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Petroleum Production Systems, Second Edition by A. Daniel Hill, Christine Ehlig-Economides, Ding Zhu, Michael J. Economides

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Chapter 2. Production from Undersaturated Oil Reservoirs

2.1. Introduction

Well deliverability analysis predicts the wellbore flowing pressure for a given surface flowrate. Chapters 25 deal with well inflow performance and describe the reservoir variables that control well productivity under different conditions. Wells drilled in oil reservoirs drain a porous medium of porosity ϕ, net thickness h, and permeability k. To understand the process of flow from the reservoir and into the well sandface, a simple expression of Darcy’s (1856) law in radial coordinates can be used first:

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where A is radial flow area at a distance r given by A = 2πrh.

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