Tight Gas Reservoir Fracturing Stimulation and Reservoir Protection Technology After Fracturing

Tight sandstone gas is a very important non-conventional resource, it has low porosity(4%~12%),low permeability(﹤0.1×10-3um2),low gas saturation, high water saturation, small pore throat radius, and other features. As the tight sandstone gas reservoirs have complex reservoir structure, and a variety of pore, throat, micro-fracture development, and the fracturing technology to achieve low permeability tight gas production is very significant. The fracturing stimulation techniques of tight sandstone gas include hierarchical fracturing technology, large-scale fracturing, horizontal well section fracturing, CO2 foam fracturing technology, and so on. These technologies have achieved certain results in increasing tight sandstone gas production at home or abroad. In this paper, major types of fracturing techniques were described. After the fracturing stimulation and transformation, the invasion of foreign particles and filtrate will cause some damages to the reservoir. So after the fracturing, the reservoir protection is also essential, and main technique to reduce the scale of damage is temporary blocking technology for protecting the reservoir.