US4000076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling mud having reduced corrosiveness
Assignee: Drilling Specialties Co
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Filing: 1974-06-14
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Granted: 1976-12-28
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Expires: 1994-06-14
Abstract
Abstract A phosphate added to a drilling mud, e.g., a drilling mud containing a pitting-type or other corrosion producing component such as potassium chloride, significantly reduces corrosiveness and converts any residual corrosiveness to a general, as distinguished from a pitting type.
Inventors
- 👤 Oliver K. Bodine
- 👤 Charles A. Sauber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:57
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
105 words
A process for inhibiting corrosiveness to metal of an aqueous drilling mud containing a clay and a metal corrosive component selected from the group consisting of potassium chloride, sodium chloride, and sodium sulfate which comprises adding at least one soluble phosphate selected from the group consisting of diammonium phosphate, monoammonium phosphate, dipotassium phosphate, monosodium phosphate, monolithium phosphate, and dirubidium phosphate to said mud said soluble phosphate added in an amount in the range of about 0.9 pounds per barrel to about 8 pounds per barrel of the mud composition and maintaining said mud at a pH in the range of about 6 to about 10.
Claim 2
Dependent Claim
105 words
A process for inhibiting corrosiveness to metal of an aqueous drilling mud containing a clay and a metal corrosive component selected from the group consisting of potassium chloride, sodium chloride, and sodium sulfate which comprises adding at least one soluble phosphate selected from the group consisting of diammonium phosphate, monoammonium phosphate, dipotassium phosphate, monosodium phosphate, monolithium phosphate, and dirubidium phosphate to said mud said soluble phosphate added in an amount in the range of about 0.9 pounds per barrel to about 8 pounds per barrel of the mud composition and maintaining said mud at a pH in the range of about 6 to about 10.
Claim 3
Dependent Claim
12 words
A process according to claim 1 wherein the additive is diammonium phosphate.
Claim 4
Dependent Claim
27 words
A process according to claim 1 wherein the corrosive component is potassium chloride present in an amount of from about 3 to about 35 pounds per barrel.
Claim 5
Dependent Claim
21 words
A process according to claim 3 wherein the drilling mud is a bentonite clay drilling mud containing a sodium carboxymethylcellulose polymer.
Claim 6
Dependent Claim
97 words
An improved inhibited non-dispersed aqueous drilling mud maintained at a pH of about 6 to about 10 containing a clay and at least one metal corrosive component selected from the group consisting of potassium chloride, sodium chloride and sodium sulfate, said drilling mud also containing an amount of about 0.9 pounds per barrel to about 8 pounds per barrel of the mud composition of soluble phosphate selected from the group consisting of diammonium phosphate, monoammonium phosphate, dipotassium phosphate, monosodium phosphate, monolithium phosphate, and dirubidium phosphate, said phosphate effective significantly to reduce corrosiveness to metal of said composition.
Claim 7
Dependent Claim
97 words
An improved inhibited non-dispersed aqueous drilling mud maintained at a pH of about 6 to about 10 containing a clay and at least one metal corrosive component selected from the group consisting of potassium chloride, sodium chloride and sodium sulfate, said drilling mud also containing an amount of about 0.9 pounds per barrel to about 8 pounds per barrel of the mud composition of soluble phosphate selected from the group consisting of diammonium phosphate, monoammonium phosphate, dipotassium phosphate, monosodium phosphate, monolithium phosphate, and dirubidium phosphate, said phosphate effective significantly to reduce corrosiveness to metal of said composition.
Claim 8
Dependent Claim
27 words
A mud according to claim 5 wherein the corrosive component is potassium chloride present in an amount. of from about 3 to about 35 pounds per barrel.
Claim 9
Dependent Claim
21 words
A mud according to claim 6 wherein the drilling mud is a bentonite clay drilling mud containing a sodium carboxymethylcellulose polymer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |