Page 23 - Fundamentals of Reservoir Engineering

CONTENTS XXIII

Fig. 8.18 Schematic of a general analysis program applicable to pressure buildup tests for
any fluid system 294

Fig. 9.1 Radial aquifer geometry 300

Fig. 9.2 Linear aquifer geometry 300

Fig. 9.3 Dimensioniess water influx, constant terminal pressure case, radial flow. (After
Hurst and van Everdingen, ref. 1) 302

Fig. 9.4 Dimensionless water influx, constant terminal pressure case, radial flow (After
Hurst and van Everdingen, ref. 1) 303

Fig. 9.5 Dimensionless water influx, constant terminal pressure case, radial flow (After
Hurst and van Everdingen, ref. 1) 304

Fig. 9.6 Dimensionless water influx, constant terminal pressure case, radial and linear
flow (After Hurst and van Everdingen, ref.1) 305

Fig. 9.7 Dimensionless water influx, constant terminal pressure case, radial and linear
flow (After Hurst and van Everdingen, ref.1) 306
Fig. 9.8 Water influx from a segment of a radial aquifer 307

Fig. 9.9 Matching a continuous pressure decline at the reservoir-aquifer boundary by a
series of discrete pressure steps 309

Fig. 9.10 Aquifer-reservoir geometry, exercise 9.2 311

Fig. 9.11 Reservoir production and pressure history; exercise 9.2 311

Fig. 9.12 R s and B g as functions of pressure; exercise 9.2 312

Fig. 9.13 B o as a function of pressure; exercise 9.2 312

Fig. 9.14 Reservoir pressure decline approximated by a series of discrete pressure steps;
exercise 9.2 313

Fig. 9.15 Aquifer fitting using the interpretation technique of Havlena and Odeh 319

Fig. 9.16 Comparison between Hurst and van Everdingen and Fetkovitch for r eD = 5 327

Fig. 9.17 Comparison between Hurst and van Everdingen and Fetkovitch for r eD = 10 327

Fig. 9.18 Predicting the pressure decline in a water drive gas reservoir 329

Fig. 9.19 Prediction of gas reservoir pressures resulting from fluid withdrawal and water
influx (Hurst and van Everdingen) 330

Fig. 9.20 Prediction of gas reservoir pressures resulting from fluid withdrawal and water
influx (Fetkovitch) 332

Fig. 9.21 Conditions prior to production in a steam soak cycle 333