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Wang T.,China University of Mining and Technology | Xu D.,China University of Mining and Technology | Wu Z.,State Administration of Work Safety | Tong S.,China Academy of Safety Science and Technology
Materials Performance | Year: 2016

A rough sets-based approach is presented to determine the weight of soil corrosion parameters based on their intensity and significance. The approach separates measured data based on the classification of attributes and establishes a decision table that includes the universe, the condition attributes set, and the decision attributes set. Application to a test case demonstrates this approach to be scientific, objective, applicable, and superior to other methods. Source


Liu S.-G.,China University of Mining and Technology | Zhang X.-L.,State Administration of Work Safety | Yuan W.-F.,China University of Mining and Technology | Tian X.-Y.,China University of Mining and Technology
Meitan Xuebao/Journal of the China Coal Society | Year: 2012

In order to reduce the harm of coal powder to the reservoir in coalbed methane (CBM) well drainage, the regularity of coal powder production and the effect to drainage were analyzed. Based on the monitoring data of CBM well, such as coal powder concentration, gas production, water production, the dynamic regularity of coal powder concentration were summarized, the effect of numerous coal powder on the equipment and reservoir seepage channel during the early period of CBM desorption, was research, the limited coal powder concentration control method to improve the production equipment carrying powder capacity, increase coal powder production was presented. The field application results demonstrate the limited coal powder concentration control method can reduce damage of the coal powder to reservoir seepage channel, extend the pump inspection cycle, and release gas productivity of CBM well. Source


Tong S.,China Academy of Safety Science and Technology | Wu Z.,State Administration of Work Safety | Wang R.,China Academy of Safety Science and Technology | Duo Y.,China Academy of Safety Science and Technology
Lecture Notes in Electrical Engineering | Year: 2016

Accidents such as leakage, fire, and explosion have happened occasionally in the long-distance oil and gas pipelines engineering in these years. Those accidents have caused large casualties, wealth loss, and environment pollution. So it is necessary to study the risk of the pipeline engineering in order to better avoid accidents and minimize losses of the long-distance oil and gas pipelines engineering. Based on the system safety theory, experts’ advices, and survey data, a comprehensive risk analysis and assessment of oil and gas pipeline engineering was carried out in this paper. From humans, materials, environment, and management four aspects, 32 risk factors were identified and assessed by combining the possibility with the severity of those identified risks. The risk level of the oil and gas pipelines was divided into five degrades from low to high. The proposed method was then applied to a natural gas pipeline engineering to identify and assess the risk of each pipe of the selected long-distance natural gas pipeline engineering. As a result, the earthquakes, avalanches, tunnel construction, and third party liability were the higher risk factors, and the risk of the forth pipe was the highest and should strengthen the risk management. Finally, some suggestions were proposed to the safety and risk management of the oil and gas pipelines engineering. The risk assessment method was thus proved to be a powerful tool to the risk decision-making and management of the long-distance oil and gas pipelines. © Springer-Verlag Berlin Heidelberg 2016. Source


Liu S.-G.,China University of Mining and Technology | Yuan W.-F.,China University of Mining and Technology | Zhang X.-L.,State Administration of Work Safety | Chen H.,China University of Mining and Technology
Meitan Xuebao/Journal of the China Coal Society | Year: 2013

Theoretical analysis and numerical simulation method were applied to demonstrate the gas production curve characteristics in of Coalbed Methane(CBM) Well in Panzhuang block. The CBM reserves parameter such as gas content, permeability, reservoir pressure were analyzed. The gas production curve was controlled by the high abundance of resources, high reservoir pressure and high permeability are summarized. Results indicate: (1) the gas peak appears early, and have long duration characteristic; (2) gas recovery rate higher than the reserves report of Panzhuang block, recovery rate of straight well can reach 59%, and recovery rate of horizontal well can reach 67%. Significantly higher than recovery rate of 55% in PanZhuang block reserves report. Source


Shen X.-W.,Hunan University | Zeng F.-Z.,Hunan University | Zhou M.,State Administration of Work Safety
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2013

Under correlated log-normal shadow fading channel, the correlation between sensors affect the performance of the cooperative spectrum sensing. Although collaborative spectrum sensing could improve the detection performance as the number of collaborative sensors increased, but the gain of newly added collaborative sensor decreased and the system resources usage efficiency decreased. Therefore, in order to get a good trade-off between sensing reliability and system resources usage efficiency, a new algorithm was proposed to select the effective sensors for collaborative spectrum sensing under correlated log-normal shadowing. The simulation results show validity and reliability of the algorithm. © Copyright;. Source

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