Fatigue calculation method and system for shallow water underwater wellhead connector

• Main Authors: HU YANGDONG, LIN ZEQING, SUN HAIBO, LI YUFANG, WANG YINGYING, HAN JUNJIE, TONG WUJUN, WANG BAOFU, JU SHAODONG, LI XINGYE, JIN RULONG
• Format: Patent
• Language: Chinese; English
• Published: 20.08.2024
• Subjects: CALCULATING; COMPUTING; COUNTING; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; ELECTRIC DIGITAL DATA PROCESSING; FIXED CONSTRUCTIONS; IMAGE DATA PROCESSING OR GENERATION, IN GENERAL; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PHYSICS

The invention relates to a fatigue calculation method and system for a shallow water underwater wellhead connector, and the method comprises the steps: building a platform-marine riser-blowout preventer group-Christmas tree-underwater wellhead and conduit global coupling model according to environmental parameters; shear force and bending moment time travel curves under different working conditions are obtained; obtaining a load spectrum of a load cycle amplitude and a load cycle number based on the time history curve; constructing an underwater wellhead connector refined model according to the structural forms of the underwater wellhead and the Christmas tree body; obtaining a load-stress curve of a fatigue check point by combining different wind wave and flow working conditions with the refined model of the underwater wellhead connector; selecting and calculating an S-N curve of a key component of the underwater wellhead connector by referring to a DNV standard; and calculating the annual fatigue damage and