API 5CT Q125 CASING

Product Introduction

Pipe Process of API 5CT Q125 Casing and Tubing
Round Pipe → pipe inspection → NDT inspection MPI → End Threading → Thread Inspection → Coupling Threading lnspection → NDT inspection MPI ( coupling) → Phosphating (for coupling) → Coupling power Make up → Hydrostatic test → Drift test → Doping and Protectors Application → Coating → Measurement of Length and Weight → Colour Identification → Marking → Packing → Warehousing

What is API 5CT Q125 Casing?
API 5CT Q125 Casing serves to transport both crude oil and natural gas from oil and gas layer to the surface pipeline after drilling is completed. It is able to bear the pressure produced by the exploitation process. After the outer surface is coated with a protective layer, the tubing is marked in accordance with the API 5CT standard and strapped with metal belt.

Our oilfield tubing & API 5CT Q125 Casing can be widely applicable to petroleum, construction, shipbuilding, smelting, aviation, electric power, food, paper, chemical industry, medical equipment, boilers, heat exchangers, metallurgy and so on.This oilfield tubing can be classified as NUE type and EUE type. You can find here Casing Dimensions & Casing Wall Thickness.

API 5CT Q125 Casing:
Q125 Casing is placed downhole to provide structural integrity to the wellbore and must withstand external-collapse pressure from rock formations and internal-yield pressure from fluid and gas. It must also hold its own deadweight and withstand the torque and transaxial pressure placed on it while running downhole.

API 5CT Q125 Tubing:
Q125 Tubing is placed within the casing. It is used to transport oil and gas from the source rock to the wellhead

Technical data

API 5CT Q125 Casing Specification

Casing Pipe Specifications
Standards:	API SPEC 5CT
Model in Common Use:	2-3/8", 2-7/8", 3-1/2", 4", 4-1/2"
Length Range:	R1(6.10-7.32m), R2(8.53-9.75m), R3(11.58-12.8m)
Steel Grade (Casing Grades, Tubing Grades):	J55, K55, N80-1, N80-Q, L80, P110
Type of Screw Thread:	Non upset threaded end(NUE), External upset threaded end(EUE)
Specialties	Threading Heat treating External upset Drifting (Full-length, or just ends) Hydrostatic Testing Full third-party inspection capabilities (EMI, SEA, and Weld Line) Couplings – EUE, AB Modified, turned down, special clearance couplings Coating to customer specifications Pup Joints

API 5CT Q125 Casing Chemical Composition, mass fraction (%)

Group	Grade	Type	C		Mn		Mo		Cr		Ni max.	Cu max.	P max.	S max.	Si max.
Group	Grade	Type	min.	max.	min.	max.	min.	max.	min.	max.	Ni max.	Cu max.	P max.	S max.	Si max.
1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16
1	H40	-	-	-	-	-	-	-	-	-	-	-	0.03	0.03	-
	J55	-	-	-	-	-	-	-	-	-	-	-	0.03	0.03	-
	K55	-	-	-	-	-	-	-	-	-	-	-	0.03	0.03	-
	N80	1	-	-	-	-	-	-	-	-	-	-	0.03	0.03	-
	N80	Q	-	-	-	-	-	-	-	-	-	-	0.03	0.03	-
	R95	-	-	0.45 c	-	1.9	-	-	-	-	-	-	0.03	0.03	0.45
2	M65	-	-	-	-	-	-	-	-	-	-	-	0.03	0.03	-
	L80	1	-	0.43 a	-	1.9	-	-	-	-	0.25	0.35	0.03	0.03	0.45
	L80	9Cr	-	0.15	0.3	0.6	0.9	1.1	8	10	0.5	0.25	0.02	0.01	1
	L80	13Cr	0.15	0.22	0.25	1	-	-	12	14	0.5	0.25	0.02	0.01	1
	C90	1	-	0.35	-	1.2	0.25 b	0.85	-	1.5	0.99	-	0.02	0.01	-
	T95	1	-	0.35	-	1.2	0.25 d	0.85	0.4	1.5	0.99	-	0.02	0.01	-
	C110	-	-	0.35	-	1.2	0.25	1	0.4	1.5	0.99	-	0.02	0.005	-
3	P110	e	-	-	-	-	-	-	-	-	-	-	0.030 e	0.030 e	-
4	Q125	1	-	0.35		1.35	-	0.85	-	1.5	0.99	-	0.02	0.01	-
a The carbon content for L80 may be increased up to 0.50 % maximum if the product is oil-quenched. b The molybdenum content for Grade C90 Type 1 has no minimum tolerance if the wall thickness is less than 17.78 mm. c The carbon content for R95 may be increased up to 0.55 % maximum if the product is oil-quenched. d The molybdenum content for T95 Type 1 may be decreased to 0.15 % minimum if the wall thickness is less than 17.78 mm. e For EW Grade P110, the phosphorus content shall be 0.020 % maximum and the sulfur content 0.010 % maximum. NL = no limit. Elements shown shall be reported in product analysis.

API 5CT Q125 Casing Mechanical Properties

Standard	Type	Tensile Strength MPa	Yield Strength MPa	Hardness Max.
API SPEC 5CT	J55	≥517	379 ~ 552	----
	K55	≥517	≥655	---
	N80	≥689	552 ~ 758	---
	L80(13Cr)	≥655	552 ~ 655	≤241HB
	P110	≥862	758 ~ 965	----

API 5CT Q125 Casing 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 Features

API 5CT Q125 Casing is offered with a free length range from 8 to 13m on basis of the SY/T6194-96 norm. However, it is also available no less than 6m length and its quantity should be no more than 20%.
Any deformation such as crease, hairline, separation, crack or scab is not acceptable on both inner and outer surfaces of the product. All these defects should be completely removed, and the removed depth must not exceed 12.5% of nominal wall thickness.
Deformations which mentioned above are not allowed to appear on the outer surface of API 5CT Q125 Casing coupling.
The surface of thread of coupling and API 5CT Q125 Casing should be smooth without any burr, tear or other defects that may have a negative impact on the strength and close connection.