US4087365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Super-yield bentonite base drilling fluid
Assignee: Amcol International Corp
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Filing: 1976-06-08
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Granted: 1978-05-02
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Expires: 1996-06-08
Abstract
Abstract A super-yield bentonite base drilling fluid composition is provided having a yield of more than 500 barrels per ton of bentonite, comprising water, bentonite clay, and a partial calcium salt of polyacrylic acid in an amount greater than about 7% by weight based on the total weight of bentonite. The fluid exhibits excellent viscosity, gelation and filtrate loss characteristics at extremely low bentonite levels.
Inventors
- 👤 Arthur G. Clem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:32
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
An aqueous clay base drilling fluid composition comprising water, bentonite clay and a polymer effective in increasing the viscosity of a bentonite clay-water suspension selected from the group consisting of a partial calcium salt of sodium polyacrylate, a partial calcium salt of polyacrylic acid and mixtures thereof, said polymer having about 1 to 15% calcium acrylate moieties wherein the polymer is present in an amount greater than about 7% by weight, based on the total weight of bentonite, wherein each polymer, when added to water in an amount of 1% by weight has a viscosity greater than about 10 centipoises.
Claim 2
Dependent Claim
100 words
An aqueous clay base drilling fluid composition comprising water, bentonite clay and a polymer effective in increasing the viscosity of a bentonite clay-water suspension selected from the group consisting of a partial calcium salt of sodium polyacrylate, a partial calcium salt of polyacrylic acid and mixtures thereof, said polymer having about 1 to 15% calcium acrylate moieties wherein the polymer is present in an amount greater than about 7% by weight, based on the total weight of bentonite, wherein each polymer, when added to water in an amount of 1% by weight has a viscosity greater than about 10 centipoises.
Claim 3
Dependent Claim
28 words
A composition as defined by claim 1 wherein the polymer is present in an amount greater than about 10% by weight, based on the total weight of bentonite.
Claim 4
Dependent Claim
28 words
A composition as defined by claim 1 wherein the polymer is present in an amount greater than about 20% by weight, based on the total weight of bentonite.
Claim 5
Dependent Claim
111 words
In a method of drilling a well employing a cutting bit and a drilling fluid, the improvement comprising circulating in said well, while driling a fluid having water, bentonite clay and a polymer selected from the group consisting of a partial calcium salt of sodium polyacrylate, a partial calcium salt of polyacrylic acid and mixtures thereof, said polymer having about 1% to 15% calcium acrylate moieties, and wherein the polymer is present in an amount greater than about 7% by weight, based on the total weight of bentonite clay, wherein each polymer, when added to water in an amount of 1% by weight, has a viscosity greater than about 10 centipoises.
Claim 6
Dependent Claim
111 words
In a method of drilling a well employing a cutting bit and a drilling fluid, the improvement comprising circulating in said well, while driling a fluid having water, bentonite clay and a polymer selected from the group consisting of a partial calcium salt of sodium polyacrylate, a partial calcium salt of polyacrylic acid and mixtures thereof, said polymer having about 1% to 15% calcium acrylate moieties, and wherein the polymer is present in an amount greater than about 7% by weight, based on the total weight of bentonite clay, wherein each polymer, when added to water in an amount of 1% by weight, has a viscosity greater than about 10 centipoises.
Claim 7
Dependent Claim
26 words
The combination of claim 4 wherein the polymer is present in an amount greater than about 10% by weight, based on the total weight of bentonite.
Claim 8
Dependent Claim
26 words
The combination of claim 4 wherein the polymer is present in an amount greater than about 20% by weight based on the total weight of bentonite.
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) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |