Oil casing is the lifeline to maintain the normal operation of oil wells. Because of the different geological conditions, the stress state of the underground is complex, and the tensile, compressive, bending and torsional stresses act on the pipe body together, and the crude oil contains a lot of corrosive substances, and the oil casing is very easy to produce the corrosion. There are some anti-corrosion measures of oil casing following below:
1, Do a good job of water quality standards, strict water quality testing and management. The implementation of clean-up sub-injection, strengthening the main water pipe cleaning work, so that the station, the bottom of water quality standards, to reduce the introduction of corrosion space annular space.
2. Put into operation for the new injection wells, to take the main sterilization to vote for the ring to protect the liquid, and the formation of regular investment dosing.
3. In view of the mechanical abrasion to accelerate the role of corrosion of oil casing, it is recommended in the tubing coupling with a rubber ring or a serious deviation in the well plus a centralizer, to avoid the process and the process of water injection pipe casing and One side contact sleeve.
4. For serious bacteria corrosion and high temperature SRB slow growth and kill the situation, can be periodically injected into the annulus of 100 degrees Celsius high temperature water or water vapor to kill the SRB under the scale. Share from the Hebei Xin joint oil tube.
5. It is not recommended to promote cathodic protection and catalog casing before corrosion in the casing of injection wells is not effectively controlled.
6. You can brush the oil inside and outside the casing wall layer of anti-corrosion coating.
