Patent US1904450A successfully refreshed from Google Patents.
Patent US4350600A successfully refreshed from Google Patents.
US4350600A
Expired / Lapsed
US
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Method and composition for inhibiting corrosion in high temperature, high pressure gas wells
Assignee: BP Corp North America Inc
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Filing: 1979-05-29
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Granted: 1982-09-21
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Expires: 1999-05-29
Abstract
Abstract A relatively nonvolatile, high molecular weight corrosion inhibitor and inhibitor carrier produced by activating a dialkyl disulfide oil by the addition of a relatively high molecular weight aliphatic amine (e.g., a fatty amine, particularly the N-alkyl-1,3-propane diamines) and optionally further increasing the molecular weight by the addition of elemental sulfur, which exhibits corrosion inhibition on its own and in combination with a conventional oil base corrosion inhibitor additive. Such a composition is particularly useful in sustaining a liquid film forming phase at bottomhole conditions for high temperature, high pressure gas wells wherein essentially no petroleum condensate phase exists.
Inventors
- 👤 Shelby P. Sharp
- 👤 Lyman Yarborough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:28
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/54; C23; C23F; C23F11/00; C23F11/08; C23F11/10; Y; Y10; Y10S; Y10S166/00; Y10S166/902; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
110 words
A method for inhibiting corrosion in a high temperature, high pressure gas well, characterized in that an aqueous or brine phase is present, but no petroleum condensate phase exists at a bottomhole conditions, involving the steps of: (a) producing a corrosion inhibiting composition capable of existing in a liquid phase at said bottomhole conditions comprising a dialkyl disulfide to which has been added a high molecular weight amine having from about 12 to 30 carbon atoms in a quantity in excess of about 30 parts by weight fatty amine per 100 parts by weight dialkyl disulfide, and (b) injecting said corrosion inhibiting composition into said gas well to inhibit corrosion.
Claim 2
Independent Claim
110 words
A method for inhibiting corrosion in a high temperature, high pressure gas well, characterized in that an aqueous or brine phase is present, but no petroleum condensate phase exists at a bottomhole conditions, involving the steps of: (a) producing a corrosion inhibiting composition capable of existing in a liquid phase at said bottomhole conditions comprising a dialkyl disulfide to which has been added a high molecular weight amine having from about 12 to 30 carbon atoms in a quantity in excess of about 30 parts by weight fatty amine per 100 parts by weight dialkyl disulfide, and (b) injecting said corrosion inhibiting composition into said gas well to inhibit corrosion.
Claim 3
Dependent Claim
29 words
A method for inhibiting corrosion according to claim 1 wherein said composition has elemental sulfur added to further increase the molecular weight and decrease the volatility of said composition.
Claim 4
Dependent Claim
20 words
A method of inhibiting corrosion according to claim 1 or claim 2 wherein said composition contains an oil-soluble corrosion inhibitor.
Claim 5
Dependent Claim
40 words
A method for inhibiting corrosion according to claim 1 or claim 2 wherein said amine is a N-alkyl-1,3-propane diamine and said alkyl disulfide is a mixture of dialkyl disulfide wherein the alkyl radical contains from 2 to 11 carbon atoms.
Claim 6
Dependent Claim
70 words
A composition capable of existing in a liquid phase and inhibiting corrosion in a high temperature, high pressure well comprising a dialkyl disulfide to which has been added a high molecular weight fatty amine having from about 12 to 30 carbon atoms in a quantity in excess of about 30 parts by weight amine per 100 parts per weight dialkyl disulfide and an effective amount of an oil-soluble corrosion inhibitor.
Claim 7
Dependent Claim
70 words
A composition capable of existing in a liquid phase and inhibiting corrosion in a high temperature, high pressure well comprising a dialkyl disulfide to which has been added a high molecular weight fatty amine having from about 12 to 30 carbon atoms in a quantity in excess of about 30 parts by weight amine per 100 parts per weight dialkyl disulfide and an effective amount of an oil-soluble corrosion inhibitor.
Claim 8
Dependent Claim
24 words
A composition of claim 5 wherein elemental sulfur has been added to further increase the molecular weight and decrease the volatility of said composition.
Claim 9
Dependent Claim
40 words
A composition of claim 5 or claim 6 wherein said high molecular weight fatty amine is a N-alkyl-1,3-propane diamine and said dialkyl disulfide is a mixture of dialkyl disulfides wherein the alkyl radical contains from 2 to 11 carbon atoms.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-20 | 1986-03-22 | 1986-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-20 | 1990-03-22 | 1990-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-20 | 1994-03-22 | 1994-09-21 | $7700.00 | Window Closed / Lapsed |