On the development of a three-dimensional model for a coiled-tubing/riser system

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On the development of a three-dimensional model for a coiled-tubing/riser system

Adnan, S. / Zheng, A.S. / Chen, Y.

The use of coiled tubing (CT) to conduct well intervention services is well established. With improving technology, the use of CT has continued to grow at an average rate of ten percent per year, even as other services decline. With increasing use of coiled tubing in tall risers in the field, an analysis model to determine the response of the riser stack is beneficial to field engineers. This paper establishes the governing ordinary differential equation (ODE) for a tubing/riser system subjected to external loadings. Effects such as mud weights, internal pressure in the tubing and annulus, and cable forces are all included in the model. A numerical scheme based on the principal of shooting is employed in the search of numerical solution for the ODE. Results from this algorithm are compared to those obtained from commercial finite element program to verify the validity of the mathematical model and accuracy of the numerical algorithm. The paper consists of three parts: model development, numerical algorithm, and numerical verifications. Model development provides a mathematical description of the physical system using an ODE. Numerical algorithm establishes a scheme for solving the ODE. Numerical verifications provide results comparisons between our algorithm and ABAQUS.