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• W2020909721 abstract "Abstract A procedure for analyzing short-term transient pressure (well test) data for a vertically fractured pressure (well test) data for a vertically fractured gas well is presented. The analysis provides unique estimates of important reservoir, wellbore and fracture parameters by simulation and matching test data. The parameters developed can then be used to forecast the performance. The simulator is primarily designed around analytical techniques, utilizing published dimensionless pressure drop functions for a published dimensionless pressure drop functions for a vertically fractured well system, as well as for wellbore storage effects. By using this procedure practicing engineers will considerably lessen time and practicing engineers will considerably lessen time and resources involved in analyzing well tests, while obtaining more reliable interpretations. The procedure is designed to consider the entire range of the available drawdown and buildup data while minimizing user intervention. The model considers the effects of fracture conductivity, fracture length, fracture face damage, formation flow capacity or permeability, wellbore storage, fracture storage, and permeability, wellbore storage, fracture storage, and variable rates of flow during the test period, as well as the effect of producing time on the buildup behavior. Several examples of actual field test data and their analysis using this procedure are presented. It is cautioned that the method finds best application when a single pressure drawdown followed by a buildup is available for a simple, homogeneous and uniform reservoir geometry. Furthermore, the well should be cleaned of fracturing fluids and a stabilized static pressure must be obtained prior to conducting the flow pressure must be obtained prior to conducting the flow test. Finally, single phase gas flow should occur both in the reservoir and the wellbore for any meaningful analysis of the data to be possible. Introduction The development of the natural gas reserves which are trapped in tight (low permeability) rocks is essential to the nation. In recognition of this fact, the Federal Energy Regulatory Commission announced on February 11, 1980 (Docket No. RM79-76) special incentive price for natural gas produced from the tight sands. The Department of Energy estimates that 5.66 × 10 to the 12th m3 (200 tcf) of natural gas is trapped in the tight formations within the United States, compared to proven domestic natural gas reserves of 5.66 × 10 to the 12th m3 (200 tcf) from the conventional sources, indicating the need for emphasis on the development of these resources in a timely and effective fashion. The need for an increased gas supply and the development of a secure source of natural gas supply has led the petroleum industry to sharply increase its efforts in search of new gas reserves. Consequently, the development of tight, dirty sand reservoirs is increasing in the areas previously considered uneconomical. The tight gas reservoirs of the Rocky Mountain Region of the United States, for example, generally are encountered in formations of large gross thickness and normally contain billions of cubic feet of gas per square mile. When these reservoirs are developed, the wells produce at uneconomical rates without stimulation. Therefore, most of these wells are stimulated at the time of completion. By far, the most common stimulation practice in the Rocky Mountain area is hydraulic fracturing of the wells. Most often, when the formation is below 914.4m (3000'), the created fractures are vertical. The producing behavior of these wells indicates a marked producing behavior of these wells indicates a marked decline in the flow rate over a relatively short period of time, followed by an extended period of period of time, followed by an extended period of production at a very slowly declining rate. Such production at a very slowly declining rate. Such behavior of these wells in light of conventional or traditional concepts may cause undue pessimism or encourage bad investment without proper analysis. To improve confidence and investment decisions then, a re-evaluation of traditional concepts is appropriate. Pressure transient behavior of oil and/or gas wells is Pressure transient behavior of oil and/or gas wells is one of the most important diagnostic tools available to the petroleum engineer. Application of proper pressure transient analysis techniques should yield pressure transient analysis techniques should yield certain quantitative information regarding the well characteristics, which in turn will allow better understanding of the future producing behavior of these wells." @default.
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• W2020909721 date "1980-09-21" @default.
• W2020909721 modified "2023-09-27" @default.
• W2020909721 title "Computerized Pressure Transient Data Analysis For Vertically Fractured Tight Gas Wells" @default.
• W2020909721 doi "https://doi.org/10.2118/9345-ms" @default.
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