What are the Reasons for the Damage of the Oil Casing Pipe?

Petroleum casing pipe is widely used in oil field work tasks, so the damage of the oil casing will seriously affect the work of the oil field and greatly reduce the work efficiency. The following oil casing manufacturers take you to learn more about the factors that cause oil casing damage, and hope to avoid the corrosive factors of the oil casing as much as possible in the future.

Inclusions:

Some sandy inclusions will be mixed into the injected water. If the injected water is not filtered, the inclusions in the water will enter the casing with the water flow, causing the gap between the casings to be no longer compact, making the casing Under normal circumstances, the strength of the support is lost in the application link, the internal stress is changed, and the casing is finally damaged.

Under normal circumstances, there is a corresponding relationship between underground pressures, the pressure of the overlying strata = the pressure of the formation crevices + the pressure of the strata framework. The increase of sand will increase the pressure of the rock formation between the casings, resulting in pressure imbalances and subsidence of the formation, which will cause the tubing and casing to bend and deform, causing damage to it.

Corrosion:

Crude oil generally contains corrosion-resistant substances, such as CO2 and nitrides. These substances will inevitably be corrosive to oil casing during operation. In addition, the water injected during the oil extraction process also contains certain corrosion-resistant substances, which will definitely cause corrosion to the casing of the oil field.

Water injection:

In order to effectively ensure a stable oil production rate, oil manufacturers generally inject more water during the oil extraction process. Obviously, considering that there are many cracks or fault structures in the lower layer of the oil well, there is no way to master the water injection volume in the water injection process. Too much water will seep into the cracks or faults in the lower layer of the oil field, and eventually cause corresponding internal stress changes in the lower layer, so that the internal stress experienced by the casing in the lower layer of the oil field will change, and then the internal stress of the oil casing will be unbalanced. When the oil casing cannot withstand the overload internal stress, the oil pipeline cracks and other situations will immediately occur. In addition, the complex topography and characteristics of the bottom of the oil field will also affect the oil casing. More rocks and other materials at the bottom of some oil fields will affect the use of oil casing and bring corresponding effects on the oil casing.

Tips:Petroleum casing pipes can be divided into different steel grades according to the strength of the steel itself, namely J55, K55, N80, L80, C90, T95, P110, Q125, V150, etc. Different well conditions and depths have different steel grades. In corrosive environments, the casing itself is also required to have corrosion resistance, and in places with complex geological conditions, it is also required to have anti-collapse performance.

Steel pipe industry practitioners at Permanent Steel Manufacturing Co.,Ltd, knowledge enthusiasts