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API Casing

Application:Oil well casing serves as well sidewall Pipe Standard:API SPEC 5CT Size:OD: 114.3-508mm,WT: 5.21-16.13mm Process Type: Seamless (SMLS), Electric Resistance Welded (ERW) Grade: J55, K55, N80-1, N80-Q, L80-1, L80-9Cr, L80-13Cr,C95, P110. Thread types:STC, LTC, BTC etc


Oil country tubular goods



Casing is used for lining the complete borehole which has been dug into the ground to procure oil. Similar to the drill pipe, the oil well casing pipe is also subjected to axial tension, therefore they are required to be made from high-quality strong steel material. OCTG casing is large diameter pipe which are held in place in the borehole using cement.

The diameters of OCTG casing pipe range from 4.5″ to 36″. The well-cemented pipe acts as the structural component of the well and offer hole integrity. They prevent the well from collapsing when the drilling process is on. Good quality, well cemented casing can stay in place for the whole life of the well.

The oil well casing pipe are further divided into:

Conductor Casing – Conductor casing is the first boundary between the surface and the subsurface. It helps prevention of well collapse; it keeps away the groundwater and most importantly provides structural support. Conductor casing is installed in the ground by either drilling it or hammering it down. They are available in sizes ranging from 18″ to 36″.

Surface Casing – The purpose of Surface casing is primarily environmental and to ensure safety. It helps in separating the freshwater zones, offering protection from blowout and supporting the wellhead and blow out prevention equipment. Therefore surface casings are required to maintain very high safety standards. They are responsible for supporting the next casing in line.  They may vary in size depending on their purpose, but the most common size of surface casing is 13 3/8”.

Intermediate Casing: Intermediate casing is not always required in all types of oil and gas production. If used, they are placed between the surface and the production casing. They are available in sizes ranging from 13 3/8” to 16”.

Production Casing – Production casing help provide structural integrity and pressure control of the hydrocarbon-bearing sections mainly during the production of oil.

Production Liner – Production liners can be suspended from the production casing or one of the previous casings. They help in reducing the cost significantly as the liner is not required to run through the full depth of the well. Liners can be pre-perforated to help save time and cost.


More casing pipes and their colors


API 5CT Well Casing Length:


API 5CT Casing

Range 1

Range 2

Range 3





Labels OD(mm) WT(mm) J55/K55 N80 L80 C90/T95 P110 Q125
4 1/2 9.5 114.3 5.21 PS - - - - -
10.5 114.3 5.69 PSB -        


Warehouse Storage

Shandong Juhuo Special Steel Co., Ltd. is a comprehensive enterpriseintegrating steel supply and processing. The company has a large inventory ofvarious metal materials such as stainless steel, galvanized, profiles, aluminum.copper, lead, etc, which can meet the needs of customers in different fields.The company has strong strength and has a professional and technical teamwith excellent technology and rich experience.The company has also introduced advanced production equipment andprocessing technology, which can provide customers with steel products ofvarious specifications and processing requirements.



Packing and shipping

Thecompany has also established a complete after-sales service system to providecustomers with first-class services.In the company's business philosophy, customer first, integrity-based, qualityfirst. 



Customer conversation

We provide the products consultation , purchase plan suggestion , logistic service ( including the shipment service , custom works ,etc ).



Application field

Taking technology as the guide, quality as the guarantee, and service asthe purpose, the company actively explores the market, expands the scale ofoperation, and constantly improves enterprise management to ensure productquality and service quality.



Customer visit






Reasonable Price, Reliable Quality,Considerate Service

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Q:What is your working time?

A:In general, our online service time is Beijing time: 8:00-22:00, after 22:00, we will reply to your inquiry during the next working day.

Q:How to pack the products?

A:The inner layer has a waterproof paper outer layer with iron packaging and is fixed with a fumigation wooden pallet. It can effectively protect products from corrosion during ocean transportation.

Q:Can you send samples?

A:Of course, we can send samples to all parts of the world, our samples are free, but customers need to bear the courier costs.

Q:What product information do I need to provide?

A:You need to provide the grade, width, thickness, coating and the number of tons you need to purchase.

Q:What are the shipping ports?

A:Under normal circumstances, we ship from Shanghai, Tianjin, Qingdao, Ningbo ports, you can choose other ports according to your needs.

Q:About product prices?

A:Prices vary from period to period due to cyclical changes in the price of raw materials.

Q:What are the certifications for your products?

A:We have ISO 9001, SGS, EWC and other certifications.

Q:How long does your delivery time take?

A:In general, our delivery time is within 30-45 days, and may be delayed if the demand is extremely large or special circumstances occur.

Q:Can I go to your factory to visit?

A:Of course, we welcome customers from all over the world to visit our factory. However, some of the plants are not open to the public.

Q:Does the product have quality inspection before loading?

A:Of course, all our products are strictly tested for quality before packaging, and unqualified products will be destroyed.

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