丙烯酰胺-丙烯腈共聚物及其衍生物的页岩抑制性能研究

An Investigation into Shale Stability by Utilizing Copolymer of Acrylamide and Acrylonitrile and Its Derivatives

为了抑制因页岩水化膨胀而导致的井壁不稳定，往往在钻井液中添加页岩抑制剂。在弱控制条件下，采用正交试验方法研制了丙烯酰胺两烯腈共聚物及其水解产物；设计了部分水解共聚物的曼尼希反应及曼尼希反应产物的进一步季铵化；评价了各产物抑制页岩水化膨胀的性能。结果表明，丙烯酰胺丙烯腈共聚物及其衍生物对页岩的水化膨胀都有较强的抑制作用，尤其是季铵化产物的抑制性最好，０．６％季铵化产物的抑制率高达５４．１９％。这与其分子结构特性有关。

A swelling due to shale hydration is one of the most important reasons for borehole instability.Adding a shale stabilizer to drilling fluids is an effective way.The copolymer of acrylamide and acrylonitrile and its derivatives are prepared to be used as a shale hydration swelling retarder.Experimental results show that the inhibitors developed have good properties to inhibit shale hydration swelling,especially their quaternized product at concetration of 06% with inhibition rate up to 5419%,depending on its molecular structure.