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• W4230581410 abstract "Drawdown Well Test Analysis for Multicomponent Hydrocarbon Systems L.G. Thompson; L.G. Thompson Rogaland Research Inst. Search for other works by this author on: This Site Google Scholar D.T. Vo D.T. Vo U. of Tulsa Search for other works by this author on: This Site Google Scholar Paper presented at the SPE Annual Technical Conference and Exhibition, Houston, Texas, October 1988. Paper Number: SPE-18126-MS https://doi.org/10.2118/18126-MS Published: October 02 1988 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Thompson, L.G., and D.T. Vo. Drawdown Well Test Analysis for Multicomponent Hydrocarbon Systems. Paper presented at the SPE Annual Technical Conference and Exhibition, Houston, Texas, October 1988. doi: https://doi.org/10.2118/18126-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 Annual Technical Conference and Exhibition Search Advanced Search SPE MembersAbstractDrawdown pressure and phase rate data from retrograde condensate reservoirs are analyzed to obtain estimates of individual phase molar composition, phase effective permeability and sandface saturation as functions of wellbore permeability and sandface saturation as functions of wellbore pressure (or total flowing time). The results of the latter two pressure (or total flowing time). The results of the latter two calculations are combined to construct an effective permeability/phase saturation relationship which reflects the permeability/phase saturation relationship which reflects the in situ reservoir flowing conditions. Data from reservoirs which are damaged, undamaged, stimulated, and for which the initial reservoir pressure is close to the dewpoint pressure are considered.Methods of estimating reservoir absolute permeability and skin factor from measured drawdown pressure/sandface phase rates and known initial reservoir fluid composition phase rates and known initial reservoir fluid composition are also presented. These methods do not presume availability of relative permeability curves, and as such should enjoy greater ease of applicability to field data analysis than presently available methods. presently available methodsIntroductionIn this paper, new methods are proposed for analyzing drawdown well test data for radial flow in hydrocarbon reservoirs which are best simulated using Compositional models; in particular, we focus our attention on analyzing data from retrograde condensate reservoirs. Our objectives are threefold:to examine the applicability of the Boltzmann variable (y = r2/t) as a correlating parameter for the dependent variables (i.e., pressure, phase saturation and phase composition n the reservoir. This is with a view to extending the ideas of Boe et al. and Aanonsen to multicomponent systems,to develop methods similar to Refs. 4–5 for generating reservoir phase effective permeability and phase saturation as functions of wellbore flowing pressure.to suggest practical methods of obtaining absolute permeability and mechanical skin factor without a priori knowledge of the relative permeability/phase saturation relationship as required in Refs. 6 and 7.The motivation for this study is obvious; in essence, we hope to determine effective permeability/phase saturation relationships which account for the dynamic reservoir flowing conditions of the reservoir fluids. By contrast, assumptions implicit in the determination of relative permeability curves by conventional laboratory methods are all too often arbitrary and unrealistic. Further, due to the high volatility of gas condensates and the high levels of reservoir pressure, conventional laboratory relative permeability determination (normally conducted at relatively low pressure levels) becomes less reliable.Available methods of obtaining absolute reservoir permeability and skin factor from drawdown retrograde permeability and skin factor from drawdown retrograde condensate well test data rely on the availability of accurate relative permeability data for the system. This presents a major obstacle to the practical application of these methods, since such data is seldom available. We present methods which utilize only measured pressure and phase rate data at the reservoir sandface. The suggested analysis methods are therefore more amenable to practical implementation.Since many of the presented procedures are directly applied to measured wellbore pressure and sandface rate data using point semilog slopes, they may be regarded as extensions of the well known Perrine - Martin analysis methods.MATHEMATICAL MODEL AND ASSUMPTIONSAll results presented in this work were generated using the one-dimensional compositional numerical simulator developed by Jones. Details and procedures used to verify the accuracy of the model are documented in Ref. 7. Briefly, the model is similar to that suggested by Coats. The Redlich-Kwong equation of state as modified by Zudkevitch and Joffe is incorporated to rigorously account for interphase mass transfer. The phases are assumed to be in thermodynamic equilibrium at each point in the reservoir. Isothermal flow is assumed.Except for the existence of a skin zone, the reservoir is modeled as a cylindrical (constant thickness) uniform porous medium. Gravitational effects are neglected and the well is assumed to penetrate the reservoir completely. The outer reservoir boundary is closed. The skin region is modeled by the inclusion of a zone of altered permeability (ks =/= k) close to the wellbore in the manner suggested by Hawkins formula, i.e.,(1)P. 211 Keywords: correlation, reservoir, pressure transient analysis, artificial intelligence, skin zone, phase saturation, phase mole fraction composition, sandface, upstream oil & gas, case 4 Subjects: Formation Evaluation & Management, Pressure transient analysis This content is only available via PDF. 1988. Society of Petroleum Engineers You can access this article if you purchase or spend a download." @default.
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• W4230581410 title "Drawdown Well Test Analysis for Multicomponent Hydrocarbon Systems " @default.
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