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What are the main corrosive agents of oil drill pipe steel?
release time：2023-08-25
source： Network
As long as the drill pipe through the drilling bend, even if the tension is eliminated, the accumulation of fatigue damage still exists, so if repeated several times through the drilling bend, it is possible to cause fatigue damage to the drill pipe. It should also be seen that a drill pipe may have been damaged even if there is no accident in a certain well. Therefore. When it is used again in the same well or other wells, although it is connected to the top of the drill string, even if the bending stress acting on the drill pipe is within the rated value, it may not be able to withstand it, resulting in accidents.
In addition, there are other causes of bending stress that can cause pure fatigue failure. For example, any bent drill pipe is often a potential factor for fatigue failure. The bent kelly will bend the first drill pipe below the rotary table. Once the stress on this drill pipe is large enough, it will cause fatigue damage. The misalignment of the crane will also cause fatigue damage to the drill pipe, because it will cause bending stress on the kelly and the drill pipe.
Water-based mud with low PH value will reduce the fatigue life of drilling tools. PH value is the main factor to control corrosion fatigue, but how to accurately determine the minimum pH value sufficient to prevent fatigue damage is difficult. Many users believe that the mud pH below 9.5 will reduce the fatigue life of the drilling tool. Temperature Most of the corrosion rate will increase with the increase of temperature. The rate of corrosion is accelerated by increasing the flow rate of the mud. Inhomogeneity Local differences in steel composition or microstructure can increase the corrosion rate. The corrosion rate of high stress is generally faster in the parts subjected to high stress than in the low stress parts.
This kind of damage is the common reason that makes oil drill pipe break up early at present. Corrosion can cause extremely serious damage in various or several combined forms of damage (erosion, wear, fatigue). Sometimes, several forms of corrosion will occur at the same time, but in general, there is always one form of corrosion as the main cause of damage.
(1) Corrosive The main corrosive agents that affect the steel of drilling tools are: oxygen, carbon dioxide, hydrogen sulfide, dissolved salts (chloride, carbonate and sodium sulfate, calcium, magnesium), and various acids (formic acid, acetic acid, etc.).
(2) Factors affecting the corrosion rate.
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