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Title: Proper Partial Penetration Of A Gas Well To Allow Maximum Drawdown And Still Prevent The Coning Of Water
Author: Walter m. Rzepczynski
Source: American Gas Association 1990
Year Published: 1990
Abstract: The purpose of this study was to obtain the maximum gas flow from a well without coning water when the well is completed by partial penetration of a gas bubble with a defined thickness and an underlying gas-water contact. By theoretical computations, using Muskat and Arthurs equations and graphical charts, one can compute both the maximum safe pressure drawdown in the well and the height of the water cone below the gas well. Any thin, low, vertical permeability layers existing between the bottom of the gas well and the gas-water contact would additionally help to prevent water coning. When a partial penetration of 20 percent of a 95-foot gas bubble or 30 percent of a 50-foot gas bubble are used, the computations show that the water cone can rise about 60 percent of the distance from the gas-water interface to the top of the gas bubble.

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