Corrosion inhibitors for use in oil and gas wells and similar applications
OwnerShyam Kumar Verma, George Robert Sandorinventors
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Abstract
Anti-corrosion additives and processes useful for oil drilling and similar applications. Heteropoly complex anions of transitional metal elements can be added to an oil well drilling solution which includes a metallic salt, optionally in combination with transition metal compounds or compounds of the metallic elements of Groups IIIa to VIa of the Periodic Table of Elements, to minimize corrosion of systems within which the solution is used.
Claims76
A solution having corrosion inhibiting properties useful in oil and gas well drilling systems and similar applications, the solution comprising:
- an aqueous solution comprising at least one transition metal salt, at least one alkaline earth metal salt, or a mixture thereof;
- and
- at least one heteropoly complex anion of a transition metal element present in an amount sufficient to provide a corrosion inhibiting effect.
A solution having corrosion inhibiting properties useful in oil and gas well drilling systems and similar applications, the solution comprising:
- at least one salt selected from the group consisting of first transition metal salts, alkaline earth metal salts, and mixtures thereof;
- at least one heteropoly complex anion of a transition metal element;
- and
- at least one additional corrosion inhibiting agent selected from the group consisting of transition metal salts which are different from said first transition metal salts, salts of the metallic elements of Groups IIIa to VIa of the Periodic Table of Elements, and mixtures thereof,
- said heteropoly complex anion and said additional additive present in an amount sufficient to provide a corrosion inhibiting effect.
An aqueous completion fluid for oil and gas well drilling systems having corrosion inhibiting properties, comprising at least one zinc halide, at least one calcium halide, or a mixture thereof;
- at least one phosphomolybdate;
- and at least one halide of the metallic elements of Group Va of the Periodic Table of Elements, said phosphomolybdate and said Group Va halide present in an amount sufficient to provide a corrosion inhibiting effect.
A solution having corrosion inhibiting properties useful in oil and gas well drilling systems and similar applications, the solution comprising:
- an aqueous solution comprising at least one transition metal salt, at least one alkaline earth metal salt, or a mixture thereof;
- and
- at least one corrosion inhibiting agent comprising at least one compound of the metallic elements of Groups IIIa to VIa of the Periodic Table of Elements.
A solution having corrosion inhibiting properties useful in oil and gas well drilling systems and similar applications, the solution comprising at least one zinc halide, at least one calcium halide, or a mixture thereof;
- and at least one halide of the metallic elements of Group Va of the Periodic Table of Elements in an amount sufficient to provide a corrosion inhibiting effect.
A process for inhibiting the corrosion of metal surfaces in oil and gas well drilling systems and similar systems employing an aqueous completion fluid, the process comprising contacting the metal surfaces with at least one heteropoly complex anion of a transition metal element in an amount sufficient to provide a corrosion inhibiting effect.
A process for inhibiting the corrosion of metal surfaces in oil and gas well drilling systems and similar systems employing an aqueous completion fluid, the process comprising contacting the metal surfaces with at least one at least one compound of the metallic elements of Groups IIIa to VIa of the Periodic Table of Elements in an amount sufficient to provide a corrosion inhibiting effect.
A process for inhibiting the corrosion of metal surfaces in oil and gas well drilling systems and similar systems employing an aqueous completion fluid, the process comprising providing in a oil or gas well drilling system a corrosion inhibiting solution comprising at least one metallic salt and at least one heteropoly complex anion of a transition metal element, said at least one heteropoly complex anion of a transition metal element present in an amount sufficient to provide a corrosion inhibiting effect.
Dependencies are inferred from the claim text.