基于非共价键相互作用的可自愈合凝胶随钻堵漏剂
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国家自然科学基金重点支持项目“深海深井钻井液漏失机理与防治方法研究”(项目编号U23B2082)


Self-healing Gel Based on Synergistic Multiple Non-covalent Bonds as Plugging Agent during Drilling
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    摘要:

    针对常规吸水膨胀类凝胶不能再次交联,受压力波动易被带出漏层,承压能力降低导致堵漏效果差的问题,以壳聚糖为物理交联剂,与丙烯酰胺(AM)、丙烯酸(AA)和甲基丙烯酸十八烷基酯(SMA)等单体聚合,制得自愈合凝胶。通过红外光谱、热重分析、扫描电镜表征了自愈合凝胶的结构,考察了其膨胀性、流变力学、自愈合性能、配伍性和封堵性等,分析了凝胶自愈合和封堵机理。结果表明,该凝胶具有海绵状双网络结构,凝胶结构之间存在多重非共价键作用(氢键作用、静电作用和疏水缔合作用)。自愈合凝胶的吸水膨胀性良好,随着温度的升高凝胶的吸水膨胀性能增强,120 ℃下凝胶的溶胀平衡值是常温的37倍。基于多重非共价键相互作用的凝胶颗粒在 90 ℃下自愈合后具有较高的储能模量(3500 Pa)和凝胶结构恢复率(83%),在 120 ℃下仍能表现出自愈合性能。凝胶颗粒与基浆的配伍性较好,随凝胶颗粒的增加,基浆的表观黏度增大,滤失量降低。当凝胶颗粒质量体积比达到2%时,可以满足20目(0.85 mm)以上砂粒模拟的孔隙性漏失地层的随钻堵漏需求。凝胶的自愈合机理主要依赖于其网络结构中的非共价键,这些键在凝胶受到破坏后能迅速断开并快速重新组合,从而恢复凝胶的完整性和功能性。在封堵机理方面,凝胶颗粒在漏失通道中通过运移、堆积和挤压,与地层形成紧密接触,并通过非共价键作用实现自愈合和与地层的紧密结合,形成强韧的凝胶封堵层。这种自愈合凝胶在提高随钻堵漏效率方面展现出应用潜力。

    Abstract:

    Conventional water-swelling gels lack re-crosslinking ability,making them susceptible to displacement from loss zones under pressure fluctuations,which reduces their pressure resistance and leads to poor plugging performance. Aiming at these problems,a self-healing gel was synthesized using chitosan as a physical crosslinker,combined with acrylamide(AM),acrylic acid(AA)and stearyl methacrylate(SMA)monomers. The gel’s structure was characterized through infrared spectroscopy, thermogravimetric analysis and scanning electron microscopy. Its swelling capacity,rheological properties,self-healing ability, compatibility with base fluid,and plugging performance were also investigated. Furthermore,the self-healing mechanism and plugging mechanism of the gel were analyzed. The results showed that the gel exhibited a spongy dual-network structure,with multiple non-covalent interactions including hydrogen bonding,electrostatic forces and hydrophobic associations within the network. The gel showed excellent water-swelling properties, which enhanced with increasing temperature. The swelling equilibrium value at 120 ℃ was 37 times higher than that at room temperature. After self-healing at 90 ℃,the gel particles exhibited a high storage modulus(3500 Pa)and a structural recovery rate(83%),while maintainined self-healing properties at 120 ℃. The compatibility between gel particles and base fluid was good. As the concentration of gel particles increased,the apparent viscosity of base fluid rose,while the fluid loss decreased. At a mass-volume ratio of 2%,the gel could meet the plugging requirements during drilling porous loss zones with simulated sand particles greater than 20 mesh(0.85 mm). The self-healing mechanism of gel primarily relied on non-covalent bonds in its network structure,which broke and re-formed rapidly after damage, restoring the gel’s integrity and functionality. In terms of plugging mechanism,the gel particles migrated,accumulated and compressed within the loss channels,forming tight contact with the formation. The non-covalent interactions enabled self-healing and strong bonding with the formation,creating a durable gel-plugging layer. This self-healing gel showed potential application in enhancing drilling fluid loss control.

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郭春萍,蒋官澄,管金田,郭 友,贺垠博,杨丽丽,董腾飞.基于非共价键相互作用的可自愈合凝胶随钻堵漏剂[J].油田化学,2024,41(4):571-578.
GUO Chunping, JIANG Guancheng, GUAN Jintian, GUO You, HE Yinbo, YANG Lili, DONG Tengfei. Self-healing Gel Based on Synergistic Multiple Non-covalent Bonds as Plugging Agent during Drilling[J]. OILFIELD CHEMISTRY,2024,41(4):571-578.

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  • 在线发布日期: 2025-01-12
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