A quadratic cumulative production model for the material balance of an abnormally pressured gas reservoir /
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[College Station, Tex.] :
[Texas A&M University],
[2005]
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| Online Access: | Link to OAK Trust copy |
| Abstract: | The premise of this research is the concept, development, and application of an approximate relation for the material balance of abnormally-pressured gas reservoirs. The approximation is formulated directly from the rigorous material balance for the case of an abnormally-pressured gas reservoir. This result is given by: [ unable to reproduce]. We note that the primary assumption in this derivation is that [w]G[subscript p] ( or c̄[subscript e](p)(p[subscript i]-p))<1. Further, we can proceed by assuming that [w] is either constant or some arbitrary function. If we assume [w]=constant, then the following form results: [ unable to reproduce]. At first glance there may be concern that this approximation is not sufficiently valid for field applications - however, we have shown this relation to be an extraordinarily accurate approximation of the rigorous material balance. This result is suited not only for use as a characteristic model, but also for use as a data analysis mechanism (i.e., this result is used to develop a suite of analysis plots, plotting functions, a type curve, etc.). In this work we provide the following new results: 1) A suite of 6 (six) plotting functions based on the p/z-G[subscript p]² material balance model. 2) A suite of 4 (four) p/z-[w]G[subscript p] performance plots which are used to calibrate analysis. 3) A new type curve in terms of a dimensionless pressure function (p[subscript D]=([ subscript p]/z[subscript i]-p/z)/p[subscript i]/z[subscript i]) versus a dimensionless cumulative production function (G[subscript pD]=G[subscript p]/G), where the type curve solution is based on the new p/z-G[subscript p]² (a quadratic material balance) model. We also use the "Gan" analysis approach (3 (three) specialized plots), where this analysis is based on the observation of 2-straight line trends on a p/z-G [subscript p] plot for an abnormally pressured reservoir. The Gan analysis is used primarily for orientation, particularly with regard to the 4 new [w]-G [subscript p] performance plots. In order to establish a comprehensive validation of the new method for applications to performance data from abnormally pressured reservoirs, we provide a complete analysis suite for the following cases. 4 "four" numerical simulation cases (3 "dry gas" cases, 1 "gas condensate" case). 20 (twenty) field cases taken from the pteroleum literature, or acquired from industry sources. It is relevant to note that all validation cases have been successfully evaluated using the new methodology and we propose that this new technique will become a standard practice for the analysis of reservoir performance data obtained from abnormally pressured gas reservoirs. |
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| Item Description: | "Major Subject: Petroleum Engineering" Title from author supplied metadata (automated record created on Feb. 17, 2005.) Vita. Abstract. Electronic resource. |
| Format: | Mode of access: World Wide Web. System requirements: World Wide Web access and Adobe Acrobat Reader. |
| Bibliography: | Includes bibliographical references. |