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• W4241749142 abstract "Iterative Method To Determine Gas Reserves Using Material Balance and Pressure Transient Analysis Baljit S. Sehbi; Baljit S. Sehbi Texas Tech University Search for other works by this author on: This Site Google Scholar Scott M. Frailey; Scott M. Frailey Texas Tech University Search for other works by this author on: This Site Google Scholar Akanni S. Lawal Akanni S. Lawal Texas Tech University Search for other works by this author on: This Site Google Scholar Paper presented at the SPE Permian Basin Oil and Gas Recovery Conference, Midland, Texas, March 2000. Paper Number: SPE-59697-MS https://doi.org/10.2118/59697-MS Published: March 21 2000 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Sehbi, Baljit S., Frailey, Scott M., and Akanni S. Lawal. Iterative Method To Determine Gas Reserves Using Material Balance and Pressure Transient Analysis. Paper presented at the SPE Permian Basin Oil and Gas Recovery Conference, Midland, Texas, March 2000. doi: https://doi.org/10.2118/59697-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE Permian Basin Oil and Gas Recovery Conference Search Advanced Search AbstractThe p/z vs. Gp material balance approach is an established, simple, quick and convenient means of surveying a reservoir's performance and determining gas reserves and gas-in-place (G). The x-intercept is G. Unfortunately, this approach may be an independent analysis, and not confirmed with a separate method.Theory requires that the p in the p/z term to be the average reservoir pressure at which a cumulative production of Gp occurs. A source of average reservoir pressure is a pressure buildup test in which the MBH method is used to find average reservoir pressure. The MBH method requires an estimate of drainage area (A), which is directly related to G (?Ah); this is termed GMBH. The average reservoir pressure that was calculated using the estimated A are plotted as p/z in the material balance plot. An extrapolation of the trend to the x-axis is Gp/z. The GMBH and Gp/z are used iteratively until the two estimates of G converge.This proposed method is tested on synthetically derived pressure data simulated with a commercially available, analytical well testing program for two different reservoir shapes and three different well locations. One single-well gas reservoir is analyzed for the case study.IntroductionThe material balance for a gas reservoir using the familiar p/z vs. Gp (cumulative gas produced) has long been used to determine the initial gas-in-place (G) and estimated ultimate recovery (EUR). Cumulative production is accurately metered and known; the z-factor is readily available via correlations or PVT experiments. However, the pressure, which is the average reservoir pressure, may not be available and may be less reliable. If using pressure buildup tests to find average reservoir pressure, a weakness of available methods (e.g., MBH) is the prerequisite knowledge of the well's drainage size, shape, and location of the well within the drainage area [Matthews, et al (1953)].Rodgers et al. (1983) developed a method with the p/z plot and pressure measured for a flowing well exhibiting pseudo-steady state (PSS) behavior. This method combined PSS pressure data and the material balance to improve the estimate of G.A combination of the material balance equation (p/z plot) and the average pressure techniques (MBH) used in this paper refines the estimate of G and EUR by adjusting the average pressure found by the available techniques. An iterative method for finding G is proposed. Keywords: material balance, iterative method, pressure data, well location, reservoir pressure, iteration, rectangular drainage area, gas reservoir, mbh method, average pressure Subjects: Formation Evaluation & Management, Drillstem/well testing This content is only available via PDF. 2000. Society of Petroleum Engineers You can access this article if you purchase or spend a download." @default.
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• W4241749142 title "Iterative Method To Determine Gas Reserves Using Material Balance and Pressure Transient Analysis" @default.
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