1. introduction to re - uncensored

VIETNAM OIL & GAS GROUP

PETROVIETNAM UNIVERSITY

INTRODUCTION

Lecturer : Nguyen Viet Khoi Nguyen, MSc.

Email : [email protected]

Website : www.pvu.edu.vn

Reservoir EngineeringNguyen Viet Khoi Nguyen, MSc

References

1. Công nghệ mỏ ứng dụng, Huỳnh Thanh Sơn & Lê

Phước Hảo, NXB ĐHQG Tp.HCM, 2003.

2. Applied Petroleum Reservoir Engineering, Craft

B.C, Hawkins M.F and Terry R.E, Prentice-Hall Inc.,

New Jersey, 1991. (here)

3. Petroleum Engineering Handbook for the Practicing

Engineer Vol.1, Mian M.A, PennWell Publishing Co.,

Oklahoma, 1992.

4. Reservoir Engineering Handbook (4th edition), Tarek

Ahmed, Gulf Professional Publishing, 2010. (here)

5. Multiphase Flow in Wells, James P. Brill & Hemanta

Mukherjee, SPE, 1999. (here)

2

D:/Google Drive (PVU)/Petroleum References/Discipline Library/B. C. Craft/Applied Petroleum Reservoir Engineer (93)

D:/Google Drive (PVU)/Petroleum References/Discipline Library/Tarek Ahmed/Reservoir Engineering Handbook (4th (139)

D:/Google Drive (PVU)/Petroleum References/Discipline Library/James P. Brill/Multiphase Flow in Wells (72)


Introduction

4

What is Reservoir?


Tasks of Reservoir Engineer

5

Estimation of HC Volumes in place

Calculation of recovery factors

Estimation of recovery time


History of RE

6

− In 1937, Muskat tried to attempt to

organize the concepts of fluid flow in

porous media into a formal discipline

from research of:

Fancher et al. – fundamental rock

properties. (1933)

Schilthuis – Subsurface samples of oil and

gas for measuring fluid properties. (1935)


History of RE

7

− 1942, Buckley and Leverett contributed to

the understanding of oil and gas

displacement

− 1946, Tarner showed the equation for

dertermining the recovery of oil under

solution-gas drive

− 1949, Everdingen and Hurst solved the

equations to predict the flow of water from

an aquifer (included paper of Hurst in 1943)


History of RE

8

− 1955, Moore reviewed the previous 25

years of RE history and look forward to the

next 25 years.


History of RE

9

− About the Decline curves to model

production history and forecast production

From 1908 to 1943, many papers were

introduced and improved the method by a lot of

experts in oil industry.

1945, Arps formalized this technique and

improved in 1956


History of RE

10

Classification of Production Decline Curves


History of RE

11


Drive Mechanisms

12

Solution-Gas Drive

Gas-Cap Drive

Waterdrive

Gravity Drive

Compaction Drive

Imbibition Drive

Combination Drive


Trapping Mechanisms

13

Structural Traps


Trapping Mechanisms

14

Structural Traps


Trapping Mechanisms

15

Stratigraphic Traps


Trapping Mechanisms

16

Fault Traps


Trapping Mechanisms

17

Hydrodynamic Traps


Trapping Mechanisms

18

Combination Traps


Trapping Mechanisms

19

Combination Traps


Estimating Reserves

20


Estimating Reserves

21

7758 1 wi

R F

oi

Ah SN R

B


Estimating Reservoir Bulk Volume

22

Calculating the Reservoir Bulk Volume

Trapezoidal rule:



23


Trapezoidal rule:

1 1

1

1

2

n

i i i i

i

Ah h h A A

1 2 1

12 ... 2

2n nAh h A A A A



24


Example 1.1: Calculate the reservoir volume

Depth, ft Area, acres

2,900 20

2,925 35

2,950 50

2,975 70

3,000 95

3,025 110

3,050 130


Estimating Reserves

25

Calculating the Reserves

Example 1.2: Geological contouring of a yet to

be explored region indicates that the drainage

area of a potential HC reserves is given from

example 1. The porosity of nearby regions in

the same zone is 23% and the water

saturation is 20%. If the formation volume

factor is assumed to be 1.2 bbl/STB and the

recovery factor is estimated to be 0.19.

Calculate the potential reserves


Estimating Gas Reservoir

26

Similar to oil reservoirs, to estimate the gas

in place:

43560 1 wi

i

gi

Ah SG

B



27

Remaining gas at the time of abandonment:

43560 1 wi

a

ga

Ah SG

B



28

Calculating the gas reserves:

1 1

43560 1R i a wi

gi ga

G G G Ah SB B

43560 1 wi

R F i F

gi

Ah SG R G R

B

ga gi

F

ga

B BR

B



29

Exercise 1.1:


HC Phase Behavior

30


HC Phase Behavior

31


HC Phase Behavior

32

Black Oil


HC Phase Behavior

33

Black Oil

Liquid-shrinkage curve for black oil


HC Phase Behavior

34

Black Oil

Liquid-shrinkage curve for black oil


HC Phase Behavior

35

Volatile Oil


HC Phase Behavior

36

Volatile Oil

Liquid-shrinkage curve for volatile oil


HC Phase Behavior

37

Liquid-shrinkage for crude oil systems


HC Phase Behavior

38

Retrograde gas – Condensate


HC Phase Behavior

39

Wet gas


HC Phase Behavior

40

Dry gas


HC Phase Behavior

41

Effect of Changing the System Composition:


More information

42

Formation Volume Factor (FVF)

Oil:

Oil Volume in Res

Oil Volume in Stock TankoB


More information

43


Gas:

Rg

sc

VB

V

R

znRTV

p

sc scsc

sc

z nRTV

p


More information

44


Gas:

0.0282g

zTB

p

1. introduction to re - uncensored

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