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Qualitative Endoscopic Observation of Hydraulic Fractures to Investigate the Effect of Fluid Viscosity

机译：水力压裂的内镜定性观察以研究流体粘度的影响

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The control of induced fracture network generated by hydraulic fracturing treatment plays an important role in predicting the productivity of hydrocarbon resources. In particular, both nature of pressurized injection fluid and in-situ stress condition significantly affect the formation of fracture network. The previous studies have mostly reported qualitative tendency of fracturing mechanism and its manifestation that are partially understood by numerical and experimental results. To better understand the effect of fluid viscosity, a series of experimental tests are systematically performed with cylindrical specimen under axisymmetric condition. The artificially made specimens with cement paste and mortar ensure the homogeneity and isotropy for experimental consistency. Water and oil are served as fracturing fluids at constant pumping rate. The monitoring of stress evolution with increasing pressurization and high-resolution optical endoscopy imaging together allow assessing the morphological characteristics of generated fracture.
机译：水力压裂处理产生的诱导裂缝网络的控制在预测烃类资源的生产中起着重要的作用。特别是，加压注入流体的性质和原位应力条件都会显着影响裂缝网络的形成。以往的研究大多报道了压裂机理及其表现的定性趋势，其数值和实验结果可以部分理解这一点。为了更好地理解流体粘度的影响，在轴对称条件下，对圆柱试样进行了一系列的实验测试。用水泥浆和砂浆人工制作的标本可确保均一性和各向同性，以确保实验的一致性。水和油以恒定的抽速用作压裂液。通过增加的压力和高分辨率的光学内窥镜成像对应力的变化进行监测，可以评估所产生裂缝的形态特征。

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