TUTORIAL IPM 8 P-01

Constructing an oil well model

OBJECTIVES

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- Familiarize the user with IPM 8 PROSPER and the input of data. - Perform basic calculations in PROSPER.- Construct an oil naturally flowing well and obtain results.

EXPECTED CALCULATIONS

DATA

Considering a well head pressure of 400 psig and actual conditions of reservoir we would like to know: 1. Estimate oil production rate.2. Estimate flowing bottom-hole pressure.3. Estimate well head temperature.

PVT DATA

Variable

Solution GOR

Oil density

Gas gravity

Water salinity

430

34

0.73

85000

Scf/stb

API

ppm

Value Unit

DEVIATION SURVEY

Measured depthm

0

452

489

564

665

790

1896

2736

2885

2930

True vertical depth m

0

443.4

475.7

535

601.2

663.1

1145

1639.9

1706.4

1726.5

Temperature°F

80

163

Deviation Survey Geothermal gradient

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“U” (Overall heat transfer coefficient)It is used to calculate the heat transfer between the well and its surroundings.It is obtain from well test when well head temperature is available. In case of lack of well head temperature the following rule of thumb can be used:

Oil and water wells: 8 – 10 Btu/h/ft2/FCondensate wells: 5 – 7 Btu/h/ft2/FDry and wet gas wells: 1 – 3 Btu/h/ft2/F

DOWN-HOLE EQUIPMENT DATA

Description

Xmas tree

Tubing

Restriction

Tubing

Casing

Depth m

0

1000

1000

2700

2930

IDinch

2.992

2.75

2.992

6.366

Roughness inch

0.0006

0.0006

0.0006

0.0006

GEOTHERMAL GRADIENT

Overall heat transfer coefficient “U”: 8 BTU/h/ft2/F

Measure depthm

0

2930

TemperatureºF

80

163

IPR DATA

Variable

Reservoir pressure

Reservoir temperature

Water cut

Productivity Index

2571

163

0

3.5

psig

F

%

Stb/day/psi

Value Unit

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For a well head pressure of 400 psig and 0% water cut estimate:

RESULTS

Variable Value Units

Oil Rate

Flowing bottom hole pressure

Well head temperature

Stb/day

Psig

°F

Save the PROSPER file.