Well drilling is a significant and inseparable part of spacer fluid market industry. During the drilling and completion of a well, spacers are extremely crucial. Spacers separate the drilling fluid and cement in the drilling devices. Owing to their chemical incompatibility, the possibilities of acute gelatin or flocculation are enhanced during this process. After the drilling fluid has been run down the drill string, spacer fluids are pumped down the drill string before the cement slurry is poured in. A spacer fluid is used in cementing operations to separate the cement from the drilling fluid. With the growth of the energy and natural resources industries, spacer fluid is expected to become more popular.

The nepheline market is segmented on the basis of product type, application, and region. By product type, the market is classified into nepheline syenite, nepheline monzonite, and nephelinites. Depending on application, it is segregated into ceramic products, glass products, refractories, and others. Region wise, it is analyzed across North America, Europe, Asia-Pacific, and LAMEA. The report covers the strategies adopted by key players in the market to sustain the competitive environment and increase their market share. The key players operating in the global market include AGSCO Corporation, Unimin Corp. (COVIA), Phos Agro Group of Companies, Anglo Pacific Minerals Ltd., Anyang Country Mining Co Ltd., SCR Sibelco, RUSAL PLC, The 3M Company, Finetons Industrial Minerals Ltd., and North Cape Minerals AS. In addition, the market drivers, restraints, and opportunities are explained in the report.

本文概述了海洋资源环境状况，海洋资源环境面临的危机，提出人类社会与海洋共生共荣的理念。

本文介绍了中国海洋污染治理与生态环境养护状况，分析了中国海洋资源可持续利用状况，并比较了中国海洋环境养护与海洋资源利用现状与目标之间的差距。

世界各国各地区的发展都与海洋息息相关，为此许多国家和地区都非常重视海洋，有些国家还将海洋的发展提升到国家战略层面，通过制定国家或地区的海洋战略和政策来明确自身海洋事业的发展方向，实现海洋生态环境的养护和海洋资源的可持续利用。由于地理、政治、经济、历史、社会和文化等各方面的差异，不同国家和地区制定了各有特色的海洋战略、政策法规和行动计划。本文以美国、欧盟、韩国为例，对其进行了基本情况介绍，典型做法，突出成就，并指出不足。

人类社会已迈入海洋世纪，一方面，海洋经济在新的社会发展背景下有了更多的发展机遇，焕发出新的活力；另一方面，海洋经济的蓬勃发展严重挑战着海洋生态环境和海洋资源的承载能力。海洋生态环境的污染与破坏、海洋资源的过度开发利用成为制约海洋经济向纵深发展的重要因素，也是我国实现海洋可持续发展所面临的最重要的挑战。因此，当前环境下如何抓住机遇，可持续地发展海洋经济以促进社会福利增加，成为全社会共同关注的话题。