QA-RD7D
Section 1.
ISO: 9001/2008
Rev No.5
July 2009
S.I. Unit Formula Sheet
Page 1 of 4
Filled-in Kill Sheet Exercises - Gauge Problem Actions.
Gauge Problem Exercises are constructed from a completed kill sheet ‘filled-in’ with all relevant volume and
pressure calculations.
Each question is based on the strokes, pump rate, drill pipe and casing gauge readings at a specific point in time
during a well kill operation. Any one or a combination of these readings could indicate the action required.
Options are shown in the multiple-choice answers.
The casing and/or drill pipe pressures will only be relevant to the action if –


The casing and/or drill pipe pressures given in the question are below the expected pressures, or
The casing and/or drill pipe pressures given in the question are 70 psi or more above the expected
pressures.
Section 2.
Calculation Formula.
Abbreviations Used in this Document
BHP
BOP
3
kg/m
kPa
kPa/m
kPa/hr
LOT
m
m/hr
m/min
3
m
3
m /m
m3/min
3
m /stroke
MAASP
SICP
SIDPP
SPM
TVD
0.00981
1.
Bottom hole pressure
Blowout preventer
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
Kilogram per cubic metre
KiloPascal (pressure)
KiloPascal per metre
KiloPascal per hour
Leak-off Test
Metre
Metre per hour
Metre per minute
Cubic metre
Cubic metres per metre
Cubic metres per minute
Cubic metres per stroke
Maximum Allowable Annular Surface Pressure
Shut in Casing Pressure
Shut in Drill Pipe Pressure
Strokes per minute
True Vertical Depth
Constant factor
HYDROSTATIC PRESSURE (kPa)
2.
=
=
Mud Density kg/m3 0.00981 TVD m PRESSURE GRADIENT (kPa/m)
Mud Density kg/m3 0.00981 3.
DRILLING MUD DENSITY (kg/m3)
Pressure kPa TVD m
0.00981 or P
TVD P
.
International Well Control Forum
Inchbraoch House, South Quay Montrose, Angus DD10 9UA Scotland.
Tel: +44 1674 678120 Fax: +44 1674 678125
QA-RD7D
4.
Rev No.5
July 2009
ISO: 9001/2008
S.I. Unit Formula Sheet
Page 2 of 4
FORMATION PORE PRESSURE (kPa)
Hydrostatic Pressure in Drill String kPa SIDPP kPa 5.
PUMP OUTPUT (m3/min)
Pump Displacement m3/stroke x Pump Rate SPM 6.
ANNULAR VELOCITY (m/min)
P
O
A
7.
C
/
/
EQUIVALENT CIRCULATING DENSITY (kg/m3)
Annular Pressure Loss kPa
TVD m
0.00981
Mud Density kg/m
or
A
P
TVD 8.
L
P
.
Mud Density kg/m
MUD DENSITY WITH TRIP MARGIN INCLUDED (kg/m3)
Safety Margin kPa
TVD m
0.00981
Mud Density kg/m
or
S
M
TVD 9.
P Mud Density kg/m
.
NEW PUMP PRESSURE (kPa) WITH NEW PUMP RATE approximate
Old Pump Pressure kPa
N
P
R
SPM
O P
R
SPM
10. NEW PUMP PRESSURE (kPa) WITH NEW FLUID DENSITY approximate
Old Pump Pressure kPa
N
M
D
O M
D
/
/
11. MAXIMUM ALLOWABLE FLUID DENSITY (kg/m3)
Surface LOT Pressure kPa
Shoe TVD m
0.00981
LOT Mud Density kg/m
or
S
LOT P
S
TVD P .
LOT Mud Density kg/m
12. MAASP (kPa)
Maximum Allowable Mud Density kg/m
Current Mud Density kg/m
0.00981 Shoe TVD m
13. SICP (kPa)
Mud Density kg/m – Influx Density kg/m
x 0.00981 x Influx Vertical Height m SIDPP kPa International Well Control Forum
Inchbraoch House, South Quay Montrose, Angus DD10 9UA Scotland.
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QA-RD7D
Rev No.5
July 2009
ISO: 9001/2008
S.I. Unit Formula Sheet
Page 3 of 4
14. KILL MUD DENSITY (kg/m3)
SIDPP kPa TVD m 0.00981 Original Mud Density kg/m or
SIDPP TVD P Original Mud Density kg/m
.
15. INITIAL CIRCULATING PRESSURE (kPa)
Kill Rate Circulating Pressure kPa SIDPP kPa 16. FINAL CIRCULATING PRESSURE (kPa)
K M
O
D
M
/
D
Kill Rate Circulating Pressure kPa /
17. BARYTE REQUIRED TO INCREASE DRILLING MUD DENSITY (kg/ m3)
K M
D
/
O
M
K M
D
D
/
/
18. GAS MIGRATION RATE (m/hr)
R
I
S
D
M
D
P
/
.
P /
19. GAS LAWS
P
P1 x V1 = P2 x V2
P V
V
V
P V
P
20. PRESSURE DROP PER METRE TRIPPING DRY PIPE (kPa/m)
D
M
R
D
C
/
.
C
M
/
M
D
D
/
/
21. PRESSURE DROP PER METRE TRIPPING WET PIPE (kPa/m)
D
M
R
D
C
/
.
C
C
/
C
E
E
D
D
/
/
22. LEVEL DROP PULLING REMAINING COLLARS OUT OF HOLE DRY (metre)
L
C
R
M
C
D
C
/
/
23. LEVEL DROP PULLING REMAINING COLLARS OUT OF HOLE WET (metre)
L
C
R
C
C
E
D
C
/
/
24. LENGTH OF TUBULARS TO PULL DRY BEFORE OVERBALANCE IS LOST (metre)
O
D
P R
M
G
C
C
P /
M
/
M
D
International Well Control Forum
Inchbraoch House, South Quay Montrose, Angus DD10 9UA Scotland.
D
/
/
Tel: +44 1674 678120 Fax: +44 1674 678125
QA-RD7D
Rev No.5
July 2009
ISO: 9001/2008
S.I. Unit Formula Sheet
Page 4 of 4
25. LENGTH OF TUBULARS TO PULL WET BEFORE OVERBALANCE IS LOST (metre)
O
P R
D
M
C
C
G
P /
/
C
C
E
E
D
D
/
/
26. VOLUME TO BLEED OFF TO RESTORE BHP TO FORMATION PRESSURE (m )
I
S
F
P
P
P I f
P I
V
S
P
P
27. SLUG VOLUME (m ) FOR A GIVEN LENGTH OF DRY PIPE
L
D
P
S
P
D
C
/
/
D
D
M
M
D
D
/
/
28. PIT GAIN DUE TO SLUG U-TUBING (m )
Slug Volume m
S
D
D
F
D
/
1
/
29. RISER MARGIN (kg/m3)
Air Gap m
Water Depth m Mud Density kg/m
TVD m
Air Gap m
Water Depth m
Water Depth m
Sea Water Density kg/m 30. HYDROSTATIC PRESSURE LOSS IF CASING FLOAT FAILS (kPa)
M
D
/
.
C
C
C
C
/
A
/
U f
C
C
H
/
International Well Control Forum
Inchbraoch House
South Quay
Montrose
Angus DD10 9UA, Scotland,
Tel: 44-1674-678120
Fax: 44-1674-678125
Email: admin@iwcf.org
Internet site URL; http://www.iwcf.org
Chief Executive Officer;
David Price
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International Well Control Forum
Inchbraoch House, South Quay Montrose, Angus DD10 9UA Scotland.
Tel: +44 1674 678120 Fax: +44 1674 678125