Study On The Effect Of Fracture Parameters On The Productivity Of Low Permeability Sandstone Gas Reservoir

The low permeability sandstone gas reservoirs need to increase the gas production due to the poor reservoir property,low permeability,low yield and low abundance.The horizontal well fracturing can make a lot of artificial fractures in the open hole section,improve the seepage channel of the reservoir,and now it has become an effective means to improve the recovery of low permeability gas reservoir.In this paper,the fracture model and the black oil model are used to simulate the fracture of low permeability sandstone gas reservoir by using the software of fracturing and numerical simulation software.The historical parameters of the X-block typical wells were used to invert the formation parameters,which provide the reference for the development of new wells.The new wells as an example to study the influence of the number of fractures,the length of fractures and the variation of fractures spacing on the production capacity.The standards of geometrical parameters of fractured fractures in low permeability gas reservoirs have formed.Finally,based on the fracture parameter optimization of the special position of the fracturing crack distribution(crack position,wings symmetry,fracture arrangement)effect on productivity,puts forward a digital simulation method to determine the artificial fracture initiation range.Research shows: When the length of horizontal is fixed,there exists an optimum value for the number,length and spacing of fractures.For the horizontal well along the direction of the minimum horizontal principal stress,the crack initiation direction is closer to the upper and lower end of the horizontal well section,the smaller the production capacity is;The closer to the left and right ends of the horizontal axis of the cross section,the greater the productivity is.In the total seam length equal but the two wings are not equal to the conditions of the gap,the greater the gap between the two wings,the lower the production capacity.The production rate of gas well is the biggest,and the flow resistance of the reservoir is the smallest and the single fracture is relatively high.