Validation/enhancement of the "Jones-Owens" technique for the prediction of permeability in low permeability gas sands

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Title: Validation/enhancement of the "Jones-Owens" technique for the prediction of permeability in low permeability gas sands
Author: Florence, Francois-Andre
Abstract: This work presents the validation and enhancement of existing correlations for estimating and predicting the permeability in low permeability gas sands . The "original" problem of predicting the corrected or "liquid equivalent" permeability has been under investigation since the early 1940s ? ? ? ? ? ? in particular , using the application of "gas slippage" theory to petrophysics by Klinkenberg . In the first part of this work , the viability of the Jones -Owens and Sampath -Keighin correlations for estimating the Klinkenberg -corrected (absolute ) permeability from single -point , steady -state measurements were investigated . We also provide an update to these correlations using modern petrophysical data . In the second part of this work we proposed and validated a new "microflow" model for the evaluation of an equivalent liquid permeability from gas flow measurements . This work was based on a more detailed application of similar concepts employed by Klinkenberg . In fact , we obtained the Klinkenberg result as an approximate form of this result . A theoretical "microflow" result was given as a rational polynomial (i .e . , a polynomial divided by a polynomial ) in terms of the Knudsen number (ratio of the mean free path of the gas molecules to the characteristic flow length (typically the radius of the capillary ) ) , and this result can be applied as an explicit correlation device , or as an implicit prediction model (presuming the model is tuned to a particular data set ) . The following contributions are derived from this work : ? ? ? ? ? ? Validation and extension of the correlations proposed by Jones -Owens and Sampath -Keighin for low permeability samples . ? ? ? ? ? ? Development and validation of a new "microflow" model which correctly represents the flow of gases in low permeability core samples . This model is also applied as a correlation for prediction of the equivalent liquid permeability in much the same fashion as the Klinkenberg model , although the new model is substantially more theoretical (and robust ) as compared to the Klinkenberg correction model .
URI: http : / /hdl .handle .net /1969 .1 /5846
Date: 2007-09-17

Citation

Validation/enhancement of the "Jones-Owens" technique for the prediction of permeability in low permeability gas sands. Available electronically from http : / /hdl .handle .net /1969 .1 /5846 .

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