DP-MASTER HEAVY WEIGHT DRILL PIPE

Public Release 12 Aug 2011

DP-Master Heavy Weight Drill Pipe

DP-Master heavy weight drill pipe offers a flexible

transition between the heavy rigid drill collars and

flexible drill pipe.

This transition helps to reduce the number of

fatigue failures seen directly above the bottom

hole assembly. Another use of heavy weight drill

pipe is to add additional weight to the drill bit.

DP-Master manufactures heavy weight drill pipe

in standard and spiralled from 3-1/2’’ OD up to 6-

5/8’’ OD.

Standard heavy weight drill pipe is friction welded.

Heavy weight drill pipe in accordance with NS-1

specifications is manufactured from an integral

bar of AISI 4137H modified alloy steel.

DP-MASTER HEAVY WEIGHT DRILL PIPE

Public Release 12 Aug 2011

Standard Heavy Weight Drill Pipe

Heavy Weight Spiral Drill Pipe

DP-Master standard heavy weight drill pipe assembly is made up of pin and box tool joints and a heavy weight tube with center upset or wear pad.

This configuration helps to prevent stress concentration which could otherwise occur and allows directional drilling with controlled torque and reduce differential pressure sticking.

The service life of the HWDP is extended to maximize your investment by;

Providing extra-long tool joint that increases tong space which allows more connection recuts.

Reducing wear rate on tube OD through additional protection by the center upset or wear pad which keep the tube away from the hole.

DP-Master heavy weight spiral drill pipe handles maximum stresses induced at tough drilling environments in vertical and directional wells.

The heavy weight spiral drill pipe shares many of the same features from the standard heavy weight drill pipe except that the pipe body has an enlarged center section with three spiral grooves.

The spiral design adds following advantages;

Better reduction in differential sticking

Increased weight and stiffness

Minimizes wear

Improves cutting circulation for better hole cleaning

Standard Heavy

Weight Drill Pipe

Heavy Weight

Spiral Drill Pipe

DP-MASTER HEAVY WEIGHT DRILL PIPE

Public Release 12 Aug 2011

Features and Options

Enhanced Fatigue Resistance

Cold rolling on the thread roots of every connection is necessary to increase the connection’s ability to resist failure from cyclic stresses on the thread roots when stiffer heavy weight drill pipe undergoes repeated severe tensile and compressive stresses at drilling operation. Cold rolling hardens the thread roots inducing compressive stress that minimise crack forming to increase fatigue resistance. API Bore back on the box connection or stress relief groove on the pin connection can further enhanced fatigue resistance on conventional API connections.

Increase Drill Pipe Life

Hardbanding on the tool joint or wear pad extends the service life of drill pipe. It can be applied in several configurations to suits clients requirements. Hardbanding is applied under closely controlled conditions resulting in a uniform, low porosity, wear resistant surface. DP-Master is authorised to apply market proven hardbanding products including ARNCO 100XT / 300XT, Tuboscope TCS8000 / TCSTI, Duraband NC, Tuffband NC and Castolin OTW 12. Extra length tool joints are incorporated into DP-Master heavy weight drill pipe to increase tong space to provide several recut to the connections.

High Performance Rotary Shoulder Connections DP-Master offers its DS and MT series double shoulder connections which outperform conventional API connections to meet the needs of deep, extended and challenging wells with greater torsional capacities.

Surface Protection Phosphate coating are applied to all heavy weight drill pipe connections to improve anti galling and corrosion. DP-Master can supply heavy weight drill pipe with any market available internal plastic coating. The coating forms a protective layer in the pipe ID to prevent corrosion and thus extend the life span of the pipe in the drilling environment.

Cold Rolling Hardens Thread Root Inducing

Compressive Stress that Minimise Crack

Forming To Increase Fatigue Resistance

DP-MASTER HEAVY WEIGHT DRILL PIPE

Public Release 12 Aug 2011

DP-Master Heavy Weight Drill Pipe Manufacturing Flow

Heavy Weight Tube Body Tool Joint

Green Tube

Laboratory Inspection

Normalising

Inspection Point

Straightening Pipe

Turning

UT & MPI Inspection

Heavy Weight Tube Body Ready for Welding

Assembly

Billet Saw Cut

Inspection Point

Blanking & Boring

Inspection Point

Austenitizing

Quenching

Tempering

Inspection Point

Threading & Finishing

Inspection PointInspection Point

Phosphate Coating

Tool Joint Ready for Welding

DP-MASTER HEAVY WEIGHT DRILL PIPE

Public Release 12 Aug 2011

Assembly

Ready For Welding

Pipe Body & Tool Joint Assembled By Inertia Friction Welding

Stress Relieve Welded Zone

Profiling

Tool Joint Alignment

Austenitizing, Quenching & Tmpering Weld Zone

Hardness Inspection Weld Zone

Weld Zone & Final Inspection Wet MPI, UT, Dimensional, Visual & Drift Test

Hardbanding

Internal Coating

Completed Heavy Weight

Drill Pipe Ready for

Shipping

Heavy Weight Drill pipe is manufactured to

applicable industry specifications and to

customer requirements. Each drill pipe is

inspected 100% at completion.

DP-MASTER HEAVY WEIGHT DRILL PIPE

Public Release 12 Aug 2011

Mechanical Properties

DP-Master Heavy Weight Drill Pipe Grades Table

DP-Master standard heavy weight drill pipe tube is manufactured from AISI 1340 steel or equivalent while the tool joints are supplied with AISI 4137H modified alloy steel material. Another option of heavy weight drill pipe in integral can be supplied upon request. All DP-Master steel tubes are procured from reputable bar supplies with strong quality track records.