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PIPE-LAYING TECHNOLOGY IN A SUBARCTIC PERMAFROST REGION — A CASE STUDY FOR THE CHINA-RUSSIA CRUDE OIL PIPELINE FROM MO'HE TO DAQING, NORTHERN NORTHEAST CHINA
Session: Permafrost Considerations in Design / Pergélisol et conception en milieu nordique
Yongping Wang, State Key Laboratory of Frozen Soils Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences (China)
Huijun Jin, State Key Laboratory of Frozen Soils Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences (China)
Jiaqian Hao, State Key Laboratory of Frozen Soils Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences (China)
Guoyu Li, State Key Laboratory of Frozen Soils Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences (China)
Yongjun Cai, PetroChina Pipeline Company (China)
Shusheng He, PetroChina Pipeline Company (China)
This paper summarized some pipe-laying technology experiences and lessons of the China-Russia Crude Oil Pipeline (CRCOP). The main principle on frost hazards mitigation and pipeline route selection is "bypassing" and "protection" of permafrost with mitigative measures. Another supplementary principle is pre-thawing or clearance of permafrost. The mitigative measures mainly include the increase of pipe wall thickness, external thermal insulation, drainage control, re-vegetation, and refilling with the thaw-stable (or non-frost-susceptible) soils. Numerical simulations, field investigations and ground-penetrating radar surveys have provided many key parameters and characteristics of the pipeline and its foundation soils. A strain-based pipeline design and a modified conventional burial were proposed and adopted for the CRCOP.
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