US3880764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer non-dispersed drilling fluids
Assignee: BP America Production Co
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Filing: 1972-11-06
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Granted: 1975-04-29
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Expires: 1992-11-06
Abstract
Abstract Polymer non-dispersed low solids drilling fluids can be prepared to tolerate high calcium and salt concentrations by incorporating therein an effective amount of triamino dihexylene pentakis phosphonic acid, tetramino trihexylene hexakis methylene phosphonic acid, salts thereof, or mixtures of the acids or salts.
Inventors
- 👤 James E Donham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:32
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
63 words
A CONVENTIONAL POLYMER NON-DISPERSED LOW SOLIDS AQUEOUS DRILLING FLUID HAVING INCORPORATED THEREIN AN ADDITIVE SELECTED FROM THE GROUP CONSISTING OF TRIAMINO DIHEXYLENE PENTAKIS METHYLENE PHOSPHONIC ACID AND TETRAMINO TRIHEXYLENE HEXAKIS METHYLENE PHOSPHONIC ACID, THE ALKALI METAL SALTS OF SAID ACIDS AND MIXTURES THEREOF, SAID ADDITIVE BEING PRESENT IN AN AMOUNT EFFECTIVE TO RENDER SAID FLUID STABLE TO CONTAMINATION BY SOLUBLE CALCIUM AND SALTS.
Claim 2
Dependent Claim
63 words
A CONVENTIONAL POLYMER NON-DISPERSED LOW SOLIDS AQUEOUS DRILLING FLUID HAVING INCORPORATED THEREIN AN ADDITIVE SELECTED FROM THE GROUP CONSISTING OF TRIAMINO DIHEXYLENE PENTAKIS METHYLENE PHOSPHONIC ACID AND TETRAMINO TRIHEXYLENE HEXAKIS METHYLENE PHOSPHONIC ACID, THE ALKALI METAL SALTS OF SAID ACIDS AND MIXTURES THEREOF, SAID ADDITIVE BEING PRESENT IN AN AMOUNT EFFECTIVE TO RENDER SAID FLUID STABLE TO CONTAMINATION BY SOLUBLE CALCIUM AND SALTS.
Claim 3
Dependent Claim
32 words
The drilling fluid of claim 1 in which an alkali metal salt of a low molecular weight polyacrylate (not more than about 100, 000) is employed as a fluid loss control material.
Claim 4
Dependent Claim
21 words
The drilling fluid of claim 2 wherein said additive is employed in a concentration of from about 0.05 to 0.5 lb/barrel.
Claim 5
Dependent Claim
28 words
The drilling fluid of claim 2 wherein said additive is a mixture of the two acids having a larger amount of the triamino dihexylene pentakis methylene phosphonic acid.
Claim 6
Dependent Claim
41 words
The drilling fluid of claim 3 wherein said additive contains the two acids in a ratio of from about 3 moles of the triamino dihexylene pentakis phosphonic acid to about 1 mole of the tetramino trihexylene hexakis methylene methylene phosphonic acid.
Claim 7
Dependent Claim
26 words
The drilling fluid of claim 2 in which said alkali metal salt is present in an amount corresponding to from about 0.1 to about 2.0 lbs/barrel.
Claim 8
Dependent Claim
36 words
A method of drilling a well in a formation containing components that normally impart abnormal viscosity to conventional polymer non-dispersed low solids mud, comprising circulating in said well, while drilling, the drilling fluid of claim 1.
Claim 9
Dependent Claim
46 words
A method of drilling a well in a formation containing anhydrite and inorganic chlorides in an amount sufficient to produce an abnormally high viscosity in a conventional polymer non-dispersed low solids drilling fluid, comprising circulating in said well, while drilling, the drilling fluid of claim 2.
Claim 10
Dependent Claim
46 words
A method of drilling a well in a formation containing anhydrite and inorganic chlorides in an amount sufficient to produce an abnormally high viscosity in a conventional polymer non-dispersed low solids drilling fluid, comprising circulating in said well, while drilling, the drilling fluid of claim 4.
Claim 11
Dependent Claim
46 words
A method of drilling a well in a formation containing anhydrite and inorganic chlorides in an amount sufficient to produce an abnormally high viscosity in a conventional polymer non-dispersed low solids drilling fluid, comprising circulating in said well, while drilling, the drilling fluid of claim 5.
References Cited (Backward Citations)
US3081260A
Cited
US3338320A
Cited
US3323603A
Cited
US3434970A
Cited
US3346488A
Cited
US3472325A
Cited
US3654151A
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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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |