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.
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.
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.
HWDP is manufactured in accordance with API Spec. 7/7-1 guidelines.
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.
| 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 4 |
2-9/16 2-1/2 |
4-3/16 4-3/16 |
4-1/2 4-1/2 |
NC 40 (4FH) NC 40 (4 FH) |
5-1/4 5-1/4 |
2-9/16 2-1/2 |
| 4-1/2 4-1/2 4-1/2 |
2-3/4 2-11/16 2-13/16 |
4-11/16 4-11/16 4-11/16 |
5 5 5 |
NC 46 (4 IF) NC 46 (4 IF) NC 46 (4 IF) |
6-1/4 6-1/4 6-1/4 |
2-3/4 2-11/16 2-13/16 |
| 5 | 3 | 5-1/8 | 5-1/2 | NC 50 (4-1/2 IF) | 6-5/8 | 3 |
| 5-1/2 5-1/2 5-1/2 5-1/2 |
3-1/4 3-3/8 3-7/8 4 |
5-11/16 5-11/16 5-11/16 5-11/16 |
6 6 6 6 |
5-1/2 FH 5-1/2 FH 5-1/2 FH 5-1/2 FH |
7 (7-1/4,7-1/2) 7 (7-1/4,7-1/2) 7 (7-1/4,7-1/2) 7 (7-1/4,7-1/2) |
3-1/4 3-3/8 3-7/8 4 |
| 6-5/8 6-5/8 6-5/8 |
4 4-1/2 5 |
6-15/16 6-15/16 6-15/16 |
7-1/8 7-1/8 7-1/8 |
6-5/8 FH 6-5/8 FH 6-5/8 FH |
8 (8-1/4,8-1/2) 8 (8-1/4,8-1/2) 8 (8-1/4,8-1/2) |
4 4-1/2 5 |
| Standard Features |
API Bore Back Box Connection API Stress Relief Grooved Pin Cold Rolled Thread Roots Phosphate coated connections |
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| Options |
Internal Plastic Coating Hardband Type especially on box and pin tool joint Proprietary Connections Make and Break Test |
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| Protection |
Pressed steel thread protectors |
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| 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. |
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