The Theoretical Study On Well Test Analysis Of Fractured Horizontal Well With Fracture Network

Fractured horizontal well is one of the effective means of reducing cost and increasing production,which can be widely utilized in conventional and inconventional reservoirs.In order to know the characteristic of bottom-hole pressure of different type of fractured horizontal wells,this paper set up and solved well testing models respectively which considering fearture network or not.Furthermore,the characteristics and influential factors of the well test curves were deeply analyzed through programing.This research will build foundations for practical well test interpretations.The main research content includes:(1)A homogeneous oil reservoir model considering well-bore storage and skin effect has been built and the solution in Laplace domain has been get through source-function method.A calculation method has been provided to solve the model and the distribution of dimensionless pressure has been obtained.By using the Stehfest numerical inversion and programing,the dimensionless bottom-hole pressure and its derivative of a fractured horizontal well with sealing boundary have been obtained.Moreover,the characteristics of the dual-logarithm curves and its influential factors such as fracture's half length have been analyzed considerably.(2)A dual-porosity oil reservoir model with consideration of well-bore storage and skin effect has been built and the solution in Laplace domain has been get through source-function method.By using the same calculation method,Stehfest numerical inversion and programing,the dimensionless bottom-hole pressure and its derivative of a fractured horizontal well with sealing boundary have been obtained including the distribution of dimensionless pressure.Moreover,the characteristics of well test curves and its influential factors such as interporosity flow coefficient have been discussed.(3)Taking well-bore storage and skin effect into consideration,a linear-composite oil reservoir model has been built.A calculation method has been provided to solve the model after knowing the corresponding source function.By using the Stehfest numerical inversion and programing,the dimensionless bottom-hole pressure and its derivative of a fractured horizontal well with sealing boundary have been obtained.Besides,the characteristics of the well test curves and its influential factors such as mobility ratio have been studied.(4)A composite oil reservoir model considering well-bore storage,skin effect and fracture network has been built.The boundary element method was applied to solve the model.By using the Stehfest numerical inversion and programing,the dimensionless bottom-hole pressure and its derivative of a fractured horizontal well with sealing rectangular boundary have been obtained.The characteristics of well test curves and its influential factors such as the permeability of fracture network have been discussed.Through the study of well test analysis theory of the above models,we can know characteristics of bottom-hole pressure dynamic response better in fractured horizontal well with different kinds of reservoir,which can provide theoretical guidance for well test interpretation in practical work.