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Drill Pipe

Drill Pipe

Products: Drill Pipe, Heavy Weight Drill Pipe


Size: 2-3/8"--6-5/8"

Standard: API 5DP

Grade: E75, X95, G105, S135, SS-105
Length: Range 1, Range 2 or 3


Upset of Drill Pipe

Internal Upset    IU
External Upset   EU

Internal-External Upset   IEU

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  • Process
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Products: Drill Pipe, Heavy Weight Drill Pipe, Drill Collar

Size: 2-3/8"--6-5/8"

Standard: API 5DP

Grade: E75, X95, G105, S135, SS-105
Length: Range 1, Range 2 or 3


Upset of Drill Pipe

Internal Upset    IU
External Upset   EU

Internal-External Upset   IEU


Friction welded Tool Joints
Numbered Connections    NC
Internal Flush    IF
Full Hole    FH



Mechanical properties of API drill pipe grades

Grade
Yield strength
Tensile strength
API
psi
N/mm2
min.
psi
N/mm2
max.
psi
N/mm2
min.
E
75 000
515
105 000
725
100 000
690
Spec. 5 DP

X
95 000
655
125 000
860
105 000
725
Spec. 5 DP

G
105 000
725
135 000
930
115 000
795
Spec. 5 DP

S
135 000
930
165 000
1 140
145 000
1 000
Spec. 5 DP

 Mechanical properties of API tool joint grades

Yield strength
Yield strength
Tensile strength
Elongation
Box
psi
N/mm2
min.
psi
N/mm2
max
psi
N/mm2
min
in 2 inches
%
min
Hardness
Brinell
min
120 000
827
165 000
1138
140 000
965
13 285

Chemical composition requirements

Pipe body
Phosphorus
max. %
Sulfur
max. %
Pipe body grade E
0.030
0.020
Pipe body grades X, G and S
0.020
0.015
Tool joint
0.020
0.015


Details of manufacturing

Tool joints are inertia welded to the tubes with computer-monitored precision. Concentricity is carefully monitored and controlled, and the parameters of each weld are electronically recorded, and traceable to each joint.

                                                                                                              



After removal of weld flash, the weld area is austenitized, quenched, and tempered to achieve the required mechanical properties. Heat treat cycles for each weld are compared to specific parameters and recorded for traceability.

                                                                                                              


After all steps and machine marks are polished from the OD and ID area, hardness testing, ultrasonic testing, and wet magnetic particle inspections are used to verify the integrity of each weld zone.

                                                                                                              


Drill Pipe Dimensional Range and Performance Properties

Thedrill pipeis a steel pipe with threads at the end, which is used to connect the surface equipment of the drilling rig and the drilling and grinding equipment or the bottom hole device at the bottom of the drilling well. The purpose of the drill pipe is to transport the drilling mud to the drill bit and together with the drill bit to raise, lower or rotate the bottom hole device. Drill pipe must be able to withstand enormous internal and external pressure, twisting, bending and vibration. In the process of oil and gas extraction and refining, the drill pipe can be used many times.


The length of the drill pipe is generally about nine meters, and it is divided into three categories: kelly, drill pipe and weighted drill pipe. The connection sequence is kelly (1 piece) + drill pipe (n pieces, determined by the well depth) + heavy drill pipe (n pieces, determined by the design of the drilling tool assembly).

Plain and raw steel pipe is made into drill pipe after several processing steps. First, through the steel pipe thickening process, the outer surface of the bare pipe is bent inward, and the steel pipe wall is thickened. Next, it is threaded and plated with copper for added strength. Non-destructive quality control inspections are then performed, followed by welding of the steel pipe body joints. Then, the pipe will undergo welding heat treatment and welding final treatment to eliminate welding residual stress. Before the finished drill pipe is painted and packaged, other tests are carried out on the finished steel pipe, including hardness test, pressure test and non-destructive test.

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