US4012328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid soluble packer and workover fluid
Assignee: MI Drilling Fluids Co
•
Filing: 1975-03-03
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Granted: 1977-03-15
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Expires: 1995-03-03
Abstract
Abstract A well completion and packer fluid additive consisting essentially of carboxymethyl cellulose crosslinked with an inorganic chromium compound. The fluids prepared with this procedure have temperature stability to 250° F., excellent resistance to contamination, stability in electrolyte solutions such as KCl and CaCl 2 and upon acidizing the fluid retains less the 3% residue.
Inventors
- 👤 Melvel P. Hunter
- 👤 Karl E. Gillenwater
- 👤 Henry J. Warren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:02
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/03; C09K8/035; E; E21; E21B; E21B43/00; E21B43/11; E21B43/119; E21B43/1195; Y; Y10; Y10S; Y10S507/00; Y10S507/903; Y10S507/925; Y10S507/926
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
64 words
A method for preparing an acid soluble well completion packer fluid comprising forming an aqueous homogeneous solution of carboxymethyl cellulose, adding a weighting material to provide desired density, crosslinking the carboxymethyl cellulose by adding chromium compound selected from the group consisting of chromic chloride and chromic acetate and mixing therewith a chemically basic material at such a rate to avoid precipitating the chromium compound.
Claim 2
Independent Claim
64 words
A method for preparing an acid soluble well completion packer fluid comprising forming an aqueous homogeneous solution of carboxymethyl cellulose, adding a weighting material to provide desired density, crosslinking the carboxymethyl cellulose by adding chromium compound selected from the group consisting of chromic chloride and chromic acetate and mixing therewith a chemically basic material at such a rate to avoid precipitating the chromium compound.
Claim 3
Dependent Claim
26 words
The method of claim 1 in which said cellulose is sodium carboxymethyl cellulose and is present in a concentration between about 0.001% and 3%, by weight.
Claim 4
Dependent Claim
20 words
The method of claim 1 in which said chromium compound is present in a concentration between about 0.001% and 0.3%.
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) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |