With the increasing exploration and development of offshore oil and gas fields in deeper waters,sloping seabeds are commonly encountered,posing higher requirements for the installation and transfer of lazy wave risers.Based on the principles of virtual work and minimum potential energy,a mechanical analysis model of lazy wave risers is established.Using this model,a parameter analysis of the transfer process of lazy wave risers under non-flat seabed conditions is conducted,investigating the effects of parameters such as seabed slope angle,installation vessel tension,float section length,and horizontal distance between vessel and platform on the transfer process.The study reveals that as the seabed slope angle increases,the bending curvature of the riser during the transfer process intensifies,causing the upper arch point and lower sag point to move upward,while the tension at the suspension point and maximum shear force decrease.Under non-flat seabed conditions,the turning points and trends of the changes in tension at the upper arch point,lower sag point,and suspension point vary with changes in influencing parameters.These findings provide valuable insights for the design and application of lazy wave risers in non-flat seabed marine environments.
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