Productivity Prediction And Parameter Optimization Of Horizontal Well Of Shale Gas Fracturing

Shale gas production in China is huge, but the recoverable reserves of shale gas reservoir is still at the lower stage; Compared with the conventional gas reservoir, shale;as reservoir percolation space is complex, shale is not just the density, low porosity, low permeability, and high degree of heterogeneity; For shale gas fracturing horizontal well productivity prediction, it is necessary to put forward the correct assumptions, both want to consider one of the main factors, and to ignore the secondary factors influence on capacity. To increase the accuracy of the productivity prediction.Shale gas seepage space determines the basic features of shale gas reservoir horizontal Wells often after a large volume of fracturing can achieve the requirement of industrial production. Shale gas fracturing horizontal well productivity prediction is one of the most important aspects of the preliminary design, and also is an important link of fracturing reconstruction scheme optimization. Based on the reference on the basis of the existing researches on shale gas seepage theory, is developed, with the consideration of Langmuir isotherm adsorption, Knudsen diffusion and belt slippage effect of viscous flow model of gas flow; Predecessors’as a reference for fracturing zone, this paper under the constant pressure boundary, on the basis of conventional gas fracturing of horizontal seepage model, through the mirror reaction principle, stitched under the interference of horizontal well fracturing is developed, with the consideration of gas seepage model. Using MATLab numerical software, find out the shale gas fracturing pressure of horizontal well production performance and capacity of diminishing. Finally through the analysis of the capacity factors, it is concluded that the Langmuir volume Vl, Langmuir equilibrium constant b, and formation permeability and porosity formation parameters, such as the relationship between the influence of shale gas production capacity, for subsequent shale gas mining provide design basis for horizontal well fracturing.Through the study of production capacity, shale gas horizontal Wells after fracturing in different fracture diverting capacity, different crack length, crack spacing and crack a number of cases, the N201estimated Daily productionand cumulative gas production, comprehensively analyzes the shale formation sensitivity of fracture parameters, and it is concluded that the cracks of the optimal parameter combination...