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- W2072438270 abstract "Abstract This paper presents the concept of dynamic characterization of the carbonate gas condensate reservoirs, which mainly involves production analysis, material balance method and well test interpretation in combination with geological analysis results. This systematic technique can be fully integrated with the long-term low accuracy data of dynamic production and short-term high-precision data of transient well testing, in order to correctly evaluate the properties of the reservoir around the well, such as the formation permeability, well skin, oil drainage radius and dynamic reserve and so on. Then based on the results, the dynamic characterization model can be built to predict the performance of the wells. Take the development pilot blocks in Tazhong No.1 carbonate gas condensate field as an example to elaborate the details of this method. The results show that the new material balance equation can accurately calculate the original gas in-place of carbonate reservoirs in both fracture system and matrix system; the combination of analytical and/or numerical production analysis and well test analysis with production data constrained can correctly evaluate the formation permeability, well skin, and dynamic reserve; These three methods are integrated and constrained with each other, which can generate a reliable result; Both the material balance method and the dynamic characterization model are applied to the performance prediction of the wells and the block. This systematic technique has been successfully applied to Tazhong No.1 Carbonate Gas Condensate Field Pilot Pre-Development Plan with 1 Billion Cube, which provides a reliable foundation for the effective development of Tazhong No.1 gas field. Introduction Generally speaking, material balance equation (MBE) is often used by the reservoir engineers as a quick method to calculate the reservoir reserves (Havlena, D et al [1963], Alvarado G et al [1992], Brian J B.[2003]). But because the fracture compressibility and irreducible water saturation are different from those of the matrix system in the carbonate gas condensate reservoirs, which should be considered in material balance equation for the carbonate gas condensate reservoirs (Gherson Penuela et al[2001]). Also, material balance method has been studied as a method for reservoir dynamic characterization (M. Abu El Ela et al [2007]), and it is one of the methods for the systematic dynamic characterization and plays an important role in it. Integrated with the geologic understandings, production analysis (PA) can use the long-term low accuracy production data to correctly evaluate the properties of the reservoir around the well. Production analysis can integrate the production rate data with the bottomhole pressure data. Firstly the Fetkovich (Fetkovich, 1980), Blasingame (Blasingame et al[1989], [1991]), Agarwal-Gardner (Agarwal, R.G et al[1998]) type curves method and the flowing material balance (F.M.B) method (Mattar L et al[1998]) are used for analysis, then the analytical or numerical radial flow model is used to match the production history in order to correctly evaluate the reservoir. Without well shutdown or formation test, all reservoir parameters evaluated from well test can also obtained by production analysis. Also, its type curve method can indicate the reservoir type and well performance problems (D.M. L. Mattar et al [2003]). Well test analysis has been one of the methods for reservoir evaluation for a long time, it mainly uses the short-term high-precision data of transient well testing, especially the well buildup test analysis, to evaluate the reservoir parameters around the wells which are important for the geologic modeling and reservoir simulation. So well test is very important for the carbonate reservoirs (A.C. Gringarten et al[2006], Freddy H. E. et al[2007])." @default.
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- W2072438270 date "2009-10-19" @default.
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- W2072438270 title "Application of a Systematic Technique for the Dynamic Characterization of Carbonate Gas Condensate Reservoirs" @default.
- W2072438270 doi "https://doi.org/10.2118/125356-ms" @default.
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