Advanced Reservoir Management and Engineering by Tarek Ahmed PhD PE, Nathan Meehan

By Tarek Ahmed PhD PE, Nathan Meehan

Content material:
Front-matter

, Pages i,iii
Copyright

, Page iv
Preface

, Page ix
Chapter 1 - good checking out Analysis

, Pages 1-226
Chapter 2 - Water Influx

, Pages 227-279
Chapter three - Unconventional fuel Reservoirs

, Pages 281-432
Chapter four - functionality of Oil Reservoirs

, Pages 433-483
Chapter five - Predicting Oil Reservoir Performance

, Pages 485-539
Chapter 6 - creation to more advantageous Oil Recovery

, Pages 541-585
Chapter 7 - fiscal Analysis

, Pages 587-649
Chapter eight - monetary Analysis

, Pages 651-660
Chapter nine - Professionalism and Ethics

, Pages 661-682
References

, Pages 683-688
Index

, Pages 689-702

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Example text

Recall that the gas formation volume factor Bg as expressed in bbl/scf is given by: Solution (a) The m(p) method: Step 1. Calculate tD:  0:000264ð50Þð4Þ ð0:2Þð0:0168Þð6:25 3 1024 Þð0:322 Þ 5 279; 365:1 Bg 5 tD 5 ψD 5 0:5½lnðtD Þ 1 0:80907Š 5 0:5½lnð279; 365:1Þ 1 0:80907Š 5 6:6746 m(pwf) by applying   1422Qg T ψD mðpwf Þ 5 mðpi Þ 2 kh ! 1422ð7454:2Þð600Þ 5 ð198 3 106 Þ 2 6:6746 ð50Þð10Þ 5 113:1 3 106 The corresponding value of pwf 5 1200 psi (b) The p2 method: Step 1. Calculate ψD by applying Eq.

140) with the gas properties evaluated at: p5 p r 1 pwf 2 where Using the same technique identical to that described previously for liquids gives the following exact solution to the diffusivity equation: Qg 5 53 The gas properties Z and μ are evaluated at: @2 mðpÞ 1 @mðpÞ φμct @mðpÞ 1 5 @r 2 r @r 0:000264k @t For semisteady-state flow, the rate of change of the real-gas pseudopressure with respect to time is constant. 138) where Qg 5 gas flow rate, Mscf/day k 5 permeability, md Bg 5 gas formation volume factor at an average pressure, bbl/scf The gas formation volume factor is given by the following expression: Bg 5 0:00504Z T =p Qg 5 gas flow rate, Mscf/day T 5 temperature,  R k 5 permeability, md In deriving the flow equations, the following two main assumptions were made: Two approximations to the above solution are widely used.

P(rw, t). There are two commonly used forms of the constant-terminal-rate solution: (1) the Ei function solution; (2) the dimensionless pressure drop pD solution. These two popular forms of solution to the diffusivity equation are discussed below. The Ei Function Solution. , Eq. 66): pðr; t Þ 5 pi 1 ! 77) The mathematical function, Ei, is called the exponential integral and is defined by: ðN e2u du u x ! x x2 x3 5 lnx 2 1 2 1? 1! 78) Craft et al. 19, respectively. The Ei solution, as expressed by Eq.

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