Pressure Transient Analysis Considering Geo-mechanic Effects in Deep Oil Reservoirs

Considering the characteristics of high pressure and high stratum stress in deep reservoirs and in order to study the interaction between seepage field and stress field in the development of deep reservoirs, pressure transient analysis models of three different well types are established considering geo-mechanic effects for deep oil reservoirs, including vertical wells, horizontal wells, and fractured horizontal wells. The models are solved by finite element method and pressure responses are analyzed and compared with or without geo-mechanic effects. The result shows that both the pressure and pressure derivative curves are upward when considering stress field, where porosity and permeability decrease due to the deformation in deep reservoir, and the degree of permeability reduction is greater than that of porosity. And well testing curves are upward more obviously if the value of rocks resisting deformation is smaller. Finally, the parameters of fracture width, fracture length, and distance between fractures in multi-staged fractured horizontal wells are discussed.