Pressure Transient Test

# Pressure Transient Test - 1. INTRODUCTION _ 3 2. THE FLOW...

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1. INTRODUCTION ____________________________________________________ 3 2. THE FLOW EQUATIONS _____________________________________________ 4 Mass Conservation. ___________________________________________________________ 4 Darcy’s Law _________________________________________________________________ 6 Overall Flow Equation _________________________________________________________________ 7 3. GLOBAL FLOW REGIMES____________________________________________ 8 4. RADIAL FLOW_____________________________________________________ 13 4.1 Steady-State Flow_________________________________________________________ 14 4.2 Pseudosteady State Flow___________________________________________________ 16 4.3 Transient Flow ___________________________________________________________ 18 4.4 Dimensionless Variables ___________________________________________________ 19 4.5 Interference Testing and Type-Curve Matching________________________________ 20 Example 4.5.1 - Interference Testing _____________________________________________________ 21 Problem 4.5.1 - Interference Test in an aquifer______________________________________________ 25 4.6 Semilog Analysis__________________________________________________________ 27 Skin _______________________________________________________________________________ 28 4.7 Wellbore Storage _________________________________________________________ 29 4.8 Classroom Exercises_______________________________________________________ 33 4.8.1 Brazilian Well___________________________________________________________________ 33 4.8.2 Drawdown Example from Ref. 10 __________________________________________________ 35 4.9 Variable Rate Well Tests and Buildup ________________________________________ 36 Horner and MBH Analysis _____________________________________________________________ 37 MDH Analysis_______________________________________________________________________ 44 Agarwal Equivalent Time ______________________________________________________________ 44 4.10 Classroom Exercise ______________________________________________________ 46 5. VERTICALLY FRACTURED WELLS __________________________________ 48 5.1 Infinite-Conductivity Fracture; Buildup Example, Ref. 11__________________________________ 52 5.2 Finite-Conductivity Fracture: Drawdown Example _____________________________ 53 6. COMPUTATION OF PRESSURE DERIVATIVES ________________________ 55 7. GAS WELL TESTING________________________________________________ 57 7.1 Introduction _____________________________________________________________ 57 7.2 Real Gas Pseudopressure___________________________________________________ 57 7.3 Construction of m(p) data __________________________________________________ 60 7.4 Simplifications to the m(p) approach ________________________________________ 61 7.5 Real Gas Pseudotime 14 _____________________________________________________ 62 7.6.1 Example Data – Fractured Well ____________________________________________________ 64 7.6.2 – Test data from Offshore Gulf of Mexico_____________________________________________ 66

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## This note was uploaded on 04/05/2011 for the course PETE 689 taught by Professor Staff during the Spring '08 term at Texas A&M.

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Pressure Transient Test - 1. INTRODUCTION _ 3 2. THE FLOW...

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