Analyzing the Mechanisms of the “Recovery” of Association Fracturing Fluids Viscosity by Molecules Self-assembly
-
摘要: 近些年,通过疏水缔合聚合物与表面活性剂复配所形成的具有"超分子结构"的缔合体系,被作为新型清洁压裂液已有相关的报道。绝大多数文章关注稠化剂的研发和性能评价,对这种缔合压裂液体系的成网机理、剪切"回复性"机理等基础研究较少。通过变剪切流变实验、环境扫描电镜、支撑剂悬浮实验,对缔合压裂液体系的成网机理、剪切"回复性"机理进行了分析研究,从可视化的角度直观地分析并阐述了分子自组装对缔合压裂液体系表观黏度"回复"的作用。分析研究结果表明,缔合压裂液的"空间网络状结构"是通过疏水支链与表面活性剂"共用"胶束、疏水缔合聚合物分子间缔合和分子间缠绕的方式形成的;剪切作用撤销以后,拆散了的表面活性剂自组装成新的"胶束"并与剪碎了的疏水缔合聚合物的疏水支链,重新自组装形成新"网络状结构";分子层间的"滑移"作用,使缔合压裂液体系新"网络状结构"处于一种"动态平衡"状态,并以新构建的"网络状结构"悬浮支撑剂。Abstract: In recent years, reports have been found of new clear fracturing fluids, a liquid system with "supramolecular structure" formulated with hydrophobically associating polymers and surfactants. Most of the reports have focused on the development and performance evaluation of the polymeric thickeners, while the mechanisms of forming molecular network and regaining viscosity through shearing of the fracturing fluids have rarely been studied. To study the mechanisms mentioned above, varied shearing rheology experiment, environmental scanning electron microscope (ESEM) experiment and proppant suspending experiment have been conducted, and the effects of molecules' self-assembly on the two mechanisms have been visually analyzed and explained. The analytical results demonstrated that the "spatial networking structure" of the association fracturing fluid is formed through the "shared" micelles between hydrophobic molecular side-chains and surfactant molecules, inter-molecular association and inter-molecular entanglement of the hydrophobically associating polymer. When shearing of the fracturing fluid is stopped, the shear-broken surfactant molecules will form new "micelles" through self-assembly, and further re-form new "networking structure" with the hydrophobic side-chains of the shear-broken hydrophobically associating polymer. "Sliding movement" between two layers of molecules causes the new "networking structure" of the "association fracturing fluid" to be in a "dynamic equilibrium" state, and to suspend proppants with much tighter "networking structure".
-
[1] 叶仲斌.提高采收率原理(第二版)[M].北京:石油工业出版社,2011:52-83,174-177.YE Zhongbin.Principle of enhance oil recovery (second edition)[M].Beijing:Petroleum Industry Press,2011:52-83,174-177. [2] 罗平亚,郭拥军,刘通义,等.一种新型压裂液[J].石油与天然气地质,2007,28(4):511-515.LUO Pingya,GUO Yongjun,LIU Tongyi,et al.A novel fracturing fluid[J].Oil and Gas Geology,2007,28(4):511-515. [3] 祝成.清洁压裂液的配制及性能研究[M].成都:西南石油大学,2010.ZHU Cheng.Preparation and performance of the clear fracturing fluid research:[M].Chengdu:Southwest Petroleum University,2010. [4] 黄光稳.疏水缔合型聚丙烯酰胺与Gemini表面活性剂的合成及复配研究[M].长沙:湖南大学,2013.HUANG Guangwen.Research of hydrophobic association polyacrylamide and gemini surfactants synthesis and distribution[M].Changsha:Hunan University,2013. [5] JIANG Yang.Viscoelastic evaluation of gemini surfactant gel for hydraulic fracturing[C].SPE 165177. [6] 崔会杰,李建平,杜爱红,等.低分子量聚合物压裂液体系的研究与应用[J].钻井液与完井液,2013,30(3):79-81.CUI Huijie,LI Jianping,DU Aihong,et al.Research and application on low molecular weight polymer fracturing fluid system[J].Drilling Fluid &Completion Fluid,2013,30(3):79-81. [7] 林波,刘通义,谭浩波,等.新型缔合压裂液黏弹性控制滤失的特性研究[J].西南石油大学学报(自然科学版),2014,36(3):151-156.LIN Bo,LIU Tongyi,TAN Haobo,et al.Study on the property of controlling filtration by viscoelasticity of a new associated fracturing fluid[J].Journal of Southwest Petroleum University (Science &Technology Edition),2014,36(3):151-156. [8] 段贵府,胥云,卢拥军,等.耐超高温压裂液体系研究与现场试验[J].钻井液与完井液,2014,31(3):75-77.DUAN Guifu,XU Yun,LU Yongjun,et al.Study and field application of an ultrahigh temperature fracturing fluid[J].Drilling Fluid &Completion Fluid,2014,31(3):75-77. [9] 杨倩云,郭保雨,严波,等.黏弹性聚合物钻井液技术[J].钻井液与完井液,2014,31(3):6-9.YANG Qianyun,GUO Baoyu,YAN Bo,et al.Viscoelastic polymer drilling fluid technology[J].Drilling Fluid &Completion Fluid,2014,31(3):6-9. [10] 李志臻,杨旭,涂莹红,等.一种聚合物压裂液稠化剂的性能研究及应用[J].钻井液与完井液,2015,32(5):78-82.LI Zhizhen,YANG Xu,TU Yinghong,et al.Study on and application of a polymeric thickening agent for fracturing fluid[J].Drilling Fluid &Completion Fluid,2015,32(5):78-82. [11] 任占春,黄波,张潦源,等.油醇系浓缩缔合聚合物压裂液增稠剂的制备与应用[J].钻井液与完井液,2016,33(1):107-112.REN Zhanchun,HUANG Bo,ZHANG Liaoyuan,et al.Preparation and application of concentrated oleic alcohol association polymer thickening agent used in fracturing fluids[J].Drilling Fluid &Completion Fluid,2016,33(1):107-112. [12] 姬思雪,杨江,李冉,等.不同化学剂对缔合结构压裂液破胶的影响[J].钻井液与完井液,2016,33(1):122-126.JI Sixue,YANG Jiang,LI Ran,et al.Effect of chemicals on gel breaking of associative structure fracturing fluid[J].Drilling Fluid &Completion Fluid,2016,33(1):122-126. [13] KEVELAM J,VAN BREEMEN J F L,BLOKZIJL W,et al.Polymer-surfactant interactions studied titration microcalorimetry:influence of polymer drophobicity,electrostatic forces,and surfactant aggregational state[J].Langmuir,1996,12(20):4709-4717. [14] 李琴,崔岩,张万喜,等.分子自组装方法与应用研究[J].高分子材料科学与工程,2004,20(6):33-41.LI Qin,CUI Yan,ZHANG Wanxi,et al.Method and application of molecular self-assembly[J].Polymer Materials Science and Engineering,2004,20(6):33-41. [15] 苏晓渝,谢如刚.超分子自组装中的非共价键协同作用[J].化学研究与应用,2007,19(12):1304-1310.SU Xiaoyu,XIE Rugang.Cooperatic non-covalent interaction for supramolecular self-assembly[J].Chemical Research and Application,2007,19(12):1304-1310. [16] SHRESTHA R G,SHRESTHA L K,ARAMAKI K.Formation of wormlike micelle in a mixed aminoacid based anionic surfactant and cationic surfactant systems[J].Journal of Colloid and Interface Science,2007,311(1):276-284. [17] 周逸凝,崔伟香,杨江,等.一种新型超分子复合压裂液的性能研究[J].油田化学,2015,32(2):180-183.ZHOU Yining,CUI Weixiang,YANG Jiang,et al.Performanc evaluation of a novel supramolecular fracturing fluid[J].Oilfield Chemistry,2015,32(2):180-183. [18] 祝琦,蒋官澄,杨艳明,等.润湿性改变压裂液返排的影响[J].钻井液与完井液,2014,31(6):66-69.ZHU Qi,JIANG Guancheng,YANG Yanming,et al.Effect of wettability alteration on bacldiow of fracturing f1uid[J].Drilling Fluid &Completion Fluid,2014,31(6):66-69.
点击查看大图
计量
- 文章访问数: 523
- HTML全文浏览量: 115
- PDF下载量: 129
- 被引次数: 0