Experimental and Numerical Assessment of the Influence of Bottomhole Pressure Drawdown on Terrigenous Reservoir Permeability and Well Productivity

During oil and gas fields development, a decrease in reservoir bottomhole pressure has often detrimental effect on properties, especially permeability. This study presents the results of laboratory tests conducted to determine response terrigenous core-sample permeability changes effective stresses pressure. The considered samples were exposed for long time constant high stress more reliable assessment viscoplastic deformations. According these experiments, core may reach 21% with by 9.5 MPa from initial conditions. Numerical simulations have been also conducted. These based finite element modeling near-wellbore zone using poroelasticity relations. simulation show limited (by 17%, which can lead well productivity 13%).