Well treatment composition for use in iron-rich environments

An aqueous composition comprising:

• a first ingredient selected from the group consisting of sodium and potassium ferrocyanide and mixtures thereof;
• a second ingredient selected from the group consisting of a phosphonic acid, alkali and alkaline earth metal salts of a phosphonic acid, and mixtures thereof;
• and
• from about 1-10% sodium citrate by weight based on the total weight of the solution being 100%,
• said first and second ingredients being dispersed in an aqueous medium.

A composition comprising:

• a first ingredient selected from the group consisting of sodium and potassium ferrocyanide and mixtures thereof;
• and
• a second ingredient selected from the group consisting of a phosphonic acid having the formula:
• where x is from 2 to 6, alkali and alkaline earth metal salts of said phosphonic acid, and mixtures thereof,
• said composition being in the form of a powder dispersible in an aqueous medium to give a pH of from about 6-14.

An aqueous composition comprising:

• a first ingredient selected from the group consisting of sodium and potassium ferrocyanide and mixtures thereof;
• and
• a second ingredient selected from the group consisting of a phosphonic acid having the formula
• where x is from 2 to 6, alkali and alkaline earth metal salts of said phosphonic acid, and mixtures thereof;
• and
• from about 1-10% sodium citrate by weight based on the total weight of the solution being 100%,
• said first and second ingredients being dispersed in an aqueous medium.

A method of treating a system characterized by the presence of iron deposits, said method comprising the steps of:

• providing an aqueous treating composition comprising a first ingredient selected from the group consisting of sodium and potassium ferrocyanide and mixtures thereof, and a second ingredient selected from the group consisting of a phosphonic acid, alkali and alkaline earth metal salts of a phosphonic acid, and mixtures thereof,
• said first and second ingredients being dispersed in an aqueous medium;
• and
• introducing said aqueous composition into said system.

A method of treating a system characterized by the presence of iron deposits, said method comprising the steps of:

• providing an aqueous treating composition comprising a first ingredient selected from the group consisting of sodium and potassium ferrocyanide and mixtures thereof, and a second ingredient selected from the group consisting of a phosphonic acid having the formula
• where x is from 2 to 6, alkali and alkaline earth metal salts of said phosphonic acid, and mixtures thereof,
• said first and second ingredients being dispersed in an aqueous medium;
• and
• introducing said aqueous composition into said system.

An aqueous composition comprising:

• a first ingredient selected from the group consisting of sodium and potassium ferrocyanide and mixtures thereof;
• a second ingredient selected from the group consisting of a phosphonic acid, alkali and alkaline earth metal salts of a phosphonic acid, and mixtures thereof;
• and
• from about 1-10% sodium erythorbate by weight based on the total weight of the solution being 100%
• said first and second ingredients being dispersed in an aqueous medium.

An aqueous composition comprising:

• a first ingredient selected from the group consisting of sodium and potassium ferrocyanide and mixtures thereof;
• a second ingredient selected from the group consisting of a phosphonic acid, alkali and alkaline earth metal salts of a phosphonic acid, and mixtures thereof;
• and
• from about 10-40% ethylene glycol by weight based on the total weight of the solution being 100%,
• said first and second ingredients being dispersed in an aqueous medium.

An aqueous composition comprising:

• a first ingredient selected from the group consisting of sodium and potassium ferrocyanide and mixtures thereof;
• and
• a second ingredient selected from the group consisting of a phosphonic acid having the formula
• where x is from 2 to 6, alkali and alkaline earth metal salts of said phosphonic acid, and mixtures thereof;
• and
• from about 1-10% sodium erythorbate by weight based on the total weight of the solution being 100%,
• said first and second ingredients being dispersed in an aqueous medium.

An aqueous composition comprising:

• a first ingredient selected from the group consisting of sodium and potassium ferrocyanide and mixtures thereof;
• and
• a second ingredient selected from the group consisting of a phosphonic acid having the formula
• where x is from 2 to 6, alkali and alkaline earth metal salts of said phosphonic acid, and mixtures thereof;
• and
• from about 10-40% ethylene glycol by weight based on the total weight of the solution being 100%,
• said first and second ingredients being dispersed in an aqueous medium.