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首页> 外文期刊>Journal of Petroleum Science & Engineering >Novel hydraulic fracturing fluids with improved proppant carrying capacity and pH-adjustable proppant deposition behavior
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Novel hydraulic fracturing fluids with improved proppant carrying capacity and pH-adjustable proppant deposition behavior

机译：具有改善的支撑剂承载能力和可调节pH值的支撑剂沉积行为的新型水力压裂液

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In hydraulic fracturing, the design of the fracturing fluids is a crucial step in optimizing the effectiveness of hydrocarbon recovery. Herein, we describe a supramolecular dispersion with highly adjustable, reversible viscosity behavior, enabling control over the mobility, settling, and deposition of proppants. The supramolecular dispersion was obtained by complexation of an amino amide and maleic acid in an aqueous solution. The Theological properties of the developed fracturing fluid involving this supramolecular solution and proppant (silica sand) were characterized by frequency sweep and tixotropy tests, and settling studies. It was found that for a 2 wt% dispersion, viscosity at zero shear rate could be adjusted by a factor of 1600 by changing pH from 3.8 to 8.3 in a reversible fashion. Settling studies revealed that the sedimentation velocity of sand particles decreased by five orders of magnitude from 2.3 x 10 (-3) m/s to 5.3 x 10(-8) m/s upon an increase in pH from 4 to 8 in a reversible manner. Moreover, the supramolecular solution was found to maintain the Theological integrity even at NaCl concentrations above those of seawater. The significant reduction in the rate of proppant sedimentation and enhancement in the sedimentation stability were ascribed to the increased viscosity and the intermolecular and interparticle interactions between proppant and microscale networks and entanglements. In summary, supramolecular assembly of an amino amide and maleic acid has a potential to be effective fracturing fluids due to its highly pH adjustable viscosity and proppant carrying capacity, reliability at high salinities, and availability of its bio-based precursors in a sustainable manner. (c) 2016 Elsevier B.V. All rights reserved.
机译：在水力压裂中，压裂液的设计是优化烃采收效率的关键步骤。在本文中，我们描述了具有高度可调节的，可逆的粘度行为的超分子分散体，其能够控制支撑剂的迁移率，沉降和沉积。超分子分散体是通过使氨基酰胺和马来酸在水溶液中络合而获得的。通过频率扫描和触变性测试以及沉降研究，对涉及该超分子溶液和支撑剂（硅砂）的压裂液的流变学特性进行了表征。发现对于2重量％的分散体，通过以可逆的方式将pH从3.8改变为8.3，可以将零剪切速率下的粘度调节至1600倍。沉降研究表明，随着pH值从4增大到8，可逆性沙粒的沉降速度从2.3 x 10（-3）m / s降低到5.3 x 10（-8）m / s 5个数量级。方式。而且，发现即使在高于海水的NaCl浓度下，超分子溶液也保持了神学的完整性。支撑剂沉降速率的显着降低和沉降稳定性的提高归因于粘度的增加以及支撑剂与微尺度网络和缠结之间的分子间和粒子间相互作用。总而言之，由于氨基酰胺和马来酸的超分子组装具有高pH可调粘度和支撑剂承载能力，高盐度下的可靠性以及其可持续的生物基前体的可用性，因此有可能成为有效的压裂液。 （c）2016 Elsevier B.V.保留所有权利。

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