Study On Steady - State Productivity Of Fractured Horizontal Well In Dense Gas Reservoir

Now days,the exploration of tight gas has draw extensive attention all around the world, and this resource is also regarded as one of the most potential unconventional energy. The tight gas has its own special accumulation model, characteristics and complex percolation mechanism, which means the development process is more difficult and the technical requirement is more strict than that in the common reservoir. Thus, the research on the mechanism, characteristic and the productivity prediction model comes to be more important than ever before.Based on large number literature researches about the exploration and development situation of the tight gas, this paper dwelled on researching the accumulation regularity, generation characteristics and productivity forecasting model of this reservoir. During this process, based on the specialized percolation mechanism of tight gas, considering the gas water two-phase flow phenomenon in the reservoir, this paper give a new definition of the gas water two-phase pseudopressure considering the stress sensitivity and the gas slippage effect. According to the rectangle fractured horizontal well flow model, considering the coupling relationship between cracks and well bore, deprived the productivity formula for the fractured horizontal perforation completion well. According to the capsule fractured horizontal well flow model, considering the interaction of the cracks, using the equivalent filtration resistance method, deprived the productivity formula for the fractured horizontal open-hole completion well in tight gas reservoir. With the cases, proved the rationality of formulas by the calculation program, detailed analyzed the productivity influence of different parameters, obtained the rational and effective conclusion for the exploration.The research of the tight gas reservoir productivity forecast can promote the productivity forecasting situation, it has provided theoretical basis not only for the tight gas exploration but also the development in the future.