Oilfield Non-magnetic Drill Collar
The non-magnetic products of Zhongzhong mainly include non-magnetic drill collar, non-magnetic stabilizer, non-magnetic heavy weight drill pipe etc.
It is made from high-class low carbon stainless steel, and completely meets the requirement of API Spec 7-1 and SY/T5144 Standard. It has good low magnetic permeability, high mechanical property and perfect enduring intergranular corrosion cracking performance. It is mainly used for the inspection in the process of petroleum drilling, and the structure is the same with the ordinary drill collar.
Magnetic permeability(MPS=1×105/4∏A/m)
1. Average: Ur<1.010
2. Magnetic Field Gradient: ΔB≤0.05μT
Specification:
|
Connections
|
OD
mm
|
ID
mm
|
Length
mm
|
|
|
NC23-31
|
79.4
|
31.8
|
9150
|
|
|
NC26-35
|
88.9
|
38.1
|
9150
|
|
|
NC31-41
|
104.8
|
50.8
|
9150 or 9450
|
|
|
NC35-47
|
120.7
|
50.8
|
915 or 9450
|
|
|
NC38-50
|
127.0
|
57.2
|
9150 or 9450
|
|
|
NC44-60
|
152.4
|
57.2
|
9150 or 9450
|
|
|
NC44-60
|
152.4
|
71.4
|
9150 or 9450
|
|
|
NC44-62
|
158.8
|
57.2
|
9150 or 9450
|
|
|
NC46-62
|
158.8
|
71.4
|
9150 or 9450
|
|
|
NC46-65
|
165.1
|
57.2
|
9150 or 9450
|
|
|
NC46-65
|
165.1
|
71.4
|
9150 or 9450
|
|
|
NC46-67
|
171.4
|
57.2
|
9150 or 9450
|
|
|
NC50-67
|
171.4
|
71.4
|
9150 or 9450
|
|
|
NC50-70
|
177.8
|
57.2
|
9150 or 9450
|
|
|
NC50-70
|
177.8
|
71.4
|
9150 or 9450
|
|
|
NC50-72
|
184.2
|
71.4
|
9150 or 9450
|
|
|
NC56-77
|
196.8
|
71.4
|
9150 or 9450
|
|
|
NC56-80
|
203.2
|
71.4
|
9150 or 9450
|
|
|
6 5/8REG
|
209.6
|
71.4
|
9150 or 9450
|
|
|
NC61-90
|
228.6
|
71.4
|
9150 or 9450
|
|
|
7 5/8REG
|
241.3
|
76.2
|
9150 or 9450
|
|
|
NC70-97
|
247.6
|
76.2
|
9150 or 9450
|
|
|
NC70-100
|
254.0
|
76.2
|
9150 or 9450
|
|
|
8 5/8REG
|
279.4
|
76.2
|
9150 or 9450
|
|
Mechanical properties:
|
OD
|
Yield Strength σ0.2
MPa
|
Tensile Strength
σb
MPa
|
Elongation
δ4
%
|
|
|
mm
|
in
|
|||
|
79.4-171.4
|
3 1/8-6 3/4
|
≥758
|
≥827
|
≥18
|
|
177.8-279.4
|
7-11
|
≥689
|
≥758
|
≥20
|