OCTG Casing Pipe

Weight calculation
[(Outer diameter-wall thickness)*wall thickness]*0.02466=kg/meter (weight per meter)
chemical composition
(1) According to the provisions of SY/T6194-96. The casing and its couplings are of the same steel grade. Sulfur content <0.045%, phosphorus content <0.045%;

Anti-corrosion countermeasures for oil casing
1. First, ensure that water quality meets standards and strictly monitor and manage water quality. Implement separate cleaning and injection, strengthen the cleaning work of main water pipelines, ensure that the water quality in the station and at the bottom of the well meets the standards, and reduce the introduction of corrosion sources into the annular space.
2. For water injection wells that have been newly put into production, use annular protection fluid mainly for sterilization, and form a system to add it regularly.
3. In view of the acceleration effect of mechanical scratches on the corrosion of oil casing, it is recommended to add a rubber ring to the coupling of the oil pipe or a centralizer to the severe deviation of the well to prevent the oil pipe from scratching the casing and during the water injection process. One side contacts the casing.
4. In view of the serious bacterial corrosion under the scale and the slow growth and killing of SRB at high temperatures, high-temperature water or water vapor of 100 degrees Celsius can be regularly injected into the annulus to kill the SRB under the scale.
5. Before the corrosion in the water injection well casing is effectively controlled, it is not recommended to promote the use of cathodic protection and coated casing.