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一、褐煤自五十年代初就开始应用于石油钻井,并且至今仍作为一类重要助剂得以应用和发展 50~70年代,人们只是直接简单地利用褐煤的天然性质—含羧基及其它亲水基团(-OH)多而分子量小(10~3的数量级)的特
First, lignite has been used in oil drilling since the early 1950s and is still being used and developed as an important class of additives. From the 1950s to the 1970s, people simply took advantage of the natural properties of lignite - including carboxyl and other hydrophilic Many groups (-OH) and low molecular weight (10 to 3 orders of magnitude)