共查询到20条相似文献,搜索用时 46 毫秒
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油砂山油田Ⅵ断块以前主要靠天然能量开采,驱动能量主要为弹性驱和少量的溶解气驱,Ⅳ断块在2000年投入注水开发,Ⅵ断块2008年正式投入注水开发。油田Ⅵ断块因油砂体展布性差,砂体"薄、多、散"特征明显。导致常规注水开发效果较差。水井一线油井见效时间慢、受效井多为单向受效。因此油田开展先期注水试验摸索大排量注水下油井见效时间、井组生产规律等资料为油田Ⅵ断块后期开发积累经验。 相似文献
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佘金萍 《中国石油和化工标准与质量》2018,(18)
随着经济的发展,我国对石油资源的需求趋势逐步增加,因此现今低渗透油田资源成为我国未来石油开采的主要对象,但是针对低渗透存在一个致命要点,就是低渗透油田油层的物性差,存在天然缝隙,往往会导致注水开发时水压力上升快,剖面矛盾突出,开采出的油井见水很不均匀,使油田出现低产,且采收效率极低等问题。因此对低渗透油田开发技术研究显得尤为重要,使其尽其所能,尽最大能力使低渗透油田得到有效开发。本文以吴起油田吴仓堡油区油藏为研究对象,以地质学等理论知识为基础,以钻井、测井、录井等数据为辅,系统的研究了该油区的地质特征、构造及油层储层特征等方面的条件,并规划部署了开发方案。在经过一系列调研分析后,对吴仓堡油区注水开发的油井网和各油井距进行了确定,还就菱形反九点和正方形井网形式的后期开发效果进行了比较,同时在注水开发过程中针对油井口的最大注水压力及合适压力进行了分析。总而言之,针对吴起油田吴仓堡油区的注水开发工艺技术是相当合理的,在后期油田开发效率上起到了作用,油田得到稳定增产。 相似文献
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YC油田为典型的低渗透、低丰度及低压油田,在注水开发过程中存在单井产能低、递减速度快及注水受效不均衡等问题。为了探索低渗透油田剩余油分布状况及开发潜力,开展了精细地质研究及储层测井资料归一化处理,在油区剩余油分布再评价的基础上,利用区域优势潜力资源进行滚动调控挖潜研究,结合采用有效工艺技术提出实施措施及调整部署,达到提高低渗透油田开发效果及效益的目的。 相似文献
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为掌握佛山市顺德新城区降水中污染物的情况,2015年7月至8月,文章作者分别在雨天进行了降水取样,对降水中的pH、电导率、常见阴离子(F-、Cl~-、NO_3~(2-)、SO_4~(2-))及部分重金属(铅和镉)进行监测分析。选择有相关数据的珠江三角洲和石家庄、厦门等地的降水中污染物的情况进行对比。结果表明,顺德新城区降水中的p H和部分阴离子浓度优于珠江三角洲平均值,酸雨类型属于硫酸和硝酸混合型;其水体洁净程度略差于石家庄;铅和镉的浓度也高于厦门,甚至部分超出了人体能直接接触的安全范围。 相似文献
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Saturated very long chain fatty acids (fatty acids with greater than 22 carbon atoms; VLCFA) accumulate in peroxisomal disorders,
but there is little information on their turnover in patients. To determine the suitability of using stable isotope-labeled
VLCFA in patients with these disorders, the metabolism of 22-methyl[23,23,23-2H3]tricosanoic (iso-lignoceric) acid was studied in rats in vivo and in human skin fibroblasts in culture. The deuterated iso-VLCFA was degraded to the corresponding 16- and 18-carbon iso-fatty acids by rats in vivo and by normal human skin fibroblasts in culture, but there was little or no degradation in peroxisome-deficient (Zellweger’s
syndrome) fibroblasts, indicating that its oxidation was peroxisomal. Neither the 14-, 20-, and 22-carbon iso-fatty acids nor the corresponding odd-chain metabolites could be detected. In the rat, the organ containing most of the iso-lignoceric acid, and its breakdown products, was the liver, whereas negligible amounts were detected in the brain, suggesting
that little of the fatty acid crossed the blood-brain barrier. Our data indicate that VLCFA labeled with deuterium at the
ω-position of the carbon chain are suitable derivatives for the in vivo investigation of patients with defects in peroxisomal β-oxidation because they are metabolized by the same pathways as the
corresponding n-VLCFA. Moreover, as iso-VLCFA and their β-oxidation products are readily separated from the corresponding n-fatty acids by normal chromatographic procedures, the turnover of VLCFA can be more precisely measured.
A preliminary report of part of this work (Reference 18) was presented at the 5th International Symposium on the Synthesis
and Applications of Isotopes and Isotopically Labelled Compounds, Strasbourg, France, June 20–24, 1994. 相似文献
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高效液相色谱法分析化妆品中微量成分的研究进展 总被引:1,自引:0,他引:1
综述了高效液相色谱法在化妆品中防腐剂、防晒剂中紫外线吸收剂以及性激素的检测等几个方面的应用;同时,介绍了分析所用的色谱柱、流动相、使用的检测手段以及样品的提取方法;最后针对目前存在的问题,提出了高效液相色谱用于化妆品中微量成分分析的研究方向和发展前景。 相似文献
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H. Toda Y. Mochizuki T. Kawanishi H. Kawashima 《Nutrient Cycling in Agroecosystems》2002,63(2-3):167-173
In a coastal agricultural area in the central part of Japan (Shizuoka), we found decreasing nitrate concentration with depth in a shallow groundwater, where the depth to water table varied between 0.6 and 1.2 m below ground surface. High nitrate concentrations (5–29 mg N L–1) were often observed in the upper layer (0–2 m) of the groundwater, but the concentration decreased to less than 1 mg N L–1 in the deeper layer. Ammonium was scarcely detected, and the concentration of dissolved oxygen was usually low (< 1 mgO2 L–1) in the groundwater. Nitrate in the groundwater often had very heavy nitrogen stable isotope ratios (>20{}). There was a negative relationship between nitrogen stable isotope ratio of nitrate and its concentration. When nitrate was injected into the groundwater with acetylene and bromide (a conservative tracer), nitrate concentration decreased to 20% of the initial level within 5 days, accompanied by the increase in nitrite and nitrous oxide concentration and a little change in bromide concentration. These results indicate that microbial denitrification plays a potential role in the decrease of nitrate in shallow groundwater at the study site. 相似文献
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我国硝酸工业生产技术新进展 总被引:1,自引:0,他引:1
系统叙述了我国硝酸工业2000-2007年生产现状及主要技术成果,尤其指出了国产"四合一"机组的成功投运,使我国硝酸国产化装置取得较大的进步,表现在吨酸的铂耗、氨耗和能耗等方面接近国外引进装置水平,同时介绍了国外双加压法硝酸生产技术的进展.我国已成为硝酸生产大国,仍需以先进的技术改造和发展我国硝酸工业,确保我国硝酸工业健康有序地发展,加快从硝酸生产大国向强国迈进的步伐. 相似文献