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cumulant
Gas Production
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Advanced Gas Material Balance, in Simplified Format
Advanced Gas Material Balance, in Simplified Format,10.2118/2009149,Journal of Canadian Petroleum Technology,Samane Moghadam,Oluyemisi Jeje,Louis Mat
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Advanced Gas Material Balance, in Simplified Format
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Samane Moghadam
,
Oluyemisi Jeje
,
Louis Mattar
Material balance has long been used in reservoir engineering practice as a simple yet powerful tool to determine the OriginalGasInPlace (G). The conventional format of the gas material balance equation is the simple straight line plot of p/Z versus cumulative
gas production
(Gp) which can be extrapolated to zero p/Z to obtain G. The graphical simplicity of this method makes it very popular. The method was developed for a "volumetric" gas reservoir. It assumes a constant pore volume of gas and accounts for the energy of gas expansion, but it ignores other sources of energy such as the effects of formation compressibility, residual fluids expansion and aquifer support. It also does not include other sources of gas storage such as connected reservoirs or adsorption in coal/shale. In the past, researchers have introduced modified gas material balance equations to account for these other sources of energy. However, the simplicity of the p/Z straight line is lost in the resulting complexity of these equations. In this paper, a new format of the gas material balance equation is presented which recaptures the simplicity of the straight line while accounting for all the drive mechanisms. It uses a p/Z** instead of p/Z. The effect of each of the mentioned drive mechanisms appears as an effective compressibility term in the new gas material balance equation. Also, the physical meaning of the effective compressibilities are explained and compared with the concept of drive indices. Furthermore, the gas material balance is used to derive a generalized rigorous total compressibility in the presence of all the abovementioned drive mechanisms, which is very important in calculating the pseudotime used in rate
transient analysis
of production data.
Journal:
Journal of Canadian Petroleum Technology  J CAN PETROL TECHNOL
, vol. 50, no. 1, pp. 9098, 2009
DOI:
10.2118/2009149
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References
(3)
A New Method for Computing PseudoTime for Real Gas Flow Using the Material Balance Equation
(
Citations: 2
)
N. M. A. RAHMAN
,
L. Kok
,
K. Zaoral
Journal:
Journal of Canadian Petroleum Technology  J CAN PETROL TECHNOL
, vol. 45, no. 10, 2006
MaterialBalance Techniques for CoalSeam and Devonian Shale Gas Reservoirs With Limited Water Influx
(
Citations: 5
)
G. R. King
Journal:
SPE Reservoir Engineering
, vol. 8, no. 1, pp. 6772, 1993
Improvements to Reservoir MaterialBalance Methods
(
Citations: 8
)
J. L. Pletcher
Journal:
SPE Reservoir Evaluation & Engineering  SPE RESERV EVAL ENG
, vol. 5, no. 1, pp. 4959, 2002