2. WELL PERFORMANCE ANALYSIS
In The Name of God
P.O.G.C
Subject of Conference
WELL PERFORMANCE ANALYSIS

3. Outlines
Introduction
Inflow performance relationship (IPR)
Tubing performance relationship (TPR)
Wellhead performance relationship (WPR)

4. Goals of Well Analysis Determination of the flowrate
To determine under what flow conditions well will cease to produce.
To select the most economical time for the installation of artificial lift
To optimize the well conditions and system geometry
To analyze each component in the well system

5. production system Sales Gas surface facility Separator Stock tank
vertical well
porous media 5

6. Inflow Performance Relationship (IPR)
Inflow performance relationship (IPR) is defined as the relation between the surface flowrate (q) and bottomhole flowing pressure (Pwf).
IPR curves are used to analyze the deliverability of wells by estimating the production rate for a given bottomhole flowing pressure and vice versa and also reflect the ability of the reservoir to deliver fluid to the wellbore.

7. IPR Curve 1) Straight line (Constant PI)
2) A curve which shows that the PI is decreasing with rate
3) A combination of 1 and 2.

8. Constant PI Occurs for single phase liquid flow
Production rate is proportional to the pressure drawdown

9. IPR Equation for Multiphase Flow
Vogel’s Equation
Fetkovich’s Equation
Klins and Majcher Equation
Pudjo Sukarno’s Equation

10. Fetkovich’s Equation
Using data from multirate tests on 40 different oil wells in six fields, Fetkovich showed that the following approach was suitable for predicting performance:
where ≤ n ≤ 1.0
Log
This can be expressed in a form similar to Vogel’s IPR.
(Pr2 – Pwf2) psia
1/n
Flowrate ( q ) STB/d
Log

11. IPR Curve for Multiphase Flow

12. Effective Parameters on Inflow Performance
Dow point and bubble point pressure
Reservoir pressure depletion
Skin effect

13. Tubing Performance Relationship (TPR or VFP)
Tubing performance may be defined as the behavior of a well in giving up the reservoir fluids to the surface.
relation between the surface flowrate (q) and tubing intake ressure(Pwf).
Flowing bottomhole pressure (tubing intake pressure) for each production rate equals total pressure drop through the tubing and any bottomhole restriction and wellhead pressure.
Pwh
Pwf Q

14. Pressure Drop In the Vertical Well
Hydrostatic pressure drop
Friction pressure drop

15. Vertical Two-Phase Flow Pattern
Bubble flow (A)
Slug flow (B)
Transition flow (C)
Annular-mist flow (D)

16. Flow Regimes

17. Change in phase behavior in the production tubing

18. Natural flow
Accrue when the wellbore flowing pressure and tubing intake pressure (at perforation depth) are equal, TPR and IPR curves intersect together. The intersection of TPR and IPR curves called natural flow point.

19. Variables that Effects on Natural Flow
Wellhead pressure
Gas/liquid ratio
Tubing size
Static pressure &…

20. Effect of Wellhead Pressure

21. Effect of Gas/Liquid Ratio

22. Effect of Tubing Diameter

23. Effect of the Skin

24. BHSP
5900
5500
5000
4500
4100

25. Wellhead Performance
By using of the wellhead performance can show in which range of flowrate in the well column, the hydrostatic pressure drop is more than friction pressure drop.

26. production system Sales Gas Separator Stock tank vertical well
porous media 26

27. IPR & TPR & WPR
Pwh
IPR
Pressure
TPR
WPR
Rate

28. Choke Performance
The main function of a choke is to dissipate large amounts of potential energy (i.e., pressure losses) over a very short distance.
Two types of two-phase flow can exist in a choke :
P2/P1 ≤ %50 = RC
Critical flow
Subcritical flow
P2/P1 > %50 = RC
P1 = Wellhead ( upstream) pressure
P2 = downstream pressure

29. CPR and WPR
The intersection of the WPR and choke performance curve defines the rate of natural flow for the given choke size.

30. Gilbert and Ros

31. Recommend
Basic requirement for well performance analysis is the ability to determine , so it is required to determine BHP using surface data
Determine the best correlation to predict the fluid behavior in well column same as culender smite or duckler &…
Examine the quality of separator tests using daly reports of SPGC

32. Thanks for your attention