Better Ways to The Bottom™

®Drilling with Drilling with CasingCasing

““Reduces Cost and RiskReduces Cost and Risk””PresentedPresented by: Bjarne Haugenby: Bjarne HaugenNFLB NFLB WinterconferenceWinterconference 20082008

Better Ways to The Bottom™

®

• Casing is rotated to drill, and provides hydraulic and mechanical force to the cutting structure.

• Cases the well as it is drilled.

• Casing is near bottom at all times.

• Casing is cemented in the well without tripping it out.

• Types• “Bit” attached to casing (drill in)• Retrievable & re-runable BHA• Rotary Steerable BHA

Oil Zone

Retrievable BHA

Casing is the

“Drillstring”

Surface Equipment

Casing Drilling:Process to simultaneously drill and case wells by using the casing as the drill string.

Better Ways to The Bottom™

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• Adapts to any Top Drive

• Automatic Link Tilt System

• Automatic Pick Up Elevators

Uses Top Drive for all Operations:

1. Make-up Connections.

2. Break-out Connections.

3. Rotate Casing String.

4. Drilling operation.

CDS™

CASING DRIVE SYSTEM™(CDS)

Better Ways to The Bottom™

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DLA - 3 / 4 System Components

Setting

Release ThenRetrieve

One Trip Releaseand Retrieve

EmergencyRelease

Drill Pipe

Wireline

Pump Down Release Tool(PDRT)

Hydraulic Setting Tool (HST with HSRT)

Wireline Setting Tool (WST)

Drill Pipe – Mech. Pulling Tool (MPT with HSRT)

Wireline – Wireline Pulling Tool (WPT)

Drill Pipe - Emergency ReleasePulling Tool (ERPT with HSRT)

Drill Pipe – Mechanical Releaseand Pulling Tool (MRPT with HSRT)

Wireline – Wireline Release Pulling Tool (WRPT)

Better Ways to The Bottom™

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Rotary Steerable BHA

Motor

UR

Stabilizers

MWD

RSS

Bit

Shoe

StraightBHA

URStab.

Bit

Retrievable toolsProven400 sections drilled (200 wells)20 directional sections, ~50,000 ft

Inclinations to horizontal

Rotary Steerable Systems

ProvenRoutinely available.Standard tool requirement.

Casing

Combining Casing Drilling & Rotary Steerable

Better Ways to The Bottom™

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Landing & Drill Lock

Profile

DOWNHOLE TOOLS

CASING DRILLING® AssemblyCentralizers

as req’dCasing Shoe

Casing Underreamer BitConnection Ring

Wireline Retrievable BHA

Running & Retrieving

Tool

Torque Locks Underreamer BitTool

LocatorMud Motor,

Directional Tools and/or Logging

Assembly as required

Drill Lock Assembly (DLA)

Axial Locks

Wear Band

Better Ways to The Bottom™

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CASING ACCESSORIES

• Torque Improvement– Multi-Lobe Torque Rings

• Wear Resistance– Hydro-formed Centralizers– Wear Bands & Wear pads– Wear Resistant Couplings

• Stabilization and Centralization– Hydro-formed Centralizers– Stabilizers (Integral or HF)– Non-rotating stabilizers

• Drilling/Guide Shoes• Bit Release Tool

– When bit screwed directly onto casing

• Cementing– Pump Down Cementing Float

(PDCF)

Better Ways to The Bottom™

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LANDING / SETTING DLA

• Tools are run in or pumped in on Wireline

• Fluid does not go through BHA, but rather bypasses to outside below Packer Cups

• “Stop Dogs” locate BHA into Casing Profile Nipple

• Pressure up to shift Mandrel, close bypass, set Axial Locks and release Running Tool

• Rotation engages Torsional Locks

Better Ways to The Bottom™

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RELEASING / RETRIEVING DLA

• Run in or pump in retrieving tool on wireline

• Pressure up to engage onto the DLA

• Continue to pressure up to open bypass and release axial locks

• Pull BHA out of casing

Better Ways to The Bottom™

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DIRECTIONAL DRILLING

• Can run a conventional bent housing/motor combination

• Can run a Rotary Steerable assembly

• Can run a conventional building/holding/dropping assembly

• Use Pump Down Release Tool (PDRT) to release DLA and slide casing over BHA prior to pumping wireline

Better Ways to The Bottom™

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CORING

• Attached a conventional core barrel to the DLA

• Run BHA and latch into profile nipple in casing

• Underream while coring as normal

• Retrieve core quicker and safer through casing by retrieving DLA

• Can quickly shift from drilling to coring operations and back

Better Ways to The Bottom™

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LOGGING

• Log while drilling (LWD) in pilot hole below underreamer

• Pull casing back, retrieve the DLA and log out the end of casing using conventional open hole wireline tools

• Log through the casing (cased hole logs)

Better Ways to The Bottom™

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CEMENTING

• After reaching casing depth, retrieve DLA

• Install Pump Down Cement Float (PDCF), and pump to profile nipple

• Pump wiper plug

• Pump cement

• Pump displacement plug

• Bleed off pressure, float holds

• Float self locking for easy drillout

Better Ways to The Bottom™

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WELLBORE STRENGTHENING• Significant reduction in lost

fluids when Drilling with Casing due to “Plastering Effect” (continuously trowelling of the wellbore wall by the couplings)

• Losses are Reduced even with higher ECD’s

• Filter Cake is smeared into the wall and is not scraped off by bit passage or tool joint impacts

• Cuttings are ground up finer and indications show less cuttings return to surface, instead they are smeared into the wall, strengthening the wellbore

Better Ways to The Bottom™

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7”Csg.

$7,000 Trouble

8,143’

Casing Drilling®

9 5/8”Csg.

4 1/2”Csg.

Conventional

9 5/8”Csg.

$184,000 Trouble

4,380’

Conventional Rig• Drilled & set surface csg• Lost circ at 4,380 ft• Could not cure lost circ.• Temp. abandoned well with cmt. plugs

Drilling With Casing Rig• Moved over well• Drilled out plugs, lost immediate returns• Cured lost circ. by drilling ahead• Well completed

LOST CIRCULATIONPlastering / Smear Effect

South Texas Lobo Field

Better Ways to The Bottom™

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WELL CONTROL

• Influxes are reduced due to “Plastering/Smear Effect”

• Continuous circulation even when tripping for new BHA’s prevents surge or swab conditions

• Casing on bottom of well improves kick control procedures

• Reduced trip times reduces influxes

• Well can be killed with a higher pump rate, increasing the ECD (Equivalent Circulating Density)

Better Ways to The Bottom™

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ADVANTAGES Of Drilling With Casing

• Improved Personnel Safety

• Reduced Rig Requirements

• Time Savings

• Improved Well Control

• Improved Borehole Stability

• Reduced Lost Circulation

• Improved Production

Lost circulation

Stuck Pipe

Kick

Sloughing Shale

Other

Unscheduled events account for 24% spud to TD time

(Jan 2004 Offshore magazine)

Better Ways to The Bottom™

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Casing Size, in.

Casing weight,

lb/ft

Casing Grade

Maximum curvature, deg/100 ft

5.5 17 P110 137 23 L80 8

9.625 36 J55 4.513.375 54.5 J55 3

Allowable Build Rates not too Restrictive

Better Ways to The Bottom™

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DRILLING WITH CASINGReduces Costs / Reduces Risks

Better Ways to The Bottom™

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Complexity

Drilled with disposable bit

Drilled with drillable shoe. i.e. EZ Case

Drilled with retrievable assembly

26620

502

53Drilled while Coring with Casing5

13

Directional Casing Drilling

Casing Drilled with Rotary Steerable Tools

CASING DRILLING® Experience

Sections drilled

OVER 2.4 MILLION FEET DRILLED WITH CASING

Better Ways to The Bottom™

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Tesco Corporation Product Lines

• Top Drives• Hydraulic and Electric•150 - 650 Ton

• Casing Drilling

• Casing Running• Casing Drive System (CDS®)

• Multi Control Line Running System (MCLRS)

Better Ways to The Bottom™

®

Thank You