Metal corrosion is a very common phenomenon in oil fields. The causes of metal corrosion include CO2, H2S, acid pickling, and acidizing, with acidizing being the most serious cause. Acidizing is an effective measure for increasing production in oil and gas wells and enhancing injection in injection wells. However, acid solutions are corrosive to metals, making it necessary to add a certain amount of acid corrosion inhibitor. Currently, the main components of commonly used acid corrosion inhibitors include quaternary ammonium salts, Mannich bases, imidazolines, and ketoamines. Among these, quaternary ammonium salts have good solubility and performance, giving them broad application prospects.
Currently, the main raw materials used in the market are quinoline and pyridine, which react with different quaternary ammonium reagents such as benzyl chloride, allyl chloride, and epichlorohydrin to synthesize various quaternary ammonium salt type corrosion inhibitors. Most commercially available quaternary ammonium salt products of this type are mixtures, with few pure monomers. Due to manufacturing processes, the quality of quinoline quaternary ammonium salt products varies considerably.
Our company primarily utilizes innovative processes, combined with the advantages of our proprietary equipment, and through repeated refinement, has developed patented technologies that mitigate reaction risks and reduce side reactions. As a result, the quinoline quaternary ammonium salts we produce have significantly higher effective content than similar products on the market.
The corrosion inhibition performance was evaluated using the methods for static corrosion rate and inhibition efficiency specified in SY/T5405-2019 "Test Methods and Evaluation Indices for Corrosion Inhibitors Used in Acidizing". The weight loss method was used for testing, which offers strong simulation capabilities, reliable results, and a direct and simple measurement method.
The test specimens used were N80 steel coupons, with dimensions of 50mm x 10mm x 3mm and a hole diameter of 6mm. They were polished with waterproof sandpaper and metallographic sandpaper, cleaned with anhydrous ethanol and acetone, and weighed after drying. A hydrochloric acid solution was prepared, and then a corrosion inhibitor solution of a specific concentration was prepared using the hydrochloric acid solution. This solution was poured into a corrosion bottle. The steel specimens were then suspended in the corrosion inhibitor solution using nylon string (the ratio of corrosion inhibitor solution volume to steel specimen surface area was 20mL:1cm²). Finally, the corrosion bottle was placed in a constant-temperature water bath. After four hours at the experimental temperature, the steel specimens were removed, cleaned to remove corrosion products, dried to constant weight, and accurately weighed to calculate the corrosion rate.
The results show that benzyl quinolinium chloride exhibits good corrosion inhibition performance in acidic solutions. Furthermore, at a certain inhibitor concentration, the corrosion rate of N80 steel sheets increases and the inhibition effect weakens with increasing corrosion temperature. It can essentially meet the 5405 standard requirements below 120°C.
In addition, Bolachem's self-developed propargyl alcohol propoxylate intensifier, a new generation of acid corrosion inhibitor concentrate and enhancer, is a green and environmentally friendly alternative to propargyl alcohol. Compared with traditional corrosion inhibitors, it offers excellent cost-effectiveness, high performance-to-price ratio, and is non-corrosive and non-toxic, possessing superior toxicological and ecological advantages. It can be used alone as a corrosion inhibitor at low temperatures, and can be combined with various types of corrosion inhibitors to produce synergistic effects at high temperatures. Using the same testing method, a high-temperature corrosion inhibitor was formulated with benzyl chloride quinoline salt as the main component and propargyl alcohol propoxylate as the auxiliary component in a certain proportion. The test results basically met the 160℃ 5405 standard requirements.
Wuhan Bolachem New Material Co., Ltd. , as an innovative technology company, it is focusing on the research and development, industrialization and technology application of advanced materials.Bolachem provides a full range of acetylenic diol surfactants, silicone surfactants, water-based additives products. We are committed to the development and application services of water-based coatings, photovoltaic cutting, new energy and other fields of product. With a professional doctoral research and development team at home and abroad, a perfect R & D and application service system, and an advanced cooperative production base, we are looking forward to be your cooperation partner to create double-win. Friends from all walks of life are welcome to visit, provide guidance and negotiate business.
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