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Anticorrosion measures for petroleum casing

1, First of all, do a good job of water quality standards, strict water quality testing and management. The implementation of cleaning and distributive injection shall be carried out to strengthen the cleaning work of the main water pipeline so that the water quality in the station and the bottom of the well can be up to standard, and the introduction of the corrosion source into the annular space can be reduced;

2. For the water injection wells that have been newly put into production, an annular protection liquid mainly composed of dosing and sterilization shall be adopted, and a system shall be established for regular dosing;

3. In view of the accelerated effect of mechanical abrasion on the corrosion of petroleum casing, it is recommended to add a rubber ring on the coupling of the oil pipe or add a centralizer at the serious part of the well to avoid the tubing scratching the casing during the operation process and the water injection process. One side contact sleeve;

4. In view of the serious corrosion of bacteria under the scale and the slow growth and killing of SRB at high temperatures, it is possible to inject 100 degrees Celsius of high-temperature water or steam into the annulus periodically to kill the SRB.

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

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