Press

Classification of Oil Casing Pipe Steel Grades


The oil casing is used to support the oil and gas well walls to ensure the normal operation of the entire well after the drilling process is completed. Each well is based on different depths of drilling and geology, using several layers of casing. After the casing is down, the cement is to be cemented. It is different from the oil pipe and the drill pipe and cannot be reused. It is a disposable material. Therefore, the consumption of casing accounts for more than 70% of all oil well pipes. Casing can be divided into: conduit, surface casing, technical casing and oil casing.

The American Petroleum Institute API standard specifically targets oil and gas: casing, tubing and line pipe standards used in industry. In the standard, the casing and tubing steel grades are divided into several grades, namely H-40, J-55, K-55, N-80, L-80, C-90, T-95, P-110, Q- 125, each level has a different heat process. In API 5CT, the raw materials were divided into four groups. The first group is H, J, K, N, the second group is C, L, T, the third group is P, and the fourth group is Q. The numbers represent the intensity level, and the codes K, N, L, C, and T represent nothing to explain. The following numbers represent the minimum yield strength of the material. The unit is KSI (thousands per square inch), H, N, K, J is the first group, the yield strength of the material is 200 MPa, L, C, T are two groups, the yield strength of the material is 100 MPa, P110 is the third group, and Q125 is the fourth group.

The API is divided into 4 groups.
The first group represents an ordinary pipe, that is, a low-strength pipe;
The second group represents a tube resistant to sulfur and corrosion;
The third and fourth groups represent high intensity levels.

J is the code name, and the API specification states that the value after the steel grade code is the minimum yield strength in units of 1000 psi (6894.7632 kPa).
For example, J-55, J is a steel grade symbol, and "55" means 55 x 1000 psi, which refers to the minimum yield strength of steel.



New service from OilVoice
Trip Shepherd is for companies who need to track their staff in areas of risk.
It's free to use, so we invite you to try it.

Visit source site

https://permanentsteel.com/productshow/casing-pipe...

casing pipesteel gradeclassificationAI in Oil and Gas

More items from lvy


Annealing Process of Seamless Steel Pipe

Annealing process of  seamless steel pipe : 1. Fully annealed. It is used to refine the coarse and superheated structure with poor mechanical properties in medium and low carbon steels after casting, forging and welding. The workpiece is heated to a temperature between 30 and 50 ° C above the temper ...

lvy lee - Permanent Steel Manufacturing Co.,Ltd


Posted 1 day agoPress > Seamless steel pipecarbon steelannealing process

API Coupling for Tubing and Casing Pipe

The  casing pipe  coupling is a kind of oilfield drilling tool, which is mainly used for the connection of the oil pipe, and mainly solves the problem that the existing coupling easily generates fatigue fracture due to stress concentration. The tubing coupling structure is: the tubing end is connec ...

lvy lee - Permanent Steel Manufacturing Co.,Ltd


Posted 8 days agoPress > couplingcasing pipetubing

Technical Requirements for Heat Preservation of Spiral Steel Pipes

After the heat insulation treatment of spiral steel pipes( SSAW steel pipe ), people are accustomed to call them heat insulation steel pipes.The insulation layer of heat insulation steel pipes is filled with rigid polyurethane foam. The quality requirements for the insulation layer of spiral steel p ...

lvy lee - Permanent Steel Manufacturing Co.,Ltd


Posted 9 days agoPress > spiral steel pipessaw steel pipeheat preservation +1

Oil Casing Pipe Tempering Process and Category

The tempering process of the  casing pipe  is a heat treatment process of reheating the quenched workpiece to a suitable temperature lower than the lower critical temperature, and cooling to room temperature in a medium such as air or water or oil after a certain period of time. The purpose of temp ...

lvy lee - Permanent Steel Manufacturing Co.,Ltd


Posted 14 days agoPress > casing pipeTempering ProcessCategory

Specification and Requirements for Seamless Steel Pipe Marking

In the relevant regulations, there are a series of regulations and requirements for  seamless steel pipe  marking. The specific requirements for the logo are as follows: 1. The seamless steel pipe manufacturer's logo should be eye-catching, firm, clear, standardized, and not easy to fade. 2. The m ...

lvy lee - Permanent Steel Manufacturing Co.,Ltd


Posted 16 days agoPress > Seamless steel pipemarking3PE
All posts from lvy