US3849317A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Additive for reducing gel strength in aqueous lime containing drilling fluids
Assignee: Texaco Inc
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Filing: 1972-12-18
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Granted: 1974-11-19
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Expires: 1992-12-18
Abstract
Abstract The gel strengths and yield points of aqueous drilling fluids which are saturated with calcium hydroxide or lime may be reduced by adding to the drilling fluids an effective amount of a hydrolyzed cereal solid, which is predominantly a hexa-saccharide and higher poly-saccharides.
Inventors
- 👤 T Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:42
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/206
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
58 words
AN AQUEOUS DRILLING FLUID HAVING A LIQUID PHASE SATURATED WITH CALCIUM HYDROXIDE, CONTAINING AS THE ADDITIVE FOR REDUCING GEL STRENGTH AND YIELD POINT, HYDROXYLZED CEREAL SOLIDS WHICH IS COMPRISED OF FROM ABOUT 15 PERCENT TO ABOUT 25 PERCENT BY WEIGHT DI-SACCHARIDES, TRI-SACCHARIDES, TETRA-SACCHARIDES, AND PENTA-SACCHARIDES, AND FROM ABOUT 75 TO ABOUT 85 PERCENT BY WEIGHT HEXA-SACCHARIDES AND ABOVE.
Claim 2
Dependent Claim
58 words
AN AQUEOUS DRILLING FLUID HAVING A LIQUID PHASE SATURATED WITH CALCIUM HYDROXIDE, CONTAINING AS THE ADDITIVE FOR REDUCING GEL STRENGTH AND YIELD POINT, HYDROXYLZED CEREAL SOLIDS WHICH IS COMPRISED OF FROM ABOUT 15 PERCENT TO ABOUT 25 PERCENT BY WEIGHT DI-SACCHARIDES, TRI-SACCHARIDES, TETRA-SACCHARIDES, AND PENTA-SACCHARIDES, AND FROM ABOUT 75 TO ABOUT 85 PERCENT BY WEIGHT HEXA-SACCHARIDES AND ABOVE.
Claim 3
Dependent Claim
28 words
The drilling fluid as recited in claim 1 wherein from about 1/8 to about 8 pounds of the hydrolyzed cereal solid is added per barrel of drilling fluid.
Claim 4
Dependent Claim
28 words
The drilling fluid as recited in claim 1 wherein from about 1/2 to about 3 pounds of the hydrolyzed cereal solid is added per barrel of drilling fluid.
Claim 5
Dependent Claim
17 words
The drilling fluid as recited in claim 1 wherein the drilling fluid also contains undissolved calcium hydroxide.
Claim 6
Dependent Claim
16 words
The drilling fluid as recited in claim 1 wherein the drilling fluid also contains sodium chloride.
Claim 7
Dependent Claim
82 words
In a method of drilling wells in the earth wherein a drilling fluid is passed through the well in contact with earth formations during the drilling operations, the improvement which comprises contacting said earth formations with an aqueous drilling fluid whose filtrate phase is saturated with respect to calcium hydroxide and which further contains at least 1/8 pound per barrel of drilling fluid of a hydrolyzed cereal solid, said hydrolyzed cereal solid being comprised of at least 75 percent hexa-saccharide and abovE.
Claim 8
Dependent Claim
82 words
In a method of drilling wells in the earth wherein a drilling fluid is passed through the well in contact with earth formations during the drilling operations, the improvement which comprises contacting said earth formations with an aqueous drilling fluid whose filtrate phase is saturated with respect to calcium hydroxide and which further contains at least 1/8 pound per barrel of drilling fluid of a hydrolyzed cereal solid, said hydrolyzed cereal solid being comprised of at least 75 percent hexa-saccharide and abovE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |