Fracturing sand blocking mechanism and prevention technologies

Water is an important american sand fracturing stimulation of low permeability gas field, due to the high angle directional well completion, perforation orientation is inconsistent with thin decision to stress, fracturing layers crack direction, multi-layer structure interaction, make fractured wells week initial bending cracks and multiple fractures, blocking the formation fracturing sand. The results confirmed: the formation of the main factors is well maide fracturing sand plug multiple fractures week bend limiting fracturing fluid flow in fractures; overlapping multi-slit width of cracks caused by competition proppant bridging; natural fractures or multiple fractures to reduce fluid loss efficiency of the fracturing fluid, affecting the development of the main crack. Prevent fracturing sand plug on drilling vertical wells drilled as possible to improve the perforation phase, the application of the same diameter of the pump stops proppant slug technology to promote the main crack extension, to ensure adequate fracture width, prevent fracturing sand plug.