The corrosion of the oil casing is related to the partial pressure of the corrosive gas, the ambient temperature, the water content, the salinity, the flow rate, and the pH value. So what are the anti- corrosion processes for oil casings? Let's take a brief look at: 1. Cement sealing and anti-corrosion technology In the early stage, the main reason for the damage of the casing was that the cement was not able to return high, and the external water layer was not completely sealed, and corrosive gas in the water layer was formed to corrode the surface of the casing to form corrosion. Therefore, in the 1980s, the strategy of increasing the cement height was proposed to increase the corrosion resistance of the casing. After this technique, the corrosion level of the casing is reduced, but the casing corrosion is not completely prevented, so the corrosion resistance of the casing is not raised from the spring source. 2. Use corrosion-resistant alloy pipe Since 2000, the anti-corrosion plan for offshore oil casings has begun to seek treatment plans from materials to improve the corrosion protection of the oil casings, thus completely dealing with the corrosion problems of the oil casings. In the frequency test, through the indoor test, under the conditions of affirmative temperature and pressure conditions and corrosive gas, the Cr-containing pipes such as 1Cr, 3Cr, 9Cr and 13Cr were evaluated, and an anti-corrosion plate suitable for the oil casing of the offshore oil and gas field was developed. 3. Inject corrosion inhibitor From the completion of the completion process, if the formation contains oily corrosive gases, chemical antiseptic agents will be added to the well fluid for anti-scaling, anti-wax and anti-corrosion. Therefore, the use of chemical methods for the corrosion protection of oil casings is also a common means outside China. Depending on the difference in the oil and gas field, it may be possible to use a batch or continuous injection of corrosion inhibitor for corrosion protection. The amount of injection varies depending on the corrosive environment of the oil and gas field. Since the demand for the addition of corrosion inhibitors has continued, on the one hand, the cost is higher, and it will also have a positive impact on the on-site production. 4. Apply anti-corrosion coating tube Regarding oil casings, it is also a useful anti-corrosion method to use anti-corrosion coatings in China to block their infiltration in corrosive gases. Some oilfields use nitriding technology for internal and external corrosion protection of oil pipes, and their wear resistance is good. However, the anti-corrosion method of the inner and outer walls will accelerate the corrosion of the inner wall of the casing at a certain level, and the nitriding pipe will be rough, which will make the oil pipe The knot is tighter than the other types of tubes. In addition, some oil and gas fields use epoxy powder coating, titanium nano coating, epoxy ester phenolic coating to prevent corrosion. Source: Free Articles from ArticlesFactory.com Permanent Steel Manufacturing Co.,Ltd is also a manufacturer of well casing pipes.