Drill Pipe And Drill Collar

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Drill Pipe

Size: OD: 60.32mm-168.28mm.

WT: 6.45-12.7mm.

Length: R1, R2, R3.

Grades: E75, X95, G105, S135.

Connection threads: NC26, NC31, NC38, NC46, NC50, 5 1/2FH, 6 5/8FH.

Standard: API 5DP.

Upset Style: EU, IEU.

Uses: Drill pipe is for exploration and development of oil and gas wells.

Drill Collars

Size: OD: 3 1/8"-11".

Length: 30Ft / 31Ft / 43Ft / R1~R3.

Standard: API 5DP/API Spec 7-1 E75,X95,G105,S135.

Connection Type: NC, REG, FH, IF.

Thread: NC31, NC35, NC38, NC46, NC50, 6 5/8 REG, 7 5/8 REG, NC70, NC77.

Material: 4145H.

Uses: As an important part of drill string, drill collar can supply the drill bit and increase the rigidity of drill string. Classification: Non Magnetic Drill Collar, Slick Drill Collar, Spiral Drill Collar,Square Drill Collars and etc.

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Drill Pipe Chemical composition requirements
Pipe body Phosphorus max. % Sulfur max. %
0.030 0.020
0.020 0.015
Tool joint 0.020 0.015
Drill Pipe
Chemical Composition		 steel grade P (%) S (%)
≤ ≤
Pipe body E 0.030 0.020
X, G, S 0.020 0.015
Tool Joint 0.020 0.015
Drill collar Mechanical Performance
OD Yield Strength Tensile Strength Elongation Reduction of area Impact
Size σ0.2 Mpa(psi) δ4% % Ft.1b
Mpa(psi)
3 1/8~6 3/4 ≥758 ≥827 ≥18 50 ≥50
-110,000 -120,000
7~10 ≥689 ≥758 ≥20
-100,000 -110,000
Steel Mark Drill collar Chemical Composition %
C Si Mn P S Cr Mo Cu Al
4145H 0.42 ~ 0.48 0.15 ~ 0.35 0.90 ~ 1.20 ≤0.03 ≤0.03 0.90 ~ 1.20 0.15 ~ 0.25 ≤0.2 0.025 ~ 0.045
Other Elements: N≤0.015, Ni≤0.5