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Eastern Steel Manufacturing Co.,Ltd is a leading manufacturer and distributor of seamless steel pipe, welded steel pipe, OCTG products and fittings. We supply first-step processing, semi-finished parts and finished parts to help our clients meet fabrication requirements beyond their capacity or to improve operations by moving forward the pre-production processing.
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Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
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Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
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Many years of large-scale project experience in various fields（Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical etc.）, professional project team is responsible from receiving until the end of the project.
Heavy weight drill pipe is an indispensable tool in oil and gas drilling. Its function is to transmit rotational power and impact force to the drill bit, and at the same time transmit drilling fluid from the drilling fluid to the bottom of the well. Heavy weight drill pipe is generally composed of steel pipe, joint and spiral, usually made of high-quality seamless steel pipe or carbon steel pipe. Its main parameters include diameter, length, torque, bending strength, tensile strength, etc.
Mechanical properties of heavy-weight drill pipe
The mechanical properties of some heavy-weight drill pipes are as follows:
|
Item |
3‑1/2" 26# mm |
3‑1/2" 26# in |
5" 50# mm |
5" 50# in |
|
Inner diameter |
52.4 |
2‑1/16" |
76.2 |
3" |
|
Wall thickness |
18.20 |
0.719" |
25.4 |
1" |
|
End thickening outer diameter |
92.1 |
3‑5/8" |
130.2 |
5‑1/8" |
|
Middle thickening outer diameter |
101.6 |
4" |
139.7 |
5‑1/2" |
|
Connection form |
3‑1/2" IF |
4‑1/2" IF |
||
|
Tool joint outer diameter |
120.6 |
4‑3/4" |
165.1 |
6‑1/2" |
|
Tool joint inner diameter |
55.6 |
2‑3/16" |
77.8 |
3‑1/16" |
|
Weight of body + joint |
37.7 Kg/m |
25.3 Lb/ft |
73.5 Kg/m |
49.3 Lb/ft |
|
Volume in tube |
2.19 L/m |
0.177 Gal/ft |
4.61 L/m |
0.371 Gal/ft |
|
Displacement in open end |
4.81 L/m |
0.387 Gal/ft |
9.36 L/m |
0.754 Gal/ft |
|
Displacement in closed end |
7.00 L/m |
0.564 Gal/ft |
13.97 L/m |
1.125 Gal/ft |
|
Tensile strength (body) |
153 ×10³ daN |
345 ×10³ lb |
307 ×10³ daN |
691 ×10³ lb |
|
Tensile strength (tool joint) |
333 ×10³ daN |
749 ×10³ lb |
563 ×10³ daN |
1266 ×10³ lb |
|
Torsion strength (tube body) |
2654 m‑daN |
19575 Ft‑lb |
7660 m‑daN |
56495 Ft‑lb |
|
Torsion strength (tool joint) |
2383 m‑daN |
17575 Ft‑lb |
6966 m‑daN |
51375 Ft‑lb |
|
Tightening torque |
1342 m‑daN |
9900 Ft‑lb |
3985 m‑daN |
29400 Ft‑lb |
Specification
The specification list of heavy-weight drill pipe is as follows:
|
Diameter (inch) |
Thread type |
Length (feet) |
|
2 7/8 |
NC26 |
31 |
|
3 1/2 |
NC31 |
31 |
|
4 1/2 |
NC38 |
31 |
|
5 1/2 |
NC44 |
31 |
|
6 5/8 |
NC50 |
31 |
|
7 5/8 |
5 1/2FH |
31 |
|
9 |
6 5/8FH |
31 |
Selecting principles
1. Select the diameter according to the operation requirements.
2. Select the length according to the well depth and operation requirements.
3. Select the pipe material and diameter according to the torque and bending strength requirements.
4. Select the pipe material and diameter according to the tensile strength requirements.
Notes
1. Select the appropriate heavy weight drill pipe according to the actual operation conditions.
2. The heavy weight drill pipe needs to be checked regularly during use to find out whether there are problems such as warping, deformation, and cracks.
3. The correct use and maintenance of the heavy weight drill pipe can extend its life and reduce costs and risks.
Conclusion
As an OCTG pipe, the heavy weight drill pipe is an important tool in oil and gas drilling. Its specifications and models need to be selected according to actual needs. At the same time, special attention should be paid to the maintenance and overhaul of the heavy weight drill pipe to ensure its service life and efficiency.
E-mail: sales@eastern-steels.com
