Introduction 1 1. Conventional & Isochronal Tests 5 1. 1 Derivation of Fundamental Flow Equation 6 1. 2 Conventional Test 10 1. 3 Isochronal Test 13 1. 4 Modified Isochronal Test 17 2. Additional Testing Options 23 2. 1 Pseudopressure (Real Gas Potential) Treatment for Gas Flow 24 2. 2 The Radial Diffusivity Equation for Gas Flow 31 2. 3 Analytical Solution of the Diffusivity Equation 33 2. 4 Flow Regimes 34 2. 5 Skin Factor 36 2. 6 Turbulent Flow Factor 40 2. 7 Drawdown or Falloff Test 41 2. 8 Buildup Test 43 2. 9 Determination of S, S' and 0 from Buildup and Drawdown Tests 47 53 3....