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渗碳和碳氮共渗层特征的研究 被引量:4
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作者 徐跃明 林力 王骅鸣 《金属热处理》 CAS CSCD 北大核心 1991年第11期7-12,共6页
研究了渗碳层及碳氮共渗层一些最基本的特征,如碳氮浓度分布、显微硬度分布、残留奥氏体量和碳化物等,比较了渗碳和碳氮共渗两种渗层在这些方面的差别,并分析了造成这些差别的原因。
关键词 碳氮共 渗层特征
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扩散期对离子碳氮共渗层的影响
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作者 陈岩 陈俭康 张照军 《金属热处理》 CAS CSCD 北大核心 2001年第12期23-25,共3页
对 2 0CrMnTi和 2 0Cr2Ni4钢进行了总时间相同但强渗 /扩散比不同的离子碳氮共渗试验。通过光学显微镜、显微硬度计和剥层试样的化学分析对共渗层的组织特点、硬度梯度和碳、氮浓度分布进行了分析研究。试验结果表明 ,强渗 /扩散时间比... 对 2 0CrMnTi和 2 0Cr2Ni4钢进行了总时间相同但强渗 /扩散比不同的离子碳氮共渗试验。通过光学显微镜、显微硬度计和剥层试样的化学分析对共渗层的组织特点、硬度梯度和碳、氮浓度分布进行了分析研究。试验结果表明 ,强渗 /扩散时间比不同时渗层特征明显改变。当强渗 /扩散比为 1∶1时 ,渗层显微组织、硬度梯度和碳、氮浓度分布均比较好。扩散时间不足时 ,渗层的次表层会出现硬度分布的低谷 ;扩散期太长 。 展开更多
关键词 离子碳氮共 渗层特征 硬度
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安岳-威东地区须家河组低渗、低阻油气层形成机理 被引量:1
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作者 张春 蒋裕强 +2 位作者 郭红光 徐后伟 季春海 《国外测井技术》 2010年第2期34-37,4,共4页
安岳~威东地区须家河组低渗储层中普遍发育低阻油气层,其成因类型多样、识别难度大。针对这一问题,利用岩心分析化验资料,结合低阻油气层测井响应特征,综合分析认为,造成该地区低渗低阻油气层的主要因素为:①高不动水饱和度;②... 安岳~威东地区须家河组低渗储层中普遍发育低阻油气层,其成因类型多样、识别难度大。针对这一问题,利用岩心分析化验资料,结合低阻油气层测井响应特征,综合分析认为,造成该地区低渗低阻油气层的主要因素为:①高不动水饱和度;②高地层水矿化度;③低幅度构造背景引起气水分异差;④复杂的孔隙结构造成油气运移对地层水驱替不彻底,残留大量地层水。此外,局部富集导电矿物和钻井液侵入进一步降低了油气层的电阻率。弄清了低渗背景下发育的低阻油气层形成机理,探索出低阻变化规律及其与储层物性之间的关系,为准确识别和评价低阻油气层提供有利的依据,这也为下一步勘探开发奠定可靠的地质基础。 展开更多
关键词 安岳-威东地区 低阻油气特征 形成机理 提供依据
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铝稀土共渗钢及其耐腐蚀性能 被引量:2
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作者 盛长松 姚嫔 《石油化工设备技术》 CAS 2011年第1期35-37,42,共4页
介绍了研制铝稀土共渗钢的热处理工艺及在渗铝剂中加入稀土化合物的情况。在原有渗铝剂中,添加5种价格较合理、性质较稳定的稀土化合物,在一定的热处理条件下进行包埋共渗实验。通过对比分析,确定了共渗效果良好的稀土化合物并确定了添... 介绍了研制铝稀土共渗钢的热处理工艺及在渗铝剂中加入稀土化合物的情况。在原有渗铝剂中,添加5种价格较合理、性质较稳定的稀土化合物,在一定的热处理条件下进行包埋共渗实验。通过对比分析,确定了共渗效果良好的稀土化合物并确定了添加量的最佳值。对铝稀土共渗层组织和共渗层中的铝、稀土浓度及渗层的显微硬度进行了分析,并对铝稀土共渗钢进行了腐蚀实验。结果表明,铝稀土共渗层连续、致密,铝稀土浓度和显微硬度由表及里梯度降低平缓。铝稀土共渗钢的耐高温环烷酸、高温硫腐蚀和抗高温氧化性能优于渗铝钢。 展开更多
关键词 铝稀土共 渗层特征 耐蚀性能
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Permeability variation characteristics of coal after injecting carbon dioxide into a coal seam 被引量:2
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作者 Ni Xiaoming Li Quanzhong +1 位作者 Wang Yanbin Gao Shasha 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2015年第4期665-670,共6页
A theoretical basis for the optimization of carbon dioxide injection parameters and the development of the drainage system can be provided by identifying the permeability change characteristic of coal and rock after i... A theoretical basis for the optimization of carbon dioxide injection parameters and the development of the drainage system can be provided by identifying the permeability change characteristic of coal and rock after injection of carbon dioxide into the coal seam. Sihe, Yuwu, and Changcun mines were used as research sites. Scanning electron microscopy and permeability instruments were used to measure coal properties such as permeability and surface structure of the coal samples at different pH values of carbon dioxide solution and over different timescales. The results show that the reaction between minerals in coal and carbonate solution exhibit positive and negative aspects of permeability-the dissolution reaction between carbonate minerals in coal and acid solution improves the conductivity of coal whilst, on the other hand, the clay minerals in the coal (mainly including montmorillonite, illite and kaolinite) exhibit expansion as a result of ion exchange with the H~ in acid solution, which has a negative effect on the per- meability of the coal. The permeability of coal samples increased at first and then decreased with immer- sion time, and when the soaking time is 2-3 months the permeability of the coal reached a maximum. In general, for coals with permeabilities less than 0.2 mD or greater than 2 roD, the effect on the permeabil- ity is low: when the permeability of the coal is in the range 0.2-2 mD, the effect on the permeability is highest. Research into permeability change characteristics can provide a theoretical basis for carbon diox- ide injection under different reservoir permeability conditions and subsequent drainage. 展开更多
关键词 Carbon dioxide Coal reservoir PERMEABILITY Change characteristics
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Geochemical characteristics of reservoir after water and polymer flooding in Xingshugang oilfield of Daqing
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作者 TIAN Zhishan 《Global Geology》 2012年第4期302-310,共9页
Collecting 44 oil-sand specimens of Pu-I Member in two inspection wells before and after polymer flooding in the thirteenth district of Xingshugang oilfield,with experimental analysis,the author obtained the data abou... Collecting 44 oil-sand specimens of Pu-I Member in two inspection wells before and after polymer flooding in the thirteenth district of Xingshugang oilfield,with experimental analysis,the author obtained the data about oil viscosity,flow,oil saturation and oil displacement efficiency.The result shows that viscous oil predominates in the main remaining oil in Xingshugang oilfield after water flooding with a certain amount of low viscosity oil,high viscosity oil and heavy oil;after polymer flooding,the viscous oil is main ingredient.Compared with water flooding,the low mobility and poor oil can be spread by polymer flooding,expanding the affected area and improving sweep efficiency and oil recovery.The geochemical affecting factors of water flooding and oil displacement efficiency refer to reservoir flow,permeability and the viscosity of residual oil.In the reservoir with permeability from low to high,the polymer flooding efficiency is better than water flooding.It provides the basis for improving the water and polymer flooding efficiency of the Xingshugang oilfield. 展开更多
关键词 water flooding polymer flooding reservoir mobility oil displacement efficiency
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