This paper describes a system for monitoring the maximum stresses in an intervention wellhead, BOP lubricator/riser, and injector structure. In some offshore cases the wellhead itself may be moving, causing stresses in the intervention structure. In other cases the injector support system may allow some side-to-side movement, causing stresses in the structure. This system measures the bending moment, bending direction, axial load and internal pressure at one or more points in the structure. A real-time finite element analysis is then performed by the system to determine the maximum stress in the structure. The system displays the bending moment, bending direction, axial force, and internal pressure to the operator. It also displays the maximum stresses along the length of the structure, and warns the operator when the stresses exceed a safety limit. This paper describes the development and testing of this system.

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