The typical structure of a flexible pipe end fitting is shown in Figure 1. To achieve good connection, a special epoxy resin casting method is generally adopted when forming the end connection, and the wedge ring contact method is used to achieve sealing. As a key component, the end fitting must not only achieve a reliable connection with the armor layers but also good internal and external sealing. This type of flexible pipe consists of four key components: metal interlocking carcass layers, metal armor layers, inner and outer sheath layers and an end fitting. The type of high-performance composite flexible pipe most commonly used in deep water is a metal-armored unbonded flexible pipe. Based on these results, the existing end fitting resin cavity structure and pouring process were optimized, and better pouring quality was obtained. In addition, based on the simulation results obtained, some local pouring simulations were conducted for the armor steel wire, the key characteristic structure of the end fitting resin cavity that has a significant influence on the pouring quality, to investigate the influence of the geometrical characteristics of the armor steel wire on the pouring quality. The distribution and evolution of defects were studied, and the influence of pouring rate and fluid viscosity on pouring quality was analyzed.

In this paper, numerical methods were employed to investigate the pouring process of the resin cavity. The pouring quality of epoxy resin in the resin cavity of deep-water composite flexible pipe end fittings has a decisive effect on the performance of the end fitting, and accurate investigation of the resin flow during the pouring process can provide a reference for optimization of the pouring process so that the pouring quality can be improved.

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