Tranche 6 Jetting Operations - My-Spread Atlantic Jetting Tranche 6.pdf · Presentation For The...

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


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


Open Water Operations

Jet 36” / Drill Ahead Run & Cement 20” Run BOP Stack


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


Conductor: 195’ x 36” x 1½” X56 D90

Mobil 213/23-1 ~ July 1998

Rig: RB Falcon Jack Bates


Conductor: 195’ x 36” x 1½” X56 D90


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


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.


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.


214/17-1 Jetting Summary

28” STC MDGHODc w/ 4 x 18’s


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)



9 ½” NMDC

9 ½” NMDC


Dril Quip CADA Tool

9 ½” x 15’ PC

8” DC’s (6 Total)

Float Sub




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


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


213/23-1 Jetting Summary


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



9 ½” NMDC

9 ½” NMDC


Dril Quip CADA Tool

9 ½” x 15’ PC


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




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




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


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


27” Non-mag Sleeve & Mandrel Stabiliser

9 ½” NMDC

9 ½” NMDC


Dril Quip CADA Tool

9 ½” x 15’ PC


9 ½” x 8’ PC

Dril-Quip GGB with 0 - 2° and 0 - 5°

Slope Indicators



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.


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


MWD-GR

28” Welded

Blade Stabiliser

9 ½” NMDC

9 ½” NMDC


Dril Quip

CADA Tool

9 ½” x 15’ PC


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


F2000S w/ 28” Stab

Sleeve

LANDING

SHOULDER


MWD-GR

28” Welded

Blade Stabiliser

9 ½” NMDC

9 ½” NMDC


Dril Quip

CADA Tool

9 ½” x 15’ PC


9 ½” x 8’ PC

Dril-Quip GGB

28” STC MDGHODc


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


MWD-GR

27” Non-mag Sleeve &

Mandrel Stabiliser

9 ½” NMDC

9 ½” NMDC


Dril Quip

CADA Tool

9 ½” x 15’ PC


9 ½” x 8’ PC

Dril-Quip GGB

28” STC MDGHODc


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

Tranche 6 Jetting Operations - My-Spread Atlantic Jetting Tranche 6.pdf · Presentation For The...

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