The formation of abnormally low-pressure hydrocarbon reservoirs in petroliferous basins has a close relationship with tectonic uplift and the consequent erosion. In order to understand abnormally low-pressure reservoi...The formation of abnormally low-pressure hydrocarbon reservoirs in petroliferous basins has a close relationship with tectonic uplift and the consequent erosion. In order to understand abnormally low-pressure reservoirs and to provide a scientific basis for exploration and development, we established, through numerical simulation and theoretical analysis, a set of equations for the formation pressure in a closed system influenced by uplift-erosion, discussed the relationship between the genesis of abnormal pressure and uplift-erosion, and put forward the concept of balance pressure （P b ）. The results showed that abnormally high pressure coefficient may form when the current formation pressure was higher than P b , and abnormally low pressure may form when the current formation pressure was lower than P b . In the Santanghu Basin, the current formation pressure of abnormally low pressure reservoirs is lower than P b , so tectonic uplift-erosion leads to the decrease of the pressure coefficient. There is a positive correlation between the pressure drop caused by the decrease of fluid temperature and the rebound of rock porosity and strata erosion. Calculation results indicated that the reservoir pressure of Jurassic strata in the Santanghu Basin was decreased by 11.6-17.1 MPa due to tectonic uplift-erosion during the Late Yanshanian period.展开更多
针对高马赫数高温条件下飞机进气道射流预冷问题,本文建立了真实飞机全尺寸进气道-射流预冷装置一体化数值计算模型,通过控制变量法分析了进气流量、进气温度及射流流量对射流预冷装置性能的影响规律,发现进气流量与降温量呈负相关,与...针对高马赫数高温条件下飞机进气道射流预冷问题,本文建立了真实飞机全尺寸进气道-射流预冷装置一体化数值计算模型,通过控制变量法分析了进气流量、进气温度及射流流量对射流预冷装置性能的影响规律,发现进气流量与降温量呈负相关,与蒸发效率和温场均匀性呈正相关;进气温度与降温量、蒸发效率及温场均匀性均呈正相关;射流流量与降温量呈正相关,与蒸发效率及温场均匀性呈负相关。研究结果表明,在相同进气状态下,此飞机进气道的特殊构型会导致降温量和蒸发效率曲线在蒸发距离为2500mm处存在拐点。在此基础上,进一步提出了一种基于试验设计法(Design of experiment,DOE)评估进气道出口总温的评估方法,与试验结果对比发现该方法可将误差控制在5%以内。因此,采用该方法进行进气道出口总温预估是有效的。展开更多
The progress of the GAG gas flow in a conveyor drift is investigated.The output of a calculation model is evaluated and compared with experimental results from full-scale inertisation experiments.Expressions presentin...The progress of the GAG gas flow in a conveyor drift is investigated.The output of a calculation model is evaluated and compared with experimental results from full-scale inertisation experiments.Expressions presenting the fastest and most extensive condensation of water resulted in well fitted arrival times of the GAG gas front.A common denominator for the two sets of expressions is that the type of flow is considered and thus better fitted to the actual flow situation.The model was further refined to include the surface roughness factor in the condensation calculations,which resulted in time lengths even closer to the measured time length.The measured rapid temperature increase at certain positions along the conveyor drift was found to fit well with the calculated GAG gas front arrival at the corresponding positions.The magnitude of the GAG flow was found to have a large impact on the arrival time of the GAG gas front.Knowing and understanding the GAG gas behaviour would increase the likelihood of successful inertisation of all or part of a mine.展开更多
Solar powered cold water dispenser apparatus is fabricated and experimental results are shown in this work. The system contains solar panels, two low energy fans, water tank fabricated from clay (pottery), thermally s...Solar powered cold water dispenser apparatus is fabricated and experimental results are shown in this work. The system contains solar panels, two low energy fans, water tank fabricated from clay (pottery), thermally sealed box, and pipes. Once these contents are connected together, testing was conducted on water temperatures at both ends. The preliminary results showed a drop in temperature of around 15℃. This is achieved by utilizing free power from the sun.展开更多
基金supported by the National Natural Science Foundation of China (No. 40802027)China "973" Project (No. 2009CB219604)the Risk Innovation Foundation of PetroChina Co. Ltd. (No. 0706d01040102)
文摘The formation of abnormally low-pressure hydrocarbon reservoirs in petroliferous basins has a close relationship with tectonic uplift and the consequent erosion. In order to understand abnormally low-pressure reservoirs and to provide a scientific basis for exploration and development, we established, through numerical simulation and theoretical analysis, a set of equations for the formation pressure in a closed system influenced by uplift-erosion, discussed the relationship between the genesis of abnormal pressure and uplift-erosion, and put forward the concept of balance pressure （P b ）. The results showed that abnormally high pressure coefficient may form when the current formation pressure was higher than P b , and abnormally low pressure may form when the current formation pressure was lower than P b . In the Santanghu Basin, the current formation pressure of abnormally low pressure reservoirs is lower than P b , so tectonic uplift-erosion leads to the decrease of the pressure coefficient. There is a positive correlation between the pressure drop caused by the decrease of fluid temperature and the rebound of rock porosity and strata erosion. Calculation results indicated that the reservoir pressure of Jurassic strata in the Santanghu Basin was decreased by 11.6-17.1 MPa due to tectonic uplift-erosion during the Late Yanshanian period.
文摘针对高马赫数高温条件下飞机进气道射流预冷问题,本文建立了真实飞机全尺寸进气道-射流预冷装置一体化数值计算模型,通过控制变量法分析了进气流量、进气温度及射流流量对射流预冷装置性能的影响规律,发现进气流量与降温量呈负相关,与蒸发效率和温场均匀性呈正相关;进气温度与降温量、蒸发效率及温场均匀性均呈正相关;射流流量与降温量呈正相关,与蒸发效率及温场均匀性呈负相关。研究结果表明,在相同进气状态下,此飞机进气道的特殊构型会导致降温量和蒸发效率曲线在蒸发距离为2500mm处存在拐点。在此基础上,进一步提出了一种基于试验设计法(Design of experiment,DOE)评估进气道出口总温的评估方法,与试验结果对比发现该方法可将误差控制在5%以内。因此,采用该方法进行进气道出口总温预估是有效的。
文摘The progress of the GAG gas flow in a conveyor drift is investigated.The output of a calculation model is evaluated and compared with experimental results from full-scale inertisation experiments.Expressions presenting the fastest and most extensive condensation of water resulted in well fitted arrival times of the GAG gas front.A common denominator for the two sets of expressions is that the type of flow is considered and thus better fitted to the actual flow situation.The model was further refined to include the surface roughness factor in the condensation calculations,which resulted in time lengths even closer to the measured time length.The measured rapid temperature increase at certain positions along the conveyor drift was found to fit well with the calculated GAG gas front arrival at the corresponding positions.The magnitude of the GAG flow was found to have a large impact on the arrival time of the GAG gas front.Knowing and understanding the GAG gas behaviour would increase the likelihood of successful inertisation of all or part of a mine.
文摘Solar powered cold water dispenser apparatus is fabricated and experimental results are shown in this work. The system contains solar panels, two low energy fans, water tank fabricated from clay (pottery), thermally sealed box, and pipes. Once these contents are connected together, testing was conducted on water temperatures at both ends. The preliminary results showed a drop in temperature of around 15℃. This is achieved by utilizing free power from the sun.
