R & D and Microstructure Characterization of Ultra-high Strength-toughness Casing for Ultra-deep Well Service
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摘要: 根据超深井开发要求对超高强度高韧性套管的合金化技术和制造工艺进行研究,开发出具有优异韧性和抗延迟断裂性能的BG160V超高强度高韧性套管,并分析了该BG160V套管在不同服役温度下的强韧性以及微观组织。工业性试制的性能检测结果表明:该套管的屈服强度达到1 100 MPa以上,0℃横向夏比冲击功超过名义屈服强度的10%,满足超深井油气资源开发对套管性能的要求;管体晶粒度达到11级,平均有效晶粒尺寸2.45 μm,细小的晶粒是材料具有良好韧性和抗延迟断裂性能的主要保证。Abstract: According to the requirements of ultra-deep well development,the alloying technology and the manufact- uring process for developing the high strength-toughness casing are investiagted. As a result the ultra high strengthtoughness BG160V casing with excellent toughness and resistance against delayed fracture is developed,and the strength and micro- structure of the said casing under different service temperatures are analyzed. The results of the performance tests to the pipes as massively produced show that the yield strength of the pipe is over 1 100 MPa,and its transverse Charpy impact energy at 0 ℃ is more than 10% of the nominal yield strength,which meets the requirements of the exploitation of the ultra-deep well oil and gas;and the grain size of the casing is up to Level 11,and the average effective grain diameter is 2.45 μm,and such fine grain size is responsible for high toughness and delay fracture resistance of the material.
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Keywords:
- casing /
- St. G 160 /
- ultra high strength /
- high toughness /
- grain size /
- delayed fracture resistance
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