Abstract
This paper presents a spatial model of riser dynamics formulated using the segment method and its applications. The model has been validated by comparison of the authors’ own results with those obtained from experimental measurements and Abaqus on the basis of forced vibration with large amplitude for the riser submerged in water. The influence of the sea environment is considered. Correctness and numerical effectiveness of the model enable us to formulate and solve the force stabilisation problem. A dynamic optimisation problem is formulated and solved. As a result vertical courses of movement of the upper end of the riser are obtained which compensate the horizontal movement of the base and stabilise the force in the connection of the riser with a wellhead.
Highlights
Deep sea drilling for hydrocarbons requires the use of very sophisticated technical equipment
The reason is that when the riser is almost vertical forces acting at point E, when the upper end of the riser move about 14 m in x, z directions in a relatively short time, lead to a large increase in longitudinal forces
The paper presents a different formulation of the finite segment method which uses absolute angles in contrast to the classical finite segment method, in which relative angles are used in order to describe the geometry of a slender system
Summary
Deep sea drilling for hydrocarbons requires the use of very sophisticated technical equipment. Complex computational methods are used in the design phase of offshore devices. Calculation of statics and dynamics of risers is an important element of this process and is. For modelling such structures as risers, the finite element method is used most often [2], which is reflected in many software packages like ANSYS, Abaqus or Riflex. Many other methods are used: finite difference method [3], lumped-mass method [4,5,6], finite segment method [7,8,9,10], or the similar rigid finite element method [11,12,13,14,15,16]. Most of the methods mentioned use Morison equations in order to describe the influence of the sea
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
