脉冲纤维压裂液携砂机理

Research on aand-carrying mechanism of fiber-based fracturing fluid

郭建春 高阳 赵志红 马健

GUO Jianchun GAO Yang ZHAO Zhihong MA Jian

西南石油大学油气藏地质及开发工程国家重点实验室

State Key Laboratory of Oil &

纤维压裂液携砂性能在很大程度上取决于压裂液流变性和微观结构。为了深入认识纤维压裂液携砂机理，通过室内实验观测纤维的分散性，研究纤维- 瓜胶基液的流变性能，并利用电镜扫描研究了纤维- 瓜胶基液的微观结构。研究结果表明： 纤维在瓜胶基液中能够均匀分散；纤维- 瓜胶基液符合幂律流变模型，纤维能够有效提高瓜胶基液黏度，增大瓜胶基液结构强度及内摩擦力，20 ℃时0.4% 纤维加量可将瓜胶基液黏度由32.496 mPa·s 提高到129.009 mPa·s，并在温度升高的情况下仍具有较高的黏度和结构强度；纤维- 瓜胶基液能够形成一定的网状结构并加强对支撑剂的束缚携带作用。研究结果可为后续理论研究和现场应用提供参考。

The sand-carrying capacity of fiber fracturing fluid largely depends on its rheological property and microstructure. For the purpose of further understanding the sand-carrying mechanism of fiber fracturing fluid, fiber dispersion was observed and rheological property of fiber-guar gum base fluid was studied through laboratory tests, and the microstructure of fiber-guar gum base fluid was studied through scanning electron microscope (SEM). The research result shows: fiber is evenly dispersed in guar gum base fluid; fiber-guar gum base fluid is conforming to rheological model of power law; fiber can improve the viscosity and enlarge the structural strength and internal friction of guar gum base fluid effectively; at 20 ℃, 0.4% fiber dosage can increase the viscosity of guar gum base fluid to 129.009 mPa·s from 32.496 mPa·s, and even if the temperature rises, viscosity and structural strength of guar gum base fluid can still be kept high; fiber-guar gum base fluid can form a reticular structure and enhance the bounding and carrying capacity to proppant. Moreover, the research result can be used as a reference for the follow-up theoretical research and field application.

10.13639/j.odpt.2016.01.018