The research on influencing factors of new crack rediction for special low permeability reservior

The natural productivity of special low permeability reservoirs is low, which can not meet the industrial oil output standard, and the fracturing treatment must be carried out to take effective industrial development. There are many factors influencing the new crack redirection which carried out repeat fracturing. In order to research the change of stress field after repeat fracturing, the mathematical model of finite element method of two-dimensional stress field with considering the existence of fracture is established, and on that basis, combining with the actual oil field, the impact of stratigraphic principal stress difference, crack width, crack length and elastic parameter on the new crack is researched, which provide theoretical direction for reasonable arrangement of well pattern.