水基钻井液用抗超高温聚合物刷润滑剂的研制  

Development of Ultra-high Temperature Polymer Brush Lubricant for Water Based Drilling Fluids

作　　者：高重阳 黄贤斌[1,2] 白英睿 孙金声 吕开河[1,2] 张瑜 宗嘉江 刘锋报[2,3] GAO Chongyang;HUANG Xianbin;BAI Yingrui;SUN Jinsheng;LYU Kaihe;ZHANG Yu;ZONG Jiajiang;LIU Fengbao(Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)),Ministry of Education,Qingdao,Shandong 266580;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580;PetroChina Tarim Oilfield Company,Korla,Xinjiang 841000)

机构地区：[1]非常规油气开发教育部重点实验室(中国石油大学(华东)),山东青岛266580 [2]中国石油大学(华东)石油工程学院,山东青岛266580 [3]中国石油塔里木油田分公司,新疆库尔勒841000

出　　处：《钻井液与完井液》2023年第4期453-461,共9页Drilling Fluid & Completion Fluid

基　　金：山东省重点研发计划“绿色高效井筒工作液关键材料研发及产业化”(2020ZX20210015)。

摘　　要：深部复杂地层油气钻探过程中,为了满足钻井液抗高温、抗盐的技术要求,以甲基丙烯酸甲酯、丙烯酸月桂酯、丙烯酸羟乙酯为主要原料,偶氮二异丁腈作为引发剂,制备了一种水基钻井液用聚合物刷润滑剂HLM。通过傅里叶红外光谱、核磁共振、热重分析和凝胶色谱分析对产物进行了表征。然后评价了HLM与钻井液的配伍性以及高温、高盐、高密度条件下的润滑性能,利用多功能材料表面性能测试仪和四球摩擦实验仪进一步分析了润滑性。实验结果表明,HLM的热稳定性较好,重均分子质量为3494;HLM在室温下与基浆配伍性良好,对流变性基本没影响,抗温可达260℃;加量2%时,常温下润滑系数降低率达91.16%,260℃老化后润滑系数降低率达88.24%;在饱和盐水基浆中润滑系数降低率为75.69%,在高密度基浆中润滑系数降低率大于40%。表面摩擦实验进一步证明了HLM可以大幅度降低金属-金属间的摩擦力,四球摩擦实验证明了HLM可在金属表面形成稳定的润滑膜。由于HLM具有多个吸附位点且吸附能力强,在高温、高盐条件下吸附膜仍具有一定的强度,因此赋予HLM良好的润滑性能。可为深层超深层钻井液体系的构建提供技术借鉴。During oil and gas drilling in deep complex formations,the technical requirements of high temperature and salt-resistance of drilling fluid should be met.In this paper,a polymer brush lubricant(HLM)for water-based drilling fluids was prepared using methyl methacrylate,lauryl acrylate and 2-hydroxyethyl acrylate as the main raw materials and 2-methylpropionitrile as the initiator.The HLM was characterized by means of Fourier infrared spectroscopy,nuclear magnetic resonance spectroscopy,thermogravimetric analysis and gel chromatography.The compatibility of HLM with drilling fluids and the lubricity performance of HLM under high temperature,high salt and high density conditions were evaluated.The lubricity was further analyzed using a multifunctional material surface performance tester and a four-ball friction tester.The experimental results showed that HLM had a good thermal stability with a weight average molecular mass of 3494.HLM had good compatibility with the bentonite-based mud at room temperature and had essentially no effect on rheology.The temperature resistance can reach 260℃.When concentration of HLM was 2%,the lubrication coefficient reduction rates were 91.16%under room temperature,88.24%after ageing at 260℃,75.69%for the saturated salt-based mud,and larger than 40%in the high-density drilling mud.The multifunctional material surface performance experiment further demonstrated that HLM could substantially reduce metal-to-metal friction.The four-ball friction experiment demonstrated that HLM could form a stable lubricating film on metal surfaces.Since HLM had multiple adsorption sites and strong adsorption capacity,the adsorption film still had high strength under high temperature and high salt conditions,giving HLM good lubricating properties.This paper can provide technical reference for the construction of drilling fluids for deep/ultra-deep formations.

关 键 词：水基钻井液 聚合物刷 润滑剂 高温 高盐 

分 类 号：TE254.4[石油与天然气工程—油气井工程]