Product Specification

Stainless Steel Seamless Casing 316L

Products Description                                                      

Casing and tubing play a major role in the oil and gas exploration & production. While casing form the wall of the well and is a permanent structure, tubing runs inside the casing through which oil or gas is brought upto the surface. Both are critical components of the oil or gas well as failure will result in huge loss. The requirements can be very stringent as the depth of the well increases. Sometimes the well has to go through rocky layers and sometimes inside the sea. Size, grade, quantity of pipes depend on the design of the well which is based on product, depth, pressure, volume & environment. With most of the easy exploration areas exhausted & exploration going into difficult areas, the demand for higher grade & better quality pipes is increasing every year.

Stainless steel pipes find numerous applications across various industries due to their unique properties. Here are some common applications for stainless steel pipes:

1. Water and Wastewater Systems: Stainless steel pipes are widely used in water supply systems, wastewater treatment plants, and plumbing applications. Their corrosion resistance and hygienic properties make them ideal for carrying potable water and managing sewage.

2. Oil and Gas Industry: Stainless steel pipes are extensively used in the oil and gas sector for exploration, production, and transportation. They are suitable for conveying various fluids, including crude oil, natural gas, and corrosive chemicals, in offshore and onshore environments.

3. Chemical and Petrochemical Processing: Stainless steel pipes are vital in chemical and petrochemical plants, where they handle corrosive substances, acids, and aggressive chemicals. They provide the necessary resistance to corrosion and maintain the integrity of the process systems.

4. Food and Beverage Industry: Stainless steel pipes are prevalent in the food and beverage industry due to their hygiene, cleanliness, and resistance to corrosion. They are used for conveying food products, beverages, and dairy products, as well as for process piping in breweries, wineries, and food processing plants.

5. Pharmaceutical Industry: Stainless steel pipes play a crucial role in pharmaceutical manufacturing and processing. They are used for transferring fluids, chemicals, and pharmaceutical ingredients while maintaining a sterile and hygienic environment.

6. Construction and Architecture: Stainless steel pipes are utilized in architectural and construction projects for structural purposes, handrails, façades, and decorative elements. They offer durability, aesthetic appeal, and resistance to environmental factors, making them suitable for both interior and exterior applications.

7. Automotive Industry: Stainless steel pipes are employed in exhaust systems for automobiles due to their high heat resistance and durability. They can withstand the corrosive effects of exhaust gases and contribute to improved performance and longevity of the exhaust system.

8. Heat Exchangers and HVAC Systems: Stainless steel pipes are widely used in heat exchangers, air conditioning systems, and HVAC (heating, ventilation, and air conditioning) applications. They enable efficient heat transfer and maintain the integrity of the systems in demanding environments.

9. Mining and Construction Equipment: Stainless steel pipes are used in mining equipment, construction machinery, and heavy-duty applications where strength, durability, and resistance to corrosion and abrasion are essential.

10. Aerospace and Defense: Stainless steel pipes are utilized in aerospace and defense applications, including aircraft manufacturing, missile systems, and naval vessels. They provide strength, corrosion resistance, and reliability in demanding and harsh environments.

These are just a few examples of the wide-ranging applications of stainless steel pipes. Their versatility and excellent properties make them suitable for numerous industries and sectors where reliability, corrosion resistance, and durability are required.

Seamless casing and connection is considered the most commonly utilized oil-field casing today. Seamless casing is produced in a pipe mill using a billet, a solid cylindrical piece of steel.

The manufacturing process takes place through the exposure of the billet to high temperature; billet penetration using a mandrel; passage of the billet into the rollers and internal mandrels to size it up; treatment of the tube with heat; and straightening and final sizing.

Seamless Casing and Connection Features

The dimensional and wall thickness specifications of oil well seamless casing ranges from 1/8 inch to 26 inches OD. It is particularly suited for high-pressure operations, including oil and gas exploration and drilling, hydrocarbon industries and refineries, and oil and gas transportation.

The threading of the connections of the seamless casing may be done either by the manufacturer or by other companies. Ensuring the uniformity of the seamless casing wall thickness is a challenge to manufacturers. The production process may cause slight eccentricity to the cross section of the seamless casing wall.

Seamless Casing and Connection over Welded Type
Seamless casing and connection presents advantages over the welded type. The primary advantage of the seamless casing for oil well is the absence of a weld seam, which is considered a weak spot that can pose risks of failure and corrosion. In addition, better roundness is seen with seamless casing and connection. Lastly, the possibility of having a weak seam is omitted.

The only weak points associated with seamless casing and connection for oil wells are the disparities in wall thickness, challenges in the production process, and the higher costs.

Casing Specification:
In utilizing seamless casing and connection, the purchaser and designer should follow the standards set by the American Petroleum Institute (API). The organization provides a variety of manufacturing standards for tubing and casing, which are also adopted by the International Standards Organization (ISO).

Casing specifications are usually presented in outer diameter (in or mm), nominal weight (lb/ft or kg/m), wall thickness (in or mm), and grade and connection type.

Outer Diameter
Outer diameter is usually fixed for a particular size.

Nominal Weight
The nominal weight presented in lb/ft or kg/m portrays the average linear weight of the seamless casing and connection, which limits the casing wall thickness that in turn defines the inner diameter.

Grade
The yield strength and material composition of the seamless casing are indicated by the grade of the casing.

Connection Type
The connection type shows the type of thread used to affix the oil well seamless casing joints. Premium connections can be defined as:
P – plain end
S – short round thread
B – buttress

L – long round thread

OASIS is a manufacturer of seamless casing and tubing in China. In the past two decades, we have been providing catering services for the oil and gas industry not only in China but also all over the world. Years of experience has provided us with expertise in manufacturing various special-purpose grades and pipes. Our skilled and experienced production team is capable of meeting any other requirements of customers and meeting tight schedules for supply of large projects. Our dedicated quality team is always eager to provide products that exceed the expectations of demanding customers. We are approved by API 5CT and most leading oil and gas companies.

Specifications                                                                  

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