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Does Low‐Viscosity Fracturing Fluid Always Create Complex Fractures?
Journal of Geophysical Research: Solid Earth ( IF 3.9 ) Pub Date : 2020-09-07 , DOI: 10.1029/2020jb020332
Zhiqiang Chen 1 , Derek Elsworth 2 , Moran Wang 1
Affiliation  

Lower viscosity fluids are commonly believed to be able to create more complex fractures in hydraulic fracturing; however, the mechanism remains stubbornly unclear. We use a new grain‐scale model with accurate coupling of hydrodynamic forces to simulate the propagation of fluid‐driven fracturing. The results clarify that fracturing fluid with a lower viscosity does not always create more complex fractures. The heterogeneity in the rock exerts the principal control on systematic evolution of fracture complexity. In homogeneous rock, low viscosity fluids result in low breakdown pressure, but viscosity exerts little influence on fracture complexity. However, in heterogeneous rock, lower viscosity can lead to more complex network of fracturing. A regime map shows the dependence of fracture complexity on the degree of rock heterogeneity where low viscosity fracturing fluid more readily permeates weak defects and creates complex fracture networks.

中文翻译:

低粘度压裂液是否总是产生复杂的裂缝?

通常认为,较低粘度的流体能够在水力压裂中产生更复杂的压裂。但是,机制仍然顽固不清。我们使用新的粒度模型与流体动力的精确耦合来模拟流体驱动压裂的扩展。结果表明,粘度较低的压裂液并不总能产生更复杂的裂缝。岩石中的非均质性主要控制裂缝复杂性的系统演化。在均质岩石中,低粘度流体导致较低的破裂压力,但粘度对裂缝的复杂性影响很小。但是,在非均质岩石中,较低的粘度会导致更复杂的压裂网络。
更新日期:2020-09-16
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