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In this paper, the causes for drillstring failure encountered during drilling practice in northeast Sichuan region (China) are systematically investigated based on more than 130 failure cases. The fault tree of drillstring failure in northeast Sichuan (China) is then constructed with considering the drillstring failure as the top event of the fault tree. The minimal cut sets and the minimal path sets...
For the ecological environment and bio-diversity protection at Jiansanjiang area, China, thesis adopted multi-scale remote sensing image segmentation method to detect an ecological corridor between two national nature reserves Sanjiang(SJNR) and Honghe(HHNR). The width of this corridor was detected by calculating the division threshold value of NDVI standardized change intensity index. And the structure...
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