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  • ENS5566 Reservoir Engineering

    Edith Cowan University
    School of Engineering
    Reservoir Engineering ENS5566 
    

    Theory exercises-Part2/2

    Important Information:

    1. Answer ALL
    2. Ensure you put your name on ALL material to be submitted as part of you answer.
    3. State any/all assumptions made.
    4. This is an open book exercise

    Q1) A dry gas reservoir has produced as follows (70 Marks):

    Date

    Cumulative production

    MM SCF

    Static Res. Pressure psia

    07-Jan-65

    0

    07-Jan-66

    1800

    3461

    09-Jan-67

    3900

    3370

    10-Jan-68

    5850

    3209

    11-Jan-69

    9450

    3029

    Data

    Reservoir Temperature T= 100°F

    Gas Gravity SG= 0.68

    1. Determine the original pressure and original gas in place.
    2. What will be the average reservoir pressure at the completion of a contract calling for delivery of 10 MM SCF per day for 5 years (in addition to the 9,450 MM SCF produced to 11-Jan-69?)

    Q2) A gas reservoir without water drive contains 500 million standard cubic feet of gas at an original pressure of 3,000psia. How much gas has been produced when the reservoir pressure has declined to 2,900 psia. Use Bgi and Bg for the initial and 2,900 psia pressure as 0.0010 and 0.0011 bbl/scf. (30 Marks)

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