石油学报 ›› 2014, Vol. 35 ›› Issue (4): 771-778.DOI: 10.7623/syxb201404021

• 石油工程 • 上一篇    下一篇

疏水缔合聚合物/纳米二氧化硅降滤失剂的研制及作用机理

毛惠, 邱正松, 沈忠厚, 黄维安, 钟汉毅   

  1. 中国石油大学石油工程学院 山东青岛 266580
  • 收稿日期:2014-01-11 修回日期:2014-05-28 出版日期:2014-07-25 发布日期:2014-08-05
  • 通讯作者: 邱正松,男,1964年9月生,1985年获华东石油学院学士学位,2001年获中国石油大学(华东)博士学位,现为中国石油大学(华东)石油工程学院教授、博士生导师,主要从事油气井工作液的研究。Email:qiuzs63@sina.com
  • 作者简介:毛 惠,男,1987年10月生,2010年获中国石油大学(华东)学士学位,现为中国石油大学(华东)石油工程学院油气井工程专业博士研究生,主要从事油气井工作液的研究。Email:maohui01@163.com
  • 基金资助:

    国家重大科技专项“大位移井强抑制、高润滑水基钻井液技术研究”(2011ZX05021-004)、中国石油大学(华东)自主创新科研计划项目“改性纳米二氧化硅聚合物降滤失剂的研制”(14CX06028A)和山东省博士后创新项目“纳米胺类树枝状聚合物页岩抑制剂研制及其作用机理研究”(201303060)资助。

Synthesis and mechanism of hydrophobic associated polymer based nano-silica filtrate reducer

Mao Hui, Qiu Zhengsong, Shen Zhonghou, Huang Wei'an, Zhong Hanyi   

  1. College of Petroleum Engineering, China University of Petroleum, Shandong Qingdao 266580, China
  • Received:2014-01-11 Revised:2014-05-28 Online:2014-07-25 Published:2014-08-05

摘要:

以制备的疏水缔合聚合物聚P(AM-NaAMPS-MA-b-St)为聚合物基体,纳米二氧化硅为填料,研制了一种具有核壳结构的疏水缔合聚合物/纳米二氧化硅微纳米降滤失剂FLR-1。借助FT-IR、SEM、TEM、粒径分布与比表面积测试和GPC实验,表征了FLR-1的分子结构、微观形貌特征和相对分子质量。通过API滤失和HTHP滤失实验测试了FLR-1的降滤失性能,探讨了其在水基钻井液中的降滤失作用机理。结果表明:新研制的疏水缔合聚合物/纳米二氧化硅降滤失剂有优异的降滤失作用,尤其是HTHP降滤失效果显著,200℃/16 h的HTHP滤失量仅为20.5 mL;此外,FLR-1也可显著改善钻井液体系的流变性能,且具有优良的抗盐能力。在高温高压环境下,具有独特微交联结构的FLR-1分子通过化学吸附作用、水化作用、疏水缔合作用及微纳米粒子自组装作用,能较好地稳定钻井液液相黏度,合理保持钻井液中固相粒子的粒径分布,形成薄而致密的泥饼,从而有效控制钻井液的HTHP滤失量。

关键词: 降滤失剂, 钻井液, 疏水缔合聚合物, 纳米二氧化硅, 降滤失作用机理, 聚合物纳米材料

Abstract:

A hydrophobic associated polymer nano-silica filtrate reducer FLR-1 with core-shell structure was synthesized using the matrix of block hydrophobic associated polymer P (AM-NaAMPS-MA-b-St) and the filler of nano-silica. The molecule structure, micro-morphological features, and relative molecular weight of FLR-1 were analyzed using FT-IR, SEM, TEM, particle size distribution, and specific surface area analysis combined with GPC experiment. The filtrate reduction property of FLR-1 was further tested via API filtration and HTHP filtration experiments, and the filtration reduction mechanism of FLR-1 in water based mud was finally discussed. The results show that the newly synthesized FLR-1 has excellent filtrate reduction property, with an especially significant effect for HTHP filtrate reduction (HTHP filter loss of 200℃/16 h is 20.5 mL only). Additionally, FLR-1 significantly improves the rheological properties of drilling fluid system and possesses strong saline-alkaline tolerance. At high temperature and high pressure, FLR-1 molecule with special cross-linked structure stabilizes the drilling mud viscosity and keeps the solid particle size distribution reasonably through chemical adsorption, hydration, hydrophobic association, and nano-particle self-assembly. In this way, thin and compact mud cakes are formed, thereby efficiently controlling the HTHP filter loss.

Key words: filtrate reducer, drilling fluid, hydrophobic associated polymer, nano-silica, filtration reduction mechanism, polymer based nano-composite

中图分类号: