FACULTY OF CHEMICAL ENGINEERING

OIL AND GAS SIMULATION LABORATORY

(CGE 656)

NAME: MOHAMAD MASRUL BIN ISMAIL (2013866234)

RUSDI BIN SAIDI (2013613872)

CLASS: EH 223 5B

PART : PART 5

TASK : ASSIGNMENT PROSPER

INTRODUCTION

PROSPER is a well performance, design and optimisation program for modelling

most types of well configurations found in the worldwide oil and gas industry today.

PROSPER can assist the production or reservoir engineer to predict tubing and pipeline

hydraulics and temperatures with accuracy and speed. PROSPER's sensitivity calculation

features enable existing well designs to be optimised and the effects of future changes in

system parameters to be assessed.

PROSPER is designed to allow building of reliable and consistent well models, with

the ability to address each aspect of well bore modelling viz; PVT (fluid characterisation),

VLP correlations (for calculation of flowline and tubing pressure loss) and IPR (reservoir

inflow). By modelling each component of the producing well system, the User can verify

each model subsystem by performance matching. Once a well system model has been tuned

to real field data, PROSPER can be confidently used to model the well in different scenarios

and to make forward predictions of reservoir pressure based on surface production data.

With PROSPER detailed flow assurance can be studied at well and surface pipeline

level. PROSPER provides unique matching features which tune PVT, multiphase flow

correlations and IPR to match measured field data, allowing a consistent model to be built

prior to use in prediction .

OBJECTIVES

The objectives of the report are to:

1. To perform the sensitivity analysis.

2. To choose the optimum tubing size.

3. To provide safe and cost effective design of well completion for all producers,

maximize drainage area but staying at the down dip as much as possible to avoid early

gas or water breakthrough and to allow future wells intervention and re-completion

for any production enhancement activities.

METHODS

1. Opened the PROSPER software. If the well model is loaded, clicked the main menu

bar File/New.

2. Clicked PVT from the main menu bar and pressed Input Data. Filled the data needed

like solution GOR, oil gravity, gas gravity, water salinity and clicked Match Data.

Make sure that the units entered are correct.

3. Entered the temperature of PVT Match Data, bubble point, pressure, GOR, oil

formation volume factor and oil viscosity for each point PVT.

4. Clicked Done, Regression and Match All. Clicked OK as soon as the calculation

stops.

5. Next, press System/Equipment (Tubing etc).

6. Clicked All and then Edit, enter the deviation survey and pressed Done.

7. The temperature of surroundings at wellhead was entered.

8. Enter 8 BTU/h/ft²/Deg for Overall Heat Transfer Coefficient and pressed Done.

9. Entered the completion details in the completion table in downhole equipment.

10. Clicked tubing, restriction, tubing and casing in the type column.

11. Make sure the depth and internal diameter entered should be at the bottom of each

tubing section. If the tubing or casing used is stainless steel entered the roughness

0.0006 inches. Then, clicked Done.

12. Filled the wellhead depth and temperature in Geothermal Gradient.

13. In the Downhole Equipment, entered the bottom depth of completion, reservoir

temperature and 8 BTU/h/ft²/Deg for Overall Heat Transfer Coefficient and pressed

Done. Do not change the default values for Average Heat Capacities.

14. For Inflow Performance Relationship (IPR), clicked System then Inflow Performance.

15. Clicked PI Entry and the reservoir temperature, reservoir pressure, water cut and total

GOR of reservoir were entered.

16. Next, pressed Input Data and entered 4.00 as estimated value for PI Entry. Clicked

Calculate and PROSPER will calculate and plot the IPR curve. Pressed Finish and

then clicked Done.

17. Then, clicked Matching and VLP/IPR. The data for Well Test such as the date of the

well test, Wellhead Flowing Pressure or Tubing Head Pressure, Wellhead Flowing

Temperature or Tubing Head Temperature, Water Cut, Liquid Rate, Downhole Gauge

Depth, Downhole Gauge Pressure and GOR. Clicked Done.

18. Clicked Match Data and then click Estimate U Value and ensure that the Overall Heat

Transfer Coefficient is in the range of 1 – 20 BTU/h/ft²/Deg.

19. Clicked OK and Done.

20. Pressed System/Equipment (Tubing etc). Changed the estimated value of Overall

Heat Transfer Coefficient to the calculated value and then, click Done.

21. Calculate/System and IPR/VLP were pressed.

22. The wellhead flowing pressure and water cut were entered.

23. Continue and Done were pressed.

24. Clicked Continue, Calculate and OK.

25. Pressed Plot and the curve will showed up on the screen.

26. Clicked Save the file and it will be saved in four different files. The most important file

is the one with the name Out which contains all the data (input, sensitivity and results).

RESULT/DISCUSSION

Figure 1

Figure 2

Figure 3

Figure 4

DISCUSSION

Based on Inflow Performance Relation (IPR) plot-Production Index (PI) entry (Figure

2), the value of absolute open flow (AOF) is 6816.9 STB/day and the maximum pressure is

2391 psig. From system plot (Figure 3), the intersection value between the IPR and Tubing

Performance Relation (TPR) is 2050 STB/day. The optimum tubing size for this experiment

was 7 inches. On the other hand, for the system wellhead (Figure 4), the intersection between

the wellhead pressure and the wellhead temperature is 1000 STB/day.

CONCLUSION

Conclusively, the absolute open flow (AOF) is effected by the tubing size where the

optimum tubing size is 7 inches. Furthermore, the sensitivity analysis Inflow Performance

Relation (IPR) versus Tubing Performance Relation (TPR) was performed. This sensitivity

analysis is vital in optimization of tubing size and tubing materials due to at different

production rate, the optimization of tubing size is different. So, the higher the production rate,

the higher the lifting efficiency indicates the good of tubing optimization.

REFERENCES

1. Petex-Petroleum Experts, Prosper. Retrieved from www.petex.com.

2. Prosper Laboratory manual.