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深层低渗油层渗流规律及水驱油特征研究 总被引:3,自引:1,他引:3
深层低渗油藏的渗流规律及水驱油特征具有特殊性。通过中原油田文13北块的岩心试验资料的分析、研究,认为深层低渗油藏单相流体渗流表现为非达西流特征,渗透率越低,启动压力梯度越大;油水两相渗流特性反映束缚水饱和度高,油水两相流动范围窄;具有垂直于流动方向裂缝的储层采收率最高。为该块及同类型油藏分析剩余油分布规律、制定合理的提高采收率方案提供了依据。 相似文献
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王中良 《中国建筑金属结构》2001,(2):25-26
本公司原系专业门窗模具制造企业,20多年来一直在门窗行业精心耕耘,94年起调整产品结构,涉足门窗加工设备生产,成为行业内从事模具、设备一体化生产的企业。本人认为设备质量的优劣与门窗加工企业的质量及效益有直接的联系。就平时所 相似文献
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Distribution of rare earth elements in sewage-irrigated soil profiles in Tianjin, China 总被引:1,自引:0,他引:1
The concentrations of rare earth elements(REEs)in the soil extracts and soil solutions from two different alluvial soil profiles irrigated with sewage were measured using inductively coupled plasma-mass spectrometry.The results showed that the REE concentrations in the soil extracts from soil samples affected by sewage irrigation were much higher than those in virgin soil samples.The REE concentrations in the soil extracts of the rhizophere soil were higher than those of the non-rhizophere soil.The shale-normalized REE patterns in the soil extracts from the upper soil layer affected by sewage irrigation shown middle REE(MREE)enrichment relative to light REE(LREE)and heavy REE(HREE).This result was attributed to the MREE-rich organic colloidal material,REE-HM(humic and fulvic acids)and phosphate-REE complexations.The REE patterns in the soil extracts from deep soil little-affected by sewage irrigation showed HREE enrichment relative to LREE,which might have been caused by the preferential complexation of HREE with carbonate.The normalized La/Yb ratios in the soil extracts increased with the decrease in depth.The sewage irrigation did not affect the total REE contents and REE pattern in the soil profiles. 相似文献
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ICP-MS测定表生水体稀土过程中pH值对酸性膦萃取稀土效率的影响 总被引:2,自引:0,他引:2
针对目前最常用的液-液萃取、ICP-MS测定法检测表生水体中微量稀土元素方法,研究了不同pH值条件下,酸性膦(65%HDEHP和35%H2MEHP)自表生水体中萃取稀土元素(REEs)的回收率。结果表明,在pH1~4的范围内,不同性质的水体(湖泊、河流、地下水)有不同的REEs回收率。其中湖水在pH 1.8~3.7有90%以上的回收率,最高回收率为93.64%;河水在pH 2.1~3.5范围内有90%以上的回收率,最高回收率为95.52%;地下水仅在pH 1.3~1.5时回收率超过90%,最高回收率为97.61%。说明在萃取不同表生水体中稀土元素时,需要调到特定的pH值才能得到最好的萃取效果。 相似文献
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Inorganic Speciation of Rare Earth Elements in Chaohu Lake and Longganhu Lake, East China 总被引:1,自引:0,他引:1
Geochemical behaviors of the rare earth elements(REEs)in river and lake water bodies are dependentmainly on water chemistry and other factors,andhence their variationsin concentration and compositionreflect changes of various environmental variables.There… 相似文献
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酱油生产中的原料配比直接影响到成品风味与成品所含各种成分的比例,合理的原料配比是能够酿造出色、香、味、体俱佳酱油的首要条件,原料配比对酱油成品的影响可以通过对中间环节的影响表现出来,本文从酱油生产中的制曲、发酵、后处理以及成品储藏等几个环节阐述淀粉质原料在酱油生产中的重要性. 相似文献