PE 360…..Natural Gas Reservoir Engineering
Course Outline-----Fall 2005

Text:  Gas Reservoir Engineering by John Lee and Robert Wattenbarger, SPE Texbook series vol 5, 1996

Week of

Subject matter

Reading assignment

Homework assignment

1

Aug 22 - 28
  1. Types of Gas Reservoirs: Characterizations by phase diagrams
  2. Gas properties calculations

        a.   Dry gas properties

Chapter 10 figs 10.1 – 10.3

Chapter 1: pages 1-31

 

Hmwk set # 1

Solve 1.2 and 1.4

2

Aug29 - Sept 4

        b.   Wet gas and condensate gas (above DP) properties (recombination calculations)

        c.    Condensate gas properties below DP  (See PVT Analysis).

Chapter 10: pages 230 – 234, Hand-out notes

Hmwk set #2

To be assigned  (recombination problems)

3

Sept 5- 11
  1.  IGIP and Reserves calculation by volumetric Methods: 

a.        Calculation of pore volumes and IGIP for gas reservoirs

b.       Gallons of total liquids in place for gas condensate reservoirs (see PVT Analysis)

Labor day holiday on Monday, Sept 6.          230 – 234,

 Hmwk set #3

Solve 10.1 and 10.2 + additional problems to be assigned

4

Sept 12 - 18
  1.       IGIP and Reserves by Material Balance Methods:

a.        For volumetric gas reservoirs (dry, wet and condensate)

b.       Gas reservoirs with water influx

c.        Geo-pressured dry and wet gas reservoirs

Test #1 on Monday

Pages 235-236

248-251

245-248

 Hmwk set # 4

Solve 10.4, and other assigned problems

5

Sept 19 - 25
  1.  PVT Analysis

Hand-out notes

 Hmwk set #5

PVT problem to be assigned

6

Sept 26 - Oct 2
  1. Flow of real gases through porous media
    1. Concept of fluid Potential and Real Gas pseudo-pressure m(p)
    2. Generalized Darcy’s law for gases 

Handout notes

 Hmwk set # 6

Solve Hand-out problems. (Darcy's law)

7

Oct 3- 9
  1. Steady flow of gases

Darcy’s law for gases under steady flow….P-method, P-squared method, and m(p) method

STUCO FREE DAY ON FRIDAY Oct 7

Hand-out notes

 

8

Oct 10- 16

SPE CONVENTION. NO CLASSES ON MON. & WED.

Mid-term Exam on Friday Oct 14

 

 

9

Oct 17 - 23
  1. Pseudo-steady flow of gases
    1. Theoretical equations and solutions in terms of P, P-squared, and m(p).

                Houpeurt analysis technique in terms of P, P-squared, and m(p).

 94 - 96, Hand-out notes

 Hmwk set # 7

Solve 5.2, 5.6

10

Oct 24 - 30

9.        Stabilized flow tests……Application of steady/pseudo-steady flow equations:

    1. Flow after flow tests, calculation of AOF
    2. Isochronal Test and Modified Isochronal Test

168-190

Hmwk set # 8

Solve 7.4, 7.5, 7.6

11

Oct 31- Nov 6
  1. Gas Well Inflow performance relationships (IPR) according to the steady state equation.

               Gas outflow performance curves and tubing performance curves

73 – 77, 94 - 96

 

 Hmwk # 9

Solve 4.8, 4.9, 4.10

12

Nov 7 - 13
  1. Transient flow of gases: Diffusivity equation by the P, P-squared and m(p) representations.
  2. Solutions to the diffusivity equation:
    1. Use of dimensionless variables

Chapter 5: pages 81-106

Test # 2 on Fri.

 

 

13

Nov 14 - 20
    1. Line source solution
    2. Constant terminal pressure solution (Van Everdingen and Hurst solutions)

81-106

Hmwk set # 9 : Solve 4.8, 5.2

 

14

Nov 21- 27

                        d.    Applications to Natural water Influx in Gas reservoirs.

THANKSGIVING HOLIDAY begins Wed.

 

15

Nov 28 – Dec 4
  1. Constant terminal rate solution

            Applications in Deliverability testing and Well testing

 

 

 Hmwk set # 10

To be assigned

16

Dec 5 - 11
  1. Gas Flow in Wellbores: Fundamental energy balance equations.
    1. Calculation of Static bottomhole pressures by:

·         Average temperature and average Z-factor method

·         Poettmann’s method

·         Cullender-Smith method

b.       Calculation of flowing bottomhole pressures

·         Average temperature and average Z-factor method

·         Sukkar-Cornell method

·         Cullender-Smith method

Chapter 4: 58-61 , 61-66

 Hmwk set # 11.

Solve 4.1, 4.2

17

Dec 12- 18

FINAL EXAM (Optional)