New Technique For Determining San Bank Geometry In Vertical Fractures Provides For A More Effective Stimulation Design

This paper presents the development and application of new techniques for predicting the sand bank geometry created by relatively thin, non-complexed fluids in fluids in vertical fractures. The theory utilizes the concept of equilibrium velocity combined with fracturing fluid efficiency. The development includes the effects of variable fluid leakoff along the extent of the fracture face due to sand bank build-up and also the effects of the sand bank on the fluid velocity profile along the fracture face. It is found that the slope of the sand bank decreases exponentially with penetration resulting in a bank that is shaped like an airfoil. The effects on controlling stimulation parameters such as fluid pumping rate, fluid loss, and equilibrium velocity are discussed as they pertain to sand bank geometry control. Finally, the implications of the sand bank geometry on more effective stimulation design are discussed.