Study Of Productivity Prediction Method For Horizontal Wells In Shale Gas Reservoir

At present, as the development of world economy, it makes the growing demand for oil and gas resources, and shale gas is one of the important unconventional clean energy, the shale gas resources exploration and development has become the focus of the world.Shale gas reservoirs are low porosity and low permeability tight gas reservoirs, the natural production capacity is low, the economy must be carried out in order to obtain fracturing capacity shale gas. Dark shale or carbon-rich shale gas, most gas adsorption or free-state occurrence. Crack is a major shale gas gathering place migration, by studying the adsorption and desorption characteristics of shale gas, shale gas geological characteristics, defined the special shale gas in underground percolation mechanism to analyze the impact shale gas adsorption, factors desorption. Bilinear flow based on the previous model, the establishment of a tri-linear flow model of vertical fracture wells. The model is fluidized by the formation fracture linear flow and linear flow composed of two vertical formations, combined with fracture morphology and geological characteristics of the reservoir were established in the matrix, fractures and the wellbore three linear equation of abortion, and through the border cracks and formation conditions of convergence coupled solution. Also considering the establishment of a pressure gradient, the impact of stress sensitivity and channeling effects of shale gas horizontal wells, namely the establishment of a production model under different factors, and the use of the Laplace transform to solve, draw pressure dynamic curve, divided flow phase, the evaluation of the capacity. On this basis, to carry out numerical simulation of shale gas reservoirs, the influence of variation of fracture parameters on the yield of shale gas reservoir fracturing, the results show that horizontal well fracturing of shale gas wells can significantly improve the yield.