CustomFire Fighting Pipes,Seamless and Welded Steel PipesManufacturerSince 1991

Drilling and Extraction of Oil and Gas

Home / Casing & Tubing

Drilling and Extraction of Oil and Gas

Drilling and Extraction of Oil and Gas
Oil and Gas Project
Seamless & Welded steel pipe
1/2" - 20"
2500 tons
Colombia, Peru, Pakistan, Dubai, Saudi Arabia, Indonesia etc


OCTG means Oil Country Tubular Goods, which refers to steel used in oil and gas extraction and production processes, including Drill pipe, Casing, Tubing, Couplings, Connections and Accessories, for the oil and gas industry on land and offshore. API 5CT is the most common and important standard to ensure the normal production and exploitation of oil and gas.

About Casing

OCTG casing, which can also be referred to as “encasement pipe”, is used as a protective layer, which surrounds the steel tubing.

learn more

How to use

Casing is placed before drilling begins and completely surrounds the wellbore. Its purpose is to protect the soil layers and groundwater from contamination by drilling mud and/or frac fluids. Additionally, casing stabilizes the wellbore. Drilling and casing operations alternate – the drill string is removed at predetermined intervals and the wellbore is lined and cemented with casing.

Benefits and effects

The casing holds the drill string, preventing the unstable upper formation from caving in and prevention of contamination of water well zones;

Provides an even internal bore for easy installation of the production equipment;Helps prevention of the contamination of production zones;

Helps prevention of fluid (oil) loss;Helps seal off the high-pressure zones from the surface of the earth.

Common specifications

Standard: API 5CT Grades: J55/K55, N80-1, N80Q, C90, T95, P110, Q125 and 13Cr

Casing Range of Sizes: 5 1/2” to 20” Length: R2, R3

Ends Type: BTC (Buttress Thread Coupling), LTC (Long Buttress Thread Coupling), Premium connection

About Tubing

OCTG tubing is the conduit, usually steel pipe, used to transport fluid, oils, and gas to surface facilities and systems for processing.

learn more

How to use

Tubing is used to carry petroleum from the well’s depths to the surface. This is the third phase of the wellbore process. Oil and gas occasionally self-elevate to the surface; however, pumps are typically required to bring the fluids to the surface. Besides the 4 1/2-inch diameter, tubing is normally smaller in diameter than casing. Consequently, tubing must be affixed to external support structures, such as a rig or platform, in order to prevent collapse due to pressure differentials.

Benefits and effcts

maintain borehold stability; prevent contamination of water sands;

isolate water from producing formations;

control well pressures during all phases of drilling, production, and workover operations.

Common spcifications

Standard:API 5CT Grade: J55, K55, N80-1, N80Q, C90, C95, P110, Q125

Tubing range of Sizes: 1.05”, 1.315”, 1.66”, 1.9”, 2 3/8”, 3 1/2” and 4 1/2” Length: R2, R3

Ends Type: BTC, UN, EUE, Premium ends that could completely replace the tubing premium connection of Vam, Tenaris, Hunting, TSH etc.


01-Can you provide the specification of thecasing and tubing?

Yes, please contact with our manager.

02-Do you sale Accessories of the OCTG tubing?

Yes, we are professional manufacturer in full products of OCTG.

03-3.Do you have API 5CT certificate?

Yes, we have API 5CT certificate.increasing the durability of the fire sprinkler pipe.

More than a manufacturer and distributor, we focus on your business, One-stop Solution For All Your Piping Needs.

Contact Person
Mac Han
Mac Han