US3764530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition and process for the reduction of thermal degradation of aqueous drilling fluids
Assignee: Milchem Inc
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Filing: 1972-03-15
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Granted: 1973-10-09
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Expires: 1992-03-15
Abstract
Abstract The present invention relates to a composition and process for the substantial reduction of thermal degration of aqueous drilling fluids and additives thereto by utilizing non-halogencontaining acrylic acid polymers or alkali metal or ammonium salts thereof having a weight average molecular weight no greater than about 2,500, said polymer being added to said drilling fluid in an amount from about 1 ppb to about 6 ppb.
Inventors
- 👤 P Burland
- 👤 J Stephenson
- 👤 E Stobart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:41
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24; Y; Y10; Y10S; Y10S526/00; Y10S526/932
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
The aqueous drilling fluid of Claim 1 wherein the said homopolymer is sodium polyacrylate.
Claim 2
Dependent Claim
14 words
The aqueous drilling fluid of Claim 1 wherein the said clayey material is bentonite.
Claim 3
Dependent Claim
91 words
In the process of drilling a subterranean well wherein there is circulated in the borehole of said well an aqueous drilling fluid containing suspended clayey material, the step of reducing the thermal degradation of said fluid which comprises admixing with said fluid from about 1 ppb to about 6 ppb of a non-halogen-containing acrylic acid homopolymer or a salt thereof selected from the class consisting of alkali metals and ammonium, said homopolymer having a weight average molecular weight of no more than about 2,500, and circulating said fluid throughout said well.
Claim 4
Dependent Claim
12 words
The process of Claim 4 wherein the said homopolymer is sodium polyacrylate.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |