Anti-corrosion Measures for Oil Casing in Industrial Projects

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

2. For newly commissioned water injection wells, adopt annular protection fluid mainly for sterilization, and form a system to add it regularly;

3. Given the accelerated effect of mechanical abrasion on the corrosion of oil casing, it is recommended to add a rubber ring to the tubing coupling or a centralizer to the part with serious well deviation to avoid the tubing from scratching the casing and contacting the casing on one side during the operation and water injection process;

4. Given the serious corrosion of bacteria under the scale and the slow growth and killing of SRB at high temperatures, 100 degrees Celsius high-temperature water or water vapor can be regularly injected into the annulus to kill the SRB under the scale;

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