PSI - Issue 22

Yinping Cao et al. / Procedia Structural Integrity 22 (2019) 84–92 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

89

6

Fig 4 Three-dimensional view of the casing

Table 2 Comparison of theoretical and numerical solutions of collapse strength of casing with OD of 139.7mm and thickness of 10.54 mm in different wellbore curvatures Wellbore curvature （ °/30 m ） Wall thickness 10.54 mm Theoretical Solution /MPa Numerical Solution /MPa Error /% 2 104.74 104.90 0.15% 4 103.71 104.32 0.58% 6 102.65 103.76 1.07% 8 101.56 103.15 1.54% 10 100.44 102.55 2.06% 12 99.30 101.95 2.60%

Table 3 Comparison of theoretical and numerical solutions of collapse strength of casing with OD of 139.7 mm and thickness of 12.70 mm in different wellbore curvatures

Wall thickness 12.7 mm

Wellbore curvature （ °/30 m ）

Theoretical Solution /MPa

Numerical Solution /MPa

Error /%

2 4 6 8

124.14 122.96 121.76 120.52 119.25 117.94

124.86 123.34

0.58% 0.31% -2.26% -1.92% -1.69% -2.21%

119

118.2

10 12

117.23 115.33

Table 4 Comparison of theoretical and numerical solutions of collapse strength of casing with OD of 114.3 mm and thickness of 8.56 mm in different wellbore curvatures Wellbore curvature （ °/30 m ） Wall thickness 8.56 mm Theoretical Solution /MPa Numerical Solution /MPa Error /% 2 132.86 131.00 -1.40 4 132.01 129.67 -1.77 6 131.11 129.62 -1.14 8 130.30 129.56 -0.57 10 129.42 129.30 -0.09 12 128.31 129.00 0.54