文章摘要
一种酸性压裂液有机锆交联剂的合成与性能评价
Synthesis and evaluation of an organic zirconium cross-linker used in acidic fracturing fluid
投稿时间:2020-04-12  修订日期:2020-06-22
DOI:
中文关键词: 酸性压裂液  正交合成实验  有机锆交联剂  羧甲基羟丙基瓜胶  Sydansk瓶试法
英文关键词: acidic fracturing fluid  orthogonal experiment  organic zirconium cross-linker  CMHPG  Sydansk bottle-testing method
基金项目:“十三五”国家科技重大专项课题“低渗—致密油藏高效提高采收率新技术”(2017ZX05009-004)。
作者单位E-mail
张楷雨 中国石油大学(北京)非常规油气科学技术研究院 zhang_kaiyu@outlook.com 
侯吉瑞 中国石油大学(北京)非常规油气科学技术研究院  
李卓静 中国石油大学(北京)石油工程学院  
张国栋 中国石油大学(北京)非常规油气科学技术研究院  
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中文摘要:
      本文通过正交合成实验,以氧氯化锆、乙二醇、乳酸及氯化铵为原料,成功合成并筛选出可在酸性条件下(pH=1~6)与羧甲基羟丙基瓜胶(CMHPG)交联的有机锆交联剂。通过Sydansk瓶试法、应力控制型流变仪、静态悬砂与破胶实验、储层损害实验以及扫描电子显微镜,系统地评估了有机锆交联CMHPG酸性压裂液体系的成胶时间、成胶强度、流变性能、悬砂和破胶性能、渗透率恢复性能以及微观结构。结果表明:该有机锆交联剂具有优异的延迟交联性能,即使体系pH低至1~2,成胶时间依然可延缓至1~3 min;随着交联剂与聚合物浓度的升高,体系成胶时间缩短,成胶强度增大;在交联剂用量0.03~0.06%、聚合物用量0.2~0.7%的范围内,体系粘弹性能可调、成胶时间可控,可满足不同地层条件的压裂需要,但体系应用的温度范围应不超过145 ℃;剪切速率扫描测试表明,体系具有较好的剪切恢复性能;体系可形成均匀、致密的三维空间网状结构,且在pH为1~3的条件下,悬砂性能优异、破胶性能良好;相比于碱性压裂液体系,酸性压裂液体系具有更好的渗透率恢复性能。研究成果可为该酸性压裂液体系在现场中的应用提供一定的理论与数据支撑。
英文摘要:
      A novel organic zirconium cross-linker was synthesized and screened through orthogonal design experiments based on zirconium oxychloride, ethylene glycol, lactic acid, and ammonium chloride. The synthesized cross-linker can be cross-linked with carboxymethyl hydroxypropyl guar under acidic condition ranging from pH 1 to 6. The gelation time, gel strength, rheological performance, proppant-settling and gel breaking performance, return permeability performance, and microstructure of the zirconium-CMHPG crosslinked gel acidic fracturing fluid were systematically evaluated through Sydansk bottle-testing method, controlled stress rheometer, static proppant-settling and gel breaking tests, formation damage tests, and SEM. The results show that the delay performance of the organic zirconium cross-linker is desirable with the gelation time of 1 to 3 min even at a low pH of 1 to 2; the gelation time shortens and gel strength increases with the polymer and cross-linker concentrations; the gelation time and rheological performance of the gel system can be optimized at the polymer concentration of 0.2 to 0.7% and the cross-linker concentration of 0.03 to 0.06% to meet the specific fracturing operations; the temperature range, within which the gel system will apply, should be less than 145 ℃; the shear-sweep tests reveal that the gel system has a desirable shear recovery performance; a uniform and compact 3D network structure is generated within the gel, and the proppant-settling and gel breaking performance are satisfied at the pH of 1 to 3; the low pH fracturing fluid system produces a better return permeability than the high pH system. The research results can provide some theoretical and data support for the application of the acidic fracturing fluid system in the field.
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