The effects of sulfide stress cracking on the mechanical properties and intergranular cracking of P110 casing steel in sour environments  

作　　者：Hou Duo Zeng Dezhi Shi Taihe Zhang Zhi Deng Wenliang 

机构地区：[1]State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University

出　　处：《Petroleum Science》2013年第3期385-394,共10页石油科学（英文版）

基　　金：support of the State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University in China;the National Natural Science Foundation of China (Grant No.51004084)

摘　　要：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% %.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% %.

关 键 词：Acidic solutions high-temperature corrosion hydrogen embrittlement intergranular corrosion sulfide stress cracking 

分 类 号：TE988.2[石油与天然气工程—石油机械设备] TG172[金属学及工艺—金属表面处理]