AHP comprehensive fuzzy evaluation on sea trials of subsea christmas tree

Subsea christmas tree is the core equipment of subsea production system, and its performance and safety has a direct effect on the efficiency and safety of the overall subsea oil and gas production. Based on the studies on the sea test process of subsea christmas tree, combined with the structures and functions of subsea christmas tree, the sea-test evaluation index system for subsea christmas tree was constructed from the aspects of transportation lifting, installation recovery, functionality and ROV operability by means of analytical hierarchy process (AHP). Then, the comparative judgment matrix corresponding to each index was established by virtue of pairwise comparison method and scaling procedure, and the weight vector of each index was calculated. Finally, the evaluation indexes of subsea christmas tree system were quantitatively analyzed by means of the comprehensive fuzzy analysis method, so as to figure out its overall performance and individual performance and evaluate the subsea christmas tree quantitatively. The research results provide the guidance for the acquisition of sea test data of subsea christmas tree and the quantitative evaluation on the performance of subsea christmas tree, and the evaluation results can be used as the reference and basis for the improvement of subsea christmas tress after sea test.