The destruction of the borehole structure of oil fields and water wells not only affects the normal production of damaged wells, but also affects the normal development of adjacent wells and even blocks, posing a great threat to the stable production of the entire oil field.
Cathodic Protection Technology for Oil Well Casing: Cathodic Protection Technology
There are two types: sacrificial anode cathodic protection and forced current (impressed current) cathodic protection.

Sacrificial anode cathodic protection technology:

Sacrificial anode cathodic protection technology is to use a metal or alloy with a potential more negative than the metal to be protected to electrically connect with the metal to be protected, relying on the current generated by the metal with a greater potential to continuously corrode and dissolve to protect other metals.

As a sacrificial anode material, it must meet the following requirements: ① It must have a sufficiently negative stable potential; ② The self-corrosion rate is small, the corrosion is uniform, and the current efficiency is high and stable; ③ The electrochemical equivalent is high, that is, the current generated per unit weight is large and the flow rate is large. ④ The anode polarization should be small during work, and the product is easy to fall off. ⑤ The corrosion products do not pollute the environment and are harmless. ⑥ The raw materials are widely available, easy to process, and low in price. Forced current cathodic protection technology. The forced current method is to transfer the cathode current directly from the external DC power supply to the metal to be protected, so that the metal to be protected becomes the cathode to achieve the purpose of cathodic protection.

According to the solubility of the anode, the auxiliary anode can be divided into three categories: soluble anode (such as steel, aluminum), slightly soluble anode (such as high silicon cast iron, graphite) and insoluble anode (such as platinum, platinum plating and metal oxides). The DC power supply is the power supply used for forced current. Its basic requirements are stable and reliable, can run continuously for a long time, and adapt to various environmental conditions.
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