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7/30/2019 CT Drilling

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© 2002 Weatherford International, Inc. All Rights Reserved

Coiled Tubing Drilling




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•




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•




Disadvantages of Drilling in

Underbalanced Mode

Increase in cost of equipment•

Instability of formation during drilling•

Use of Electromagnetic tools•

Well Control•

Corrosion•




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.




c

Prototype Well Diagram

9-5/8”

7”

4-1/2” Tbg

ID=3.92”

4-1/2” Liner

ID=3.92”

SSSV – 1000’ ID=4.52”

(5 ½” nominal)

800’

33’

TD = 11,000’ MD

Hueco de 3 3/4”

Shoe 10,200’ MD

Open Hol e

completion Bottom Temp =

290 °F Gas Well

Bottom Pressure = 2,543 Psi

Permeability = 40 – 180 MDTVD = 9,200’

Eq. Dens fluid: 5,03 ppg

Fluid Base: Oil

Gaseous Base: Nitrogen

Production

Sands

Monobore

Completion

Section Drilled with

Conventional Drilling

Section Drilled with

Underbalance CT




Surface Equipment

BOOSTERS

NITROGEN

MEMBRANE

COMPRESSORS

WATER & OIL

MEASUREMENT

OIL / WATER

PROCESSING

FACILITIES

GAS

MEASUREMENT

DRILL CUTTINGS DISPOSAL

RETURN MUD to PITS

DRILL CUTTINGS PROCESSING

UBD

CHOKE

MANIFOLD

4 PHASE

SEPARTOR

DATA RECORDING POINTS




On Location Nitrogen Generating System




PrimaryCompressors

Quincy, type QSS 850-200, 850 pcm at 200lppc.

Underbalance OperationsEquipment




Nitrogen Generating Unit -WolfPack

Cost effective solution•On site nitrogen•generation capabilitySuitable for land and•offshore useSmall footprint – no•need for cryo-tanks onlocation





4,000 psiBooster

Booster JoyWB11 @ 4,000PSI





Four Phase separator •

permits the separation

of drilling returns.

Solids.

Gases.

Oil.

Drilling Fluid or H2O.

Underbalanced Operations Equipment

4 Phase Separator




Data Acquisition System

System gathers all injection and• production information in realtime.

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.




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




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•




Directional Drilling Tools




Measuring and Orienting

Weatherford 2 7/8” or 3 1/8”•

Requires 2 3/8” OD Hibrid Coil with:•

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 releasemechanism

Tubing 2” 3/8

Hydraulic

Lines

Electric Line

Capillary




BHA Schematic

CT 2 3/8” Hibrid

(1 E-line & 2 Hyd lines)Downhole Motor

w/ Bent Housing

PDC Bit

3 3/4”

Hydraulic

Orienting Tool

MWD (GR, Pressure, D&I) Hydraulic

Disconnect




CT Directional BHA Specifications

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

Hydraulic Orienting Tool

c/w Circulating SubCT Connector c/w

DF Check Sub Hydraulic Disconnect Quick Connect

Internal /

External

Pressure Sub

Non-mag Collar c/w

Directional Package and

Gamma Ray DF Check SubPositive Displacement

Mud Motor c/w SABHDrill

Bit

Total BHA Length ~13m

2 Stainless Steel Capillary Tubes for Orienting tool operation

1 Multi-conductor Wireline for Steering Tool / Gamma operation




The CTD™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 –

CTD™ Downhole Motor




CTD ™ Motor Issues/Contingencies

Power section designed and testing for high N2 and•temperature applications.

Testing of mud/elastomer interaction can be conducted at•Weatherford facilities in Houston

CTD™ Downhole Motor




Surface Equipment

Worksite Trailer

Driller’s Display

Remote Display

Interface Box




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 aFloating Production Vessel in the North Sea




Case Histories

Well BP Courson BuchanAlpha

NAL09-29 PCP 10-12 ParaRainbow

ParaRainbow

TVD (ft) 3458 9186 4110 4668 836 721

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




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

Case Histories




Well Thunder 15-

34

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) 192/494 132/1306

Formation Sand

ROP (ft/hr) 13 16

Max DLS (deg/100 ft) 15 1

H2S (%) 0

Temperature (deg F)

Failures none none

Case Histories




Risk Assesment

Risk Controlling Factors

Coiled Tubing Getting Stuck Do not stop pumps

Keep tubing moving

If it is necessary to stop pumping, move CT to safe

location

Follow procedure for disconnecting BHA

Identify the stuck mode/location (Annular pressure,

Orienter, Reactive torque)

Use different fluids (viscous gel, nitrogen)

Have fishing tools on location

Side Track in open hole




Risk

Directional tools fail holeExcessive 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

Risk Assesment

Controlling Factors




Future Projects

Well optimization (Drilling 9-5/8” from surface)

Re-Entry of existing wells (80% of experience is in Re-

Entries)

Larger Underbalanced hole with 4-1/8” OD BHA




Re-Entries with TT Whipstock




Multi-Laterales




Pre-Milled Windows




Thank You

ct drilling

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