Corrosion inhibitor for oil field water injection

Oil field water corrosion inhibitor can be used to delay the corrosion of oil field water to metal, so what is its principle of action? They are complex dissolution, lattice distortion, electrostatic repulsion and so on. When we choose it, we also need to choose according to certain rules.

The action principle of oil field waterflood corrosion inhibitor:

1. Complex dissolution

Complexation solubilization is the formation of a negatively charged molecular chain and a water-soluble complex or chelate of Ca2+. The molecular chain is formed by ionizing the copolymer after it is dissolved in water. This kind of complexation can increase the solubility of inorganic salts, so it acts as a scale inhibitor.

2. Lattice distortion

The lattice distortion effect is to block and destroy the normal growth of inorganic salt crystals through some functional groups in the scale inhibitor molecule. This slows the growth of the crystals. Thus reducing the formation of salt scale.

3. Electrostatic rejection

Electrostatic repulsion looks like this. The copolymer is dissolved in water and adsorbed on the microcrystal of inorganic salt. Then the repulsive force between particles is increased. Thus preventing their merger. These particles are placed in a well-dispersed state. Thus preventing or reducing the formation of scale.

Principles of selecting corrosion inhibitor for oilfield water injection:

1. Protected metals Different metals have different chemical, electrochemical and corrosion properties. The corrosive behavior of various metals in different media. Adsorption and passivation characteristics are also very different, and these characteristics of metal materials should be considered when selecting corrosion inhibitors. If the system is composed of iron, copper, aluminum, lead, a variety of metals, then a corrosion inhibitor is difficult to meet the corrosion requirements of all metals, such a system should use a variety of compound corrosion inhibitors.

2. Corrosion media Different types of corrosion inhibitors should be selected for different corrosion media to achieve effective protection of metals. The corrosion mechanism of metals in water with different pH values is different, and the selection of corrosion inhibitors is also different. Inorganic corrosion inhibitors are often used in neutral water media, mainly passivating film type and precipitating film type; In the acid medium, most of the metal corrosion inhibitors are organic compounds, especially the adsorption type.

3. Due to the complex situation of metal corrosion, the use of a single component of corrosion inhibitors is difficult to achieve ideal results. The use effect of a variety of corrosion inhibitors can often be much higher after the combination, which is the synergistic effect of corrosion inhibitors, the mechanism of synergistic effect varies with the corrosion inhibitor system, and its size is related to the type of corrosion inhibitors, but also by the concentration of corrosion inhibitors. The influence of the medium.

4. The overall effect of the use of corrosion inhibitors, in addition to considering the suppression of metal corrosion, should also consider the overall effect during the operation of the system. For example, industrial circulating cooling water will not only cause metal corrosion of cooling pipes, but also reduce the cooling efficiency due to scaling, and increase corrosion due to the reproduction of water organisms, and even cause pipeline blockage.
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