Tubing & Casing(OCTG) manufacturer & supplier in China: The dominance of the petroleum industry

In the whole petroleum industry, the most usage is Tubing & casing(OCTG), even account for 70%. so its safety and service life is the most important thing.

  • Ensure the steel grade of OCTG

  • Ensure the anti-corrosion performance of OCTG

  • Ensure the anti-collapse performance of OCTG

  • Ensure that the oil casing can adapt to complex geology

What is Tubing & Casing(OCTG)?

OCTG stands for Oil Country Tubular Goods, which is used for the production of oil and gas (drilling activities), both onshore and offshore. It mainly includes casing pipe, tubing, drill pipe three kinds, which are manufactured according to the specifications set by API (American Petroleum Institute).

The API 5CT tubing & casing steel pipes are designed to withstand harsh environments and extreme temperatures, making them suitable for use in oil and gas exploration and production. Tubing is used for transporting the oil or gas from the reservoir to the surface ground. Tubing pipes generally have a smaller diameter than casing. Casing is used to line the borehole. They not only protect the soil and groundwater layers from contamination, but also stabilize the borehole.

Metleader produces tubing and casing steel pipes made from high quality steel materials, which have the advantages of high resistance corrosion and erosion performance, so they can resist special conditions, while ensuring long-lasting stability. Our OCTG products can be either seamless or welded, and available in different sizes, grades and lengths to meet specific customer requirements.

The main types of Oil Country Tubular Goods (OCTG)

OCTG tubing pipe

OCTG tubing pipe - transporting oil and gas to the surface ground. Tubing is a relatively small diameter steel pipe that is available in various sizes ranging from 1 1/4” to 4.5”. It is placed inside the wellbore through the casing pipe to transport natural gas or crude oil from an oil or gas layer to the surface ground after the drilling is complete. Tubing must be adequately strong to withstand the pressure generated from the extraction process.

OCTG casing pipe

OCTG casing pipe - stabilize the wellbore. Casing pipe is a large diameter steel pipe with the diameter range from 4.5” to 20”, which is used to drill into the ground for procuring oil or gas and stabilizing the wellbore. It is cemented into the borehole to protect both subsurface formations and the well bore from collapsing and to allow drilling fluid to circulate and extraction to take place.

OCTG drill pipe

OCTG drill pipe - pipe for drilling. Drill pipe is a seamless steel pipe with a hollow section and thin-walled, which is available in various sizes, strengths and wall thicknesses. It allows drilling fluid to be pumped down the hole through the bit and back up the annulus, fluids circulate easily in the well because of the annulus. And drilling pipe can be used multiple times In the mining and oil and gas refining process.

Tubing & Casing(OCTG) material:

Carbon steel casing pipe & tubing

Carbon steel casing pipe & tubing are widely used because the carbon steel materials have the advantages of cheap, easy processing and corrosion resistance. The common carbon steel materials refer to API 5CT J55, K55, N80, L80-1, L80-9Cr, L80-13Cr, P110, etc.

Stainless steel casing pipe & tubing

Stainless steel material has the advantages of corrosion resistance, high temperature resistance, high overall strength and not easy to deformation, so the stainless steel casing & tubing are widely used in Marine development and other fields. The common stainless steel materials are 304, 316, 321 and so on.

Alloy steel casing pipe & tubing

Alloy steel material has the advantages of high strength, corrosion resistance, high temperature and high pressure, etc., so the alloy steel casing & tubing are widely used for the production and development of oil and gas wells. The common materials refer to Cr-Mo alloy steel, Ni-Cr-Mo alloy steel and so on.

Features

It can not be underestimated the importance of casing pipe and tubing in the process of oil and gas exploitation. In fact, it can not only protect the oil well environment and oil resources, but also improve the exploitation and production.

Stabilize the wellbore

Casing pipe provides a strong and rigid support structure to ensure the borehole does not collapse under the pressure of the surrounding rock formation, providing stable access to drilling and production activities.

Prevent pollution

As a protective barrier, casing pipe can isolate oil and gas from surrounding rock and groundwater, preventing the contamination of hydrocarbons by undesirable fluids, and protecting freshwater aquifers from potential contamination.

Well Control

Casing pipe plays a vital role in high-pressure environments. It works by guiding oil and gas upward, to keep pressure within safe limits and reduce the risk of blowouts and other well control incidents.

Selective manufacturing facilities

In Wells with multiple hydrocarbon formations, selective production is achieved by using different diameter casing pipes to isolate different production intervals and control fluid flow.

Equipment conduit

Casing pipe is used as a conduit for production tubing, downhole pumps and other equipment, connecting the wellhead to the production equipment, providing a safe basis for oil and gas to be transported to the surface.

Applications

The main application scenarios of tubing & casing pipe are almost all related to oil and gas exploration projects. There are main aspects as follows:

  • Oil well extracting

  • Borehole

  • Borewell

  • Extracting oil or gas from wells

Tubing & Casing Customization

Customization is available. Metleader can provide flexible customized production service according to the drawings or technical data from clients to meet special requests.

Comparisons

Items Our advantages Other suppliers
Raw material  Famous steel pipe factories TPCO, Bao Steel etc Local small factories
Production test 100% test Sampling test
Non-conforming products Reject Repair 
NDT 100% inspect  Sampling test
Heat treatment 100% proceed May not be done 

Quality Assurance

Due to the diversity and complexity of oil casing usage scenarios, we must supply qualified steel grades according to customer order requirements. Only when the steel grade meets the standard can the actual application performance of the product be qualified and meet the engineering acceptance standards.

2) Compared to ordinary carbon steel pipes, the production and processing processes of OCTG are more complex, which puts higher requirements on manufacturers. Advanced production technology can improve the mechanical properties, corrosion resistance, and deformation resistance of petroleum casing.

3) The inner and outer surfaces of OCTG must meet the requirements and must not have cracks, wrinkles, delamination, or scars.

4) OCTG also provides couplings with tapered threads, parallel threads, etc., which are safe and convenient.

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