Casing Rotary

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TESCO

CASING DRILLING

A safer, more efficient way to reach the reservoir

Bulletin 300

The Drilling Innovation Company


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TESCO, The Drilling Innovation Company, hasnvested $50 million and six years of intensiveesearch and development in elevating theevolutionary CASING DRILLING processrom an experimental procedure to a provenuccess. The process, which eliminates drill-tring tripping, is inherently more cost-efficientnd safer than conventional rotary drilling. Itan cut the time required to drill a well by 20o 30%, helps avoid unscheduled events, savesperating and labor costs, and reduces capital

nvestment through faster field development.

Simultaneous drilling and casingaves time

n the CASING DRILLING process, thewell is drilled and cased simultaneously, usingtandard oilfield casing. The bottomholessembly (BHA) is latched into the bottom jointf casing and is run and retrieved through theasing, via wireline. Using wireline to conveyhe BHA is much faster than conventionalripping with a drill string.

For directional and horizontal wells, theCASING DRILLING BHA can be fittedwith conventional steerable motor andMWD tools or with Rotary SteerableSystems. LWD can readily be included,also. Since these tools are run andretrieved inside casing, they are protectedfrom the harsh downhole environmentwhile in transit. Drilling contractorsexisting rig fleets can be easily modifiedor adapted to accommodate the CASING

DRILLING process. For servicecompanies, the process presents newopportunities for tool development.

Elimination of drill-stringtripping increases safety

The CASING DRILLING processincreases safety because it requires fewerpeople on the rig floor and less pipehandling than conventional rotary drilling.It also eliminates unscheduled events that

result from tripping the drill-string kicks,unintentional sidetracks, casing wear,hole problems due to swab and surgepressures, and formation sloughing andswelling.


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TESCO

Split Crown

PLC control room

BOP handling andtesting system

The Drilling Innovation Company

GENESIS Series

CASING DRILLING Rig

and Drilling Machinery


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ated pipestems

Break-A-Waystabbing protectors

Hydraulic powered slips

Top Drive with splittraveling blocks andwireline BOP

Top Drive with InternalCasing Drive System

Hydraulic stabbing armassembly for automatedpipe handling

Power catwalk

Break-A-Waystabbing protectors


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Process reduces costs and environmentalmpact

Because the CASING DRILLING process eliminatesrill-string tripping, the rig requires only a Range III single

mast. Therefore, the rig is smaller, it can be moved inewer loads, and it requires less horsepower, reducingapital investment. The CASING DRILLING processlso requires less drilling fluid, which further reducesosts and environmental impact.

The TESCO CASING DRILLINGprocess has also beenemonstrated to add value through improved boreholeuality and reduced reservoir damage. Better boreholeuality translates to improved cement jobs, better quality

ogs and reduced risk from wellbore instability. The provenPlastering Effect resulting from TESCOs technologyan enhance reservoir productivity through reducing orliminating fluid losses to the producing horizon. Overall ,roject economics can be greatly enhanced by accessingnd proving deliverability of otherwise marginal reserves.

Rigs can be retrofitted or purpose-built

Retrofitting an existing rig with CASING DRILLINGquipment is easy to do and does not interfere with itsse for conventional drilling. The versatility gained byonverting it to a dual-purpose rig makes it suitable forse on a wider range of wells and increases contractpportunities for its owner.

New land rigs in various designs are available from TESCOwith all necessary CASING DRILLING equipment fullyntegrated into the rig package. This equipment includesTop Drive, internal and external drive systems for rotating

he casing, and a wireline winch for running and a retrievinghe BHA and other downhole tools.


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TESCO has a wide range offit-for-purpose equipment

The fit-for-purpose equipment TESCOhas developed for the CASING

DRILLINGprocess includes pump-down

and pulling tools for the BHA and a Drill

Lock Assembly (DLA) that secures the

BHA to the casing. Specially designed

underreamers provide an excellent rate

of penetration (ROP) and have a reliable

collapse mechanism for tripping.

In addition to these downhole tools

TESCO has developed many CASINGDRILLING accessories, including:

stabilizers; centralizers; wear protection;

cement floats; and, casing connection

torque rings. These accessories are

specifically designed to protect the

casing from drilling wear, centralize the

casing properly for optimal cementing,

and ensure that standard oilfield casing

connections can be used reliably in a

variety of vertical and directional well

designs.

In addition to their proven value in

CASING DRILLING applications many

of these accessory items also are used

with TESCOs Casing Drive System

to help ensure that casing strings can

be successfully run in troublesome

conventionally drilled wells.

Additional informationavailable on the Web

Additional information about the advantages of the CASING DRILLIprocess is available at

www.tescocorp .comOperato
http://www.tescocorp.com/casingdrillinghttp://www.tescocorp.com/casingdrilling


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TESCO

Duetoongoingproductdevelopment,allspecificationsaresubjecttochangewithoutnotice

CASINGDRILLING

is

aregisteredtrademarkandCasingDriveSystemaretrademarksofTescoCorporation

Benefits of the CASING DRILLINGProcessOperators, drilling contractors and service companies all can profit fromhe CASING DRILLING process.

For operators, it:reduces drilling time and lowers costsimproves wellsite safety and well controlreduces unscheduled eventsprovides a quicker return on investment

lessens environmental impact.

For drilling contractors, it:eliminates the need for drillpipe and drill collarseliminates the need for double and triple masts and heavy setbackareasmakes rig moves easierreduces labor requirementsreduces fuel consumption and wear on equipmentlessens the chance of pipe-handling incidentslowers capital requirements.

For service companies, it:opens up a new service marketprovides an additional application for existing tools and an opportunityto develop new tools to gain market shareextends tool life by protecting tools during running and retrievalreduces time and risk in recovering from downhole tool failure.

The Drilling Innovation CompanyEmail: [email protected] Web: www.tescocorp.com

Corporate Headquarters

6204 - 6A Street S.E.

Calgary, Alberta, Canada T2H 2B7

Tel: 403 692-5700 Fax: 403 692-5710

World Wide Operations

11330 Brittmoore Park Drive

Houston, Texas, USA 77041

Tel: 713 849-5900 Fax: 713 849-0075

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