B E T T E R W A Y S T O T H E B O T T O M

Bulletin 30000e

T E S C O C A S I N G D R I L L I N G Reach your reservoir with more efficiency and flexibility.

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SOUTH AMERICA

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Houston, Texas

Bryan, Texas

Kilgore,Texas

Springtown, Texas

Conway, Arkansas

Grand Junction, Colorado

Calgary, Alberta

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NORTH AMERICA EUROPE26

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Aberdeen, U.K.

Stavanger, Norway

Bergen, Norway

ASIA31

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Moscow, Russia

Beijing, China

Singapore

Jakarta, Indonesia

AUSTRALIA35

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Perth, Australia

Te Puke, New Zealand

MIDDLE EAST29

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Doha, Qatar

Dubai, United Arab Emerites

Quito, Equador

Bogota, Columbia

Maracaibo, Venezuela

El Tigre, Venezuela

Moroso, Brazil

Macei, Brazil

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Sao Mateus, Brazil

Rio de Janeiro, Brazil

Salta, Argentina

Buenos Aires, Argentina

Neuguen, Argentina

Rio Gallegos, Argentina

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Grande Prairie, Alberta

Nisku, Alberta

Red Deer, Alberta

Reynosa, Mexico

Villahermosa, Mexico

Ciudad del Carmen, Mexico

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Wherever Youre Working, TESCO CASING DRILLING Works Better

CASING DRILLING is ready to go right out of the box when and where you

need it. Anywhere in the world.

Borehole problems can occur anytime, anywhere. CASING DRILLING delivers

all of the functionality of conventional drillpipe drilling, with greater effi ciencies

and improved safety.

Specialized TESCO technicians deploy this time-tested, proven process for

customers in virtually every producing region, backed by the resources of a global

organization. In-depth CASING DRILLING expertise and equipment are at hand

when you need to reach bottom.

The Proof is in The Drilling

CASING DRILLING is innovation in action technology that

gets casing to bottom by circulating, reciprocating and rotating

simultaneously. Every well is drilled and cased at the same time.

By using the full capabilities of your rigs top drive, the system

is the solution: CASING DRILLING is a proven process after millions

of feet drilled, on- and off shore, straight, directional and horizontal

wells.

Because of its application fl exibility, CASING DRILLING can

successfully execute anything that can be accomplished with

conventional drilling, while delivering operating and labor cost

savings, capital investment reductions and faster time-to-targets.

With CASING DRILLING, casing is always on bottom, letting

you change your bottom hole assembly (BHA) without a trip.

The process requires less drilling fl uid, further reducing costs and

environmental impact: the mechanical characteristics of the casing

plaster cuttings into the face of the bore hole, sealing pores in the

formation that contribute to lost circulation.

Directional and horizontal applications have been proven

on- and off shore. Directional CASING DRILLING has been used

successfully in diffi cult shales in North America; in completing

complex 3D North Sea wells; and in drilling extended reach wells

further examples of the fl exibility and adaptability of CASING

DRILLING in a wide variety of hole angles, with on-bottom ROPs

equal to or better than conventional methods.

With the ability to rotate and reciprocate while circulating uid, CASING DRILLING can accomplish what conventional drilling can and more.

CASING DRILLING is an engineered solution for di cult drilling situations. With surface rotation rates of 120 rpm for 9 5/8 and 13 3/8casing, (150 rpm for 7), casing becomes a very e ective drill string.

P A G E 3

P A G E 4

reaming shoe to work casing to the bottom. The CDS can rotate and

reciprocate the casing with continual fl uid circulation.

When the goal is to drill an original straight hole, TESCO

professionals replace the reaming shoe with an expendable bit or

drillable casing bit and use either a liner with drillpipe or casing to

drill a new borehole with casing always on bottom.

TESCO has perfected and proven retrievable CASING DRILLING

systems. Drillpipe or wireline can be deployed for multiple bit runs in

applications where either straight or directional/steerable wells are

required or straight holes that requires multiple bit changes.

The exclusive TESCO Drill Lock Assembly (DLA), used as a

part of the BHA, plays a key role in the retrieval of tools from the

bottom. When setting the DLA, tools are run in either on drillpipe

or wireline. Stop dogs locate the BHA and create a landing and lock

profi le. Once pressure is applied, axial locks are set and the running

tool is released while rotation engages torsional locks. Retrieval

is accomplished using pressure to engage DLA, open bypass and

release axial locks.

CASING DRILLING can be accomplished on nearly any rig with a

top drive. Our tools and people both work toward keeping casing on

bottom throughout the drilling process.

TESCO CASING DRILLING Scenarios

The simplicity of CASING DRILLING is one of the main reasons it is

attractive to many E & P operators. CASING DRILLING requires few

adaptations to a standard drilling rig and in most cases can be accomplished

in just a few hours. Basics include a top drive and TESCOs Casing Drive

System (CDS) that together serve as the workhorse for CASING DRILLING

operations. Installed just below the top drive the CDS improves operational

effi ciencies through its ability to circulate, rotate and reciprocate the casing

string simultaneously.

Depending on your drilling objective, TESCO has tools, processes and

people to get you to bottom.

Keeping It Simple:TESCO CASING DRILLING Adaptability

Simplicity and adaptability are hallmarks of the proven CASING DRILLING

solution. It requires few adaptations to a standard drilling rig in most

cases, just a few hours of rig-up time. From basic casing running procedures

to complex drilling scenarios, CASING DRILLING gets the job done with

superior effi ciency.

For example, for simply driving casing to the bottom, CASING DRILLING

requires only a Casing Drive System (CDS) attached to a top drive and a

Drilling Objective Benefi ts Tools # Bit Runs People on Rig Floor

Driving Casing to Bottom. Ability to Pump, Rotate and Work Casing to the Bottom CDS Reaming Shoe

NA 1

Drilling a Straight Hole. CASING DRILLING with a Drillable or Expendable Bit CDS Expendable or Drillable Bit Liner with Drill Pipe or Casing to the Surface While Drilling

One 1

Drilling Straight and Directional or Steerable Holes. Tools Retrievable with Wireline.

CASING DRILLING with Retrievable BHA CDS Drill Lock Assembly BHA Liner with Casing to the Surface While Drilling

Multiple 1

Drilling Straight and Directional or Steerable Holes. Tools Retrievable with Drill Pipe.

CASING DRILLING with Retrievable BHA CDS Drill Lock Assembly BHA Liner with Casing to the Surface While Drilling

Multiple 1

P A G E 5

TESCOs Casing Drive System minimizes rig personnel, improving productivity while enhancing work site safety.

P A G E 6

0

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sure

d Dep

th, ft

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Drilling Days

Well 1Well 2CASING DRILLING

Set 7

Set 4-1/2

Set 7

Set 7Set 5-1/2 liner

KickKick

Conventional Drilling

CASING DRILLING expertise and technology together help control

and minimize todays borehole integrity issues and other drilling

challenges.

When using casing as a drill string, cuttings are smeared into the

wall of the wellbore. This not only results in reduced cuttings at the

surface, it automatically strengthens the wellbore and reduces lost

circulation.

CASING DRILLING signifi cantly reduces lost fl uids due to this

Plastering Eff ect (see page 7) and enhances reservoir productivity

from producing horizons.

Improved well control is enhanced with continuous circulation

even when tripping. Having casing constantly on the bottom

reduces well kicks creating a safer environment.

The CASING DRILLING process increases safety because it

requires fewer people on the rig fl oor and less pipe handling than

conventional drilling. It also minimizes or eliminates unscheduled

events which lead to tripping the drill-string, kicks, casing wear, and

unintentional sidetracks.

CASING DRILLING design provides superior strength and rigidity

in drilling operations. It has proven capable of withstanding

dynamic downhole loads while maintaining standoff under

large side forces without crushing. Underbalanced drilling, well

completions and other operations can be executed without killing

the well to trip pipe.

Paired with the appropriate TESCO top drive, CASING DRILLING

also maximizes the effi ciency of horizontal drilling operations

further evidence of the systems adaptability from top to bottom.

Lost circulation resulted in two unsuccessful attempts to reach bottom using conventional drilling methods. The CASING DRILLING process, used in the third attempt, encountered no lost circulation and delivered a viable wellbore to the operator when drill pipe drilling could not.

CASING DRILLING has been proven to reduce NPT while improving drilling e ciencies. Lost circulation, stuck pipe, kicks and sloughing shale are all minimized by CASING DRILLING.

Delivering Under Pressure: TESCO CASING DRILLING Top to Bottom

P A G E 7

Reducing Non-Productive Time

An added benefi t of the CASING DRILLING process is the Plastering Eff ect,

or smearing, caused by continuous trowelling of the wellbore wall by the

casing. Filter cake is smeared into the wall and is not scraped off by bit

passage or tool joint impacts. Cuttings are ground up more fi nely.

Generally, fewer cuttings return to the surface; instead they are smeared

into the wall, further strengthening the wellbore which off ers the additional

benefi t of improved well control and stability.

Circulation losses are reduced even with higher Equivalent Circulating

Densities (ECD). As demonstrated by the CASING DRILLING process, smearing

has a particularly good eff ect when drilling through medium- and high-

density rock. The Plastering Eff ect coupled with industry best practices leads

to curing lost circulation and enables continuous drilling.

Of all the benefi ts associated with CASING DRILLING cost savings,

safety, effi ciency one of the primary benefi ts is this: In many cases, you

can save at least one trip even in zones where lost circulation persists. That

key benefi t alone gives operators a case to consider CASING DRILLING.

CASING DRILLING reduces incremental costs. Many drilling engineers

plan and budget their drilling operations to account for all activities

positive and negative. If a particular fi eld typically encounters trouble

zones, the drilling engineer will plan and budget for those trouble zones

accordingly. Preventing and recovering from trouble is often anticipated

so as not to show up as an unscheduled event, but as a routine drilling

operation. The routine can add ever-increasing incremental costs to

operators, especially those who are trying to tap even more diffi cult

reservoirs.

Sometimes routine operations are activities, or costs, that could

be eliminated with a diff erent drilling system.

Lost circulation and well control incidents are almost completely

eliminated in wells drilled using CASING DRILLING. Wells that

encounter a weak zone before or after a high-pressure zone while

drilling with drillpipe often fi nd it diffi cult to balance the lost

circulation potential in the in the upper zone with well infl uxes in

the lower zone, particularly when tripping out of the hole with

drill pipe. TESCO encourages operators to drill ahead through lost

circulation when CASING DRILLING. Just as one might plan for a

short trip or a conditioning trip as a prudent practice, a certain

amount of time might be budgeted to deal with problems relating to

lost circulation in environments where it is likely to occur. Identifying

these hidden costs can make CASING DRILLING even more attractive

and drilling budgets extend further.

PLASTERING

Casing coupling is forced against the bore wall as it advances into the borehole.

As mud is smeared into the formation, lter cake builds up on the borehole wall.

Filter cake and cuttings are plastered against the borehole wall by the coupling, sealing porous formations .

Variations in the straightness of casing smear drill cuttings, sealing pores in formations in what is known as the Plastering E ect.

P A G E 8

Wear-resistant Couplings

TESCO produces wear-resistant accessories to protect casing against excessive abrasions during drilling. Wear Bands are tungsten carbide coated rings installed below the coupling to protect the connection. Wear Sleeves protect the joint from undue wear and prevent buckling near the bottom of the drill string

Pump Down Displacement PlugTM

TESCOs Pump Down Displacement Plug (PDDPTM) is a cementing accessory for use with CASING DRILLING and Casing Running operations. The PDDP is pumped behind the cement job to displace the cement replacing conventional displacement plugs. It can be pumped down at normal pump rates and lands in the casing profi le nipple. When landed, the solid plug holds backpressure preventing backfl ow and allows operators to continue with minimized risk of cement U-tubing.

Targeting and Meeting any Objective: TESCO CASING DRILLING Tools

Almost any on- or off shore drilling rig can be adapted to use the

CASING DRILLING technology. Converted conventional rigs lose

none of their capabilities.

Portable TESCO Top Drives can be easily installed on rigs without

top drives. The TESCO Casing Drive System (CDS), integral to

CASING DRILLING, is the industrys proven workhorse for getting

casing on bottom. The versatility gained by conversion to a dual-

purpose rig makes it suitable for use on a wider range of wells and

increases opportunities.

TESCO has a wide range of equipment for the CASING

DRILLING process to meet any drilling challenge. Together with

knowledgeable and experienced TESCO drilling professionals, theres

no downhole environment off limits no missed opportunities for

more effi cient, more successful projects.

Multi-Lobe Torque (MLT) Rings

The TESCO MLT ring is a high performance, low cost connection enhancement that delivers premium performance to standard API Casing and Tubing. MLT rings fi t standard API off the shelf casing and tubing extending the utility of operator pipe inventories. They are particularly eff ective when used on problem wellbores with a top drive and CDS. Installation is fast and easy and can be done at well-site, pipe yard or mill. MLT rings are compatible with full API make-up tolerances through a unique gauging system and a selection of ring heights specifi c to the size and weight of the tubing or casing. Substantial connection torque capacity improvement can be realized with this technology

Underreamer

Directional Tools

Torque Locks

Drill Lock Assembly

ToolLocator

Axial Locks

Bit

P A G E 9

Hydro-Form Centralizers and Stabilizers

Hydro-Form Centralizers are used in the casing string to facilitate improved cementing. Stabilizers are used at the bottom of a drill-in CASING DRILLING string to stabilize the BHA (Bottom Hole Assembly). TESCOs patented design and attachment method provides superior strength and rigidity capable of withstanding dynamic downhole loads while maintaining standoff under large side forces without crushing. TESCOs Centralizers and Stabilizers provide positive centralization for cementing in vertical and deviated wells for both CASING DRILLING and Casing Running applications. These accessories facilitate rotation of the casing string, a signifi cant advantage for cementing operations.

Warthog

The TESCO Warthog, our exemplary Casing Running and Reaming Tool (CRRT), helps get your casing to TD despite compromising hole conditions such as bridges, ledges, doglegs, sloughing formations and deviated holes. The Warthog combines hydraulic and mechanical energy to break through downhole obstructions and a nosecone profi le that cleans and circulates simultaneously. Three spiral helix external blades help condition the hole and provide centralization for cementing.

ORB - Once Retrievable Bit

The ORB is TESCOs one-trip drill shoe for vertical or tangent intervals. The cutting structure is inserted into the drill shoe at the surface level. UR arms, pilot bit and the center portion of the ORB bit are retrieved with wireline once TD is reached.

TesTORK Torque Monitoring Service

The TesTORK Torque Monitoring Service gives TESCO clients an easy method for monitoring connection assembly torques and provides an audit trail for connection make-up. The portable, robust system is easily set-up and confi gured. Torque calibration occurs at the rig fl oor and at the connection level and can be done in a matter of minutes. Run by a single operator, TesTORK keeps a tally of casing and an accurate diary of make-up events. TesTORK insures data integrity, security and reports in metric and SI units.

P A G E 1 0

Setting New Standards With Standard Technologies

Wherever you drill for oil and gas, TESCO CASING DRILLING has

been proven in vertical and directional applications with virtually

every standard technology used today.

From Rotary Steerable applications to logging and measurement

while drilling (LWD/MWD), to coring, the CASING DRILLING

solution delivers superior results.

The CASING DRILLING process has been used to successfully

complete hundreds of wells: vertical, directional and horizontal.

CASING DRILLING has proven itself an exceptionally viable

drill string tubular, capable of drilling build rates of up to 13 per

hundred feet while maintaining a better ability to keep on the

well path.

The process is successfully operated onshore and off shore,

including off shore wells with 70+ holes at over 12,000 feet,

using LWD/MWD with mud motors and rotary steerable

systems.

Far more than a shallow well technology, TESCO has used

CASING DRILLING for its customers at 1,000-foot depths and up

to 15,500 feet of hole.

The process works with conventional rigs, delivering CASING

DRILLING benefi ts with minimal rig modifi cations.

Wells drilled with CASING DRILLING can be readily logged via

conventional wireline, cased hole and LWD methods.

CASING DRILLING virtually eliminates loss circulation. Its proven

Plastering Eff ect enhances reservoir productivity by reducing or

eliminating fl uid losses to the producing horizon.

Core samples are collected through conventional core barrel

attached to the DLA: core samples are retrieved more quickly and

safely by retrieving the DLA.

With hundreds of intervals and millions of feet of hole, proven in vertical, horizontal and under-balanced wells, on and o shore, and in more than 30 geological basins around the world, CASING DRILLING is changing how wells are drilled.

Changing The Way Leading The Way

Speed, safety and effi ciency are equally critical when it comes to

drilling eff ectiveness and getting you to TD every time.

At TESCO, our people work closely with one another and

with our customers to provide innovative, cost-saving and

environmentally friendly drilling technology and services that

get you to bottom...right out of the box.

Drilling is more than just our passion. Its in our blood. So it

should be no surprise that when it comes to innovative drilling

technology, TESCO continues to lead the way to improving

drilling effi ciency and Better Ways to The Bottom around the

world.

To learn more about TESCO, visit us at www.tescocorp.com.

Tesco Corporation is an industry leader in the development and commercialization of drilling technology and services. The Corporations mission is to change the way wells are drilled. By reducing drilling risk and increasing operational effi ciency, TESCO generates real value for its customers. TESCOs powerful combination of engineering and service excellence is provided by experienced and dedicated fi eld personnel. Coupled with a passion for innovation, TESCO off ers a comprehensive toolbox of proven technologies and delivers superior solutions at the wellbore. With a vision spanning the crown to the bit, from the desert to deepwater, around the world TESCO technology provides Better Ways to The BottomTM.

Corporate Headquarters3993 W. Sam Houston Parkway N.Suite 100Houston, Texas 77043 USATel: 713-359-7000Fax: 713-359-7001

Email: marketing@tescocorp.comwww.tescocorp.com

TESCO, TESCO CASING DRILLING, CASING DRILLING, Casing Drive System, CDS, MCLRS, PDDP, MLT, Markfree, Warthog, TESCO TUBULAR SERVICES, ULTREX, Hydro-Form, TesTORK and Better Ways to The Bottom are trademarks of Tesco Corporation.

Tesco Corporation/ April 2008/ POD/ All rights reserved