Product Specification

SS Casing Pipe

Products Description                                                      

Oil and gas production begins by drilling a well in an oilfield. Once a borehole is made, structural stability should be retained. To do this, a casing is inserted and pushed inside so that the wellstream will be sufficiently supported and protected and will not collapse or cave in. The gap between the wall of the well and the casing is cemented to fix the casing in place.Casing is the major structural component of a well. It is a tubular steel product used to line the wellbore (maintain borehole stability), prevent contamination of water sands, isolate water from producing formations, and control well pressures during drilling, production, and workover operations. Casing provides locations for the installation of blowout preventers, wellhead equipment, production packers, and production tubing.

Casing sizes are of different diameters and wall thickness. Made according to various specifications set by international organizations such as the American Petroleum Institute (API) and the International Organization for Standardization (ISO), the casing size nominal diameter is equivalent to the theoretical diameter of the pipe and allowing for tolerance usually for an oversized pipe.The inside diameter of the casing is vital as this dimension is a primary consideration in determining the tools that can pass through it. Likewise, it either determines the wall thickness or vice versa where the diameter is dependent on the required wall thickness.

Casing grades are classified according to metallurgical properties and mechanical properties such as yield strength, tensile strength, and hardness. Manufacturers adhering to standards produce casing grades that meet ISO 11960 or API Spec 5CT. These include yield strengths that range from 40,000 psi to 125,000 psi. As the grade increases, so does the strength of casing material.Casing grades are based on set standards, or upon request, may be custom-made by particular manufacturers according to specifications provided by the customers.

Manufacturing types and processes

1. Seamless Hot Rolling Processes
Round Pipe Billet → Heating → Perforation → Three Roll Skew Rolling, Continuous Rolling or Extrusion → Off Pipe → Sizing (Or Reducing Diameter)→ Cooling → Billet → Straightening → Water Pressure Test ( Or Flaw Detection) → Marking → Storage
2. Seamless Cold Rolling (Cold drawn) Processes
Round Pipe Billet → Heating → Perforation → Head → Annealing → Pickling → Oil (Copper) → Multi Pass Drawing (Cold Rolling) → Billet → Heat Treatment → Straightening → Water Pressure Test → Marking → Storage
3. Longitudinal welding (Straight seam welding) processes
Including ERW, EFW.

Corrosion Resistance of Stainless Steel Tube and Pipe

Corrosion resistance performances is the key feature for stainless tube. The commonly used types of steel involve ferritic and martensitic steel, that are predominantly made by adding chromium and manufactured through heat-treatment or to be annealed. There are austenitic stainless steel tubing products that are rich in chromium and nickel and they offer better resistance levels when used under the same conditions as compared to martensitic or ferritic materials.

Specifications                                                                  

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Company information:

Oasis Oil Tools Co.,LTD, located in the industrial park of high-tech enterprises in Fengquan District, Xinxiang City. Oasis now has more than 150 staff, among them 6 persons are senior engineer. Since founded, OASIS always adhere to the “development on innovation, development on efficiency and treat customers with honesty” business philosophy. After many years’ efforts, now OASIS has developed into a famous manufacturer which integrates the research and development, design, manufacture and sell water well screens/johnson screens, oil well screens and sand control well screens, bridge slotted well screens, pipe based well screens, perforated pipe (base pipe), gravel pre-packed well screens, wedge wire screens, passive water intake screens etc. Water, oil and gas well filtering products as well stainless steel tubes and pipes and industrial parts.

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