September 2012
Intermediate to advanced
752 pages
19h 47m
English
book
Petroleum Production Systems
by Michael J. Economides, Ding Zhu, A. Daniel Hill, Christine Ehlig-Economides
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Chapter 6. The Near-Wellbore Condition and Damage Characterization; Skin Effects
6.1. Introduction
Radial flow to a vertical well results in increasingly higher flow velocity near the well and accounts for the semilogarithmic nature of the pressure–distance relationship presented in Chapter 2 [Equation (2-4)]. Van Everdingen and Hurst (1949) introduced the concept of a pressure difference, Δps, occurring over an infinitesimal distance at the wellbore radius proportional to the skin factor, s, as in Equation (2-5), to account for a nonideal flow profile.
Mathematically, the Van Everdingen and Hurst skin effect has no physical dimension and is analogous to the film coefficient in heat transfer. When added to ln(re/rw) for steady state, ln(0.472 ...
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