Optimization Design Of Coalbed Methane Vertical Well And Horizontal Well Mixing Well Pattern

In the field of unconventional resources such as coalbed methane,the problem of low single well productivity and long payback period is generally faced.In order to adapt to the development direction of coalbed methane,this reseach is conducted.This paper mainly studies the mixed well pattern of vertical and horizontal wells in the field of coalbed methane based on the application of horizontal wells in the field of coalbed methane and the demand for coalbed methane development.Based on the geological data and production data of the study area,the production data analysis and history fitting of the production wells in the study area were carried out by means of 3D geological modeling and numerical simulation.The CMG numerical simulation software was used to establish a 3D geological model for the block.The influencing factors such as well pattern,well control area,well spacing and horizontal well length are analyzed.Then,the fracturing factors such as the length,the number of fractures,conductivity and fracture spacing are analyzed.The orthogonalization experiments were carried out on each parameter to analyze the influence of different parameters on the productivity of other factors.Based on the history fitting and residual gas research in the comprehensive study area,the adjusted development plan was proposed,and the development effects of the horizontal well network,the vertical well network and the mixed well network were compared.