Numerical Simulation Study On The Seepage Of Shale Gas From The Niutitang Formation In Northern Guizhou

As a clean energy,Shale gas has the very big development potential in China,the development of shale gas has become the focus of gas exploration industry in China.At present,the study of shale gas development is still in its infancy,Difficult to implement in the actual means can be done by numerical simulation method,so the simulation of shale gas can facilitate our deeper understanding of the shale gas development.Based on shale reservoir characteristics and the migration mechanism of shale gas,considering the diffusion of shale gas in shale matrix and shale gas reservoir pressure in the process of change on the influence of porosity and permeability reservoir,shale gas is established a mathematical model of fluid-solid coupling seepage.At the same time,based on the formation characteristics suck cattle hoof pond group,more than in the physical field coupling numerical simulation software COMSOL Multiphysics software to establish suck neat's foot pond group of physical model and physical model of shale gas,by solving fluid-structure coupling mathematical model for shale reservoir in every moment of the exploitation and analyzes the fracturing fracture spacing,length,and an Angle and horizontal Wells in the process of shale gas reservoir pressure,the influence of the shale gas reservoir pressure with time gradually reduce;Fracturing fracture has the certain influence two fracturing cracks affect interval overlap,the mutual interference between cracks,the fracturing fracture spacing,the greater the reservoir pressure decline,the less.When fracturing cracks affect interval no overlap,there is no mutual interference between cracks,the reservoir pressure is no longer with the increase of fracturing fracture spacing and change;The longer the fracturing fracture length,reservoir pressure drop,the more and the closer the fracturing cracks,the greater the decline;Fracturing cracks and the greater the Angle of horizontal Wells,reservoir decreased less.At the same time,this paper also studied the different positions of the natural fracture of reservoir pressure and the influence of the total output of shale gas,natural fracture fracturing cracks disjoint,natural fracture will not much affect the reservoir pressure,but it can increase the total volume of shale gas and the slightly The more natural and fracturing cracks intersecting point,reservoir pressure drop range is larger,the higher the total volume of shale gas,and at the same time,the number of intersection point phase natural forms a closed interval and fracturing cracks will increase the gas production of shale gas;Natural fracture and fracture crack formation of the closed interval,the greater the pressure drop of reservoir interval,the greater the shale gas,the greater the total volume.