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DEA(E) Paris 10 Dec 98.ppt
Vic EstesMobil North Sea Limited
Presentation For The
Drilling Engineering Association (Europe)Paris, France
Tranche 6
Jetting OperationsWest of Shetland
DEA(E) Paris 10 Dec 98.ppt
High Current Drilling Basins
000
200
400
600
800
1000
1200
1400
1600
1800
Ws Ws Ws Ws Ws Ws Ws
UK Atlantic FrontierTranche 6 (Mobil)
UK Atlantic FrontierTranche 61 (Mobil)
UK Atlantic Frontier
Foinaven (BP)
Norwegian Continental
Slope
Helland-Hansen
Vring Plateau
Gjallar Ridge (Saga)
Northern North Sea
Troll
Norwegian Continental
Shelf
Draugen
CS - Surface current
CB - Seabed current
WS - Wind speed (1 hour)
HS - Significant wave ht
TS - Max sea surface temp
TB - Min sea bottom temp
40 m/s 41 m/s 40 m/s 38 m/s 41 m/s 40 m/s 40 m/s
HG = 16.0 m HG = 15.0 m HG = 18.0 m HG = 17.0 m HG = 17.5 m HG = 18.0 m HG = 18.0 m
CS =
0.9 m/s
CS =
2.5 m/s
CS =
2.0 m/s
CS =
1.7 m/s
CS =
1.4 m/s
CS =
1.0 m/s
CS =
1.0 m/s
CB =
0.9 m/sCB =
0.6 m/s
CB =
1.2 m/sCB =
1.0 m/s
CB =
0.5 m/s
CB =
0.6 m/s
CB =
0.5 m/s
TS =
18.0 ºC TS =
16.5 ºC
TS =
18.8 ºC
TS =
16.2 ºC
TS =
15.0 ºC
TS =
12.0 ºC
TS =
12.0 ºC
TB =
6.0 ºCTB =
6.0 ºC
TB =
-1.5 ºC
TB =
-1.0 ºC
TB =
-1.0 ºC TB =
-1.0 ºC
TB =
-1.0 ºC
Wate
r D
epth
, m
eter
s
DEA(E) Paris 10 Dec 98.ppt
Open Water Operations
Jet 36” / Drill Ahead Run & Cement 20” Run BOP Stack
DEA(E) Paris 10 Dec 98.ppt
Previous Jetting in Area
1 2 3 4
6 7 8 9
1
3a
4 5
7 8
9a
10
1 2 3 4
6 7 8 9 10
11 12 13 14 15
17 18
19 20
21 22 24 25
26 27 28 29 30
18 19 20
23 24 25
28 29
213
Tranche 6
6
Tranche 8
16
5
10
5
23
30
Tranche 7
2
9b
3b
BG
214
CLAIR
0 20Km
Tranche 61 Tranche 60
205 206Esso 214/28-1 ~ April 1984Rig: Sedco 472
Water Depth: 2,142’ MSL
Conductor: 116’ x 30” x 1½” A36 ‘ALT’
Mobil 214/17-1 ~ April 1998
Rig: RB Falcon Jack Bates
Water Depth: 3,832’ MSL
Conductor: 195’ x 36” x 1½” X56 D90
Mobil 213/23-1 ~ July 1998
Rig: RB Falcon Jack Bates
Water Depth: 3,985’ MSL
Conductor: 195’ x 36” x 1½” X56 D90
DEA(E) Paris 10 Dec 98.ppt
Esso 214/28-1 Jetting Summary
26” HTC OSC 3AJ w/ 3 x 20’s
(bit spaced 11” inside 30” shoe)
3 J
oin
ts 3
0”
x 1
½” W
all
A3
6 A
LT
Sii 12” DynaDrill Delta 500
Slick Motor
LANDING
SHOULDER
26” Welded Blade Stabiliser
9” Drill Collar
9” Drill Collar
Vetco Double ‘J’ Drill Ahead
Tool
Float Sub
Competent Soil 13’ BML
Footage Jetted 116’
Average ROP 94.4 FPH
Wellhead Height 7’ AML*
Current Speed N/A
Final Deviation <½°
Soak Time Unknown
* Couldn’t un-jay after 1st jetting
attempt. GRA subsided ±14 while
cementing the 20” casing in place.
Vetco GRA with TGB
9” Drill Collar
Crossover
0
20
40
60
80
100
120
0 100 200 300
ROP, Feet / Hour
Pen
etra
tio
n D
epth
, F
eet
1st
2nd
0 20 40 60 80
Weight on Bit, kips
1st Attempt
2nd Attempt
0 500 1000 1500
Pump Output, gpm
1st
2nd
DEA(E) Paris 10 Dec 98.ppt
Conductor Analysis - 30” versus 36”
30” 1 ½” X65 36” 1 ½” X56
Conductor Penetration By Own Weight, feet 46 44
Maximum Moment, kip-in 60,460 60,050
Location of Maximum Moment, feet BML 26 26
Maximum Stress, ksi 66 45
Conductor Lateral Deflection at Mudline, in 34 20
Ultimate Vertical Capacity of Conductor, kips 452 542
Assumes 160 feet of conductor jetted into intermediate strength soil.
Intermediate soil is defined as normally consolidated clay with linearly
increasing shear strength with depth at a rate of 10 psi/ft. This is the soil
strength recommended by Fugro-McClelland in their 1993 Geological
Appraisal Report of Tranche 6.
DEA(E) Paris 10 Dec 98.ppt
214/17-1 Jettability Test
28” STC MDGHODc w/ 4 x 18’s Bit Sub
Halliburton 9 5/8” HDL1-L MWD-GR
9 ½” Non-mag Drill Collar
9 ½” Non-mag Drill Collar
9 ½” Drilling Jars
9 ½” Drill Collar
Crossover4 - 8” DC’s, XO, 9 - 5” HWDP Objectives
– Determine if any boulders or course gravel arepresent that might prevent the jetting of the 36”casing string.
– Confirm that mudline conditions are the same asused in conductor analysis, i.e. firm enough toprovide proper support & stability tocasing/wellhead/BOP’s.
Procedure
– Position rig ±100 feet down-current fromproposed location.
– TIH with 28” bit on rotary assembly. Establishcompetent bottom with 5000 lbs WOB.
– Jet ahead with minimum GPM, slowly rotate asrequired. Increase pump rate as required to 1200GPM. Stop at ±250 feet penetration.
– If objectives are not met, move rig 50 feet towardslocation and repeat. If objectives are still not met,move over location and drill/set 36” casingconventionally.
DEA(E) Paris 10 Dec 98.ppt
214/17-1 Jetting Summary
28” STC MDGHODc w/ 4 x 18’s
(bit spaced 7” inside 36” shoe)
Jet Sub w/ 3 x 16’s
5 J
oin
ts 3
6”
x 1
½” W
all
X56
DQ
D9
0M
THalliburton 9 5/8” D200 Slick Motor
(no nozzle or dump valve)
Halliburton 9 5/8” HDL1-L MWD-GR
28” Welded Blade Stabiliser
9 ½” NMDC
9 ½” NMDC
9 ½” Drilling Jars
Dril Quip CADA Tool
9 ½” x 15’ PC
8” DC’s (6 Total)
Float Sub
Competent Soil 10’ BML
Footage Jetted 195’
Average ROP 52.3 FPH
Wellhead Height 6’ AML
Current Speed 0 - ¼ kts
Final Deviation 0°, ¼°, 1.1° MWD
Soak Time 4 hours
Weight of 36”/20” 259 kips
Vertical Capacity 490 kips (Design)
Final Status Stable
Dril-Quip GGB with 0 - 2° and
0 - 5° Slope Indicators
28” Welded Blade Stabiliser
LANDING
SHOULDER
0
50
100
150
200
250
0 100 200 300
ROP, Feet / Hour
Pen
etra
tio
n D
epth
, F
eet
Test
Jet
0 25 50 75 100
Weight on Bit, kips
TestRPMJet
0 500 1000 1500
Pump Output, gpm
Test
Jet
DEA(E) Paris 10 Dec 98.ppt
213/23-1 Jetting Summary
28” Welded Blade Stabiliser
5 J
oin
ts 3
6”
x 1
½” W
all
X56
DQ
D9
0M
THalliburton 9 5/8” F2000S w/ 28” Stab
Sleeve (no nozzle or dump valve)
LANDING
SHOULDER
Halliburton 9 5/8” HDL1-L MWD-GR
28” Welded Blade Stabiliser
9 ½” NMDC
9 ½” NMDC
9 ½” Drilling Jars
Dril Quip CADA Tool
9 ½” x 15’ PC
8” DC’s (6 Total)
9 ½” x 8’ PC0
20
40
60
80
100
120
140
160
180
200
0 50 100 150 200
ROP, Feet / Hour
Pen
etra
tio
n D
epth
, F
eet
0 50 100 150
Weight on Bit, kips
0 500 1000 1500
Pump Output, gpm
Competent Soil 17’ BML
Footage Jetted 195’
Average ROP 53.2 FPH
Wellhead Height 6’ AML
Current Speed ½ - ¾ kts
Final Deviation ¾°, 1°, 0.6° MWD
Soak Time 6 hours
Weight of 36”/20” 259 kips
Vertical Capacity 542 kips (Design)
Final Status Stable
Dril-Quip GGB with 0 - 2° and
0 - 5° Slope Indicators
28” STC MDGHODc w/ 4 x 18’s
(bit spaced 9” inside 36” shoe)
DEA(E) Paris 10 Dec 98.ppt
Overall Comparison
0
50
100
150
200
0 100 200 300
ROP, Feet / Hour
Pen
etra
tio
n D
epth
, F
eet
214/28-1
214/17-1
213/23-1
0 25 50 75 100 125
Weight on Bit, kips
214/28-1
214/17-1
213/23-1
0 500 1,000 1,500
Pump Output, gpm
214/28-1
214/17-1
213/23-1
DEA(E) Paris 10 Dec 98.ppt
214/4-1 Optimisation
27 ½” Non-mag Sleeve & Mandrel Stabiliser5
Jo
ints
36”
x 1
½” W
all
X56
DQ
D9
0M
T
Halliburton 9 5/8” F2000S w/ 1° fixed bend
(no dump valve; nozzled for 1300 gpm)
LANDING
SHOULDER
Halliburton 9 5/8” HDL1-L MWD-GR
27” Non-mag Sleeve & Mandrel Stabiliser
9 ½” NMDC
9 ½” NMDC
9 ½” Drilling Jars
Dril Quip CADA Tool
9 ½” x 15’ PC
8” DC’s (6 Total)
9 ½” x 8’ PC
Dril-Quip GGB with 0 - 2° and 0 - 5°
Slope Indicators
28” STC MDGHODc w/ 4 x 24’s
(bit spaced 5” inside 36” shoe)
Hydraulics to be optimised for 1,300 gpm rather than 1,200 gpm.
Halliburton 9 5/8” F2000S motor to be configured with 1°fixed bend and 27 3/4” bearing housing stabiliser. Expect negligible effect on jetting operation but will aid in deviation control of 28” interval.
Bit moved closer to conductor shoe to aid in jetting ROP.
DEA(E) Paris 10 Dec 98.ppt
WoB Learning Curve3 J
oin
ts 3
0” x
1 ½
” W
all
A36 A
LT
LANDING
SHOULDER
Vetco Double ‘J’
Drill Ahead Tool
Vetco GRA
with TGB
26” HTC OSC 3AJ
(bit spaced 11”
inside 30” shoe)
Sii 12” Slick Motor
26” Welded
Blade Stabiliser
9” Drill Collar
9” Drill Collar
Float Sub
9” Drill Collar
Crossover
28” STC MDGHODc
(bit spaced 7” inside
36” shoe)
Jet Sub
5 J
oin
ts 3
6”
x 1
½”
Wa
ll X
56
DQ
D90
MT
Halliburton 9 5/8”
Slick Motor
LANDING
SHOULDER
Halliburton 9 5/8”
MWD-GR
28” Welded
Blade Stabiliser
9 ½” NMDC
9 ½” NMDC
9 ½” Drilling Jars
Dril Quip
CADA Tool
9 ½” x 15’ PC
8” DC’s (6 Total)
Float Sub
Dril-Quip GGB
28” Welded
Blade Stabiliser
28” Welded
Blade Stabiliser
5 J
oin
ts 3
6”
x 1
½”
Wa
ll X
56
DQ
D90
MT
Halliburton 9 5/8”
F2000S w/ 28” Stab
Sleeve
LANDING
SHOULDER
Halliburton 9 5/8”
MWD-GR
28” Welded
Blade Stabiliser
9 ½” NMDC
9 ½” NMDC
9 ½” Drilling Jars
Dril Quip
CADA Tool
9 ½” x 15’ PC
8” DC’s (6 Total)
9 ½” x 8’ PC
Dril-Quip GGB
28” STC MDGHODc
(bit spaced 9” inside
36” shoe)
27 ½” Non-mag Sleeve &
Mandrel Stabiliser
5 J
oin
ts 3
6”
x 1
½”
Wa
ll X
56
DQ
D90
MT
Halliburton 9 5/8” F2000S w/ 1°
fixed bend
LANDING
SHOULDER
Halliburton 9 5/8”
MWD-GR
27” Non-mag Sleeve &
Mandrel Stabiliser
9 ½” NMDC
9 ½” NMDC
9 ½” Drilling Jars
Dril Quip
CADA Tool
9 ½” x 15’ PC
8” DC’s (6 Total)
9 ½” x 8’ PC
Dril-Quip GGB
28” STC MDGHODc
(bit spaced 5” inside
36” shoe)
Esso 214/28-1April 1984
Mobil 214/17-1
April 1998
Mobil 213/23-1
July 1998
Mobil 214/4-1
April 1999