| Autor: |
Huang, Long Cang, Tong, Shao Kai, Cao, Yin Ping, Dou, Yi Hua |
| Zdroj: |
Applied Mechanics and Materials; September 2013, Vol. 423 Issue: 1 p1207-1210, 4p |
| Abstrakt: |
To avoid the fatigue fracture of casing inside slips, the plastic extension of casing cracks near slips under inner pressure after taking RTTS packer out should be analyzed. The plastic zone size of instability extension of two/three-dimensional cracks on casing was derived based on the theory of fracture mechanics. Analysis results show that hoop stress caused by inner pressure of casing is a key factor to lead to the instability extension of casing radial cracks after testing. The plastic extension zone size of cracks on casing near slips increases with the inner pressure or hoop stress. And, the plastic extension of cracks on casing near slips reduces the burst strength of casing significantly. The materials of casing materials and the inner pressure should be appropriately controlled to control the propagation of cracks. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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