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油水井环空保护技术研究进展 被引量:6
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作者 刘清云 高峰 +1 位作者 吾买尔江 罗跃 《河南化工》 CAS 2010年第20期12-15,共4页
油水井环套空间由于水质的恶化,常常导致套管严重腐蚀破坏、结垢堵塞,环空保护液是目前套管防护的主要方法。总结了多年来的技术方法,分析了导致油水井腐蚀破坏的主要因素,指出复配缓蚀剂、杀菌剂、阻垢剂的环空保护液虽然有明显效果,... 油水井环套空间由于水质的恶化,常常导致套管严重腐蚀破坏、结垢堵塞,环空保护液是目前套管防护的主要方法。总结了多年来的技术方法,分析了导致油水井腐蚀破坏的主要因素,指出复配缓蚀剂、杀菌剂、阻垢剂的环空保护液虽然有明显效果,但新型多功能缓蚀杀菌剂如咪唑啉乙酸盐系列效果更好。 展开更多
关键词 油水井 环空保护技术 保护 腐蚀破坏 缓蚀杀菌剂 复配缓蚀剂 主要因素 主要方法 套管防护 明显效果 结垢堵塞 技术方法 阻垢剂 乙酸盐 咪唑啉 多功能 总结 水质
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Measuring Chinese Marine Environmental Efficiency:A Spatiotemporal Pattern Analysis 被引量:3
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作者 DI Qianbin ZHENG Jinhua YU Zhe 《Chinese Geographical Science》 SCIE CSCD 2018年第5期823-835,共13页
Environmental efficiency standards are often used to evaluate the costs of oceanic economic development. A variety of statistical analyses were applied in this study to quantify the marine environmental efficiency of ... Environmental efficiency standards are often used to evaluate the costs of oceanic economic development. A variety of statistical analyses were applied in this study to quantify the marine environmental efficiency of 11 Chinese coastal provinces and municipalities between 2000 and 2014. Results initially reveal that environmental efficiency measures that incorporate undesirable outputs are more consistent with real production conditions and thus the use of marine economic and environmental efficiencies supplement and complement one another. Second, overall marine environmental efficiency across China tends to be low and can be spatially characterized by a transformation such that the inefficiencies noted in 2000 have subsequently been transformed to comprise a three-tiered structure that encompasses northern, central, and southern cores. Third, variation in absolute and relative marine environmental efficiency differences for the coastal regions of China have been consistent over time; values initially decreased before increasing again in a fluctuating manner over the time period of this analysis. Fourth, data show that the Pearl River Delta area has experienced the highest rate of change in marine environmental efficiency over time when economic zones are used as basic research units, although values have nevertheless fluctuated significantly. Fifth, values for total factor productivity as well as technical efficiency and change across the Chinese marine economy all fluctuated over time but increased. Data show that changes in marine environmental efficiency across China can primarily be attributed to progress in marine science and technology. Finally, levels of capital investment and marine industrial pollution intensity are not significantly correlated with marine environmental efficiency. Indeed, both marine industrial structural levels and environmental protection technologies have had a positive effect on environmental efficiency while levels of investment in marine scientific research as well as the scale of economic development, the marine economy, and the degree of external openness have all exerted negative effects on this key variable. 展开更多
关键词 marine environmental efficiency undesirable output SBM-Malmquist model Tobit regression analysis
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