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公开(公告)号：US5783628A
公开(公告)日：1998-07-21
申请号：US612434
申请日：1996-03-07
CPC分类号： B01F17/0028 , C08F8/00 , C08F8/44
摘要： A modified polyvinyl alcohol is disclosed, which comprises the following structural units (I) and (II) and has a weight average molecular weight of from 3,000 to 400,000: ##STR1## wherein R.sup.1 represents H or CH.sub.3 ; and M.sup.1 represents H, an alkali metal, ammonium, alkylammonium, or alkanolammonium. The modified polyvinyl alcohol may be sulfonated. The modified polyvinyl alcohol is used as a dispersant such as a drilling fluid additive.
摘要翻译： 公开了一种改性的聚乙烯醇，其包含以下结构单元（I）和（II），其重均分子量为3,000至400,000：（I）其中R 1表示H或 CH3; M1表示H，碱金属，铵，烷基铵或烷醇铵。 改性的聚乙烯醇可以被磺化。 改性聚乙烯醇用作分散剂如钻井液添加剂。
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公开(公告)号：US4582452A
公开(公告)日：1986-04-15
申请号：US616375
申请日：1984-06-01
CPC分类号： C09K8/887 , C09K17/48 , Y02P20/149 , Y10S507/903 , Y10S507/935 , Y10S524/916
摘要： A process for forming a gel by gelling an aqueous solution of a water-soluble polymer with a chromium compound as a gelling agent, in which a copolymer of acrylamide, 0.5 to 40% by mole of an unsaturated sulfonic acid or its salt, and optionally an unsaturated carboxylic acid or its salt having an intrinsic viscosity of at least 10 in 1N-NaNO.sub.3 at 30.degree. C., is used as the water-soluble polymer, and which is availably applied to improvement of water-oil ratio in oil production and to civil engineering for preventing leakage of underground water. The formed gel is very stable in a water system containing salts in high concentrations at high temperatures.
摘要翻译： 通过将水溶性聚合物的水溶液与铬化合物作为胶凝剂凝胶化形成凝胶的方法，其中丙烯酰胺共聚物为0.5〜40摩尔％的不饱和磺酸或其盐，以及任选地 使用在30℃下在1N-NaNO 3中特性粘度至少为10的不饱和羧酸或其盐作为水溶性聚合物，可用于提高油生产中的水油比， 用于防止地下水泄漏的土木工程。 形成的凝胶在含有高浓度盐的高温系统的水体系中非常稳定。
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