Table 1
Strength criteria of operability envelopes for parallel strings (DNV-OS-F201, 2010).
Limiting factors | Restrictive conditions |
---|---|
The maximum equivalent stress of the riser/yield strength | 0.80 |
The maximum equivalent stress of the string/yield strength | 0.67 |
Maximum bending moment of wellhead/yield strength | 0.80 |
The maximum deflection angle of the string | 2° |
The maximum deflection angle of the riser | 9° |