DETAILED DESCRIPTION OF THE INVENTION The blend according to the present invention is better explained by referring to the ternary chart of FIG.
1, in which hydrocarbon compositions are represented, which are constituted by saturated species, alkylbenzenes (with z=-6), and polyaromatics (with z<-6).
The vertex (A) of the above said triangle represents 100% of polyaromatics with z<-6, the vertex (B) represents 100% of saturated species, and the vertex (C) represents 100% of alkylbenzenes.
In accordance therewith, a first aspect of the present invention relates to a useful hydrocarbon blend for dissolving asphaltenic residues present in oil wells, characterized in that it is essentially constituted by a composition selected from those comprised, on the ternary chart as defined hereinabove, between: the vertex (A), i.
e.
, 100% of polyaromatics with z<-6; the point along the side AB, corresponding to 77% of polyaromatics with z<-6 and 23% of saturated species, preferably corresponding to 80% and 20%; the point, along the side AC, corresponding to 45% of alkylbenzenes and 55% of polyaromatics with z<-6, preferably 42% and 58%; with the further constraint that the initial boiling point of the above said hydrocarbon blend is higher than 150.
degree.
C.
, preferably than 180.
degree.
C.
The composition of the hydrocarbon blend is better explained by referring to FIG.
1, in which the set of compositions according to the present invention fall within the shaded region.
The data expressed as percent values are by weight/weight.
The parameter "z" is drawn from the general formula C.
sub.
n H.
sub.
2n+z, and expresses the degree of fusion/unsaturation of the hydrocarbon molecule.
So, e.
g.
, in the case of non-naphthenic saturated hydrocarbons z=+2, in the case of benzene and its alkyl derivatives z=-6, in the case of naphthenobenzenes and polyaromatics z<-6.
For the sake of simplicity, in the following, by the expression "saturated species", all unsaturation-free hydrocarbons will be understood, including the naphthenic hydrocarbons having z=0 and z=-2; with the expression "alkylbenzenes", the aromatic hydrocarbons having z=-6, and with the expression "polyaromatics", those having z<-6 will be understood
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Molecular Biology 
