The Reservoir Engineering Aspects of Waterflooding, Second Edition by H.R. (Hal) Warner Jr.;

Author:H.R. (Hal) Warner Jr.; [H.R. “Hal” Warner, Jr.]
Language: eng
Format: epub
Tags: The Reservoir Engineering Aspects of Waterflooding, Second Edition
Publisher: SPE
Published: 2015-09-17T05:00:00+00:00

where Qw is the rate of water injection in barrels per day (or equivalent units), pwf is the injecting bottomhole pressure, and pws is the static bottomhole pressure. pwf can be estimated from the wellhead pressure, the depth of the well, the density of water, and the flowing pressure gradient. pws is usually determined from PFO tests.

Fig. 11.11—Simplified fluid distribution schematic for Hearn method.

Fig. 11.12—Hearn plot illustrating interpretations of various slope changes.

Fig. 11.12 illustrates the various conditions observable on a Hearn plot. Because the horizontal axis is a logarithmic scale, the plot is investigating different radii of water-oil displacement as the cumulative volume of water injected increases. Most slope changes are related to near-wellbore effects (sandface plugging or fracturing), although some changes are related to overall water-oil displacement phenomena on interwell distances.

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