Petroleum Reservoir Engineering Practice

Chapter 8. Gas Reservoirs

8.1 Introduction

This chapter presents methods for calculations of in-place volumes and reserves for gas reservoirs. Gas reservoirs are classified as dry, wet or condensate depending on path of depletion (in terms of pressure and temperature) relative to the phase envelope of the reservoir fluids. In Chapter 4, the characteristics of dry, wet, and retrograde condensate gas reservoirs were presented. For dry gas reservoirs, no liquids are formed either in the reservoir or production facilities because the path of depletion is completely outside the phase envelope (Figure 4.7). For wet gas reservoirs, no liquids are condensed within the reservoir, but liquids may condense in the production facilities because temperature ...