External corrosion proof technology of oil field oil water well annular tube

Abstract

The invention relates to an oil field oil water well casing outer corrosion protection technique applied in epoxy cold taping and zinc anode. Its feature is adopting combining technique of using anticorrosion coating and epoxy cold taping to isolate casing outer corrosive medium and affording protecting current for the casing by sacrificed anode polarization. The anticorrosion coating includes epoxy coal pitch and epoxy cold taping. The sacrificed anode is zinc alloy. Each component weight percentages are that Fe 0.0023%, Cu 0.005%, Pb 0.0044%, Si less than 0.01%, Al 0.55%, Cd 0.072%, rest Zn. The standard is 168*142*500. The distributions are that each 100m is one group; each group has five branches, which is set on the casing by locking device. The technique is applied in oil field underground casing corrosion damage, solves the problem that impressed current cathode protection needs power supply.

Description

technical field

[0001] The invention relates to an external anti-corrosion process for oil and water well casings in an oil field using an epoxy cold wrapping tape and a zinc anode. Background technique

[0002] Aiming at the external corrosion of oil and water well casings in oil fields, there are currently three types of external casing anti-corrosion technologies adopted by oil fields at home and abroad: 1. Using 13Cr or more stainless steel alloy casings; 2. Implementing cathodic protection technology; 3. Using cement upward classification cementing technology.

[0003] Among them: the corrosion resistance of stainless steel alloy casing above 13Cr is good, but the price is expensive, and it does not meet the low-cost development requirements of low-yield oil and water wells; the cathodic protection technology is mature and widely used at home and abroad. The main problem is that the protection effect depends on management and parameter control. The maintenance workload...

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