| 摘要 |
PURPOSE: To improve the dissolving power and dissolving rate when an asphaltene residue present in an oil well is to be dissolved by preparing a hydrocarbon blend having a compsn. selected from a specified region in a ternary chart of satd. compds., alkylbenzenes and polyaromatic compds. CONSTITUTION: As for this hydrocarbon blend used to dissolve an asphaltene residue present in an oil well, a compd. selected from a specified triangular region in the ternary chart with the vertex A representing 100% of polyaromatic compds. with z<-6, vertex B representing 100% of polyaromatic compds., and the vertex C representing 100% of a alkylbenzene with z=-6. The specified region is defined by lines connecting the vertex A, the point representing 77% of aromatic compds. with z<-6 and 23% of satd. compds. on the side AB, and the point representing 55% of polyaromatic compds. on the side AC. The compsn. having >=150 deg.C initial boiling point is used. Or, the compsn. is selected from the region defined by lines connecting the vertex A representing 100% of polyaromatic compds. with z<-6, the point representing 80% of aromatic compds. on the side AB and the point representing 42% of alkylbenzene on the side AC.
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