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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

NUMERICAL SIMULATION ON THE COUPLED WATER-HEAT-STRESS FIELD OF FROZEN SOIL AROUND THE CRUDE OIL PIPELINE WITH THERMOSYPHONS

Lichao Fang
National Engineering Laboratory for Pipeline Safety, Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum, Beijing, 102249, China

Bo Yu
School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing, 102617, China

Qiyu Huang
National Engineering Laboratory for Pipeline Safety, Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum, Beijing, 102249, China

Abstract

Thermosyphons can be employed around pipeline to prevent soil thawing and thus protect the crude oil pipeline against the abrupt stress change of frozen soil around pipeline in cold regions. This paper focuses on numerical simulation of stress-heat-water field of frozen soil around the Mohe-Daqing crude oil pipeline with thermosyphons. To research the influence of thermosyphons on soil stress field, we first simulated the soil stress field, temperature field and water content field of Mohe-Daqing crude oil pipeline with and without thermosyphons respectively. For pipeline with thermosyphons, the soil stress field model and heatwater- stress three coupled fields model were compared. The influence of temperature field and moisture migration on stress field of frozen soil around Mohe-Daqing crude oil pipeline was investigated. The model was solved by the finite element method for stress field and the finite volume method with unstructured grid for temperature and water content field. In this paper, we treated heat transfer of thermosyphons in working situations as the source term adopting the additional source terms method. The soil stress change around pipeline can be reduced by installing thermosyphons by approximately 0.324MPa. The soil stress in vertical direction is larger than that in horizontal direction. Numerical results have been verified by field test data.

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