关键词：
Degradation
Failure modeling
Oil
Pipeline
Thermoplastic Composite
Gas
Reinforced thermoplastic pipe
摘要：
The use of composite pipelines has grown in recent years as an alternative to steel in the oil and gas industry, due to their excellent corrosion resistance and high specific strength. Among these developments, thermoplastic composite pipes have seen a recent rise in research and use due to their greater flexibility and impact resistance than traditional thermoset-matrix composites. To understand and predict the performance of these materials in the field, studies have derived experimental, analytical, and theoretical estimates of the mechanical and thermal properties of thermoplastic composite pipes (TCP) and reinforced thermoplastic pipe (RTP) in dry conditions, but studies in wet or corrosive environments are currently restricted to the empirical domain. A better understanding of the performance of thermoplastic-matrix composites in marine and water-saturated environments is needed, because 30% of the world’s current oil and gas supply is produced offshore; the offshore portion of the upstream segment of the oil and gas industry has risen dramatically in recent years, and this trend is expected to continue. To address part of this gap in modeling capability, this research used a probabilistic approach to predict degradation rates of the constituent polymer matrix and reinforcement fibers within an individual composite ply given the local temperature and the amounts of absorbed fluids. This method was applied by developing a TCP simulation code, which consists of three major time-dependent processes: 1) absorption of oil- and water-based fluids for each layer of the pipe given spatial and temporal variations in the diffusivity parameters, 2) evaluation of the local composite properties given the amount of degradation to the matrix and fibers during each time window, and 3) prediction of the stresses at each ply under defined thermomechanical loading conditions given the current state of each ply’s mechanical properties and subsequent determination of ply failures.
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