US3887009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling mud-cement compositions for well cementing operations
Assignee: Hughes Tool Co
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Filing: 1974-04-25
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Granted: 1975-06-03
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Expires: 1994-04-25
Abstract
Abstract A low clay content aqueous drilling mud or a magnesium saltbased aqueous drilling mud may be transformed into cement for well cementing by addition of magnesium oxide, magnesium sulfate and dolomite or magnesium carbonate to produce a magnesium oxysulfate cement.
Inventors
- 👤 Geo L Miller
- 👤 Horst K F Barthel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:30
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/42; C04; C04B; C04B28/00; C04B28/30; C09K8/02; C09K8/04; C09K8/05
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
124 words
A METHOD FOR CEMENTING A WELL BOREHOLE BEING DRILLED WITH A SALT WATER ON BRINE BASED DRILLING FLUID LESS THAN 5 POUNDS PER BARREL SWELLABLE CLAY, WHICH COMPRISES: A. ADMIXING SAID DRILLING FLUID WITH AN ADDITIVE COMPOSITION COMPRISING ABOUT 9 TO ABOUT 40 PARTS BY WEIGHT MAGNESIUM OXIDE, ABOUT 12 TO ABOUT 50 PARTS BY WEIGHT MAGNESIUM SULFATE AND FROM ABOUT 20 TO ABOUT 60 PARTS BY WEIGHT MAGNESIUM CARBONATE OR DOLOMITE TO PROVIDE A HARDENABLE COMPOSITION OF PUMPABLE VISCOSITY AND CONTAINING FROM ABOUT 20 TO ABOUT 40 PERCENT BY WEIGHT WATER; B. PUMPING SAID HARDENABLE COMPOSITION TO THE DESIRED INTERVAL IN SAID WELL BOREHOLE; AND C. CEASING FLUID CIRCULATION IN SAID BOREHOLE TO PERMIT SAID HARDENABLE COMPOSITION TO HARDEN AT SAID DESIRED INTERVAL.
Claim 2
Independent Claim
124 words
A METHOD FOR CEMENTING A WELL BOREHOLE BEING DRILLED WITH A SALT WATER ON BRINE BASED DRILLING FLUID LESS THAN 5 POUNDS PER BARREL SWELLABLE CLAY, WHICH COMPRISES: A. ADMIXING SAID DRILLING FLUID WITH AN ADDITIVE COMPOSITION COMPRISING ABOUT 9 TO ABOUT 40 PARTS BY WEIGHT MAGNESIUM OXIDE, ABOUT 12 TO ABOUT 50 PARTS BY WEIGHT MAGNESIUM SULFATE AND FROM ABOUT 20 TO ABOUT 60 PARTS BY WEIGHT MAGNESIUM CARBONATE OR DOLOMITE TO PROVIDE A HARDENABLE COMPOSITION OF PUMPABLE VISCOSITY AND CONTAINING FROM ABOUT 20 TO ABOUT 40 PERCENT BY WEIGHT WATER; B. PUMPING SAID HARDENABLE COMPOSITION TO THE DESIRED INTERVAL IN SAID WELL BOREHOLE; AND C. CEASING FLUID CIRCULATION IN SAID BOREHOLE TO PERMIT SAID HARDENABLE COMPOSITION TO HARDEN AT SAID DESIRED INTERVAL.
Claim 3
Independent Claim
124 words
A method for cementing a well borehole being drilled with a salt water or brine based drilling fluid less than 5 pounds per barrel swellable clay, which comprises: a. admixing said drilling fluid with an additive composition comprising about 9 to about 40 parts by weight magnesium oxide, about 12 to about 50 parts by weight magnesium sulfate and from about 20 to about 60 parts by weight magnesium carbonate or dolomite to provide a hardenable composition of pumpable viscosity and containing from about 20 to about 40 percent by weight water; b. pumping said hardenable composition to the desired interval in said well borehole; and c. ceasing fluid circulation in said borehole to permit said hardenable composition to harden at said desired interval.
Claim 4
Independent Claim
124 words
A method for cementing a well borehole being drilled with a salt water or brine based drilling fluid less than 5 pounds per barrel swellable clay, which comprises: a. admixing said drilling fluid with an additive composition comprising about 9 to about 40 parts by weight magnesium oxide, about 12 to about 50 parts by weight magnesium sulfate and from about 20 to about 60 parts by weight magnesium carbonate or dolomite to provide a hardenable composition of pumpable viscosity and containing from about 20 to about 40 percent by weight water; b. pumping said hardenable composition to the desired interval in said well borehole; and c. ceasing fluid circulation in said borehole to permit said hardenable composition to harden at said desired interval.
Claim 5
Dependent Claim
20 words
The method of claim 1, wherein the drilling fluid used in said admixing is a clay-free magnesium-salt based drilling fluid.
References Cited (Backward Citations)
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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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |