| It's well known that decalcification of calcium-enriched crude oil is still atough problem puzzling people. In recent years, the widespread use of tertiaryrecovery technology has given rise to the ever-increasing total metallic icon content in crude oil. Especially the Ca++ of the alkaline-earth metal. The rapid increase in Ca++ content may cause a host of hazards to crude processing andend products.Viewing that, according to the latest domestic and foreign decalcification techniques, such as complex etraction, hydro-catalytic process, membrane separation, CO2, resin, biotechnology, and the like among them.With regard to high Ca++ content in viscous crude in Karamay oilfield,the use of resin and complex extraction techniques to remove the calcium in calcium-enriched viscous crude was examined at laboratory. The factors affecting the performances of calcium removal by complex extraction was reviewed. The results showed that the use of self-developed, unique KR-1 decalcifying agent hasremoved 90.0% Ca++ ions in the viscous crude in Karamay oilfield, so it hasa very promising prospect in industrial use .
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