Monitoring Technology in Permafrost and Geotechnical Regions of MoHe-DaQing Pipeline

摘要

MoDa pipeline is constructed from Mohe to Daqing since 2009, with 933 km length and 32 inch diameter. This Pipeline is operated by Petrochina Pipeline Company. It is the first completely buried oil pipeline constructed within the continuous and discontinuous permafrost zone of China where the average temperature in winter is about -30°C. This pipeline will transport roughly 300 thousands barrels of crude oil per day to northern markets of China from January 1st, 2011. It's a significant cooperation for both Russia and China. This paper will review the design, construction, and operational challenges of this pipeline. Analyses the happen possibility of frost heave/thaw settlement and slope instabilities in specific areas. Although traditional methods already were careful coincided, such as minimize thermal disturbance to the soil during construction, insulating permafrost slopes to minimize post-construction thaw, accommodating ground movement, and evaluating the effects of moving water bodies adjacent to the pipeline right-of-way, monitoring technology is still significant methods which include using thermostats sensors to monitor soil temperatures, using Brag liber sensors to monitor material strain, using special displacement instrument to monitor frost heave and thaw settlement, Of course, the use of in-line inspection tools will be valuable as a supplement to conventional geotechnical monitoring. According to these monitoring technical and data been selected, The relationship between pipe and soil have been made out for specific sites in order to assess the potential for frost heave thaw settlement and slope movement, and also include if this generated strains in the buried pipeline exceed the strain capacity. All these consequence will be significant for the integrity management of this pipeline. In the end of this paper, several suggestions will be given to guidance next management work.