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OCTG(Oil Country Tube Goods)
Oil casing is a steel pipe used to support the walls of oil and gas wells, ensuring the normal operation of the entire well during and after the drilling process.

OCTG Casing pipe

                     and tubing

Oil country tube goods (OCTG) is a high-strength steel pipe used for crude oil and natural gas production, which has excellent corrosion resistance, internal stress, and corrosion cracking resistance. The quality and performance of OCTG oil casing products produced in countries and regions such as China, South Korea, and Japan are core component products in oil drilling sites such as Texas in North America, Saudi Arabia, the United Arab Emirates, Dubai, Abu Dhabi, Iraq, Iran, Oman, and Nigeria in the Gulf and Middle East.

OCTG Casing tubing(Seamless tube)


Specification



Processing form 

of 

pipe end


Grade

O.D

Designation of Diameter

(W.T)

Wall thickness

Use

API 5CT

Specification for oil pipes and casings

PE、NUE、EUE、STC

LTC、BTC、VAM etc.


J55、K55、L80

N80-1、N80A、P110、Q125


60.3mm - 508.2mm

4.24-22.23mm

Oil casing


LC80S、LC90S

LC95S、LC110S


60.3mm - 177.8mm

424-19.05mm

H2S resistant oil casing


Note



inch:2"、2-3/8"、2-7/8"、3-1/2"、4-1/2"


※ R1 (6.1m~7.32m)

※ R2 (8.53m~9.75m)

※ R3 (11.58m~13.72m)

※   API 5CT petroleum casing can be divided into seamless steel pipes and welded steel pipes. Welded steel pipes mainly refer to straight seam steel pipes, while large-diameter petroleum casing is generally submerged arc welded straight seam steel pipes. The main application countries of this product are mainly distributed in the Middle East, Europe and America.

OCTG Casing tubing (Welded Pipe)


Specification



Processing form 

of 

pipe end


Grade

O.D

Designation of Diameter

(W.T)

Wall thickness

Use

API 5CT

Specification for oil pipes and casings

PE、NUE、EUE、STC

LTC、BTC、VAM etc.

J55

60.3mm - 508.2mm

4.24-22.23mm

Oil casing

H2S resistant oil casing

K55
L80
N80-1
N80A
P110
Q125


Note



inch:1.9"、2-3/8"、2-7/8"、3-1/2"、4-1/2"、7"


※ R1 (6.1m~7.32m)

※ R2 (8.53m~9.75m)

※ R3 (11.58m~13.72m)


OCTG stands for "Oil Country Tubular Goods." These are a group of seamless rolled products such as casing, tubing, and drill pipes that are used in the exploration and production of oil and gas. OCTG products are crucial in the lifecycle of an oil or gas well, starting from drilling to production and finally abandonment or reclamation.

Here's a breakdown of the main types of OCTG products:

  1. Casing: Casing pipes are large diameter pipes that are set into drilled oil or gas wells to stabilize the wellbore and prevent it from collapsing. Casing also helps in isolating different formations and controlling well pressures.

  2. Tubing: Tubing is a smaller diameter pipe installed inside the casing to transport oil or gas from the wellbore to the surface. It also provides a conduit for injecting fluids into the well.

  3. Drill Pipes: These are heavy, seamless pipes used to rotate the drill bit and circulate drilling fluid during the drilling process.

OCTG products are manufactured to withstand harsh downhole conditions, including high pressures, corrosive environments, and varying temperatures. They are typically made from high-strength steel alloys and undergo rigorous testing and inspection to ensure reliability and safety in oil and gas operations.