HEAVY WEIGHT DRILL PIPE
API 7-1, API 7-2
Features and Benefits
● A center upset or wear pad to increase tube life, reduce hole drag and differential sticking problems.
● Connections are completed (phosphate coated) to protect them from the elements after machining and to help prevent galling upon initial make-up.
● Thread roots are cold rolled on API and H-90 connections. And pressed steel thread protectors are supplied for standard connections.
● Hardbanding and Internal Coating can be provided on customer’s request.
When inquiring for HWDP, please specify:
● HWDP OD and ID.
● Overall length.
● Connections required (size and type).
● Special features desired, for example: integral, welded, or spiral HWDP
● Stress Relief Features.
● Hardbanding
Material Requirements:
API 7-1 specifies the material requirements for Heavy Weight Drill Pipe. Similar to drill pipes, HWDP is typically made of alloy steel that meets specific chemical composition, mechanical properties, and heat treatment criteria to ensure strength, toughness, and resistance to harsh drilling conditions.
Dimensions and Tolerances:
The specification provides detailed requirements for the dimensions and tolerances of Heavy Weight Drill Pipe. This includes specifications for outside diameter, wall thickness, upset dimensions, and other critical dimensions. Tight tolerances are crucial for maintaining the integrity and performance of the HWDP.
Thread Connections:
API 7-1 outlines standards for thread connections on Heavy Weight Drill Pipe. This includes specifications for thread dimensions, taper, and pitch. The threaded connections must be designed to withstand high torque, axial loads, and dynamic forces encountered during drilling operations. API threading classifications, such as API Regular, API Internal Flush (IF), and API Full Hole (FH), are commonly used.
Upsetting and Heat Treatment:
Similar to drill pipes, Heavy Weight Drill Pipe often undergoes upsetting, a process that increases the wall thickness at the ends to provide additional strength. API 7-1 specifies the dimensions and requirements for upsetting. Heat treatment processes are also outlined to achieve the desired material properties.
Inspection and Testing:
The specification includes provisions for inspection and testing of Heavy Weight Drill Pipe. This involves visual inspection, dimensional checks, and various non-destructive testing methods, such as ultrasonic and electromagnetic inspection, to ensure the integrity of the pipe.
Identification and Marking:
Each Heavy Weight Drill Pipe is required to be clearly marked with information such as the manufacturer's name or trademark, size, weight, grade, and other relevant details. This marking helps in traceability and identification of the pipe's specifications.
Quality Control:
Manufacturers are required to implement quality control measures throughout the manufacturing process, and documentation of materials used, inspection results, and compliance with the specified requirements is essential for traceability and quality assurance.
API Monogram:
Manufacturers that comply with API 7-1 and pass the necessary audits have the option to apply for an API Monogram. The API Monogram is a mark of quality and compliance with API standards, providing additional assurance to end-users.
Protective Coatings:
Heavy Weight Drill Pipe may be provided with protective coatings to enhance corrosion resistance and prevent damage during handling and transportation. These coatings must meet the specified requirements of API 7-1.
Handling and Storage:
API 7-1 provides guidelines for the proper handling, storage, and transportation of Heavy Weight Drill Pipe to prevent damage and ensure that the pipes maintain their integrity from the manufacturing facility to the drilling site.
Sizes:
| Size | Tube | Tool Joint | Min Drift Dia. | ||||||||
| Tube ID | Center Upset Dia. |
Upset Length |
Max Elevator Upset |
Connection Number |
Tool Joint OD | Tool Joint ID | Pin Length | Box Length | |||
| A | B | C | D | E | G | F | I | H | |||
| in | mm | in | in | in | in | in | in | in | in | ||
| 3 1/2 | 88.9 | 2 1/4 | 4 | 25 | 3 7/8 | NC38 | 4 3/4 (4 7/8) (5) |
2 1/4 | 27 | 21 | 2 |
| 2 1/16 | 2 1/16 | 1 13/16 | |||||||||
| 4 | 101.6 | 2 1/2 | 4 1/2 | 25 | 4 3/16 | NC40 | 5 1/4 | 2 1/2 | 27 | 21 | 2 1/4 |
| 2 9/16 | 2 9/16 | 2 5/16 | |||||||||
| 4 1/2 | 114.3 | 2 11/16 | 5 | 25 | 4 11/16 | NC46 | 6 1/4 | 2 11/16 | 27 | 21 | 2 7/16 |
| 2 3/4 | 2 3/4 | 2 1/2 | |||||||||
| 2 13/16 | 2 13/16 | 2 9/16 | |||||||||
| 5 | 127.0 | 3 | 5 1/2 | 25 | 5 1/8 | NC50 | 6 5/8 | 3 | 27 | 21 | 2 3/4 |
| 5 1/2 | 139.7 | 3 1/4 | 6 | 25 | 5 11/16 | 5 1/2FH | 7 (7 1/4) (7 1/2) |
3 1/4 | 27 | 21 | 3 |
| 3 3/8 | 3 3/8 | 3 1/8 | |||||||||
| 3 7/8 | 3 7/8 | 3 5/8 | |||||||||
| 4 | 4 | 3 3/4 | |||||||||
| 5 7/8 | 149.2 | 4 | 6 3/8 | 25 | 6 | 5 1/2FH | 7 | 4 | 27 | 21 | 3 3/4 |
| 6 5/8 | 168.3 | 4 | 7 1/8 | 25 | 6 15/16 | 6 5/8FH | 8 (8 1/4) (8 1/2) |
4 | 27 | 21 | 3 3/4 |
| 4 1/2 | 4 1/2 | 4 1/4 | |||||||||
| 5 | 5 | 4 3/4 | |||||||||
Heavy Weight Drill Pipe :
| Size(in) | O.D. (in) | I.D. (in) | Tool Joint O.D. (in) | Tool Joint I.D. (in) | Connection | Max.elevator diameter (in) | Central upset dia. (in) | Min.drift dia.size (in) |
|---|---|---|---|---|---|---|---|---|
| 3 1/2 | 3 1/2 | 2 1/4 | 4 3/4 (4 7/8,5) |
2 1/4 | NC38 | 3 7/8 | 4 | 2 |
| 2 1/16 | 2 1/16 | 1 13/16 | ||||||
| 4 | 4 | 2 1/2 | 5 1/4 | 2 1/2 | NC40 | 4 3/16 | 4 1/2 | 2 1/4 |
| 2 9/16 | 2 9/16 | 2 5/16 | ||||||
| 4 1/2 | 4 1/2 | 2 11/16 | 6 1/4 | 2 11/16 | NC46 | 4 11/16 | 5 | 2 7/16 |
| 2 3/4 | 2 3/4 | 2 1/2 | ||||||
| 2 13/16 | 2 13/16 | 2 9/16 | ||||||
| 5 | 5 | 3 | 6 5/8 | 3 | NC50 | 5 1/8 | 5 1/2 | 2 3/4 |
| 5 1/2 | 5 1/2 | 3 1/4 | 7 (7 1/4, 7 1/2) |
3 1/4 | 5 1/2FH | 5 11/16 | 6 | 3 |
| 3 3/8 | 3 3/8 | 3 1/8 | ||||||
| 3 7/8 | 3 7/8 | 3 5/8 | ||||||
| 4 | 4 | 3 3/4 | ||||||
| 6 5/8 | 6 5/8 | 4 | 8 (8 1/4 ,8 1/2) |
4 | 6 5/8 FH | 6 15/16 | 7 1/8 | 3 3/4 |
| 4 1/2 | 4 1/2 | 4 1/4 | ||||||
| 5 | 4 3/4 |
For any inquiries or information requests, we invite you to contact us directly HERE info@dostfze.com
Important Note:
Information given in this data sheet about the condition or usability of materials respectively products are no warranty for their properties, but act as a description. The information we give on for advice, comply to the experiences of the manufacturer as well as our own. We cannot give a warranty for the results of processing and application of the products.