Study On The Finite Element Method For Productivity Of Horizontal Well With Multi-Stage Fracturing Of Shale

As a new type of energy,the study of shale gas extraction technology is of great strategic significance for China's energy restructuring.Shale gas reservoirs are characterized by poor permeability,minimal porosity,deep burial depth,and poor physical properties.Therefore,shale gas reservoirs must undergo hydraulic fracturing to improve production efficiency and obtain profits.Fracturing of horizontal Wells is the mainstream trend in the world at present.However,shale gas reservoirs have the effects of desorption and diffusion in the reservoir,as well as complex seepage characteristics,so the productivity analysis is quite complicated.In order to further promote the development of shale gas,the production dynamics and influencing factors of artificial fracturing horizontal Wells need to be studied in depth.This paper investigates the basic characteristics of shale gas,introduces the characteristics and properties of shale gas reservoirs,the storage and migration mechanism of shale gas,and has a deeper understanding of the geological characteristics of shale gas and the percolation mode of shale gas reservoirs.The finite element method is compared with other numerical methods to further understand its advantages,disadvantages and limitations.The basic principle of the finite element method is familiar with,which can make better use of the finite element method and improve the efficiency and accuracy of experimental research.In this paper,the finite element method and COMSOL finite element simulation software are used to establish the shale gas reservoir seepage model,simulate the factors affecting the productivity of horizontal Wells,and predict the pressure change and productivity near the fracturing zone of horizontal Wells.By adjusting fracturing parameters,such as the number of fractures,the Angle between fractures and horizontal Wells,and the half-length and spacing of fractures,the influence of fracturing parameters on productivity and near-wellbore pressure can be further understood.The influence degree of each factor on productivity is analyzed by grey relational degree analysis.It plays a guiding role in the development of shale gas and the improvement of oil recovery and maximizes the benefit.