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Spec. OD of outer pipe& ID of inner pipe: 114*76mm
Grade of Steel :N80Q
OD of outer pipe & wall thickness: 114.3*6.88mm
OD of inner pipe & wall thickness: 88.9*6.45mm
OD of Coupling : 132mm
Coupling Thread: 4-1/2BC
Thermal Conductivity: 0.002~0.08 W/m· ?
Tensile Strenth at Normal Temperature:537 kN.
Flatness : <= 0.2%
Well Depth : <= 1500m
Inner pressure resistance :
normal : 32MPa
injected : 20MPa
Outer pressure resistance :
normal:26MPa
injected:24MPa.
The cementing of casing :7inch