Sealing reliability assessment of deep-water oil and nature gas pipeline connector considering thermo-mechanical coupling

Abstract

The deep-water pipeline connector (DPC) is a key piece of equipment for the connection of multiple facilities located in different positions of the subsea production system. Its sealing reliability affects the safety of the production system directly during oil and gas exploration. Although the reliability assessment methods of the DPC have been investigated, previous studies have mostly been carried out under a single mechanical field. To determine the DPC reliability considering thermo-mechanical coupling, this paper establishes random load models of working pressure and temperature by using the Gaussian function, and the stochastic finite element model of the DPC is constructed to obtain the sealing performance under coupling conditions. A Kriging–Sobol sensitivity analysis method is developed to obtain the main variables influencing the sealing performance for the purpose of decreasing the computational cost of the ordinary sensitivity analysis. A reliability assessment approach based on the cross entropy-importance sampling-Kriging method is introduced to analyze the DPC reliability, and a sealing reliability assessment method of DPC under thermo-mechanical coupling conditions is finally formed. An engineering case is taken to verify the effectiveness of the proposed method. The results show that the reliability analysis accuracy of the proposed method is almost agreed with the Monte Carlo method, but the computational cost can be reduced 85.61%, which indicates that the proposed method provides designers with a fast method with an acceptable computational cost to assess the reliability of the DPC connector under coupling conditions.

Analytical calculation method for predicting contact loads and structural strength of metallic gasket of subsea connectors under thermal loads

“…Zhang et al 4 presented an analytical model for calculating the compression deformations of the lenticular gasket and obtained the relationships among the contact load, the contact pressure, the contact width and the compression deformation. Zeng et al 20 established random load models of working pressure and temperature for a deep-water pipeline connector, and developed a sealing reliability assessment method to determine the deep-water pipeline connector reliability.…”

Log specification and intelligent analysis method based on oil and gas pipeline SCADA system

“…As the scale of domestic long-distance pipelines expands, energy security requirements are increasing while enjoying the convenience of clean energy brought to life. Energy security is an important part of the national security system, and energy security directly affects the political, economic, and social stability of a country [1][2]. Traditional oil and gas pipeline monitoring and control operations in China use long-distance telephone calls to manually request data, statistically analyze operational data, adjust operational parameters and processes, and then use long-distance telephone calls to control and manage facility operators.…”