Common sense of erw casing

ERW casing is a large diameter pipe, play a fixed oil and natural gas wells or wells role. The casing is inserted into the wellbore and fixed with cement to prevent the wellbore from separating the formation and the borehole from collapsing and ensuring that the drilling mud circulates in order to facilitate drilling.

The different types of bushings used in the oil extraction process: the surface of erw casing protects the wells from shallow water and shallow air, supports the wellhead equipment and maintains the other layers of the casing. Technical erw casing to separate the pressure at different levels, so that the amount of normal drilling fluid circulation and protection of production casing. In order to install anti-bursting devices, leak-proof devices and tail pipes in the drilling. The oil-bearing casing exports oil and natural gas from the storage layer beneath the surface. Used to protect the wells and stratify the drilling mud. ERW casing production, the outer diameter is usually 114.3 mm to 508 mm.

Anti - corrosion measures of erw casing
1. First, do a good job of water quality standards, strict water quality testing and management. The implementation of clean-up dispensing, to strengthen the main water pipe cleaning work, so that the station, bottom water quality standards, reduce the introduction of annular space corrosion source;

2. To the newly put into operation of the injection wells, to take the sterilization-based ring protection liquid, and the formation of a system,

3. In view of the fact that mechanical abrasions have accelerated the corrosion of erw casing, it is advisable to add a rubber ring to the tubing couplings or to add a centralizer to the severe parts of the well to avoid damage to the tubing during the operation and during water injection. One side contact sleeve;

4. For severe bacterial corrosion and high temperature SRB growth slow and kill the situation, can be periodically injected into the ring 100 degrees celsius high temperature water or water vapor to kill the scale under the SRB;

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