共查询到20条相似文献，搜索用时 125 毫秒
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根据钻探工作的需要，在实验室内利用自制的泡沫流变装置测定了泡沫的流型，证明了泡沫属非牛顿流体，其流变参数随气液比、泡沫剂加量的改变而改变，其它添加剂也影响泡沫的流变性能，最后讨论了测试结果对泡沫钻进的指导作用。 相似文献
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DF—1型泡沫剂的研制和应用 总被引：1，自引：0，他引：1
从提高钻井效率,保护孔壁,提高岩矿芯采取率的技术要求出发,研制出专门用于多工艺空气钻进配制泡沫液和泡沫泥浆的新型泡沫剂－ＤＦ－１型泡沫剂,用该泡沫剂配制的低密度钻井液体系适用于低压漏失,孔壁失稳,干旱缺水等复杂条件的钻进,取得了令人满意的成效。 相似文献
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在山西长子县某水源井施工中,利用现有7/9压风机与TB850/50泥浆泵设备,采用泡沫增压钻进技术进行钻探.在钻进过程中,调整参数为：气液比180～240,泡沫液浓度4%～8%.随着钻探进尺的加快和地层出水量的增加,适当增加泡沫剂的浓度,达到降低气液比,有利于携粉,提高钻效.实践证明,采用泡沫钻进要比常规泥浆钻进钻效提高31.7%,纯钻时间利用率提高3.4%,综合成本降低56.1%. 相似文献
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泡沫潜孔锤应用于水文水井钻探的钻进工艺初探 总被引：2，自引：1，他引：1
泡沫潜孔锤是将普通潜孔锤的工作介质从单一流体(空气)变成两相流体的压缩泡沫,并以泡沫作为动力介质驱动潜孔锤工作的新型工艺方法.从分析泡沫潜孔锤的结构特点和工作原理出发,结合室内实验,在钻进设备的配套、灌注系统的设计、钻进规程参数的选择等方面,对泡沫潜孔锤应用于水文水井钻探的钻进工艺进行了研究.结果表明,泡沫潜孔锤钻进技术有着广泛的应用前景. 相似文献
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利用分子模拟软件Materials Studio（MS）建立了一定温度、压力条件下，考虑含水煤层、泡沫压裂液起泡剂、稳泡剂相互作用的狭缝孔分子模拟模型。基于分子扩散理论计算并评价了分别在常见的4种起泡剂以及4种稳泡剂影响下的甲烷分子扩散能力大小。结果表明，与原始含水煤层相比，加入起泡剂十二烷基磺酸钠、十二烷基硫酸钠、十二烷基苯磺酸钠和甜菜碱后，甲烷自扩散系数分别降低了71.3%、74.7%、56.3%和54.0%。相比于仅加入起泡剂（十二烷基苯磺酸钠）的情况下，加入稳泡剂聚丙烯酰胺、聚乙烯醇、聚乙二醇和羧甲基纤维素后，甲烷自扩散系数分别降低了63.2%、57.9%、55.3%和71.1%。据此可知，起泡剂是降低含水煤层中甲烷扩散能力的主要因素，而稳泡剂的使用会进一步降低甲烷扩散能力。在起泡剂和稳泡剂的共同影响下，甲烷自扩散系数降低超过了80%，这对煤层气产出极为不利。建议在保证泡沫压裂液泡沫性能前提下，通过优化起泡剂分子结构、减少用量以减小起泡剂和稳泡剂对甲烷扩散的影响，并尽量避免使用大分子稳泡剂。 相似文献
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T. Dunkel E. L. de León Gallegos C. Bock A. Lange D. Hoffmann J. Boenigk M. Denecke 《International Journal of Environmental Science and Technology》2018,15(6):1139-1158
In this study, Illumina sequencing was used for the identification of bulking and foaming bacteria in industrial wastewater treatment plants. The reliable identification of bulking and foaming bacteria represents the first step in developing effective and specific control strategies to avoid disturbances in activated sludge systems. Illumina sequencing revealed 432 16S rRNA operational taxonomic units, representing phylotypes and including 21 bulking and foaming bacteria in the two investigated industrial wastewater treatment plants. Foaming represents the most severe problem in the cascade biology system. Up to 22.5% of all sequencing reads are bulking and foaming bacteria, including Chryseobacterium, Candidatus Microthrix parvicella and Gordonia sp. as the dominant bulking and foaming bacteria which are known for foam formation. Moreover, Illumina sequencing revealed an increase in Candidatus Microthrix parvicella and Gordonia sp. reads from activated sludge to foam and scum samples, indicating a preferred flotation and/or growth advantages in the foam and scum layers. Analyses of the taxonomic assignment and distribution showed that the phylum Actinobacteria is the most dominant phylum, underlining the key role of Actinobacteria in bulking and foaming. Multivariate data analysis was applied, revealing that the dominant bulking and foaming bacteria are positively correlated with the sludge age and influent flow and negatively correlated with the dissolved oxygen level and the temperature. In terms of developing a specific control strategy, the positive linear relationships to the fatty acid and surfactant sludge loadings are highlighted and the removal of lipid compounds from the wastewater influent could avoid an overgrowth of bulking and foaming bacteria. 相似文献
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Investigation on foaming properties of some organics for oily bubble bitumen flotation 总被引：1，自引：0，他引：1
Studies have shown that using organic coated bubbles (“oily” bubbles) could increase bitumen recovery rate in flotation. One way to coat bubbles is that used in the air-assisted solvent extraction process where solvent foam is formed and injected through a capillary to release solvent coated bubbles in a controlled manner into the aqueous system. To investigate adapting this approach, the foaming properties of some organics (Hexane, Heptane, Hexadecane, Petroleum Ether, Toluene, Benzene and Kerosene and their binary mixtures) of potential interest in oily bubble bitumen flotation were investigated. Silicone oil was found to be a good foaming agent in some cases. Bubble stability and film thickness experiments were carried out to help select candidate organics. Surface tension and dynamic viscosity measurements were conducted to examine the mechanism of foaming. Attachment studies showed that droplets of the selected organics readily attached to a bitumen surface compared to air bubbles. From a combination of criteria, 25:75 Hexadecane/Heptane appears to be a promising candidate. 相似文献
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F. Hosseini F. Malekzadeh N. Amirmozafari N. Ghaemi 《International Journal of Environmental Science and Technology》2007,4(1):127-132
Sodium dodecyl sulphate, (SDS) is an anionic surfactant that widely used all over the world. They will eventually end-up and accumulate in household or industrial sewage. Due to their high foaming capabilities, which can cause numerous problems in sewage treatment facilities as well as direct toxic effects on many different organisms in ecosystem; they are generally considered as serious pollutants. In this survey, two different bacteria were isolated from Tehran municipal activated sludge. Biochemical tests as well as 16S rRNA gene sequencing for identification have been applied. After experiments to optimize the pH and temperature for growth of the two bacterial isolates, the extent of SDS utilization was evaluated by HPLC method. Two bacterial isolates show which ability to rapidly and actively degrade SDS upon using it as their sole source of carbon. The identification tests have indicated the two isolates to be Acinetobacter johnsoni and Pseudomonas beteli. The Pseudomonas beteli and Acinetobacter johnsoni isolates were able to degrade 97.2% and 96.4% of the original SDS levels after 10 days of growth; respectively. Mixed culture of the two isolates did not significantly increase SDS utilization, (97.6%). In conclusion, the results of this study suggest that growth of simple bacteria such as Acinetobacter or Pseudomonas in household and industrial sewage can be cost-effective method anionic surfactants elimination. 相似文献
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利用Web Cache均衡Internet上大流量的请求以减轻Web站点压力的优点，将Web Cache技术与WebGIS技术相结合，一方面对Web Cache技术的概念、使用方法进行了阐述，另一方面以综合矿产预测在Web上的三维可视化为例，对如何提高基于WebGIS的综合矿产预测三维可视化站点性能问题进行了探讨。研究表明，在综合矿产预测三维可视化的WebGIS站点中应用Web Cache技术会从多方面大幅提升系统性能。 相似文献
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BS-100型土壤固化剂在季冻区的路用性能试验研究 总被引：9，自引：0，他引：9
采用美国Base-Seal固化剂(BS-100型),对长春地区典型黏性土进行了固化处理,同时对其加固土的路用性能进行了系统地试验研究.首先,进行了Base-Seal固化剂加固土的最佳配合比筛选试验,在此基础上进行了最佳配合比条件下加固土的无侧限抗压强度、间接抗拉强度、室内回弹模量、冻稳定性、水稳定性和渗透性等路用性能指标方面的试验研究,得出Base-Seal固化剂加固土作为路面基层材料具有早期强度和回弹模量高、抗弯拉性能、冻稳定性能、水稳定性能和抗渗性能好的结论,适合在长春地区及其气候、土质相似地区的道路工程中应用. 相似文献