| At present,tight oil reservoir is the research focus for oil field development.This kind of reservoir is relatively complex,the geological features,percolation mechanism and development characteristic and other aspects are very different with those of conventional reservoir.And also,hydraulic fracturing must be used in order to get productivity,which is relatively low at early stage,declining fast in the middle period and steady at the later stage.All of the flow characters and fracturing methods are not reflected in the conventional reservoir numerical simulation software.The thesis firstly analyze the existing research state of flow characters of tight oil reservoir,considering main influence factors(such as stress sensitivity,starting pressure gradient and synergistic effect with each other)of tight oil reservoir numerical simulation,based on Shengli Three-dimension Three-phase Numerical Simulation Software,the nonlinear flow numerical simulation method is established and software improvement is carried out.Secondly,based on porous flow in reservoir and fracture,and flow characteristics in wellbore,mass conservation equations in reservoir,fracture and wellbore for oil-water two phase flow are established respectively.Thus,a three-dimensional "matrix-fracture-wellbore" coupled model is built.Then,coupling relationship among horizontal wellbore,fracture and reservoir is proposed,grid division method is given,and Jacobian matrix is constructed and solved by full implicit method.Lastly,integrated wellbore-fracture-reservoir coupling simulation for fractured horizontal well has been realized.Calculation examples for a fractured horizontal well F154-1 in a tight sand oil reservoir indicate that this integrated wellbore-fracture-reservoir coupling model fully reflects mutual influences among wellbore,fracture and reservoir,and can be applied to dynamic simulation for fractured horizontal well in tight oil reservoir effectively. |
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