1. What is primary production, secondary and tertiary production?
2. Please draw a typical black oil phase diagram, label the important points and lines talked about in the class and specify the isothermal production procedure for a saturated reservoir.
3. Experiments were made on a bottom hole sample of the reservoir liquid taken from the LaSalle Oil Field to determine the solution gas and the formation volume factor as functions of pressure. The initial bottom-hole pressure of the reservoir was 3600 psia, and the bottom-hole temperature was 160°F; so all measurements in the laboratory were made at 160°F. The following data, converted to practical units were obtained from the measurements:
|
Pressure
psia
|
Solution gas SCF/STB at
14.7 psia and 60o F
|
Formation Volume
Factor
bbl/STB
|
|
3600
|
567
|
1.310
|
|
3200
|
567
|
1.317
|
|
2800
|
567
|
1.325
|
|
2500
|
567
|
1.333
|
|
2400
|
554
|
1.310
|
|
1800
|
436
|
1.263
|
|
1200
|
337
|
1.210
|
|
600
|
223
|
1.140
|
|
200
|
143
|
1.070
|
Please do the following based on the data given:
a. Please plot the gas in solution versus pressure
b. Please determine if the reservoir was saturated or not in its original condition? Does the reservoir originally have a gas cap? Please explain your answers.
c. In the region of 200 to 2500 psia, determine the solubility of the gas from your graph in SCF/STB/psi.
d. Plot the formation volume factor versus pressure. Explain why the slope is negative and smaller when pressure is above the bubble-point pressure compared with the slope when pressure is below the bubble point pressure?
e. If the reservoir contains 250 MM reservoir barrels of oil initially, what is the initial number of STB in place?What is the initial volume of dissolved gas in standard condition?