Decline curve analysis using type curves - hydraulically fractured wells /
Problem: This work provides the development, validation, and application of new decline type curves for a well with a finite conductivity vertical fracture centered in a bounded, circular reservoir. In particular, this thesis fills a void in the modern inventory of decline type curves. This wor...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
2002.
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| Summary: | Problem: This work provides the development, validation, and application of new decline type curves for a well with a finite conductivity vertical fracture centered in a bounded, circular reservoir. In particular, this thesis fills a void in the modern inventory of decline type curves. This work should be directly applicable to many cases of production data analysis - the mostly likely candidates for analysis/interpretation using these type curves are cases of production behavior from low permeability gas reservoirs. In this study we develop, validate, and present a new "desuperposition" solution for the case of a well produced at a constant rate with a finite conductivity vertical fracture in a finite-acting (circular) reservoir. This desuperposition solution is given (in the Laplace domain) as: [ ] where u = sf(s), and f(s) is a transfer function for the case of a dual porosity reservoir. Schematically, this solution can be expressed as: [ ] This solution is both accurate and straightforward (although the computation of the "transient" part of the solution is generally tedious) - and this solution should be considered appropriate for the analysis of well performance behavior (flowrates and pressures) from wells which have had hydraulic fracture stimulation treatments. We have provided an extensive validation of this solution using available data taken from the petroleum literature and we are satisfied that this solution is sufficiently valid for analysis and inter-pretation of well performance data. Using this solution we prepared the following "decline" type curves for FcD values from 0.1 to 1000 (i.e., individual type curves for each FcD value) using a range of reD values from 1 to 1000. - "Fetkovich" format, rate-time decline type curves (constant pressure case). - "Fetkovich-McCray" format, rate-time decline type curves (equivalent constant rate case). - "Fetkovich-McCray" format, rate-cumulative production decline type curves. In addition to the development and presentation of these new type curves, we provide example demon-strations of the decline type curve analysis methodology using field cases of continuously measured production rate and surface pressure data for a low permeability/high pressure gas reservoir (Texas), USA. We believe that these solutions/type curves provide an analysis/interpretation mechanism that has been absent from the petroleum literature. Using field data, our comparison of the new "finite-conductivity" solutions with the traditional "infinite conductivity" solutions clearly shows the value and appropriateness of our new type curves. This validation suggests that the proposed type curves will have broad utility in the petroleum literature - particularly for applications in low permeability gas reservoirs. |
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| Item Description: | Vita. "Major subject: Petroleum Engineering". |
| Physical Description: | xiii, 116 leaves : illustrations ; 28 cm. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references (leaves 71-73). |