Effect of Agents on Hydrate Formation and Low-Temperature Rheology of Polyalcohol Drilling Fluid  

作　　者：蒋国盛 宁伏龙 张凌 涂运中 

机构地区：[1]Faculty of Engineering,China University of Geosciences

出　　处：《Journal of Earth Science》2011年第5期652-657,共6页地球科学学刊（英文版）

基　　金：supported by "863" Program (No. 2006AA09Z316);the National Natural Science Foundation of China (Nos. 40974071, 50904053);the Natural Science Foundation of Hubei Province (No. 2010CDA056)

摘　　要：In order to ensure safe drilling in deep water and marine gas hydrate bearing sediments, the needed characteristics of drilling fluid system were analyzed. Moreover, the effect of different agents on hydrate formation and the low-temperature rheology of designed polyalcohol drilling fluid were tested, respectively. The results show that clay can promote gas hydrate growth, while modified starch and polyalcohol can inhibit hydrate formation to some extent, and PVP K90 has a good performance on hydrate inhibition. The influence of clay on low-temperature rheology of polyglycols drilling fluid is notable. Therefore, the clay-free polyalcohol drilling fluid is suitable for deep water and marine gas hydrate drilling under optimal conditions.In order to ensure safe drilling in deep water and marine gas hydrate bearing sediments, the needed characteristics of drilling fluid system were analyzed. Moreover, the effect of different agents on hydrate formation and the low-temperature rheology of designed polyalcohol drilling fluid were tested, respectively. The results show that clay can promote gas hydrate growth, while modified starch and polyalcohol can inhibit hydrate formation to some extent, and PVP K90 has a good performance on hydrate inhibition. The influence of clay on low-temperature rheology of polyglycols drilling fluid is notable. Therefore, the clay-free polyalcohol drilling fluid is suitable for deep water and marine gas hydrate drilling under optimal conditions.

关 键 词：deep water marine gas hydrate polyalcohoi drilling fluid hydrate inhibition low-temperature rheology. 

分 类 号：P618.13[天文地球—矿床学] TE254.1[天文地球—地质学]