Well treatment

A method for the treatment of a subterranean formation which comprises sand particles, said method comprising contacting said formation with a positively charged polymer capable of increasing the residual matrix strength of said sand particles whereby to reduce or prevent their migration while minimizing any decrease in the permeability of said formation, wherein said polymer is selected from polyaminoacids, poly (diallyl ammonium salts) and mixtures thereof and is applied as a dispersion or solution in a liquid carrier at a concentration of 5-50% w/v.

The use for the manufacture of hydrocarbon well treatment compositions (e.g. sand consolidation compositions) of a positively charged polymer capable of increasing the residual matrix strength of sand particles contained within a subterranean formation whereby to reduce or prevent their migration while minimizing any decrease in the permeability of said formation, wherein said polymer is selected from polyaminoacids, poly (diallyl ammonium salts) and mixtures thereof and is applied as a dispersion or solution in a liquid carrier at a concentration of 5-50% w/v.

A hydrocarbon well treatment composition (e.g. a sand consolidation composition) comprising a carrier liquid containing a positively charged polymer capable of increasing the residual matrix strength of sand particles contained within a subterranean formation whereby to reduce or prevent their migration while minimizing any decrease in the permeability of said formation, wherein said polymer is selected from polyaminoacids, poly (diallyl ammonium salts) and mixtures thereof and is applied as a dispersion or solution in a liquid carrier at a concentration of 5-50% w/v.