Heavy Weight Drill Pipe 4 1/2inch 41.8 Lb ft NC-46 Connection
HWDP is used as a transitional stiffness section, typically between
the stiff and rigid drill collars and the relatively light and
flexible drill pipe joints to reduce fatigue failures directly
above the bottom hole assembly.
A Heavy Weight Drill Pipe (HWDP) looks like a normal drill pipe
except for an upset centered along the tube which helps to prevent
excessive buckling.
Its wall thickness is up to 3 times that of a similar-sized normal
drill pipe to add additional weight to the bit.
HWDP is used most commonly in directional drilling because it bends
more easily and helps to control torque and fatigue in high-angle
operations.
| Nominal Size (Tube OD) | Tube | Tool Joint (in) |
| | ID (in) | Elevator Upset | Center Upset | Connection Type & Size | OD (in) | ID (in) |
| 2-7/8 | 1-1/2 | 2-15/16 | 3-5/16 | NC 26 (2-3/8 IF) | 3-3/8 | 1-1/2 |
| 3-1/2 | 2-1/16 | 3-7/8 | 4 | NC 38 (3-1/2 IF) | 4-3/4 (4-7/8,5) | 2-1/16 |
| 3-1/2 | 2-1/4 | 3-7/8 | 4 | NC 38 (3-1/2 IF) | 4-3/4 (4-7/8,5) | 2-1/4 |
| 4 | 2-9/16 | 4-3/16 | 4-1/2 | NC 40 (4FH) | 5-1/4 | 2-9/16 |
| 4 | 2-1/2 | 4-3/16 | 4-1/2 | NC 40 (4 FH) | 5-1/4 | 2-1/2 |
| 4-1/2 | 2-3/4 | 4-11/16 | 5 | NC 46 (4 IF) | 6-1/4 | 2-3/4 |
| 4-1/2 | 2-11/16 | 4-11/16 | 5 | NC 46 (4 IF) | 6-1/4 | 2-11/16 |
| 4-1/2 | 2-13/16 | 4-11/16 | 5 | NC 46 (4 IF) | 6-1/4 | 2-13/16 |
| 5 | 3 | 5-1/8 | 5-1/2 | NC 50 (4-1/2 IF) | 6-5/8 | 3 |
| 5-1/2 | 3-1/4 | 5-11/16 | 6 | 5-1/2 FH | 7 (7-1/4,7-1/2) | 3-1/4 |
| 5-1/2 | 3-3/8 | 5-11/16 | 6 | 5-1/2 FH | 7 (7-1/4,7-1/2) | 3-3/8 |
| 5-1/2 | 3-7/8 | 5-11/16 | 6 | 5-1/2 FH | 7 (7-1/4,7-1/2) | 3-7/8 |
| 5-1/2 | 4 | 5-11/16 | 6 | 5-1/2 FH | 7 (7-1/4,7-1/2) | 4 |
| 6-5/8 | 4 | 6-15/16 | 7-1/8 | 6-5/8 FH | 8 (8-1/4,8-1/2) | 4 |
| 6-5/8 | 4-1/2 | 6-15/16 | 7-1/8 | 6-5/8 FH | 8 (8-1/4,8-1/2) | 4-1/2 |
| 6-5/8 | 5 | 6-15/16 | 7-1/8 | 6-5/8 FH | 8 (8-1/4,8-1/2) | 5 |
| Standard Features | API Bore Back Box Connection |
| API Stress Relief Grooved Pin |
| Cold Rolled Thread Roots |
| Phosphate coated connections |
| Options | Internal Plastic Coating |
| Hardband Type especially on box and pin tool joint |
| Proprietary Connections |
| Make and Break Test |
| Protection | Pressed steel thread protectors |
| Mill Test Certificates | Issued in accordance with API Spec 7/7-1 and API RP7G . |
| Third Party Inspection can be performed on request at buyer’s care
and expense. |
HWDP Specifications
Conventional Heavy Weight Drill Pipes come in two configurations,
Welded and Integral.
The welded configuration is manufactured by friction welding of
extra-long tool joints to a thick well tube while the integral
configuration is machined from a solid bar of AISI4145H alloy
steel.
An additional option is the Heavyweight Spiral Drill Pipe, which
has spiral grooves cut into the external surface for reduced
differential sticking and improved hole-cleaning.
Products are manufactured to API Spec.7/ 7-1 where applicable and
can come customized with additional features and proprietary
connections of leading manufacturers per your requirements.
Contact us to discuss your requirements.
For more information please contact:
Skype: ROSCHEN.TOOL , ROSCHEN_GROUP
WeChat: +86-137 6419 5009 ; +86-135 8585 5390
WhatsApp: +86-137 6419 5009 ; +86-135 8585 5390
Email: roschen@roschen.com ; roschen@roschen.net
Website: http://www.roschen.com ; http://www.roschen.net
