文章摘要
部分枝化粘弹性颗粒溶液增粘性能及抗剪切性能研究
Research on the tackifying and shear-resistant properties of partially branched viscoelastic particle solution
投稿时间:2018-07-11  修订日期:2018-09-11
DOI:
中文关键词: 部分枝化粘弹性颗粒,增粘性能,抗剪切性能,微观结构
英文关键词: Partially branched viscoelastic particles  Tackifying performance  Shear resistance  Microstructure
基金项目:中国科学院重大资助项目
作者单位E-mail
祝仰文 中国石油化工股份有限公司胜利油田分公司勘探开发研究院 dzyzyw@163.com 
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中文摘要:
      通过多点引发反应,将丙烯酰胺、交联剂、支撑剂共聚制备部分枝化粘弹性颗粒(B-PPG)。交联的支链大分子溶解于水相,且形成的网状结构吸水溶胀,使B-PPG具有较强弹性的同时也具有增粘能力。但是,由于B-PPG在多孔介质渗流过程中受到较大的剪切作用,使得体系粘度发生明显降低。本文使用机械剪切和模拟射孔孔眼(炮眼)剪切方法,研究了B-PPG在不同剪切强度作用下溶液粘度保留率。研究结果表明,B-PPG具有较高的抗剪切能力,机械剪切后的粘度保留率均大于50%,模拟射孔孔眼剪切后的粘度保留率均大于20%。利用原子力显微镜对B-PPG微观结构进行表征,发现两种剪切条件下B-PPG原有的交联网络结构均有不同程度地破坏,从微观上解释了部分枝化粘弹性颗粒溶液剪切后粘度和粘弹性变化的原因。
英文摘要:
      Partially branched viscoelastic particles were prepared by copolymerization of acrylamide, crosslinking agent and proppant through multi-point initiation reaction, whose crosslinked macromolecules dissolved in aqueous phase, and the net structure formed by partially crosslinking is swelled after absorbing water, making B-PPG have strong elasticity and tackifying ability at the same time. However, the B-PPG’s viscosity decreases obviously due to the shear in porous media. In this paper, the viscosity retention rate of B-PPG solution under low and high speed shear was studied by mechanical shear and simulated perforating hole shearing. The results show that B-PPG has high shear resistance, the viscosity retention rate of mechanical shear is larger than 50%, and the viscosity retention rate of simulated perforation is more than 20%. Characterization of B-PPG’s microstructure was studied by atomic force microscope. It shows that the original crosslinking network structure of B-PPG was destroyed to some extent under two shear conditions. The changes of viscosity and viscoelasticity after shearing of partially branched viscoelastic particle solution are explained from the microcosmic point of view.
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