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)

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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