[Q4] (20 marks) Consider ID porous medium (discretize to three uniform grid blocks each of AX-200 ft, AY=100 ft, AZ-40 ft), the boundary condition is no flow boundary. The viscosity is 2 cp, Ct-3*10 psi-1, PHI-12%, At 10 days, the well is in second grid-block, Pi-2400 psi K= 60 md. the well produce at rate of 450 STB/day, determine pressure distribution for two time steps, If the dimensions of grids are doubled, what is the pressure distribution?