: Hou Duo Zeng Dezhi Shi Taihe Zhang Zhi Deng Wenliang
Format: Article
Language:English
Subjects:
力学性能
应力开裂
拉伸强度
晶间裂纹
硫化物
管钢
酸性环境
预紧压力
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Summary:Variation and degradation of P-110 casing steel mechanical properties, due to sulfide stress cracking （SSC） in sour environments, was investigated using tensile and impact tests. These tests were carried out on specimens, which were pretreated under the following conditions for 168 hours： temperature, 60 ℃; pressure, 10 MPa; H2S partial pressure, 1 MPa and CO2 partial pressure, 1 MPa; preload stress, 80% of the yield strength （os）; medium, simulated formation water. The reduction in tensile and impact strengths for P-110 casing specimens in corrosive environments were 28% and 54%, respectively. The surface morphology analysis indicated that surface damage and uniform plastic deformation occurred as a result of strain aging. Impact toughness of the casing decreased significantly and intergranular cracking occurred when specimens were maintained at a high stress level of 85% %.
ISSN:1672-5107
1995-8226