抗高温包被剂 PAAND的研制与性能评价

Preparation and Characteristic of Amphoteric Polymer as a High Temperature Resistant Coating Agent

蒋官澄 史亚伟 贺垠博 杨丽丽 崔物格 杨 潇

JIANG Guancheng SHI Yawei HE Yinbo YANG Lili CUI Wuge YANG Xiao

为了解决深井超深井钻进过程中水基钻井液包被剂抗温包被性能不足的问题，采用 NVP、AM、DMDAAC制得了抗高温包被剂 PAAND，优选最佳合成条件为：NVP、AM、DMDAAC质量比 1∶6∶3，AM水解度 60%，引发剂加量 0.1%，反应温度 55℃，反应时间 5 h。利用红外、热重、扫描电镜等手段对其结构性能与作用机理进行了分析，并对其包被性能进行了评价。研究结果表明：PAAND分解温度为 232℃，抗高温性性能优异，钻屑在 0.2%PAAND 水溶液中 180℃热滚一次滚动回收率与二次滚动回收率分别为 80.85%和 79.16%，动切力上升率低至164%，性能优于市面上常用的 KPAM 和 FA367。PAAND 通过多点吸附包被在钻屑表面，形成了聚合物“保护膜”，防止了钻屑与水分的直接接触。图 10表 4参 14

In order to improve the thermal resistance of the coating agent for water based drilling fluids，the amphoteric polymer as a high temperature resistant coating agent（PAAND）was synthesized through radical copolymerization using acrylamide（AM）、N-vinylpyrrolidone（NVP）and diallyldimethylammonium chloride（DMDAAC）as main raw materials. The optimum synthesis conditions were as follows：monomer mass ratio of AM to NVP to DMDAAC was 1∶6∶3，dosage of initiator was 0.1%，reaction temperature was 55℃，reaction time was 5 h and hydrolysis degree of AM was 60%. The structure and properties of the polymer were analyzed by infrared spectra analysis，thermogravimetric analysis and scanning electron microscopy，the coating properties were evaluated. The results showed that the decomposition temperature of PAAND was 232℃，and the coating properties of the PAAND at high temperature were excellent，the hot-rolling recovery rate and the second rolling recovery rate after 16 h at 180℃ being of 80.85% and 79.16% respectively，and the dynamic shear rate being as low as 164%. In a word，the coating properties of the PAAND at high temperature were better than that of KPAM and FA367 commonly used. The PAAND was coated on the surface of the cuttings by multi-point adsorption，forming a polymer "protective film" to prevent the direct contact between the cuttings and moisture.