PSI - Issue 22

Yihua Dou et al. / Procedia Structural Integrity 22 (2019) 33–42 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

37 5

° phase angle, and the common perforations density of 8, 12,16 and 20 holes/perforated casing samples are formed through shoot perforated hole with perforations diameter of 8 ~ 13mm.

Fig. 3 sample perforated casing Table 1 perforated casing geometry and perforating parameters of sample Sample No. casing diameter/mm thickness/mm hole diameter/mm

perforations density hole/m

phase/ º

TG1 TG2 TG3

145.90 141.82 141.82

8.91 8.84 9.12

11.92

20

60 90 60

8.27

8 8

10.47

Table 2 sample perforated casing strain gauge patch distance /mm measuring position TG1

TG2

TG3

axial 18.30

circumferential

axial

circumferential

axial

circumferential

The distance from the nearest piece to the hole edge

19.70

10 10

10 10

10 10

10 10

spacing

10

10

2.3. Experimenting process As shown in Fig. 4, the experiment was carried out on the full-size casing test machine. Refer to the relevant provisions of API RP5C5, the load test is conducted step by step with the step length of 30kN.Sample TG1 fails and breaks when the load is added to 2529.2kN, sample TG2 fails when the load is added to 2654.7kN, and sample TG3 fails when the load is added to 2390.9kN.