超支化聚合物HP-NH2的合成及防塌机理研究  

A Study on Anti-collapse Mechanism and Synthesis of Hyperbranched Polymer HP-NH

作　　者：魏云锦 黄学刚 邹源红 徐伟宁 谢刚[3] WEI Yunjin;HUANG Xuegang;ZOU Yuanhong;XU Weining;XIE Gang(Development Division,Southwest Oil and Gas Field Company,PetroChina,Chengdu,Sichuan 610000,China;Gas Field Development Management Department,Southwest Oil and Gas Field Company,PetroChina,Chengdu,Sichuan 610000,China;Petroleum Engineering School,Southwest Petroleum University,Chengdu,Sichuan 610500,China)

机构地区：[1]中国石油西南油气田公司开发事业部,四川成都610000 [2]中国石油西南油气田公司气田开发管理部,四川成都610000 [3]西南石油大学石油与天然气工程学院,四川成都610500

出　　处：《西南石油大学学报（自然科学版）》2021年第4期99-108,共10页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：中国石油-西南石油大学创新联合体科技合作项目(2020CX040201);中国石油西南油气田公司开发事业部项目(XNS开发部JS2020-04)。

摘　　要：井壁稳定是当前水基钻井液钻深层页岩气的技术难点。以二乙烯三胺和N,N-亚甲基双丙烯酰胺为原料,通过迈克尔加成反应合成了超支化聚合物HP-NH_(2)。采用红外光谱法、液相色谱-质谱联用法、凝胶色谱法、粒度分析法和热失重分析法表征了HP-NH_(2)的结构和特征。研究发现,HP-NH_(2)的数均分子量为3371 g/mol,多分散指数为2.7,分子量分布较宽,粒径280~1900 nm,抗温能力达到280℃。通过线性膨胀实验、回收率实验、泥饼分散实验和"人造泥饼"法分析了HP-NH_(2)作为防塌剂的防塌性能。研究表明,随着HP-NH_(2)浓度的增加,膨润土的线性膨胀率逐渐降低(最低为19.11%),岩屑的滚动回收率逐渐升高(最高为75.18%),人造泥饼的渗透率逐渐下降。小分子HP-NH_(2)能够插入蒙脱石的晶层间,交换出层间易水化的阳离子,拉紧基底间距,抑制蒙脱石的水化分散;大分子HP-NH_(2)能有效封堵泥饼的微纳米孔缝,起到一剂多用的功效。因此,HP-NH_(2)可作为一种潜在的一剂多用防塌剂应用于水基钻井液体系。Wellbore stability is the current technical difficulty in drilling deep shale gas with water-based drilling fluids.Using diethylenetriamine and N,N-methylenebisacrylamide as raw materials,the hyperbranched polymer HP-NH_(2) was synthesized by Michael addition reaction.The structure and characteristics of the hyperbranched polymer HP-NH_(2) were characterized by infrared spectroscopy,liquid chromatography-mass spectrometry,gel chromatography,particle size analysis and thermal weight loss analysis.The study found that the number average molecular weight of the hyperbranched polymer HP-NH_(2) was 3371 g/mol,the particle size was in the range of 280~1900 nm,and the temperature resistance reached 280℃.Through the artificial mud cake method,linear expansion experiment,recovery rate experiment and mud cake dispersion experiment,the anti-collapse performance of hyperbranched polymer HP-NH_(2) as an anti-collapse agent was analyzed.We found that with the increase of HP-NH_(2),the linear expansion rate of bentonite gradually decreased(the lowest was 19.11%),the rolling recovery rate of cuttings gradually increased(the highest was 75.18%),and the permeability of the artificial mud cake gradually declined.Hyperbranched polymer HP-NH_(2) can be inserted between the crystal layers of montmorillonite to exchange cations that are easily hydrated between the layers,tighten the substrate spacing,and inhibit the hydration and dispersion of montmorillonite;HP-NH_(2) can also effectively block mud cake’s micro-nano pores.Therefore,the hyperbranched polymer HP-NH_(2) can be used as a potential anti-coll apse agent in water-based drilling fluid systems.

关 键 词：防塌剂 超支化聚合物 抑制性能 封堵性能 防塌机理 

分 类 号：TE254[石油与天然气工程—油气井工程]