Detection and estimation of gas desorption from Devonian shale production and well-test pressure data /
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| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1991.
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| Subjects: | |
| Online Access: | ProQuest, Abstract Link to OAKTrust copy |
| Abstract: | The Devonian shales of the eastern United States are a major potential source of future domestic natural gas. These shales are considered to be an unconventional source of gas, however, due to (among other things) the existence of significant quantities of adsorbed gas. While it is estimated that adsorbed gas may account for 60 to 85% of the total gas content of the Devonian shales, few measured data are available for directly characterizing the gas desorption process in these formations. As a result, gas desorption is usually ignored (or modeled inadequately) in reservoir modeling studies performed on the Devonian shales. Thus, only limited confidence can be placed in simulator forecasts of Devonian shale well performance and in estimates of recoverable Devonian shale gas reserves. While few desorption data exist for the Devonian shales, cumulative gas production data are available for nearly all shale wells. In addition, well-test pressure data are often available or can be readily obtained. In this study, the techniques of parameter estimation and model identification (in conjunction with numerical reservoir simulation) are evaluated as a means for detecting the presence of adsorbed gas from hypothetical Devonian shale well-test and production data as well as for quantitatively estimating the parameters that model the gas desorption process. The accuracy of the desorption parameter estimates are also determined through statistical error analyses. Both linearized covariance and Monte Carlo error analyses are used to quantify parameter uncertainties. This work represents the first known attempt to quantify gas desorption in the Devonian shales from readily available (or obtainable) measured data. |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Chemical Engineering." |
| Physical Description: | xvi, 294 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |