基于量纲分析理论,提出地震作用下环行吊车缩尺模型动力响应的相似准则,确定核环吊原型和实验模型之间动力响应的相似关系。根据抗震规范要求和相似准则,采用El Centro 1979地震波作为实验台地震输入,对振动台震动输入进行调幅处理,水...基于量纲分析理论,提出地震作用下环行吊车缩尺模型动力响应的相似准则,确定核环吊原型和实验模型之间动力响应的相似关系。根据抗震规范要求和相似准则,采用El Centro 1979地震波作为实验台地震输入,对振动台震动输入进行调幅处理,水平地震输入幅值为0.3g,竖向地震输入幅值为0.2g,地震输入的时间缩尺为4。核环吊抗震实验结果表明,与实验台地震输入峰值相对比,吊车大梁跨中水平加速度峰值增加了56.0%,跨中竖向的加速度峰值增加了119.0%;环轨水平加速度峰值增加了66.7%,环轨竖向的加速度峰值增加了43.5%。研究表明,当水平地震波的输入方向与吊车大梁轴线相垂直时,吊车大梁跨中水平加速度峰值最大;当水平地震波的输入方向与吊车大梁轴线相平行时,环轨的水平加速度峰值最大;环轨的垂直加速度峰值受水平地震波的输入方向影响不显著。在地震荷载作用下,核环吊没有发生跳轨现象。展开更多
Dual-well steam assisted gravity drainage(SAGD) has significant potential for extra-heavy oil recovery.China is conducting two dual-well SAGD pilot projects in the Fengcheng extra-heavy oil reservoir.Quick,direct pred...Dual-well steam assisted gravity drainage(SAGD) has significant potential for extra-heavy oil recovery.China is conducting two dual-well SAGD pilot projects in the Fengcheng extra-heavy oil reservoir.Quick,direct predictions of the oil production rate by algebraic models rather than complex numerical models are of great importance for designing and adjusting the SAGD operations.A low-pressure scaled physical simulation was previously used to develop two separate theoretical models corresponding to the two different growth stages observed in the SAGD steam chambers,which are the steam chamber rising stage and the steam chamber spreading stage.A high-pressure scaled model experiment is presented here for one dual-well SAGD pattern to further improve the prediction models to reasonably predict oil production rates for full production.Parameters that significantly affect the oil recovery during SAGD were scaled for the model size based on the reservoir characteristics of the Fengcheng reservoir in China.Experimental results show the relationship between the evolution of the steam chamber and the oil production rate during the entire production stage.High-pressure scaled model test was used to improve the gravity drainage models by modifying empirical factors for the rising model and the depletion model.A new division of the SAGD production regime was developed based on the relationship between the oil production rate and the evolution of steam chamber.A method was developed to couple the rising and depletion models to predict oil production rates during the SAGD production,especially during the transition period.The method was validated with experiment data and field data from the literature.The model was then used to predict the oil production rate in the Fengcheng reservoir in China and the Athabasca reservoir in Canada.展开更多
文摘基于量纲分析理论,提出地震作用下环行吊车缩尺模型动力响应的相似准则,确定核环吊原型和实验模型之间动力响应的相似关系。根据抗震规范要求和相似准则,采用El Centro 1979地震波作为实验台地震输入,对振动台震动输入进行调幅处理,水平地震输入幅值为0.3g,竖向地震输入幅值为0.2g,地震输入的时间缩尺为4。核环吊抗震实验结果表明,与实验台地震输入峰值相对比,吊车大梁跨中水平加速度峰值增加了56.0%,跨中竖向的加速度峰值增加了119.0%;环轨水平加速度峰值增加了66.7%,环轨竖向的加速度峰值增加了43.5%。研究表明,当水平地震波的输入方向与吊车大梁轴线相垂直时,吊车大梁跨中水平加速度峰值最大;当水平地震波的输入方向与吊车大梁轴线相平行时,环轨的水平加速度峰值最大;环轨的垂直加速度峰值受水平地震波的输入方向影响不显著。在地震荷载作用下,核环吊没有发生跳轨现象。
基金supported by the National Key Science and Technology Project of China (Grant No. 2011ZX05012)
文摘Dual-well steam assisted gravity drainage(SAGD) has significant potential for extra-heavy oil recovery.China is conducting two dual-well SAGD pilot projects in the Fengcheng extra-heavy oil reservoir.Quick,direct predictions of the oil production rate by algebraic models rather than complex numerical models are of great importance for designing and adjusting the SAGD operations.A low-pressure scaled physical simulation was previously used to develop two separate theoretical models corresponding to the two different growth stages observed in the SAGD steam chambers,which are the steam chamber rising stage and the steam chamber spreading stage.A high-pressure scaled model experiment is presented here for one dual-well SAGD pattern to further improve the prediction models to reasonably predict oil production rates for full production.Parameters that significantly affect the oil recovery during SAGD were scaled for the model size based on the reservoir characteristics of the Fengcheng reservoir in China.Experimental results show the relationship between the evolution of the steam chamber and the oil production rate during the entire production stage.High-pressure scaled model test was used to improve the gravity drainage models by modifying empirical factors for the rising model and the depletion model.A new division of the SAGD production regime was developed based on the relationship between the oil production rate and the evolution of steam chamber.A method was developed to couple the rising and depletion models to predict oil production rates during the SAGD production,especially during the transition period.The method was validated with experiment data and field data from the literature.The model was then used to predict the oil production rate in the Fengcheng reservoir in China and the Athabasca reservoir in Canada.
