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Low Molecular Weight Branched Polyamine as a Clay Swelling Inhibitor and Its Inhibition Mechanism: Experiment and Density Functional Theory Simulation
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-01-31 , DOI: 10.1021/acs.energyfuels.9b04003
Gang Xie 1 , Yurong Xiao 1 , Mingyi Deng 1 , Yujing Luo 1 , Pingya Luo 1
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-01-31 , DOI: 10.1021/acs.energyfuels.9b04003
Gang Xie 1 , Yurong Xiao 1 , Mingyi Deng 1 , Yujing Luo 1 , Pingya Luo 1
Affiliation
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The inhibition of clay surface hydration is a major hindrance for the use of water-based drilling fluids (WBDFs) in shale formations. In this work, a low molecular weight branched polyamine (BEN-5NH2) was synthesized and evaluated as a clay swelling inhibitor. The inhibition performance and rheological properties of the drilling fluids with BEN-5NH2 were investigated by a linear swelling test, hot-rolling recovery test, and rheological property test. The experimental results showed that BEN-5NH2 exhibited better inhibition performance than that of the other inhibitors. Moreover, BEN-5NH2 can balance the contradiction between the inhibition performance and rheological properties of the WBDFs. The inhibition mechanism of BEN-5NH2 was investigated by X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, X-ray photoelectron spectroscopy analysis, and density functional theory calculations. Based on the results, it was determined that BEN-5NH2 can enter the interlayer space of sodium montmorillonite (Na-Mt), minimize the d-spacing of Na-Mt, and maintain the d-spacing of Na-Mt with the increase in relative humidity value. BEN-5NH2 can replace the exchanged cations in the interlayer space of Na-Mt, remove the interlayer water, and thus completely inhibit interlayer surface hydration (zero-layer hydrate). The density functional theory simulation results showed that BEN-5NH2 can be strongly adsorbed on the active site of Na-Mt (001) surface through electrostatic interaction and lie flat on the Na-Mt (001) surface. Therefore, BEN-5NH2 is a promising clay swelling inhibitor with broad application prospects in water-based drilling fluids.
中文翻译:
低分子量支化多胺作为粘土膨胀抑制剂及其抑制机理:实验与密度泛函理论模拟
抑制粘土表面水合作用是在页岩地层中使用水基钻井液(WBDF)的主要障碍。在这项工作中,合成了一种低分子量的支链多胺(BEN-5NH 2),并作为粘土膨胀抑制剂进行了评估。通过线性溶胀试验,热轧恢复试验和流变性能试验研究了BEN-5NH 2对钻井液的抑制性能和流变性能。实验结果表明,BEN-5NH 2具有比其他抑制剂更好的抑制性能。此外,BEN-5NH 2可以平衡WBDFs的抑制性能和流变性之间的矛盾。BEN-5NH的抑制机理2通过X射线衍射,热重分析,扫描电子显微镜,X射线光电子能谱分析,和密度泛函理论计算的影响。根据结果,确定BEN-5NH 2可以进入蒙脱土钠(Na-Mt)的层间空间,使Na-Mt的d-间距最小化,并随着增加而保持Na-Mt的d-间距。相对湿度值。BEN-5NH 2可以替代Na-Mt层间空间中交换的阳离子,除去层间水,从而完全抑制层间表面水合(零层水合物)。密度泛函理论模拟结果表明,BEN-5NH 2可通过静电相互作用将其强烈吸附在Na-Mt(001)表面的活性部位上,并平放在Na-Mt(001)表面上。因此,BEN-5NH 2是一种有前途的粘土膨胀抑制剂,在水基钻井液中具有广阔的应用前景。
更新日期:2020-01-31
中文翻译:
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低分子量支化多胺作为粘土膨胀抑制剂及其抑制机理:实验与密度泛函理论模拟
抑制粘土表面水合作用是在页岩地层中使用水基钻井液(WBDF)的主要障碍。在这项工作中,合成了一种低分子量的支链多胺(BEN-5NH 2),并作为粘土膨胀抑制剂进行了评估。通过线性溶胀试验,热轧恢复试验和流变性能试验研究了BEN-5NH 2对钻井液的抑制性能和流变性能。实验结果表明,BEN-5NH 2具有比其他抑制剂更好的抑制性能。此外,BEN-5NH 2可以平衡WBDFs的抑制性能和流变性之间的矛盾。BEN-5NH的抑制机理2通过X射线衍射,热重分析,扫描电子显微镜,X射线光电子能谱分析,和密度泛函理论计算的影响。根据结果,确定BEN-5NH 2可以进入蒙脱土钠(Na-Mt)的层间空间,使Na-Mt的d-间距最小化,并随着增加而保持Na-Mt的d-间距。相对湿度值。BEN-5NH 2可以替代Na-Mt层间空间中交换的阳离子,除去层间水,从而完全抑制层间表面水合(零层水合物)。密度泛函理论模拟结果表明,BEN-5NH 2可通过静电相互作用将其强烈吸附在Na-Mt(001)表面的活性部位上,并平放在Na-Mt(001)表面上。因此,BEN-5NH 2是一种有前途的粘土膨胀抑制剂,在水基钻井液中具有广阔的应用前景。