Oil casing corrosion factors

The occurrence of corrosion, mainly refers to the material of the object and the external environment in the process of contact between the two produce a chemical reaction, which will largely lead to the deterioration of the object in contact, and with the passage of time, and ultimately the corresponding destruction of the phenomenon.

1.The main types of oil casing corrosion
In the process of analyzing the type of oil casing corrosion can be seen, caused by corrosion and the type of situation is diverse, but also need to deal with the details, starting from a diverse perspective, analyze the type of corrosion caused by it, so that it can be targeted to explore the reasons for corrosion, as well as to find effective solutions to the strategy.
The first aspect is all aspects of the situation caused by corrosion, refers to the whole process of casing use, corrosion occurs will lead to the thickness of the oil casing itself is reduced, seriously affecting the overall effect of the use of oil casing. Because in the process of actual work, most of the oil casing is actually metal material, metal is often easy to be corroded, after the corrosion of its surface will appear some unevenness. Such a situation seriously affects the subsequent use of the effect, and even lead to a lot of sulfide precipitation inside the oil casing, if there is such a problem is not resolved in a timely manner, then the overall quality of the work of oil extraction will have a certain impact, but also lead to the actual work to carry out the efficiency of the continuous reduction.
The second aspect is the emergence of hydrogen bubble corrosion this situation, the main factors that cause this situation contains two aspects: one is the hydrogen atoms appear on the surface of the whole object; on the other hand is the metal itself, the quality of a series of problems still exist. The presence of hydrogen atoms is mainly due to the emergence of hydrogen sulfide, which causes the phenomenon of steel corrosion. Material quality control is also one of the content should not be ignored, the main corrosion process is hydrogen atoms in the oil casing penetration, long-term corrosion caused by non-metallic parts also appeared in the case of hydrogen bubbles.
The third aspect is cracking corrosion. This corrosion situation is very complex factors, the current theory has not achieved good research results. Influenced by a variety of factors, resulting in the cracking of the oil casing affects the normal use.

2.The main causes of corrosion
Internal corrosion
(1) Bacterial corrosion. In the oil casing channel corrosion investigation and research process, corrosion is more common, but also in the investigation of the work most
Concerned about is the corrosion caused by bacteria. Which contains the content of mucus iron, sulfuric acid, bacteria, etc., these bacteria are more common bacteria. In such a bacterial corrosion situation, the sulfate-reducing bacteria will cause more serious losses, and even account for more than half of the overall corrosion rate. The sulfate is transformed into divalent sulfur, and the oil casing in the process of iron chemical reaction, but also gradually appear black, into other chemical elements, which will also cause relatively serious corrosion of the oil casing. Such a corrosion principle is the bacteria retest, which internal corrosion is also caused by the use of oil casing in the process of encountering problems in the main factors.
(2) dissolved salt corrosion. Dissolved salt corrosion in the process of carrying out this type of corrosion is another factor that has a serious impact on the oil casing, but also the key to cause corrosion.
(3) salt concentration as well as gas. In the actual operation of oil extraction, the salt content in the hot water will also continue to enhance, this time the conductive ability of the oil pipe rescue enhancement, resulting in a certain amount of corrosion of the oil pipe, in addition to the oil pipeline is still a lot of dissolved gases. These gases will be with the continuous flow of hot water, in the pipeline constantly undergoing chemical changes, causing certain corrosion of the oil pipe. At this stage, there are still many causes of corrosion of the oil pipe, the maintenance of the oil pipe caused by many difficulties.
External corrosion
The metal material itself exists in the hardness and strength, will have a direct impact on the final corrosion effect, which is also a cause of external corrosion, in which the higher the strength, corrosion sensitivity will also rise, the material’s hardness is high, then the corrosion of the sensitivity is also to rise.

Coupled with the metal in the process of processing, through the cold processing of metal hardness will be enhanced, and produce a certain amount of stress, which will also lead to deformation of the material, susceptible to corrosion.