Casing Drilling Casing Drilling - - Recent Advances for Drilling Challenges Recent Advances for Drilling Challenges SPE Gulf Coast Section SPE Gulf Coast Section January 10, 2001 January 10, 2001 Allen Sinor Allen Sinor Hughes Christensen Hughes Christensen- A Baker Hughes Company A Baker Hughes Company The Woodlands, Texas The Woodlands, Texas
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Casing DrillingCasing Drilling--Recent Advances for Drilling ChallengesRecent Advances for Drilling Challenges
Allen Sinor Allen Sinor Hughes ChristensenHughes Christensen-- A Baker Hughes CompanyA Baker Hughes Company
The Woodlands, TexasThe Woodlands, Texas
Casing Drilling Isn’t New…..Casing Drilling Isn’t New…..•• Mid 20’sMid 20’s-- Retractable Bits in Poland/France (Retractable Bits in Poland/France (GelfgatGelfgat))•• Mid 70’sMid 70’s-- Retractable Bits in Siberia (Retractable Bits in Siberia (GelfgatGelfgat))•• Early 80’sEarly 80’s-- California Heavy Oil Sands California Heavy Oil Sands •• Mid 80’sMid 80’s-- West Texas West Texas InfillInfill Drilling (Weaver)Drilling (Weaver)•• Late 80’sLate 80’s-- High Speed Coring/Drilling (High Speed Coring/Drilling (MillheimMillheim))•• 90’s90’s
•• Getting Casing / Liner to Total DepthGetting Casing / Liner to Total Depth
•• Running Casing / Liner into Depleted Running Casing / Liner into Depleted
Pay with Weak Matrix StrengthPay with Weak Matrix Strength
•• Minimizing Flat TimeMinimizing Flat Time
•• Extending the Length of Open Extending the Length of Open WellboresWellbores
•• Mitigating Shallow Gas / Water HazardsMitigating Shallow Gas / Water Hazards
•• Rubble Zones Above / Below Salt DomesRubble Zones Above / Below Salt Domes
Getting Casing / Liner to Total DepthGetting Casing / Liner to Total Depth
Bestline Bestline Liner SystemsLiner Systems
Liner Drilling in Heavy Oil ApplicationLiner Drilling in Heavy Oil Application
Evolutionary Process……• Bridges While TIH With Liner• Drilling Liner to Remove Obstacles• Drilling Liner Underbalanced• Drilling Liner and Gravel Packing
Successes• 2000 Liner Drilling Completions Since 1981• 260+ in 1998, 100+ in 2000• Three Sizes
•8-1/2” bit (or 7”x15” UR) with 7” liner for 9-5/8” casing•7-7/8” bit (or 7”x15” UR) with 6-5/8” liner for 8-5/8” casing•Same for 5-1/2” liner for 8-5/8” casing•6-1/8” bit (or 6”x13” UR) with 5-1/2” liner for 7” casing
• Texaco, Chevron, Aera Energy LLC + independents• INCREASED PRODUCTION
DRILL PIPE
BOP
DRILL IN NIPPLE
UNDERREAMER
CASING
CASING SHOE
BIT
PILOT HOLE
ROTATING HEAD
DIRECTION OF CIRCULATION
LINER
DIVERTER LINE
Procedure• Run Liner to Casing Shoe• Establish Foam Rate and Pressure• Establish Shoulder for Underreaming• Begin Foam Drilling• Take Returns Through Diverter Line
ONE STEP Completion System• Drill and Underream Liner• Gravel Pack Liner• Release Liner• All Steps Completed in One Trip
DRILL PIPE
BOP
SLOTTED LINER
UNDEREAMER
CASING
CASING SHOE
BIT
GRAVEL PACK VALVE
DIVERTER LINE
DIRECTION OF CIRCULATION
CASINGVALVE
ROTATING HEAD
• At TD, Circulate Foam Until Clean• Switch Returns to Casing Valve• Close Hydril • Drop Ball Down Drillpipe, Opening
Gravel Pack Valve Inside Liner• Foam Down Drillpipe, Out Through
Liner Slots and Casing Valve
ROTATING HEAD
DRILL PIPE
BOP
SLOTTED LINER
UNDERREAMER
CASING
BIT
GRAVEL PACK VALVE
CASING SHOE
DIVERTER LINE
DIRECTION OF CIRCULATION
CASINGVALVE
Begin Gravel Packing• Reverse Foam Down Casing, Liner
Slots and Gravel Pack Valve• Begin Adding Gravel to Foam • Continue at Slow Rate Until Liner Has
Packed Off• Bleed Off Pressure, Drop Release Ball• Circulate to Remove Sand from Liner
Top• Pull Tools and Tailpipe Out of the Hole
Running Casing / Liner into Depleted Pay Running Casing / Liner into Depleted Pay
with Weak Matrix Strengthwith Weak Matrix Strength
Baker Hughes Inc.Baker Hughes Inc.
North Sea- Valhall• 10 Wells Drilled Rotating the Liner• 7 Wells Drilled with a Drill-in Liner• Liner Sizes of 5”, 7”, 7-5/8” and 9-5/8”• Liner Lengths up to 4,472’ / Inclination up to 67°• Successful Drilling into Severely Depleted Pay (∆ 7 ppge• Significant Well Cost Savings (~$2MM/well)
Offshore Indonesia- Arun Field• 9 Wells Drilled with a Drill-in Liner• Liner Sizes of 7” and 9-5/8”• Liner Lengths up to 6,872’ / Inclination up to 67°
Liner Drilling SuccessesLiner Drilling Successes
North SeaNorth Sea-- ValhallValhall Field (BP Amoco)Field (BP Amoco)
Valhall Field
Depleted Oil Reservoir
• Lista Top Formation 14.7 ppg, Tor Payzone 7,0 ppg• Top of Reservoir ca. 2400 - 2500 m• Sea Level ca. 200 m
9 5/8” Liner• Used for New Drills
7” and 7 5/8” Liner• Used for Reentry (Sidetrack) Wells
• Sidetrack off Whipstock• Directionally Drill Section
Mobil Indonesia / North SumatraMobil Indonesia / North Sumatra-- Arun Arun FieldField
Depleted Gas Reservoir• Top of Reservoir ca. 2900 - 3200 m• Shale 14,7 ppg, Limestone 2.5 ppg
7” Tools: Reentry Application• Section Milling• Whipstock• Perforate & Squeeze or no Cementing
Results:Results:•• Drilled 15.6m in 3.2 hours, 4.9 m/hrDrilled 15.6m in 3.2 hours, 4.9 m/hr•• Drilled 7.6m of depleted TORDrilled 7.6m of depleted TOR•• Total losses of 14.6Total losses of 14.6 ppgppg mud was 1,350mud was 1,350 bblsbbls•• Annulus kept full with 69Annulus kept full with 69 bblsbbls of 6.8of 6.8 ppgppg base oilbase oil•• Mill drilled landing/float collar, shoe in 65 min.Mill drilled landing/float collar, shoe in 65 min.•• Reduced rig time from 33.8 days to 15.6 daysReduced rig time from 33.8 days to 15.6 days•• Estimated savings of $1.82MM ($100k/day)Estimated savings of $1.82MM ($100k/day)
Liner Shoe ImprovementsLiner Shoe Improvements
Well 2/8Well 2/8--AA--3B3BWell 2/8Well 2/8--AA--2A2A
• Anti-whirl features• Four blades• Shorter PDC cutters (cone)• Lower cone angle• Thicker base plate
* Bit and underreamer, inner string motor and casing spear** Drilled in three attempts due to casing failure at window
Changed from 3.6° exit angle to 2.1° on whipstock
# Date Customer Field Liner Liner Measured Depth Drilling Incl. DLS Remark finalLocation Well length OD / ID weight in out Distance Time Result
1 Jun.1995 Mobil Arun 493 m 7" 35 ppf 3240 m 3264 m 24 m 9 hrs 56° 7°/30 m No hanger used Successful
Indonesia C-I-16 1616 ft 5.879" 10626 ft 10707 ft 80 ft 7°/100 ft Releasing tool problems
2 Sep.1995 Mobil Arun 912 m 7" 35 ppf 3212 m 3236 m 25 m 16 hrs 53° 8°/30 m Problems start drilling Successful
Indonesia C-II-8B 2992 ft 5.879" 10534 ft 10615 ft 81 ft 8° / 100 ft Releasing tool problems
3 Dec.1995 Mobil Arun 1024 m 7" 35 ppf 3402 m 3462 m 60 m 33 hrs 51° 8°/30 m Releasing tool problems Successful
Indonesia C-I-12 3360 ft 5.879" 11157 ft 11355 ft 198 ft 8°/100 ft
4 Oct.1997 Mobil Arun 915 m 7" 35 ppf 3049 m 3062 m 12.8 m 9 hrs 38° 2°/30 m Meptec & BOT involved Successful
Indonesia C-II-6 3000 ft 5.879" 10000 ft 10042 ft 42 ft 2°/100 ft No problems
5 Nov.1997 Amoco Valhall 2080 m 9 5/8" 53.4 ppf 3551 m 3570 m 19 m 1.5 hrs 67° 2°/30 m Only sliding Mode SuccessfulNorway 2/8-F17 6822 ft 8.5" 11646 ft 11709 ft 62 ft 2°/100 ft No problems
6 Dec.1997 Mobil Arun 808 m 7" 35 ppf 3264 m 3265 m 0.76 m 1.5 hrs 43° 2°/30 m No problems Successful
Indonesia C-IV-9 2650 ft 5.879" 10705 ft 10707.5 ft 2.5 ft 2°/100 ft
7 Jan.1998 Amoco Valhall 1445 m 9 5/8" 53.4 ppf 2652 m 2669 m 17 m 3 hrs 63° n/a Only sliding mode Successful
Norway 2/8-F11 4674 ft 8.5" 8698 ft 8756 ft 56 ft n/a No problems
8 Jan.1998 Mobil Arun 806 m 7" 35 ppf 3021 m 3027 m 5.8 m 15.5 hrs 36° 3.3°/30 m Differential - Successful
Indonesia C-II-3B 2642 ft 5.879" 9908 ft 9927 ft 19 ft 3.3°/100 ft Sticking problems
9 Feb.1998 Amoco Valhall 1600 m 7 5/8" 39 ppf 4295 m 4302 m 7 m 3 hrs. 60° 1.5°/30 m Only sliding Mode, stalling Successful
Norway 2/8-A-19A 5277 ft 6.5" 14087 ft 14110 ft 23 ft 1.5°/100 ft problems, Nodeco Hanger
10 Mar.1998 Mobil Arun 837 m 7" 35 ppf 3192 3202 m 10.4 m n/a 39° n/a got stuck on the first trial, Succesful
Indonesia C-1-8 2747 ft 5.879" 10469 ft 10503 ft 34 ft n/a fishing required, roller reamer
11 May.1998 Amoco Valhall 1352 m 9 5/8" 53,4 ppf 2563 m 2575 12 m 2 hrs. 3° 2.5°/100 ft slow drilling Succesful
Norway 2/8-F14 4434 ft 8,5" 8406 ft 8445 ft 39 ft 2.5°/30 m DL set 10 m into reservoir
12 July.1998 Amoco Valhall # 7 5/8" 39 ppf # # # # # # Tool failed at the rig site due abandoned
13 Oct. 98 Mobil Arun 655 m 7" 35 ppf 3529 m 3556 m 27,4 m 37,8 hrs 63° 2,9°/100 ft no problems, first MOI DL Successful
Indonesia C-II-21 2148 ft 5.879" 11574 ft 11664 ft 90 ft 2.9°/30 m Whipstock Sidetrack
14 Nov-98 Mobil Arun 758 m 7" 35 ppf 3296 m 3325 m 29 m 6 hrs. 38° n/a not stuck, finiched drilling Succesful
Indonesia C-IV-4 ST 2487 ft 5,879" 10810 ft 10905 ft 95 ft when set 61 ft into reservoir
DrillDrill--in Liner Wellsin Liner Wells
Minimizing Flat Time Minimizing Flat Time
Improving Drilling Efficiency with Casing DrillingImproving Drilling Efficiency with Casing Drilling
Tesco Tesco CorporationCorporation
Casing Drilling Successes• Two Horizontal Test Wells• 18 Commercial Wells Drilled
• 16 Land• Two Offshore
• Directional up to Horizontal (7” casing) • Casing Sizes Drilled
• 4-1/2” • 7”• 9-5/8”
Casing Used for Drillstring
Uniform, Reduced Volume Annulus
Retrievable Bottom Hole Assembly- Drill lock assembly- Directional tools, if needed - Under reamer or drilling shoe- Pilot Bit
Operation:- Casing rotated- No drill string tripping - Almost continuous circulation- Casing on bottom at all times
Casing Clamp
Extend
Clamp(9-5/8” - 3-1/2”)
Four Wells• 800 ft Surface Holes• Drilled 12-1/4” Hole• Cemented 9-5/8” Casing
0
10
20
30
40
50
60
70
BestOffset
1st 2nd 3rd 4th
Hou
rs fr
om s
pud
to p
lug
dow
n
Wyoming
PDCRollercone
05
1015202530
Average
Offse
ts
First W
ell
Secon
d Well
Third W
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Fourth
Well
Fifth W
ell
Tim
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ours
Total timeDrilling time
Wyoming- Wamsutter FieldFive Surface Holes Drilled to 1200’ (7” Casing)
Two 12-1/4” Holes Drilled with 9-5/8” Casing Depths of 3200 & 3800 ft
A - 14 A - 13A - 12
100
80
60
40
20
0
75.5 hrs
94.0 hrs
59.5 hrs
Ela
psed
Tim
e (S
pud
to T
D),
Hrs
Target
Con
vent
iona
l
Fir
st C
asin
g D
rille
d
Seco
nd C
asin
g D
rille
d
75.5 hrs
Offshore Gulf of Mexico
January 2001• Surface Hole
– 8-1/2” hole drilled with 7” casing to 1200 ft– Tesco Underreamer and Hughes PDC pilot bit– Retrieve BHA & cemented (no plug)– 8 hr drilling time - 12.5 hr total time
• Production hole– 6-1/4” hole drilled with 4-1/2” casing to 9,436 ft– BHA retrieved in good shape after 236 drilling hrs– Pay zone drilled underbalanced– Retrieved BHA with wireline & pumped cement float– Successful cement job including float holding pressure
Deepest Casing Drilled Well
Additional Activities…..Additional Activities…..
BETA• Drilled 500’ w/10-3/4” casing & 12-1/4” Rollercone• Rotary Speeds Up to 300 rpm
Gulf of Mexico• Extending the Reach
– ~30 Disposable Motor Runs Past Two Years– 5-7/8” & 6-1/4” Bits / 7-5/8” Casing / 4-3/4” Motors
• ~8 Large Diameter Casing Strings Drilled– 10” & 18-5/8” Casing– Water Depths of 300’ - 800’