聚合物钻井液防塌机理的试验研究

Experimental Research on the Instability Prevention Mechanism of Polymer Drilling Fluid

在试验研究的基础上对比了无机聚合物硅酸盐和有机聚合物———聚乙烯醇(PVA)、部分水解聚丙烯酰胺(PHPA)、非水解聚丙烯酰胺(PAM)和聚丙烯酸钾防塌能力的大小;由试验得出吸附成膜速度的快慢和保护膜的致密程度是决定钻井液体系防塌能力的关键因素;钻井液体系的防塌能力是无机聚合物和有机物质协同作用的结果;部分水解聚丙烯酰胺钻井液体系的防塌能力较非水解聚丙烯酰胺钻井液体系的防塌能力强;Na-CMC和PHP的加入可提高吸附膜的致密性及体系的防塌能力。

Based on the experiment research, it was compared that the inorganic polymer silicate with organic polymer such as polyvinyl alcohol （PVA）, partially hydrolyzed polyacrylamidc （PHPA）, polyacrylamide （PAM） and kalium polyacrylate on the capability of instability prevention. The conclusion was drawn as following from the experiment. Firstly, the velocity of the film forming by adsorption and density of the protective foil were the key factors to determine the IPC （ instability prevention capability） of the drilling fluid systems; secondly, the IPC of the drilling fluid systems was the result of synergistic action of the inorganic and organic polymers; thirdly, the IPC of PHPA drilling fluid system was better than PAM drilling fluid ; finally, the addition of Na - CMC and PHPA could increase the density of the adsorbed f＇dm and improve the IPC of the system.