US3720610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thinner for drilling fluids
Assignee: BK Giulini GmbH
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Filing: 1970-06-09
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Granted: 1973-03-13
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Expires: 1990-06-09
Abstract
Abstract The thinner according to this invention added to drilling fluids used for drilling for petroleum or natural gas is gluconic acid and/or its heavy metal salts and/or its alkali metal-heavy metal salts, especially chromic gluconate and/or an alkali metal chromic gluconate.
Inventors
- 👤 A Erasmus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:57
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/203; C09K8/22; C09K8/24
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
94 words
Thinner for a drilling fluid composed of an aqueous suspension of a swellable, hydratable clay used in drilling for petroleum and natural gas, said thinner being a mixture of a Gluconic acid compound selected from the group consisting of simple heavy metal salts of gluconic acid said heavy metal selected from the group consisting of nickel, cobalt, iron, copper, chromium, manganese, and thallium and the complex salts of said heavy metal gluconates with alkali metals and of at least one other thinner selected from the group consisting of natural tannins, lignosulfonates, and mined lignin.
Claim 2
Dependent Claim
94 words
Thinner for a drilling fluid composed of an aqueous suspension of a swellable, hydratable clay used in drilling for petroleum and natural gas, said thinner being a mixture of a Gluconic acid compound selected from the group consisting of simple heavy metal salts of gluconic acid said heavy metal selected from the group consisting of nickel, cobalt, iron, copper, chromium, manganese, and thallium and the complex salts of said heavy metal gluconates with alkali metals and of at least one other thinner selected from the group consisting of natural tannins, lignosulfonates, and mined lignin.
Claim 3
Dependent Claim
38 words
Thinner according to claim 1, wherein the thinner is a mixture of said simple heavy metal salt of gluconic acid and at least one other thinner selected from the group consisting of natural tannins, lignosulfonates, and mined lignin.
Claim 4
Dependent Claim
76 words
A drilling fluid for drilling for petroleum and natural gas consisting of an aqueous suspension of a hydratable, swellable clay having added thereto between about 0.1 and about 5 percent of a gluconic acid compound selected from the group consisting of simple heavy metal salts of gluconic acid said heavy metal selected from the group consisting of nickel, cobalt, iron, chromium, manganese, and thallium and the complex salts of said heavy metal gluconates with alkali metals.
Claim 5
Dependent Claim
76 words
A drilling fluid for drilling for petroleum and natural gas consisting of an aqueous suspension of a hydratable, swellable clay having added thereto between about 0.1 and about 5 percent of a gluconic acid compound selected from the group consisting of simple heavy metal salts of gluconic acid said heavy metal selected from the group consisting of nickel, cobalt, iron, chromium, manganese, and thallium and the complex salts of said heavy metal gluconates with alkali metals.
Claim 6
Dependent Claim
28 words
The drilling fluid according to claim 3, wherein the gluconic acid compound is added to the drilling fluid in an amount between about 0.2 and about 1.5 percent.
Claim 7
Dependent Claim
38 words
The drilling fluid according to claim 3, wherein a chromium salt of gluconic acid is added to the drilling fluid, said chromium salt being selected from the group consisting of chromic gluconate and a complex alkali metal-chromic gluconate.
Claim 8
Dependent Claim
61 words
The drilling fluid according to claim 3, wherein a complex chromium salt of gluconic acid is added to the drilling fluid, said complex chromium salt being selected from the group consisting of an alkali metal-chromium gluconate, an alkaline earth metal-chromium gluconate, and a heavy metal-chromium gluconate selected from the group consisting of nickel-chromium gluconate, cobalt-chromium gluconate, iron-chromium gluconate, and copper-chromium gluconate.
Claim 9
Dependent Claim
30 words
The drilling fluid according to claim 3, wherein the drilling fluid additionally contains at least one other thinner selected from the group consisting of natural tannins, lignosulfonates, and mined lignin.
Claim 10
Dependent Claim
30 words
The drilling fluid according to claim 5, wherein the drilling fluid additionally contains at least one other thinner selected from the group consisting of natural tannins, lignosulfonates, and mined lignin.
Claim 11
Dependent Claim
90 words
In a method of drilling for petroleum and natural gas, the step which consists in circulating in said well while drilling a drilling fluid composed of an aqueous suspension of a hydratable, swellable clay having added thereto between about 0.1 and about 5 percent of a gluconic acid compound selected from the group consisting of simple heavy metal salts of gluconic acid said heavy metal selected from the group consisting of nickel, cobalt, iron, chromium, manganese, and thallium and the complex salts of said heavy metal gluconates with alkali metals.
Claim 12
Dependent Claim
90 words
In a method of drilling for petroleum and natural gas, the step which consists in circulating in said well while drilling a drilling fluid composed of an aqueous suspension of a hydratable, swellable clay having added thereto between about 0.1 and about 5 percent of a gluconic acid compound selected from the group consisting of simple heavy metal salts of gluconic acid said heavy metal selected from the group consisting of nickel, cobalt, iron, chromium, manganese, and thallium and the complex salts of said heavy metal gluconates with alkali metals.
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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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |