Anhydride-modified chitosan, method of preparation thereof, and fluids containing same
申请人:——
公开号:US20020098987A1
公开(公告)日:2002-07-25
The invention provides an organic diacid anhydride-modified chitosan containing a polar additive comprising water soluble compounds containing one or more hydroxyl groups or one or more amino groups, including compounds containing both hydroxyl and amine groups, having a molecular weight less than about 2000, preferably less than about 1000. The invention also provides fluids useful in various well drilling and servicing operations comprising an alkaline aqueous liquid containing an organic diacid anhydride, chitosan, and the polar additive therein, as well as a method of drilling wells therewith.
本发明提供了一种含有极性添加剂的有机二酸酐改性壳聚糖,极性添加剂包括含有一个或多个羟基或一个或多个氨基的水溶性化合物,包括同时含有羟基和胺基的化合物,分子量小于约2000,最好小于约1000。本发明还提供了可用于各种钻井和维修作业的液体,其中包括一种含有有机二酸酐、壳聚糖和极性添加剂的碱性含水液体,以及用其钻井的方法。