CO2响应型清洁压裂液及其转变机理研究
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中国石化石油工程技术研究院

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国家自然科学基金重点项目(51834010);国家科技重大专项(2017ZX05023003-003);十三五”国家重大科技专项“低渗油气藏钻井液完井液及储层保护技术”(2016ZX05021-004-002


Laboratory Study of Construction and Recycling Mechanism ofCO2 Response Clean Fracturing Fluid System
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    摘要:

    为解决水力压裂返排液对储层的伤害和环境的污染,通过合成新型环境响应分子,并用其构筑可循环利用的清洁压裂液体系,对体系压裂液性能和循环利用性能进行评价,利用电子显微镜和分子动力学模拟从介-微观层面揭示该智能响应清洁压裂液体系的成胶-破胶可控机理,从而进一步优化体系并形成可应用于现场的可循环利用清洁压裂液体系。研究结果表明:成功合成出了具有良好的响应增黏性和水溶性的CO2响应型分子;用其制备的清洁压裂液体系通过环境刺激响应可根据需求智能成胶和破胶。分子动力学模拟及电镜揭示了体系囊泡和蠕虫状聚集体的形成及转变机理,探讨了分子聚集体的转变动力学,为现场应用提供指导。

    Abstract:

    In order to solve the reservoir damage and environmental pollution caused by hydraulic fracturing flowback fluid, a novel environmentally responsive molecule is synthesized and used to construct a recyclable clean fracturing fluid system, and the fracturing fluid performance and recycling performance of the system are evaluated. The gel formation - gel breaking controllable mechanism of the intelligent responsive clean fracturing fluid system is revealed from the medium-micro level by using an electron microscope and molecular dynamics simulation, so that the system is further optimized and a recyclable clean fracturing fluid system applicable to the field is formed. The results show that: CO2 responsive molecules with good viscosity increasing response and water solubility have been successfully synthesized; The clean fracturing fluid prepared by the method can intelligently form gel and break gel according to requirements through environmental stimulation response. Molecular dynamics simulation and electron microscopy revealed the formation and transformation mechanism of vesicles and helminth aggregates in the system, and discussed the transformation dynamics of molecular aggregates, providing guidance for field application.

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  • 收稿日期:2019-12-20
  • 最后修改日期:2020-01-25
  • 录用日期:2020-02-14
  • 在线发布日期: 2021-11-03
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