3 Semester Credit Hours Prerequisites: Seniors only; 3.0 TTU GPA; C or better in PETR 4306, PETR 4324, PETR 4121, PETR 4300. Corequisite: PETR 4222, PETR 4319. Solution to the diffusivity equation in hydrocarbon reservoirs. Well testing methods. Analysis and interpretation of buildup, drawdown and interference tests. Application to naturally and hydraulically fractured reservoirs and to unconventional oil and gas reservoirs. Type curve and derivative approach.