超支化高分子水基钻井液仿生润滑机理  

Bionic lubricating mechanism of water-based drilling fluid with hyperbranched polymer

作　　者：许林 王晓棠 王晓亮[3,4] 胡南琪 许明标 韩银府[4] 位中伟 丁梓敬 XU Lin;WANG Xiaotang;WANG Xiaoliang;HU Nanqi;XU Mingbiao;HAN Yinfu;WEI Zhongwei;DING Zijing(School of Petrochemical Engineering&Environment,Zhejiang Ocean University,Zhoushan,Zhejiang 316022,China;School of Chemistry and Chemical Engineering,Queen's University Belfast,Belfast BT95AG,UK;School of Petroleum Engineering,Yangtze University,Wuhan,Hubei 430100,China;Jingzhou Jiahua Tech.Ltd.,Jingzhou,Hubei 434000,China)

机构地区：[1]浙江海洋大学石油化工与环境学院 [2]贝尔法斯特女王大学化学化工学院 [3]长江大学石油工程学院 [4]荆州嘉华科技有限公司

出　　处：《天然气工业》2024年第7期120-131,共12页Natural Gas Industry

摘　　要：随着定向钻井技术的发展,水基钻井液润滑性逐渐成为确保定向井钻进的关键指标,设计新型钻井液润滑材料已成为油田化学领域的研究热点和重点。为探究超支化高分子水基钻井液仿生润滑机理,首先采用发散法合成了第1.5代超支化聚丙烯酸乙二胺基丙烯酸十八酯G1.5 P(EDA—MA—OA),然后进行了合成产物结构、微观形貌与热稳定性检测及其强化水基钻井液润滑性能评价,最后系统分析了超支化高分子与膨润土粒子的吸附行为。研究结果表明:①G1.5 P是粒径分布在几十纳米的分散性粒子,具有良好的热稳定性,热解温度集中在214℃;②以G1.5 P为润滑添加剂,构建的水基钻井液润滑系数为0.068,具有良好降摩减磨性;③G1.5 P呈“分子刷”状吸附于亲水材料表面,不仅改变了表面润湿性,而且还可促进膨润土粒子聚结形成致密、韧性的泥饼;④基于超支化高分子强化水基钻井液润滑的构效关系,提出了一种水基钻井液边界—固体润滑新模型,即超支化高分子促进在钻具与井壁摩擦副间形成低剪切强度泥饼,以泥饼结构内摩擦代替钻具刚性外摩擦,实现钻井液降摩减磨功能。结论认为,该认识完善了水基钻井液润滑添加剂的设计思路,为新型高性能润滑处理剂设计及超滑水基钻井液的开发提供了理论与技术支撑。With the advancement of directional drilling technologies,the lubricity of water-based drilling fluids has gradually become the key factor to ensure the smooth implementation of directional drilling.Thus,designing novel drilling fluid lubricant has been taken as the research hotspot and focus in the field of oilfield chemistry.To explore the lubricating mechanisms of the water-based drilling fluid with hyperbranched polymer,this paper synthesizes the 1.5th generation of ethylenediamine-methyl acrylate-octadecyl acrylate hyperbranched polymer G1.5 P(EDA-MA-OA),in reference to the bionic lubrication theories.Then,its synthesized product structure,microscopic morphology and thermal stability are tested,and its ability to enhance the lubricity of water-based drilling fluid is evaluated.Finally,the adsorption behaviors of hyperbranched polymer and bentonite particle are analyzed systematically.And the following research results are obtained.First,G1.5 P is a kind of dispersed particle with a size of tens of nanometers and has good thermal stability with pyrolysis temperature concentrating at 214℃.Second,the water-based drilling fluid with G1.5 P as lubricating additive has the lubricity coefficient of 0.068,exhibiting prominent friction reduction and wear resistance.Third,G1.5 P is adsorbed on the surface of hydrophilic material in the form of"molecular brush",which not only changes the surface wettability,but also promotes the aggregation of bentonite particles to form compact and flexible mud cakes.Fourth,based on the lubrication enhanced structure-activity relationship of hyperbranched polymer drilling fluid,a boundary-solid lubrication model of water-based drilling fluid is newly proposed.It reveals that hyperbranched polymer promotes the formation of low shear strength mud cake between drill tool and borehole wall friction pairs,and the internal friction of mud cake replaces the rigid external friction of drill tool,thus achieving friction reduction and wear resistance of drilling fluid.In conclusion,the resear

关 键 词：水基钻井液 超支化高分子 润滑添加剂 摩擦副 边界—固体润滑 构效关系 分子刷 

分 类 号：TE254[石油与天然气工程—油气井工程]