Compositions and methods of catalyzing the rate of iron reduction during acid treatment of wells
AssigneeBJ Services Company
InventorsMagdy Girgis-Ghaly, John R. Delorey
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Abstract
Methods and compositions for preventing precipitation of iron compounds during acid treatments of wells by catalyzing the rate of iron reduction during such treatments. Reduction of ferric ions is accelerated utilizing co-catalytic amounts of antimony ions in combination with other materials to minimize precipitation and other complications which result from iron compounds during acid treatments. Such other materials may include co-catalytic amounts of copper ions and optional iodide ions; as well as at least one of phosphinic acid, salt of phosphinic acid, or a mixture thereof.
Claims28
A method of treating a well, comprising introducing a well treatment fluid into said well, said well treatment fluid comprising:
- treatment acid;
- at least one of phosphinic acid, salt of phosphinic acid, or a mixture thereof,
- source of antimony ions;
- and
- source of copper ions;
- wherein said antimony ions and said copper ions are present in said well treatment fluid in amounts effective to co-catalyze reduction of ferric iron to ferrous iron.
A method of treating a well with a well treatment fluid, comprising:
- combining to form a well treatment fluid:
- treatment acid,
- at least one of phosphinic acid, a salt of phosphinic acid, or a mixture thereof,
- source of trivalent or pentavalent antimony ions,
- source of cuprous or cupric ions;
- and
- introducing said well treatment fluid into said well;
- wherein said antimony ions and said copper ions are present in said well treatment fluid in amounts effective to co-catalyze reduction of ferric iron to ferrous iron;
- and
- wherein said well penetrates a subterranean formation and oil is present within at least one of said well or said subterranean formation;
- wherein said phosphinic acid, salt of phosphinic acid, or mixture thereof is soluble in said acid used for treating said formation and does not form a precipitate during said well treatment;
- and wherein said source of trivalent or pentavalent antimony ions and said source of cuprous or cupric ions are in a form soluble in said treatment acid and are combined with said treatment acid as salts which do not form a sludge or precipitate with said oil in said subterranean formation.
The method of claim 13, wherein said source of trivalent antimony ions comprises antimony acetate, antimony trichloride, antimony potassium tartrate, or a mixture thereof;
- and wherein said source of pentavalent antimony ions comprises potassium pyroantimonate, antimony pentachloride, or a mixture thereof.
The method of claim wherein 13, said treatment acid is at least one of 1-34% hydrochloric acid, hydrofluoric acid, acetic acid, formic, sulfamic acid, phosphoric acid, or a mixture thereof.
A method of treating a well with a well treatment fluid, comprising
- combining to form a well treatment fluid:
- treatment acid comprising at least one of 1-34% hydrochloric acid, hydrofluoric acid, acetic acid, formic acid, sulfamic acid, phosphoric acid, or a mixture thereof;
- from about 2 Kg to about 100 Kg per cubic meter of well treatment fluid of at least one of phosphinic acid, a salt of phosphinic acid, or a mixture thereof that is soluble in said acid and which does not form a precipitate during said treating of said well;
- from about 0.5% to about 40% by weight of the total weight of phosphinic acid and phosphinic acid equivalent of any phosphinic acid salt present, of a source of antimony ions that is at least one of antimony acetate, antimony trichloride, antimony pentachloride, potassium pyroantimonate, potassium antimony tartrate, or a mixture thereof;
- from about 0.5% to about 40% by weight of the total weight of phosphinic acid and phosphinic acid equivalent of any phosphinic acid salt present, of a source of copper ions that is at least one of CuSO4, CuCl2, CuCl, or a mixture thereof;
- and
- introducing said well treatment fluid into said well.
The method of claim wherein 23, said source of antimony ions is antimony acetate, potassium pyroantimonate, or a mixture thereof;
- and wherein said source of copper ions is CuSO4.
Dependencies are inferred from the claim text.