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A method of inhibiting scale in a subterranean formation comprises pretreating the subterranean formation with a polyquaternary amine that serves as a squeeze life extension (SLE) agent, and then introducing a scale inhibitor pill into the subterranean formation, wherein the scale inhibitor pill inc

A method of inhibiting scale in a subterranean formation comprises pretreating the subterranean formation with a polyquaternary amine that serves as a squeeze life extension (SLE) agent, and then introducing a scale inhibitor pill into the subterranean formation, wherein the scale inhibitor pill includes one or more scale inhibitor compositions. For example, the polyquaternary amine may be a polymer having up to 5 quaternary amine centers, but is preferably a nonpolymeric diquaternary amine having a molecular weight of from 250 to 500. One such example is 1,3-propandiaminium, 2-hydroxy-N,N,N,N′,N′,N′-hexamethyl-, dichloride. The SLE agent is preferably introduced into the formation in a brine solution having a concentration from 0.1 to 20 weight percent. The SLE agents may be used with a variety of known scale inhibitors and scale inhibitor chemistries.

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1. A composition for use in a spearhead treatment in a subterranean formation and in a wellbore connected thereto, comprising (a) one or more nonpolymeric diquaternary amine salts comprising 2-hydroxy-N-(2-hydroxyethyl), N,N, N′,N′,N′-pentamethyl 1,3-propandiaminium dichloride; or 2-hydroxy-N,N-(2-h

1. A composition for use in a spearhead treatment in a subterranean formation and in a wellbore connected thereto, comprising (a) one or more nonpolymeric diquaternary amine salts comprising 2-hydroxy-N-(2-hydroxyethyl), N,N, N′,N′,N′-pentamethyl 1,3-propandiaminium dichloride; or 2-hydroxy-N,N-(2-hydroxyethyl), N,N′,N′,N′-tetramethyl 1,3-propandiaminium dichloride; and(b) a brine comprising water and one or more salts comprising a sodium halide, a calcium halide, or a magnesium halide, wherein the brine has an electrical conductivity of greater than 0.1 mS/cm. 2. The composition of claim 1, wherein the nonpolymeric diquaternary amine salt has a cation with a molecular weight of from about 170 to 1500. 3. The composition of claim 1, wherein the nonpolymeric diquaternary amine salt is introduced into the formation in a brine solution having a nonpolymeric diquaternary amine salt concentration of from 0.1 to 20 weight percent. 4. The composition of claim 1, wherein the nonpolymeric diquaternary amine salt is thermally stable to 180° C. 5. The composition of claim 1, wherein the nonpolymeric diquaternary amine salt is introduced into the formation in a brine solution having a nonpolymeric diquaternary amine salt concentration of from 0.1 to 20 weight percent. 6. The composition of claim 1, wherein the nonpolymeric diquaternary amine salt is symmetrical. 7. The composition of claim 1, wherein the nonpolymeric diquaternary amine salt is non-symmetrical. 8. The composition of claim 1, further comprising: a scale inhibitor comprised of a scale inhibitor comprising at least one anionic group, a scale inhibitor comprising at least one phosphonate or phosphate ester group, a polymeric scale inhibitor comprising at least one carboxylate, phosphonate, or phosphonate ester group; or a polymeric scale inhibitor derived from monomers of formulae (I) or (II): wherein R3 is CO2Z, SO3Z, PO3Z2, or an alkyl or aryl group substituted with at least one CO2Z, SO3Z or PO3Z2 group in which Z is a hydrogen atom or a univalent metal atom; and R4, R5 and R6 are each independently hydrogen, a substituted or unsubstituted alkyl or aryl group having from 1 to 8 carbon atoms, or an R3 group. 9. The composition of claim 8, wherein the cation in the nonpolymeric diquaternary amine has a molecular weight of from about 170 to 1500. 10. The composition of claim 8, wherein the nonpolymeric diquaternary amine is introduced into the formation in a brine solution having a nonpolymeric diquaternary amine concentration of from 0.1 to 20 weight percent. 11. The composition of claim 8, wherein the nonpolymeric diquaternary amine is thermally stable to 180° C. 12. The composition of claim 8, wherein the nonpolymeric diquaternary amine is symmetrical. 13. The composition of claim 8, wherein the nonpolymeric diquaternary amine is non-symmetrical. 14. The composition of claim 8, wherein the scale inhibitor is a phosphonate. 15. The composition of claim 8, wherein the scale inhibitor is a polymeric scale inhibitor. 16. The composition of claim 8, wherein the scale inhibitor comprises BHMT phosphonate, DETA phosphonate, a phosphorus-containing polycarboxylate, a phosphorus-containing polymer, or a sulfonated polyacrylate.