OCTG pipes

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OCTG pipe

Octg Tubing And Casing

Threaded Drill Pipe

 

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Oil country tubular goods, commonly referred to as OCTG pipe, represent a range of seamless rolled products. This category encompasses drill pipe, along with OCTG tubing and casing, each subjected to specific loading conditions based on their intended application.

The OCTG casing serves to line a borehole, facing axial tension from its own weight, alongside internal pressure from fluid purging, and external pressure exerted by surrounding rock formations. It is notably vulnerable to axial tension and internal pressure from the oil or gas emulsion being pumped. Conversely, an OCTG tube is a pipe that conveys media like oil or gas from the wellbore. Each segment of OCTG tubing typically measures around 30 ft or 9 m in length and possesses threaded connections on both ends.

The OCTG drill pipe is a robust seamless tube capable of rotating the drill bit while circulating drilling fluid. Segments often span 30 ft in length and are coupled with tool joints. A Threaded Drill Pipe experiences axial tension from its own weight, substantial torque during drilling, and internal pressure when drilling fluid is purged. Furthermore, variations in bending loads caused by non-vertical or deflected drilling can add complexity to these loading patterns.

 

Understanding Oil Country Tubular Goods

The term Oil Country Tubular Goods denotes pipes that are crucial in oil and gas extraction, principally including drill pipe, casing, and tubing.

 

Material Specification Standards for OCTG Pipe

Product: Casing Pipe, Oil Casing, API Casing, Well Casing, Casing Application: Suitable for oil casing and tubing in oil wells and sidewalls 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 extracting 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: Utilized for oil casing and tubing in oil wells and sidewalls 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 to connect 2 joints of tubing or casing Size: Tubing Coupling: 1.9'' - 4-1/2'' Casing Coupling: 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 customer requirements

 

OCTG Pup Joint

Product: Pup Joint, OCTG Pup Point Application: Pipe cut to length used to connect 2 joints of tubing or casing Size: Tubing Coupling: 2-3/8'' - 4-1/2'' Casing Coupling: 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 customer requirements

 

Types of OCTG Pipe

 

OCTG Casing Pipe

OCTG casing pipe are a key structural component for an oil & gas well and have the following purposes:

• Maintaining borehole stability
• Preventing bore contamination from water sands
• Discouraging water from producing formations
• Exercising tight control of wellbore pressures during drilling, production, and repair operations

The six basic types of casing strings include:

• Conductor Casing
• Surface Casing
• Intermediate Casing
• Production Casing
• Liner
• Liner Tieback Casing

Dimensions and Materials

Casing pipes are available in a diameter range of 4 1/2 inches to 20 inches and in materials like H-40, J-55, K-55, N-80, L-80/C, 90/T, 95, P110, and Q-125, as further detailed below.

End Connection Types

The primary connection types for casing pipes are STC (short threads), LTC (long threads), BTC (buttress threads), and premium gas-tight connections.

 

OCTG Tubing Pipe

Sizes and Materials

Tubing pipes are produced in seamless and welded styles, within a size range of 1.050 to 5 1/2 inches.

End Connections

Common connection types for tubing pipes include NUE (non-upset), EUE (external upset), and premium. Corrosion resistance under sour service conditions is critical, especially for casing and tubing.

 

OCTG Drill Pipe

Drill pipe consists of a heavy, seamless tube that rotates the drill bit while circulating drilling fluid. It allows drilling fluid to be pumped through the bit and back up the annulus. Drill pipe is typically constructed of durable steel, adhering to API 5DP and API SPEC 7-1 standards.

Product: Drill Pipe Application: Used in mines, water well drilling, coal production, 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 ensures thread connections of various types, including:

• Integral connections
• Extreme line connections
• Integral thread seal connections
• VAM premium connections
• Integral metal seal connections
• Coupled connections
• BTC
• API (STC and LTC)
• Threaded connections

 

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Price List of OCTG Seamless Pipe

Generally, steel casing pipes are more affordable than drill pipes or OCTG tubing, usually costing around 200 USD more than a standard API 5L pipe, factoring in the threading and coupling costs or the heating treatment.

 

OCTG Pipe Manufacturing Process

The manufacturing processes for casing and tubing pipes include:

• Continuous mandrel-rolling process and the push bench process for sizes between 21mm and 178mm OD.
• Plug mill rolling for sizes between 140mm and 406mm OD.
• Cross-roll piercing and Pilger rolling for sizes 250mm to 660mm OD.

These methodologies typically do not facilitate the thermo-mechanical processing that is customary for the strip and plate products used in welded pipes.

 

Basic Types of OCTG Line Pipe

OCTG Casing Pipe

OCTG Tubing

OCTG Drill Pipe

OCTG Seamless Pipe

 

Hot Sales of OCTG Casing, OCTG Pipe Threading, Discover OCTG Pipe Distributors, Learn the difference between OCTG and Line 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 Pipe Sizes
(Casing)
API5CT Weight
Lbs/ft Outside Diameter Wall Thickness Type End Finish Grade ln. mm ln. mm H-40 J-55 K-55 M-65 L-80 C-95 N-80 C-90 T-95 P-110 Q-125 7 5/8' 24.00 7.625 193.68 0.300 7.62 PS 26.40 7.625 193.68 0.328 8.33 PSLB PSLB PLB PLB PLB PLB 29.70 7.625 193.68 0.375 9.53 39.00 7.625 193.68 0.500 12.70 PLB PLB PLB PLB PLB 42.80 7.625 193.68 0.562 14.27 PLB PLB PLB PLB PLB 45.30 7.625 193.68 0.595 15.11 PLB PLB PLB PLB PLB 47.10 7.625 193.68 0.625 15.88 PLB PLB PLB PLB PLB 51.20 7.625 193.68 0.687 17.45 P 55.30 7.75 193.68 196.85 19.05 P 7 3/4' 46.10 8.625 219.08 0.595 15.11 P P P P P 8 5/8' 24.00 8.625 219.08 0.264 6.71 PS PS 28.00 8.625 219.08 0.304 7.72 PS PS 36.00 8.625 219.08 0.400 10.16 PSLB PSLB PLB PLB PLB PSLB 40.00 8.625 219.08 0.450 11.43 PLB PLB PLB PLB PLB 44.00 8.625 219.08 0.500 12.70 PLB PLB PLB PLB PLB 49.00 9.625 244.48 0.557 14.15 PLB PLB PLB PLB PLB 9 5/8' 32.30 9.625 244.48 0.312 7.92 PS 36.00 9.625 244.48 0.352 8.94 PS 40.00 9.625 244.48 0.395 10.03 43.50 9.625 244.48 0.435 11.05 47.00 9.625 244.48 0.472 11.99 58.40 9.625 244.48 0.595 15.11 PLB 59.40 9.625 244.48 0.609 15.47 P 64.90 9.625 244.48 0.672 17.07 P 70.30 9.625 244.48 0.734 18.64 P 75.60 9.625 244.48 0.797 20.24 P

 

API 5CT Tolerances

Execution Outer Diameter Wall Thickness Cold rolled Tube sizes (mm) Tolerances (mm) &#;114.3 ±0.79 &#;12.5&#; &#;114.3 &#;0.5&#;&#;1&#;

 

OCTG Pipe Materials/ OCTG Casing Pipe Standard/ OCTG Tubing Grades

The most prevalent materials for OCTG pipe include API H40, J55, K55, L80, N80, P110, and Q125 (covering both casing and tubing pipe). These API grades are characterized by enhancing mechanical properties (both tensile and yield strength).

The aforementioned standards govern the features of OCTG regarding

• Manufacturing methods
• Joint types and Length Range
• Wall thickness
• Casing Weights
• Steel Grades
• Connections
• Chemical Properties
• Tensile Properties

 

OCTG casing and tubing pipe are available in the following material grades:

 

API H40

API H40 grade is intended 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

0.030

Mechanical 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 relatively low steel grade used in oil drilling, often applied for 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 the group of steel grades designed for corrosion-resistant casing. The L80 API oilfield casing pipe comprises L80-1, L80-9Cr, and L80-13Cr. L80-1 is suitable for H2S environments, whereas L80-9Cr and L80-13Cr are utilized in CO2 settings.

 

Composition Standard of API L80

C

Mn

Mo

Cr

Ni

Cu

Ti

P

S

Si

V

Al

Min

Max

0.430

1.900

0.03

0.03

0.45

 

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

Max

0.300

0.900

8.000

0.5

0.25

0.02

0.01

1

Mechanical Behavior 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 %

API N80

API-5CT N80 oilfield casing pipe consists of types N80-1 and N80-Q. These materials are consistent concerning chemical composition and mechanical attributes, differing only in terms of heat treatment.

API-5CT N80 oilfield casing pipe consists of types N80-1 and N80-Q, which are consistent regarding chemical composition and mechanical attributes, differing only in 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 %

API P110

The P110 API-5CT steel casing pipe represents the highest grade among other steel grades, characterized by a white band on the finished casing for identification.

API Q125

This API grade is predominantly applied for deep wellbore service and is typically not utilized in sour condensate wells.

Premium Connections of OCTG

The Premium Connection Series consists of a specialized range of casing tubing accessories manufactured and marketed by the Oil Country Tubular Goods Supply.

• Includes both tubing and casing parts extensively used in high-pressure oil wells.
• Casing tubing accessories from this series are effective for high-pressure gas wells as well.
• Deep and over-deep wells are significant for the application of this series.
• Drill accessories of this variety are beneficial for high-collapse wells and wells requiring hot drilling techniques.
• Drill pipes of this kind are crucial when commencing oriented wells and particularly over-clint wells that need to be drilled horizontally.

OCTG Steel Pipe Chemical Composition

Group	OCTG Pipe Materials	Type	C	Mn	Mo	Cr	Ni max.	Cu max.	P max.	S max.	Si max.
1	H40		0.03	0.03
1	J55		0.03	0.03
1	K55		0.03	0.03
1	N80	1
1	N80	Q
1	R95		0.45		1.9
2	M65
1	L80	1	0.43		1.9		0.25	0.35	0.03	0.03	0.45
1	L80	9Cr			0.6			1
1	L80	13Cr			0.25	1		12
1	C90	1	0.35		1.2		0.25	0.85
1	T95	1	0.35		1.2		0.25	0.85
1	C110		0.35		1.2		1		0.4
3	P110		0.6		758
4	Q125	1	0.35		1.35		0.85		1.5

 

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

H40

0.5

276

552

414

1

J55

0.5

379

552

517

1

K55

0.5

379

552

655

1

N80

1

0.5

552

758

689

1

N80

Q

0.5

552

758

689

1

R95

0.5

655

758

724

M65

0.5

448

586

586

22

235

L80

1

0.5

552

655

655

23

241

1

L80

9Cr

0.5

552

655

655

23

241

1

L80

13Cr

0.5

552

655

655

23

241

1

C90

1

0.5

621

724

689

25.4

255

1

T95

0.5

655

758

724

25.4

255

1

C110

0.7

758

828

793

30

286

3

P110

0.6

758

4

Q125

1

862

931

a The carbon content for L80 may increase up to a maximum of 0.50% 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 rise up to a maximum of 0.55% if the product is oil quenched.

d The molybdenum content for T95 Type 1 may be reduced to a minimum of 0.15% if the wall thickness is below 17.78 mm.

e For EW Grade P110, the phosphorus content should not exceed 0.020% and the sulfur content should not surpass 0.010%.

NL = no limit. Elements shown shall be reported in product analysis.

 

Features of OCTG Line Pipe

All OCTG pipes have a standard requirement for reliable hardness. Whether it is OCTG tubing, OCTG pipe, or OCTG drill pipe, there is a consistent required standard pertaining to super hardness. Manganese and chromium are used prominently as essential alloys to confirm cohesiveness and durability.

 

OCTG Tubing and Casing Grades & Material Selection

Depending on the application, OCTG products may comprise various steel grades and material compositions. Both are influenced by features such as:

• High Collapse
• Corrosion Resistance and Sour Services
• Pressure Resistance
• Deep Wells
• High Collapse & Sour Service
• Highly Deviated Wells
• Extended Reach Wells
• High Torque

 

Oil Country Tubular Goods (OCTG Pipe) For Sale

• OCTG Market
• OCTG Welded Pipe
• OCTG ERW Pipe
• OCTG Oil and Gas
• OCTG Tubular
• OCTG Tubing
• OCTG Threading
• OCTG Oilfield Pipe

• OCTG Pipe Chart
• OCTG Line Pipe
• OCTG Green Tube
• OCTG Gas Pipe
• OCTG and Line Pipe
• OCTG Coating Pipe
• OCTG Corrosion Pipe

 

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