Electron transfer system for well acidizing compositions and methods
AssigneeHalliburton Energy Services, Inc.
InventorMichael M. Brezinski
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Abstract
An acidizing composition and a method of acidizing a hydrocarbon bearing subterranean formation in the presence of ferric ions are provided. The acidizing composition includes a mineral acid solution, an electron donor agent, a primary electron transfer agent and a secondary electron transfer agent. The primary electron transfer agent is a source of vanadium ions. The secondary electron transfer agent is a source of iodide ion or iodine. The electron donor agent and primary and secondary electron transfer agents function together to reduce ferric ion present in the mineral acid solution to ferrous ion which in turn prevents ferric hydroxide and/or free sulfur from precipitating out of the solution and reduces the formation of sludge in crude oil in the formation.
Claims44
An acidizing composition comprising:
- an aqueous mineral acid solution;
- an electron donor agent;
- a primary electron transfer agent, said primary electron transfer agent being a source of vanadium ions;
- and
- a secondary electron transfer agent, said secondary electron transfer agent being selected from the group consisting of a source of iodide ion and a source of iodine, whereby said electron donor agent and said primary and secondary transfer agents function together to reduce ferric ion present in said mineral acid solution to ferrous ion.
An acid composition for treating a hydrocarbon bearing subterranean formation in the presence of ferric ions, ferrous ions and/or sulfides in order to facilitate the recovery of hydrocarbons from the formation, comprising:
- a hydrochloric acid solution;
- an electron donor agent selected from the group consisting of a thiol compound having a carbon chain that includes an oxygen or oxygen containing functional group, hypophosphorous acid, and a hypophosphorous acid precursor;
- a primary electron transfer agent, said primary electron transfer agent being a source of vanadium ions;
- and
- a secondary electron transfer agent, said secondary electron transfer agent being selected from the group consisting of a source of iodide ion and a source of iodine, whereby said electron donor agent and said primary and secondary transfer agents function together to reduce ferric ion present in said hydrochloric acid solution to ferrous ion.
An industrial equipment cleaning solution, comprising:
- a hydrochloric acid solution;
- an electron donor agent selected from the group consisting of a thiol compound having a carbon chain that includes an oxygen or oxygen containing functional group, hypophosphorous acid, and a hypophosphorous acid precursor;
- a primary electron transfer agent, said primary electron transfer agent being a source of vanadium ions;
- and
- a secondary electron transfer agent, said secondary electron transfer agent being selected from the group consisting of a source of iodide ion and a source of iodine, whereby said electron donor agent and said primary and secondary transfer agents function together to reduce ferric ion present in said hydrochloric acid solution to ferrous ion.
A method of treating a subterranean formation, comprising:
- contacting the formation with an acidizing composition, said acidizing composition including:
- an aqueous mineral acid solution;
- an electron donor agent;
- and
- a primary electron transfer agent, said primary electron transfer agent being a source of vanadium ions;
- and
- a secondary electron transfer agent, said secondary electron transfer agent being selected from the group consisting of a source of iodide ion and an source of iodine, whereby said electron donor agent and said primary and secondary electron transfer agents function together to reduce ferric ion present in said aqueous mineral acid solution to ferrous ion.
Dependencies are inferred from the claim text.