Anti-corrosion method of oil casing

Anti-corrosion method of oil casing

1. To make sure 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 meets 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, use annulus protection liquid mainly for sterilization, and add annulus protection liquid regularly;

3. Mechanical scratches can accelerate the corrosion of the oil casing. 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 one side during the operation and water injection. Contact 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.