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Oil country tubular goods or as also known as OCTG pipe are a family of seamless rolled products. These products consist of a drill pipe, as well as octg tubing and casing all of which have been subjected to loading conditions depending on their specific application.
The octg casing lines a borehole. This casing is subject to axial tension by its dead weight, in addition to the internal pressure by fluid purging, as well as the external pressure applied by the surrounding rock formations. The casing is particularly exposed to axial tension and the internal pressure occurred by the pumping of oil or gas emulsion. On the other hand, an octg tube is essentially is a pipe through which the media such as oil or gas is conveyed from the wellbore. Segments of the octg tubing are generally around 30 ft or 9 m in length with a threaded connection on each end.
An octg drill pipe is a heavy seamless tube which has the ability to rotate the drill bit while it circulates drilling fluid. Pipe segments 30 ft in length are frequently coupled with tool joints. A Threaded Drill Pipe is simultaneously subjected to axial tension by its dead weight, high torque by drilling, as well as internal pressure when drilling fluid has been purged. Additionally, changing the bending loads in a sequence due to non-vertical or deflected drilling could be superimposed on these basic loading patterns.
What mean by Oil Country Tubular Goods?
The term Oil Country Tubular Goods describes tubes that are used in oil and gas production: As a rule these include drill pipe, casing and tubing
material specification standard of octg pipe
Product: Casing Pipe, Oil Casing, API Casing, Well Casing, Casing Application: Used for oil casing and tubing in oil wells as well as sidewall Size: OD: 114.3mm-508mm WT: 5-16mm LENGTH: R1, R2, R3 Pipe Standard: API 5CT PSL1/PSL2 J55,K55,N80-1,N80-Q, API 5CT PSL1/PSL2 L80-1, L80-9Cr,L80-13Cr,C90, C95, P110, Q125 Thread: NUE, EUE, VAM, STC, LTC, BTC, XC, VAM TOP, NEW VAM,HYDRILL CS Special Service Sweet Service, Sour Service, Anti-H2S, NACE MR/ISO Type of threading of the pipe: STC, LTC, BTC, WSP-1T Tubing Pipe length: R3 10.36-12.20 (34-40) Accessories: Pup Joint, Coupling, Drill Collar, Crossover etc.
OCTG API Tubing
Product: Tubing Pipe, Oil Tubing, API Tubing Well Tubing, Tubing Application: Used for extracing Oil or Gas from Wells Size: OD: 48.26mm-114.3mm WT: 3.18-16mm LENGTH: R1, R2, R3 Pipe Standard: API 5CT PSL1/PSL2 J55,K55,N80-1,N80-Q, API 5CT PSL1/PSL2 L80-1, L80-9Cr,L80-13Cr,C90, C95, P110, Q125 Thread: NUE, EUE, VAM, STC, LTC, BTC, XC, VAM TOP, NEW VAM,HYDRILL CS Special Service Sweet Service, Sour Service, Anti-H2S, NACE MR/ISO Accessories: Pup Joint, Coupling, Drill Collar, Crossover etc.
OCTG Casing Pipe
Product: Casing Pipe, Oil Casing, API Casing, Well Casing, Casing Application: Used for oil casing and tubing in oil wells as well as sidewall Size: OD: 114.3mm-508mm WT: 5-16mm LENGTH: R1, R2, R3 Pipe Standard: API 5CT PSL1/PSL2 J55,K55,N80-1,N80-Q, API 5CT PSL1/PSL2 L80-1, L80-9Cr,L80-13Cr,C90, C95, P110, Q125 Thread: NUE, EUE, VAM, STC, LTC, BTC, XC, VAM TOP, NEW VAM,HYDRILL CS Special Service Sweet Service, Sour Service, Anti-H2S, NACE MR/ISO Accessories: Pup Joint, Coupling, Drill Collar, Crossover etc.
OCTG Tubing And Casing Coupling
Product: Casing and Tubing Coupling, Casing Coupling, Tubing Coupling Application: Used for connect 2 joints of tubing or casing Size: Tubing Coupling : 1.9'' - 4-1/2'' Casing Couping : 4-1/2'' - 13-3/8'' Pipe Standard: API 5CT and 5B PSL1/PSL2 J55,K55,N80-1,N80-Q, API 5CT and 5B L80-1,C90, C95,T95, P110, Q125 Surface: Whole Phosphating or inside phosphating and outside coating Thread: NUE, EUE, VAM, STC, LTC, BTC, XC, VAM TOP, NEW VAM,HYDRILL CS Special Service Sweet Service, Sour Service, Anti-H2S, NACE MR/ISO Packing: By carton, wooden case, wooden pallet or requirement of customer
OCTG Pup Joint
Product: Pup Joint, OCTG Pup Point Application: Pipe Cut into length used for connect 2 joints of tubing or casing Size: Tubing Coupling : 2-3/8'' - 4-1/2'' Casing Couping : 4-1/2'' - 20' Length: 2, 3, 4, 6, 8, 10, 12 ft Pipe Standard: API 5CT and 5B J55,K55,N80-1,N80-Q,P110, C95 Surface: Coating Thread: BTC, LTC, STC Special Service Sweet Service, Sour Service, Anti-H2S, NACE MR/ISO Packing: By carton, wooden case, wooden pallet or requirement of customer
Types Of Octg pipe
OCTG casing pipe
OCTG casing pipe are a key structural component for an oil & gas well and have the following scope:
The six basic types of casing strings are:
Dimensions and Materials
Casing pipe are available in a diameter range 4 1/2 to 20 inches, and in the following materials: H-40, J-55, K-55, N-80, L-80/C, 90/T, 95, P110, Q-125 as discussed in more detail below.
End Connection Types
The main types of connections for casing pipe are STC (short threads), LTC (long threads), BTC (buttress threads) and premium gas-tight connections.
Octg Tubing pipe
Sizes and Materials
Tubing pipe are manufactured in seamless and welded execution, in the size range of 1.050 to 5 1/2 inches
End Connections
The main types of connections for tubing pipe are NUE (non-upset), EUE (external upset) and premium. Corrosion resistance under sour service conditions is a very important OCTG characteristic, especially for casing and tubing.
OCTG Drill pipe
Drill pipe is a heavy, seamless tube that rotates the drill bit and circulates drilling fluid. It allows the drilling fluid to be pumped through the bit and back up the annulus. Drill Pipe normally mean for the Durable steel pipe used in drilling, standards in API 5DP and API SPEC 7-1.
Product: Drill Pipe Application: Used for Mine, water well drilling, well drilling, coal and fore poling Size: OD: 60.32mm-168.28mm WT: 6.45-12.7mm LENGTH: R1, R2, R3 Pipe Standard: API 5DP E75, X95, G105, S135 Upset Style: IU, EU, IEU Connection: NC26 - NC50, 5 1/2FH, 6 5/8FH Internal coating TK34,TC, Arnco 100XT, 200XT, 300XT
Tubing drill pipe ensure thread connections of various kinds including the following categories,
Price list of octg seamless pipe
Steel Casing Pipe cost is lower than drill pipe or the OCTG tubing cost, it is usually higher 200 USD than the regular API 5L pipe. Considering the Threading + Coupling cost or the heating treatment.
Octg Pipe Manufacturing Process
The manufacturing processes of casing and tubing pipe include:
These processes typically do not allow the thermo-mechanical processing customary for the strip and plate products used for welded pipe.
Basic types of octg line pipe
Octg Casing Pipe
Octg Tubing
Octg Drill Pipe
Octg Seamless Pipe
Octg Casing Pipe Dimensions
Note: P = plain end, S = short round thread, L = long round thread, B = buttress thread. Sizes per API 5CT specification
OCTG Casing
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Octg Tubing Pipe dimensions
Note: P = plain end, N = Non-upset thread and coupling, U = upset thread and coupling. Sizes per API 5CT specification
Api 5ct Tolerances
Execution Outer Diameter Wall Thickness Cold rolled Tube sizes(mm) Tolerances(mm) 114.3 ±0.79 12.5 114.3 0.51
Octg Pipe Materials/ Octg Casing Pipe Standard/ Octg Tubing Grades
The most common materials for OCTG pipe are API H40, J55, K55, L80, N80, P110, and Q125 (casing and tubing pipe). These API grades feature increasing mechanical properties (tensile and yield strength).
The standards above govern the characteristics of OCTG when it comes to
OCTG casing and tubing pipe are available in the following material grades:
API H40
API H40 grade is for general purpose OCTG pipe material with the following mechanical properties:
Chemical Formula of API H40
C Mn Mo Cr Ni Cu Ti P S Si V Al Min Max 0.030 0.030Mechanical Properties of API H40
Min Tensile Strength 414 MPa 60,000 psi min Min Yield Strength 276 MPa 552 MPa max 40,000 psi 80,000 psi max Total Elongation Under Load 0.500 %
API J55
The J55 API-5CT casing pipe is a comparatively low steel grade in oil drilling. It is widely applied to shallow oil and gas extraction.The J55 API-5CT casing pipe is a comparatively low steel grade in oil drilling. It is widely applied to shallow oil and gas extraction.
API J55 Chemical Element
C Mn Mo Cr Ni Cu Ti P S Si V Al Min Max 0.030 0.030
API J55 Mechanical Characteristics
Min Tensile Strength 517 MPa 75,000 psi min Min Yield Strength 379 MPa 552 MPa max 55,000 psi 80,000 psi max Total Elongation Under Load 0.500 %
API L80
L80 belongs to steel grades group of the corrosion-resistant casing. L80 API oilfield casing pipe includes L80-1, L80-9Cr, and L80-13Cr. L80-1 is used in the H2S environment, while L80-9Cr and L80-13Cr are used in the CO2 environment.
Composition Standard of API L80
C Mn Mo Cr Ni Cu Ti P S Si V Al Min Max 0.430 1.900 0.250 0.350 0.030 0.030 0.450
Mechanical Strength Table API L80
Min Tensile Strength 655 MPa 95,000 psi min Min Yield Strength 552 MPa 655 MPa max 80,000 psi 95,000 psi max Total Elongation Under Load 0.500 % Hardness 23 Max HRC 241 Max HBW
Chemical Compatibility of 9Cr-L80
C Mn Mo Cr Ni Cu Ti P S Si V Al Min 0.300 0.900 8.000
Mechanical Behaviour of 9Cr-L80
Min Tensile Strength 655 MPa 95,000 psi min Min Yield Strength 552 MPa 655 MPa max 80,000 psi 95,000 psi max Total Elongation Under Load 0.500 % Hardness 23 Max HRC 241 Max HBW
API N80
API-5CT N80 oilfield casing pipe contains N80-1 and N80-Q types. Those two materials are absolutely consistent regarding the chemical composition and mechanical attributes, they are just variations in the heat treatment.API-5CT N80 oilfield casing pipe contains N80-1 and N80-Q types. Those two materials are absolutely consistent regarding the chemical composition and mechanical attributes, they are just variations in the heat treatment.
Composition chart Of API N80
C Mn Mo Cr Ni Cu Ti P S Si V Al Min Max 0.030 0.030
Mechanical Analysis Of API N80
Min Tensile Strength 689 MPa 100,000 psi min Min Yield Strength 552 MPa 758 MPa max 80,000 psi 110,000 psi max Total Elongation Under Load 0.500 % Hardness
API P110
The P110 API-5CT steel casing pipe is the high grade amongst other grades of steel. The white band is marked on the finished casing to point out the materials.
API Q125
This API grade is generally used for deep wellbore service and not in sour condensate wells.
Premium Connections of OCTG
The Premium Connection Series is a special range of casing tubing accessories that are manufactured and marketed by the Oil Country Tubular Goods Supply.The Premium Connection Series is a special range of casing tubing accessories that are manufactured and marketed by the Oil Country Tubular Goods Supply.
octg steel pipe Chemical Composition
Group OCTG pipe materials Type C Mn Mo Cr Ni max. Cu max. P max. S max. Si max. min. max. min. max. min. max. min. max. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 161
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
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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.
octg seamless pipe Mechanical Properties
Group OCTG pipe materials Type Total elongation under load % Yield strength MPa Tensile strength min. MPa Hardness a max. Specified wall thickness mm Allowable hardness variation b HRC min. max . HRC HBW 1 2 3 4 5 6 7 8 9 10 11 1H40
0.5
276
552
414
J55
0.5
379
552
517
K55
0.5
379
552
655
N80
1
0.5
552
758
689
N80
Q
0.5
552
758
689
R95
0.5
655
758
724
2M65
0.5
448
586
586
22
235
L80
1
0.5
552
655
655
23
241
L80
9Cr
0.5
552
655
655
23
241
L80
13Cr
0.5
552
655
655
23
241
C90
1
0.5
621
724
689
25.4
255
12.70 12.71 to 19.04 19.05 to 25.39 25.40
3.0 4.0 5.0 6.0
T95
1
0.5
655
758
724
25.4
255
12.70 12.71 to 19.04 19.05 to 25.39 25.40
3.0 4.0 5.0 6.0
C110
0.7
758
828
793
30
286
12.70 12.71 to 19.04 19.05 to 25.39. 25.40
3.0 4.0 5.0 6.0
3P110
0.6
758
965
862
4Q125
1
0.65
862
931
b
12.70 12.71 to 19.04 19.05
3.0 4.0 5.0
a In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method.
Features for octg line pipe
All OCTG pipe have a standard requirement of dependable hardness. So whether it is OCTG tubing, OCTG pipe or OCTG drill pipe, there is a certain required standard which is always about super hardness. To meet the standard, manganese and chromium are used as the main alloys to confirm the cohesion and durability.
octg tubing and casing Grades & Material Selection
Depending on the application, OCTG products could be of various steel grades and material composition. Both are affected by the following attributes and requirements:
Oil Country Tubular Goods (OCTG pipe) For Sales
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