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Q125 indicates that the steel casing has a minimum yield strength of 125,000 psi (862 MPa). Q125 casing is a high-strength casing material suitable for harsh oil and gas exploration and production environments.
API 5CT Q125 oil casing is designed for use as casing and tubing in oil and gas wells. Casing is used to support the borehole wall, protect the wellbore from external pressures, and prevent fluid migration. Tubing is used to extract oil and gas from wells. Q125carbon steel casing pipe can be manufactured by seamless or resistance welding (ERW) process. In the oil and gas industry, seamless casing is commonly used in critical applications.
API 5CT Q125 casing in borewell may undergo a heat treatment process to achieve required mechanical properties and improve its performance under specific downhole conditions.
The specifications and models of Q125 oil casing are determined according to relevant standards. The diameters are usually 600mm, 700mm, 800mm, 900mm, 1000mm, 1100mm, 1200mm and other specifications. Among them, the specifications and models with diameters of 600mm and 700mm are the most commonly used.
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Q125 Casing Tubing Dimensions
| Pipe Casing Sizes, Oilfield Casing Sizes & Casing Drift Sizes | |
|---|---|
| Outer Diameter (Casing Pipe Sizes) | 4 1/2"-20", (114.3-508mm) |
| Standard Casing Sizes | 4 1/2"-20", (114.3-508mm) |
| Thread Type | Buttress thread casing, Long round thread casing, Short round thread casing |
| Function | It can protect the tubing pipe. |
API 5CT Q125 Tubing Mechanical Properties
| Tensile Strength | 931 MPa min | 135,000 psi min |
| Yield Strength | 862 MPa min | 1,034 MPa max |
| 125,000 psi min | 150,000 psi max | |
| Total Elongation Under Load | 0.650 % | - |
| Hardness | - | - |
API 5CT Grade Q125 Casing Tubing Steel Color Code
| Name | J55 | K55 | N80-1 | N80-Q | L80-1 | P110 |
|---|---|---|---|---|---|---|
| Casing | a bright green band | two bright green bands | a bright red band | a bright red band + a green band | a red band + a brown band | a bright white band |
| Coupling | entire green coupling + a white band | entire green coupling | entire red coupling | entire red coupling + a green band | entire red coupling + a brown band | entire white coupling |
API 5CT Q125 Casing Tubing
Size：1/4" to 24" Outside Diameter 13.7 mm to 610 mm;
Wall thickness：SCH10, SCH20, SCH30, SCH40, SCH60, STD, SCH80, SCH100 XS, SCH120, SCH160, XXS;
Length：R1 (6.10-7.32m), R2 (8.53-9.75m), R3 (11.58-12.80m)
Tolerance: OD＜114.3mm, tolerance ±0.79; OD≥114.3mm, tolerance -0.5% +1%
Thickness tolerance:-12.5%
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