Estimation and error analysis of permeability from array induction logs /
Heterogeneity in oil and gas reservoirs is prevalent and
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| Format: | Thesis Book |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1995.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=742745491&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | Heterogeneity in oil and gas reservoirs is prevalent and significantly affects reservoir performance. Permeability variation is the most important type of heterogeneity in terms of effects on flow rate and ultimate recovery. Unfortunately, characterizing permeability heterogeneity is difficult and expensive; often requiring special sampling and testing procedures which are too expensive to perform on most wells. This dissertation presents a new, relatively inexpensive method for estimating permeability of a layered reservoir from a multiarray induction log. The method is call PemiLog and is based on a model of the mud filtrate invasion into the reservoir during drilling and a model of the multiarray induction log. The model accounts for two phase reservoir flow and dynamic changes in mudcake thickness and permeability. Results from field examples and Monte Carlo error analyses indicate that permeability estimates from low to moderate permeability gas reservoirs are accurate within a factor of three of the true, undisturbed, in-situ gas permeability in gas zones and the absolute pen-neability in water zones. The method presented here is an extension and improvement over previous timelapse logging based methods for permeability estimation. The primary benefits of this method is that neither time-lapse logging measurements nor laboratory measurements of relative permeability or capillary pressure are required. The method does require pressure measurements in each zone, a dynamic filtration test of the drilling mud, drilling records, and detailed log analysis. |
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| Item Description: | Vita. "Major Subject: Petroleum Engineering". |
| Physical Description: | x, 123 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references. |