CT Drilling

Coiled Tubing Drilling

© 2002 Weatherford International, Inc. All Rights Reserved

Methology

• Drill well to producing sands with conventional drilling rig • Build curve and run liner • Run completion tubing (Monobore) • Move rig off location • Rig up Coiled Tubing, Pumps, Nitrogen Units and Separators for Underbalanced Drilling • Drill horizontal section • Rig down equipment and test well

© 2002 Weatherford International, Inc. All Rights Reserved

Advantages of Drilling Horizontal Section in Underbalanced Mode • • • • •

Drastically reduce formation damage Eliminate differential sticking Produce well while drilling Increment in rate of penetration Well is under control at all times

© 2002 Weatherford International, Inc. All Rights Reserved

Disadvantages of Drilling in Underbalanced Mode • • • • •

Increase in cost of equipment Instability of formation during drilling Use of Electromagnetic tools Well Control Corrosion

© 2002 Weatherford International, Inc. All Rights Reserved

Advantages for drilling with Coiled Tubing • Lower cost and HSE risk • Steady State system since there is continous flow and no stopping of pumps to make connections minimizing stuck pipe exposure • Minizes trip times • Minor environmental impact (small location, close ciruit) • Reliable and fast data transmission to surface with Electric Line tools.

© 2002 Weatherford International, Inc. All Rights Reserved

Prototype Well Diagram Section Drilled with Conventional Drilling SSSV – 1000’ ID=4.52” (5 ½” nominal) 9-5/8”

Section Drilled with Underbalance CT

Monobore Completion 4-1/2” Tbg ID=3.92”

7” 4-1/2” Liner ID=3.92”

Eq. Dens fluid: 5,03 ppg Fluid Base: Oil Gaseous Base: Nitrogen Hueco de 3 3/4”

Production Sands c

TD = 11,000’ MD Open Hole completion

Bottom Temp = 290 °F

TVD = 9,200’ Shoe 10,200’ MD © 2002 Weatherford International, Inc. All Rights Reserved

800’

Gas Well Bottom Pressure = 2,543 Psi Permeability = 40 – 180 MD

33’

Surface Equipment

4 PHASE SEPARTOR

GAS MEASUREMENT

BOOSTERS UBD CHOKE MANIFOLD

NITROGEN MEMBRANE

OIL / WATER PROCESSING FACILITIES

DRILL CUTTINGS PROCESSING WATER & OIL MEASUREMENT COMPRESSORS

DRILL CUTTINGS DISPOSAL RETURN MUD to PITS DATA RECORDING POINTS

© 2002 Weatherford International, Inc. All Rights Reserved

On Location Nitrogen Generating System

© 2002 Weatherford International, Inc. All Rights Reserved

Underbalance Operations Equipment Primary Compressors Quincy, type QSS 850200, 850 pcm at 200 lppc.

© 2002 Weatherford International, Inc. All Rights Reserved

Underbalance Operations Equipment Nitrogen Generating Unit WolfPack • Cost effective solution • On site nitrogen generation capability • Suitable for land and offshore use • Small footprint – no need for cryo-tanks on location

© 2002 Weatherford International, Inc. All Rights Reserved

Underbalance Operations Equipment 4,000 psi Booster Booster Joy WB11 @ 4,000 PSI

© 2002 Weatherford International, Inc. All Rights Reserved

Underbalanced Operations Equipment • Four Phase separator permits the separation of drilling returns. Solids. Gases. Oil. Drilling Fluid or H2O.

© 2002 Weatherford International, Inc. All Rights Reserved

4 Phase Separator

Data Acquisition System •

System gathers all injection and production information in real time. – – – – –

Gas Injection. Fluid Injection. Gas Production. Gas & Crude Production. All Temperatures and pressures of equipment and flow to surface. – Volume of fluid in tanks.

•

Produces reports of losses and gains in real time.

© 2002 Weatherford International, Inc. All Rights Reserved

Coiled Tubing Equipment

• Injector Head SS-1100 Tension = 110 Klbs Inyec = 40 Klbs • Reel capabilities: 14.000’ of 2 3/8” tubing • BOP’s and Stripper ID = 4 1/16 ; 10 Mpsi WP Rams (Blind, Shear, slip, Annular) BOP,s Auxiliar • Data acquisition system: CTES – Orion Software

© 2002 Weatherford International, Inc. All Rights Reserved

Coiled Tubing Characteristics • • • • • • • • • •

OD = 2 3/8” ; ID = 2.063”; EP = .156” ; 13,500’ long Hydraulic Line: OD = .250” (ID = .18”) Diameter of 3 conductor Electric Line = 5 /16” Ly = 97,880 lbs Grade = HS – 90 ; 90,000 psi Overpull Resistant to high concentrations of H2S Working Pressure = 9,200 psi ; Collapsing Pressure = 9,000 psi Weight of tubing with capillary, E-line and Hyd lines = 4.0412 #/pie WOB available @ TD = 5,000 lbs Overpull available @ TD = 30,000 lbs

© 2002 Weatherford International, Inc. All Rights Reserved

Directional Drilling Tools

© 2002 Weatherford International, Inc. All Rights Reserved

Measuring and Orienting

Tubing 2” 3/8

• Weatherford 2 7/8” or 3 1/8” • Requires 2 3/8” OD Hibrid Coil with:

Hydraulic Lines

• Electric Line to send to surface real time drilling data (Inclination, azimuth, gamma ray, downhole pressure) • Two hydraulic lines to operate orienting tool and operate hydraulic release mechanism

Electric Line Capillary

© 2002 Weatherford International, Inc. All Rights Reserved

BHA Schematic

Downhole Motor w/ Bent Housing

PDC Bit 3 3/4”

© 2002 Weatherford International, Inc. All Rights Reserved

MWD (GR, Pressure, D&I)

Hydraulic Orienting Tool

Hydraulic Disconnect

CT 2 3/8” Hibrid (1 E-line & 2 Hyd lines)

CT Directional BHA Specifications CT Connector c/w DF Check Sub

Hydraulic Orienting Tool c/w Circulating Sub

Non-mag Collar c/w Directional Package and Gamma Ray

Quick Connect

Hydraulic Disconnect

Internal / External Pressure Sub

DF Check Sub

Positive Displacement Mud Motor c/w SABH

Total BHA Length ~13m 2 Stainless Steel Capillary Tubes for Orienting tool operation 1 Multi-conductor Wireline for Steering Tool / Gamma operation Supplier:

Bakke Oil Tools through Dalen Drilling Services BHA Size: 3-1/8” or 2-7/8” Electronics: Full Directional Suite (Russell Probe) and Gamma Ray & Pressure Wireline: 7/16” hepta cable rated for 175oC Capillaries: 1/4” or 3/8” stainless steel annular Features: Circulation Sub Orienter: 400 degree rotation, 1330 ft-lbs torque Hydraulic and Flow Activated Release Tools Upper and Lower Dual Flapper Check Valves Deployment Quick Connect

© 2002 Weatherford International, Inc. All Rights Reserved

Drill Bit

The CTD™ Motor

CTD™ Downhole Motor • Elevated WOB Loads – Load Sharing bearing assembly provides for elevated WOB and jarring capacity • Elevated Side Load Capabilities – High strength materials and CTD™ design allow for extended periods in high side load environments. • Elevated Overpull Loads – Balanced connections throughout the design provide for elevated safe overpull and jarring capacity • Sealed Bearings – Critical in UBD service • Maximum Torque Output – Power sections that minimize stalls

© 2002 Weatherford International, Inc. All Rights Reserved

CTD ™ Motor Issues/Contingencies CTD™ Downhole Motor • Power section designed and testing for high N2 and temperature applications. • Testing of mud/elastomer interaction can be conducted at Weatherford facilities in Houston

© 2002 Weatherford International, Inc. All Rights Reserved

Surface Equipment Worksite Trailer

Remote Display

Interface Box Driller’s Display © 2002 Weatherford International, Inc. All Rights Reserved

Publications/Experience

Experience in the drilling of 25 underbalanced wells with Coiled Tubing SPE 72373 - Underbalanced Coiled-Tubing Drilling in a Thin Gas Storage Reservoir: A Case Study SPE - Coiled Tubing Underbalanced Drilling from a Floating Production Vessel in the North Sea

© 2002 Weatherford International, Inc. All Rights Reserved

Case Histories Well

BP Courson

NAL09-29

PCP 10-12

3458

Buchan Alpha 9186

4668

Para Rainbow 836

Para Rainbow 721

TVD (ft)

4110

Hole Size (in)

4-3/4

3-1/2

4-3/4

4-3/4

3-7/8

3-7/8

Distance Drilled (ft)

374

1295

278

131

492

597

Hours in Hole

17

360

32

6

20

43

Annular Pressure (psi)

710

2103

1450

1624

188

188

Q Liq/Gas (gal/scft)

40/1059

147

66/882

198 l/min Crude

31/423

66/176

Formation

dolomite

Sandstone

Carbonate

Carbonate

Sand

Sand

ROP (ft/hr)

16

13 – 39

98

32

98

45

Max DLS (deg/100 ft)

35

35

29

15.5

15

11

H2S (%)

100

0

trace

90 ppm/CO2 INJ

200

200

Temperature (deg F)

89

185

167

130

Failures

See attached

1-pressure Sub

None

None

None

None

© 2002 Weatherford International, Inc. All Rights Reserved

Case Histories Well

49-1W5M

Penn 4621

Penn 4621st

77-18W4M

76-18W4M

76-18W4M

TVD (ft)

4895

2952

2952

1312

1312

1312

Hole Size (in)

3-7/8

4-3/4

4-3/4

3-7/8

3-7/8

3-7/8

Distance Drilled (ft)

196

278

836

229

547

777

Hours in Hole

61

44

111

60

42

29

Annular Pressure (psi)

870

435

652

217

188

217

Q Liq/Gas (gal/scft)

33/475

105/282

105/459

52/423

66/353

66/353

Formation

Glauconite

Sandstone

Sandstone

Nisku

Nisku

Nisku

ROP (f/hr)

26

19

23

13 - 49

13 - 65

13 – 65

Max DLS (deg/100 ft)

52

33

27

5

5

5

H2S (%)

0

0

0

0

0

0

Temperature (deg F)

140

90

90

75

75

75

Failures

1 - gamma

none

None

-collector

None

None

© 2002 Weatherford International, Inc. All Rights Reserved

Case Histories Well

Thunder 1534

Murphy C-66

TVD (ft)

3635

9186

Hole Size (in)

6-1/8

6-1/8

Distance Drilled (ft)

754

229

Hours in Hole

90

46

Annular Pressure (psi)

754

Q Liq/Gas (gal/scft)

192/494

Formation

Sand

ROP (ft/hr)

13

16

Max DLS (deg/100 ft)

15

1

H2S (%)

0

132/1306

Temperature (deg F) Failures

none

© 2002 Weatherford International, Inc. All Rights Reserved

none

Risk Assesment

Risk Coiled Tubing Getting Stuck

Controlling Factors Do not stop pumps Keep tubing moving If it is necessary to stop pumping, move CT to safe location Identify the stuck mode/location (Annular pressure, Orienter, Reactive torque) Use different fluids (viscous gel, nitrogen) Follow procedure for disconnecting BHA Have fishing tools on location Side Track in open hole

© 2002 Weatherford International, Inc. All Rights Reserved

Risk Assesment Risk Directional tools fail hole

Controlling Factors Excessive Vibrations: Changes in Parameters Weight on Bit Size of tool Type of Bit ( PDC, Diamond, Tri-cone) Change fluid mix (gas/liquid) and flow rates

Intgrity of BOP

Operational inspection and testing Spare parts

Test CT interal pressure

Pre-Operational Inspection

Depth Control

Operational procedure for depth correlation Depth correlation with shoe

BOP

Pre-operational planning Use of combination rams

Hole Cleaning

Planning with good annular velocity Inspection of cuttings and CT weight

© 2002 Weatherford International, Inc. All Rights Reserved

Future Projects

Well optimization (Drilling 9-5/8” from surface) Re-Entry of existing wells (80% of experience is in ReEntries) Larger Underbalanced hole with 4-1/8” OD BHA

© 2002 Weatherford International, Inc. All Rights Reserved

Re-Entries with TT Whipstock

© 2002 Weatherford International, Inc. All Rights Reserved

Multi-Laterales

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Pre-Milled Windows

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Thank You

© 2002 Weatherford International, Inc. All Rights Reserved