CA2037974A1 - Method and composition for delaying the gellation of borated gallactomannans - Google Patents
Method and composition for delaying the gellation of borated gallactomannansInfo
- Publication number
- CA2037974A1 CA2037974A1 CA 2037974 CA2037974A CA2037974A1 CA 2037974 A1 CA2037974 A1 CA 2037974A1 CA 2037974 CA2037974 CA 2037974 CA 2037974 A CA2037974 A CA 2037974A CA 2037974 A1 CA2037974 A1 CA 2037974A1
- Authority
- CA
- Canada
- Prior art keywords
- cross
- linking
- additive
- borate ions
- complexor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Colloid Chemistry (AREA)
- Lubricants (AREA)
Abstract
A complexor and method of use are shown for providing controlled delay of the cross-linking reaction in an aqueous well fracturing fluid. A base fluid is first prepared by blending together an aqueous fluid and a hydratable polymer which is capable of gelling in the presence of borate ions.
The complexor is prepared by mixing a cross-linking additive capable of furnishing borate ions in solution with a delay additive. The delay additive is effective, within a selected pH range, to chemically bond with both boric acid and the borate ions produced by the cross-linking additive to thereby limit the number of borate ions initially available in solution for subsequent cross-linking of the hydratable polysaccharide. The subsequent rate of cross-linking of the polysaccharide can be controlled by adjusting the pH of the complexor solution.
The complexor is prepared by mixing a cross-linking additive capable of furnishing borate ions in solution with a delay additive. The delay additive is effective, within a selected pH range, to chemically bond with both boric acid and the borate ions produced by the cross-linking additive to thereby limit the number of borate ions initially available in solution for subsequent cross-linking of the hydratable polysaccharide. The subsequent rate of cross-linking of the polysaccharide can be controlled by adjusting the pH of the complexor solution.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA 2037974 CA2037974C (en) | 1990-01-16 | 1991-03-11 | Method and composition for delaying the gellation of borated gallactomannans |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/465,903 US5082579A (en) | 1990-01-16 | 1990-01-16 | Method and composition for delaying the gellation of borated galactomannans |
CA 2037974 CA2037974C (en) | 1990-01-16 | 1991-03-11 | Method and composition for delaying the gellation of borated gallactomannans |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2037974A1 true CA2037974A1 (en) | 1992-09-12 |
CA2037974C CA2037974C (en) | 2001-07-03 |
Family
ID=25674507
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA 2037974 Expired - Lifetime CA2037974C (en) | 1990-01-16 | 1991-03-11 | Method and composition for delaying the gellation of borated gallactomannans |
Country Status (1)
Country | Link |
---|---|
CA (1) | CA2037974C (en) |
-
1991
- 1991-03-11 CA CA 2037974 patent/CA2037974C/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
CA2037974C (en) | 2001-07-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed | ||
MKEC | Expiry (correction) |
Effective date: 20121202 |