Anti-corrosion countermeasures of oil casing

1. First of all, ensure that the water quality meets the standards, and strictly monitor and manage the water quality. Implement cleaning and separate injection, strengthen the cleaning of main water pipelines, ensure that the water quality in the station and the bottom of the well reach the standard, and reduce the introduction of corrosion sources into the annular space;

2. For water injection wells that have been newly put into production, adopt annulus protection liquid mainly for sterilization, and form a system to does it regularly;

3. In view of the accelerated effect of mechanical scratches on the corrosion of oil casing, it is recommended to add a rubber ring to the tubing coupling or add a centralizer to the serious part of the well deviation to avoid the tubing scratching the casing and the tubing during the operation and water injection. One side touches the casing;

4. In view of the severe bacterial corrosion under the scale and the slow growth and killing of SRB at high-temperature, high-temperature water or steam of 100 degrees Celsius can be injected into the annulus regularly to kill the SRB under scale;

5. It is not recommended to promote the use of cathodic protection and coated casing before the corrosion in the casing of the water injection well is effectively controlled.