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Corrosion inhibitor for Oil and gas gathering and transferring system

The corrosion Oil and gas gathering and transferring system are mainly from carbon dioxide, hydrogen sulfide and water.
In oil gas production, carbon dioxide is mainly from wells. At the situation of water and water film, carbon dioxide can soluble in water to form carbonic acid. The solubility of carbon dioxide in water and saline will increase with the increased pressure. The solubility will decrease with the increased concentration and temperature. At this way, on the top of oil gas well, with the larger quantity solution of carbon dioxide the PH value of water solution will increase, and further corrode the equipments by acid. Recent research shows that the corrosion of carbon dioxide is much serve than we can imagine. Because in the same PH value ,the total acidity of carbon dioxide is higher than hydrochloric acid, the corrosion rate caused is higher than same concentration strong acid. Therefore control the corrosion of carbon dioxide is very important.
The corrosion inhibitor for carbon dioxide usually choose the adsorption film type corrosion inhibitor,the main types are organic amine , Alkynyl alcohols, tetrahydroglyoxaline, nitrogen(N), sulphur(S), phosphorus(P) and condensed nucleus compound. America usually adopts tetrahydroglyoxaline type corrosion inhibitor, because tetrahydroglyoxaline has no compatibility and volatility problems. The using amount of tetrahydroglyoxaline is 90% of Carbon dioxide corrosion inhibitor.
China has made a wide research on the Carbon dioxide corrosion inhibitor, and has developed thiourea, amide, and quaternary ammonium salt and tetrahydroglyoxaline corrosion inhibitor. Hydrogen sulfide corrosion is different from carbon dioxide one, it not only has sour corrosion on the steels, but also can produce hydrogen atom to result hydrogen embrittlement of steel.