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C3 well performance

Designed & Presented by

Mr. ĐỖ QUANG KHÁNH, HCMUT

12/2010

Đỗ Quang Khánh – HoChiMinh City University of Technology
Email: dqkhanh@hcmut.edu.vn or doquangkhanh@yahoo.com

1


Production & Completion System

System analysis allows PE to both analyze production and design well completion.
(After Mach et al. 1979)


Production & Completion System
Production performance involves matching up the following three aspects:
(1)Inflow performance of formation fluid flow from formation to the wellbore.

(2)Vertical lift performance as the fluids flow up the tubing to surface.
(3)Choke or bean performance as the fluids flow through the restriction at
surface.

Pressure loss distribution.


Production & Completion System

Effect of skin on bottomhole pressure Pwf


Linear flow of liquid through rock

(2.1)


Flow Regimes



Flow Regimes - Comparison
Pressure profile at location r = ri

Pressure

Steady-state Flow

Semisteady-state Flow

Unsteady-state Flow

Time


Time to feel boundary
 Assumed well is completed in a circular reservoir with
drainage radius of re, then the time it takes for pressure
transient to reach the boundary is:


(2.2)

ct is the total system compressibility


IPR curves


Single-phase liquid flow

(2.3)

(2.4)


Single-phase gas flow

(2.5)

(2.6)


Single-phase gas flow

(2.7)

(2.8)


Gas PVT data


Gas Well Performance
 Rawlins and Schellhardt

(2.9)

(2.10)


Rawlins and Schellhardt analysis
LOG-LOG Plot

or

Slope = 1/n

AOF
Gas flow rate qg


Gas Well Performance
 Houpeurt (non-Darcy flow effects)
(2.11)

(2.12)


Gas Well Performance
 Houpeurt (non-Darcy flow effects)
(2.13)

 Jones, Blount, and Glaze
(2.14)


Graph to determine a and b

or

Slope = b

Intercept = a

Gas flow rate qg


Oil Well Performance
 Vogel IPR

(2.15)

 Fetkovich

(2.16)

(2.17)


Oil Well Performance
 Jones, Blount, and Glaze (non-Darcy effects)
(2.18)

(2.19)


Oil Well Performance
 Vogel’s IPR for two-phase flow
(2.20)

(2.21)

(2.22)


Determination of J
 J is determination depends on the flowing bottom-hole
pressure of the test point
(2.23)

(2.24)


Wellbore Flow Performance
 Pressure drop in the wellbore
(2.25)

Kinetic energy correction factor

For most practical applications, assume W = 0, a = 1

Work done

Irreversible energy losses

(2.26)


Pressure drop in pipe
 Pressure drop for any fluid at any pipe inclination:
(2.27)


Flow Through Chokes
 Wellhead choke controls the surface pressure and production rate

from a well
 Chokes usually are selected so the fluctuations in the line pressure
downstream of the choke have no effect on the production rate

 Flow through the choke at critical flow conditions.
 The flow rate is a function of upstream or tubing pressure only
(downstream pressure must be approx. 0.55 or less of the tubing

pressure)


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