Paper details:Petroleum engineering department, reservoir engineering course. please refer the book Dake.
Problem 1. Use the Welge method to estimate volumes of oil recovery and water injected at breakthrough for the fractional flow curve in the Homework Supplement folder on Canvas. What is the water cut at water breakthrough?

Problem 2. Construct a tangent at Sw of 58%. Estimate volumes of oil recovery and water injected for this tangent. What is the water cut?

Problem 3. Repeat Problem 3 for Sw of 62%.