Claims
- 1. A method for drilling and cementing a well, comprising
- drilling a borehole with a drilling fluid containing seawater and lignosulfonate,
- depositing a filter cake on the borehole wall,
- converting the drilling fluid to a lime drilling fluid by addition of lime and treating with sodium carbonate or zinc carbonate;
- adding blast furnace slag to the drilling fluid to form a cementitious slurry,
- displacing the slurry into the borehole, and
- allowing the slurry to set and bond to the filter cake.
- 2. A method for drilling and cementing a well, comprising
- drilling a borehole with a drilling fluid containing salt water and partially hydrolyzed polyacrylamide,
- depositing a filter cake on the borehole wall,
- treating the drilling fluid with sodium hydroxide or potassium hydroxide,
- adding blast furnace slag to the drilling fluid to form a cementitious slurry,
- displacing the slurry into the borehole, and
- allowing the slurry to set and bond to the filter cake.
- 3. A method for drilling and cementing a well, comprising
- drilling a borehole with a drilling fluid containing seawater/gypsum,
- depositing a filter cake on the borehole wall,
- converting the drilling fluid to a lime drilling fluid by addition of lime and treating with sodium carbonate or zinc carbonate;
- adding blast furnace slag to the drilling fluid to form a cementitious slurry,
- displacing the slurry into the borehole, and
- allowing the slurry to set and bond to the filter cake.
- 4. A method for drilling and cementing a well, comprising
- drilling a borehole with a drilling fluid containing sodium chloride/partially hydrolyzed polyacrylamide,
- depositing a filter cake on the borehole wall,
- converting the drilling fluid to a lime drilling fluid by addition of lime and treating with sodium carbonate or zinc carbonate;
- adding blast furnace slag to the drilling fluid to form a cementitious slurry,
- displacing the slurry into the borehole, and
- allowing the slurry to set and bond to the filter cake.
Parent Case Info
This is a division of Ser. No. 08/038,040 filed on Mar. 24, 1993, now abandoned, which is a continuation of 07/751/399 filed Aug. 28, 1991, now abandoned, which is a division of Ser. No. 07/671,627 filed Mar. 19, 1991, now U.S. Pat. No. 5,058,679), which is a continuation in part of Ser. No. 07/651/794 filed Jan. 16, 1991, now abandoned, which is a continuation in part of Ser. No. 07/457,429 filed Dec. 27, 1989, now abandoned.
US Referenced Citations (68)
Foreign Referenced Citations (1)
Number |
Date |
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324887A |
Jan 1988 |
EPX |
Divisions (2)
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Number |
Date |
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Parent |
38040 |
Mar 1993 |
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Parent |
671627 |
Mar 1991 |
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Continuations (1)
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Date |
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Parent |
751399 |
Aug 1991 |
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Continuation in Parts (2)
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Number |
Date |
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Parent |
641794 |
Jan 1991 |
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Parent |
457429 |
Dec 1989 |
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