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Anticorrosion Measures of Oil Casing Pipe

Posted by: Time:2017.05.10 20:38

Oil casing pipe is a steel pipe that used to support the oil and gas well wall, to ensure that the drilling process and after the completion of the normal operation of the entire oil well. Each well according to different drilling depth and geological conditions, to use a fewlayers of casing pipes. After the casing pipe well, it should be used withcement, which is different from the tubing and drill pipe, and can not be usedrepeatedly, which belongs to one time consuming material. Therefore, the consumption of the casing pipe accounted for more than 70% of all.

Oil casing steel grade: H40, J55, K55, N80,L80, C90, T95, P110, Q125, V150, etc.. The end of the casing processing forms:short round thread, long thread, buttress thread, special buckle etc..

Anticorrosion measures of oil casing

1 . First do a good job of water qualitystandards, strict water quality testing and management. The implementation ofthe clean water injection, to strengthen the main water pipeline cleaning work,so that the station within the bottom of the water quality standards, reducethe erosion of the introduction of ring space;

2. On the newly put into operation of thewater injection well, take to add the sterilization based annulus protectionliquid, and the formation of the system, regular investment plus;

3. In view of the mechanical abrasion ofoil casing corrosion acceleration effect, it is recommended in tubing hoop witha rubber ring or add a centralizer in the severe deviation location, to avoidin the operation process and the process of water injection tubing scrapeinjury casing and contacts to one side of the casing;

4. In the case of severe bacterialcorrosion under the scale and high temperature SRB slow growth and kill, can beregularly to the ring air injection of 100 degrees Celsius water or water vaporto kill the scale of SRB;

5. The corrosion of the casing in waterinjection well is not under effective control, and is not recommended topromote the use of cathodic protection and coating.

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