Patent US4257903A successfully refreshed from Google Patents.
US4257903A
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Drilling fluid containing crosslinked polysaccharide derivative
Assignee: Schlumberger Technology Corp
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Filing: 1978-10-19
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Granted: 1981-03-24
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Expires: 1998-10-19
Abstract
Abstract A drilling fluid having extremely desirable physical properties which comprises an aqueous solution of a hydroxyalkyl polysaccharide derivative and a water soluble ionic aluminum crosslinking agent, preferably sodium aluminate.
Inventors
- 👤 Clare H. Kucera
- 👤 Donald N. DeMott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:37
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/206; C08; C08L; C08L5/00; Y; Y10; Y10S; Y10S507/00; Y10S507/903
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
24 words
An improved drilling fluid comprising an aqueous solution of a gelling amount of a hydroxyalkyl galactomannan crosslinked with a water soluble alkali metal aluminate.
Claim 2
Dependent Claim
24 words
An improved drilling fluid comprising an aqueous solution of a gelling amount of a hydroxyalkyl galactomannan crosslinked with a water soluble alkali metal aluminate.
Claim 3
Dependent Claim
53 words
The improved drilling fluid of claim 1 wherein said hydroxyalkyl galactomannan is present in an amount ranging from about 0.05 to about 2.5 pounds per barrel, of unweighted drilling fluid, and wherein said water soluble alkali metal aluminate is present in an amount ranging from about 0.17 to about 11.5 pounds per barrel.
Claim 4
Dependent Claim
49 words
The improved drilling fluid of claim 2 wherein said hydroxyalkyl galactomannan is present in an amount ranging from about 0.5 to about 1.5 pounds per barrel and wherein said water soluble alkali metal aluminate is present in an amount ranging from about 1.5 to about 3.5 pounds per barrel.
Claim 5
Dependent Claim
15 words
The improved drilling fluid of claim 1 wherein said hydroxyalkyl galactomannan is a hydroxypropyl galactomannan.
Claim 6
Dependent Claim
14 words
The improved drilling fluid of claim 4 wherein said hydroxyalkyl galactomannan is hydroxypropyl guar.
Claim 7
Dependent Claim
39 words
The improved drilling fluid of claim 1 wherein said hydroxyalkyl galactomannan has the following generalized molecular structure: ##STR2## wherein R=CH 2 CH(CH 3 )O, and the molecular substitution of said hydroxyalkyl galactomannan ranges from about 0.35 to about 0.50%.
Claim 8
Dependent Claim
23 words
The improved drilling fluid of claim 1, 2, 3, 4, 5 or 6 wherein said water soluble alkali metal aluminate is sodium aluminate.
Claim 9
Dependent Claim
51 words
In a rotary drilling process for drilling a borehole into the earth utilizing a rotating drill bit, wherein a drilling fluid is circulated past the surface of the drill bit and thence to the earth's surface, the improvement which comprises employing as the drilling fluid the composition defined by claim 1.
Claim 10
Dependent Claim
48 words
The process of claim 8 wherein said hydroxyalkyl galactomannan is present in an amount ranging from about 0.05 to about 2.5 pounds per barrel of drilling fluid, and wherein said alkali metal aluminate is present in an amount ranging from about 0.17 to about 11.5 pounds per barrel.
Claim 11
Dependent Claim
45 words
The process of claim 9 wherein said hydroxyalkyl galactomannan is present in an amount ranging from about 0.5 to about 1.5 pounds per barrel, and wherein said alkali metal aluminate is present in an amount ranging from about 1.5 to about 3.5 pounds per barrel.
Claim 12
Dependent Claim
13 words
The process of claim 8 wherein said hydroxyalkyl galactomannan is a hydroxypropyl galactomannan.
Claim 13
Dependent Claim
12 words
The process of claim 11 wherein said hydroxyalkyl galactomannan is hydroxypropyl guar.
Claim 14
Dependent Claim
37 words
The process of claim 8 wherein said hydroxyalkyl galactomannan has the following generalized molecular structure: ##STR3## wherein R=CH 2 CH(CH 3 )O, and the molecular substitution of said hydroxyalkyl galactomannan ranges from about 0.35 to about 0.50%.
Claim 15
Dependent Claim
19 words
The process of claim 8, 9, 10, 11, 12, or 13 wherein said alkali metal aluminate is sodium aluminate.
Claim 16
Dependent Claim
80 words
An improved drilling fluid comprising an aqueous solution of a gelling amount of a hydroxypropyl galactomannan crosslinked with a water soluble ionic aluminum compound wherein said hydroxypropyl galactomannan is present in an amount ranging from about 0.05 to about 2.5 pounds per barrel of unweighted drilling fluid, and wherein said water soluble ionic aluminum compound is an alkali metal aluminate which is present in an amount ranging from about 0.17 to about 11.5 pounds per barrel of unweighted drilling fluid.
Claim 17
Dependent Claim
80 words
An improved drilling fluid comprising an aqueous solution of a gelling amount of a hydroxypropyl galactomannan crosslinked with a water soluble ionic aluminum compound wherein said hydroxypropyl galactomannan is present in an amount ranging from about 0.05 to about 2.5 pounds per barrel of unweighted drilling fluid, and wherein said water soluble ionic aluminum compound is an alkali metal aluminate which is present in an amount ranging from about 0.17 to about 11.5 pounds per barrel of unweighted drilling fluid.
Claim 18
Dependent Claim
55 words
The improved drilling fluid of claim 15 wherein said hydroxypropyl galactomannan is hydroxypropyl guar which is present in an amount ranging from about 0.15 to about 1.5 pounds per barrel, and wherein said ionic aluminum compound is sodium aluminate which is present in an amount ranging from about 1.5 to about 3.5 pounds per barrel.
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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) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |