US4123366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling mud containing sodium carboxymethylcellulose and sodium carboxymethyl starch
Assignee: Drilling Specialties Co
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Filing: 1977-08-03
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Granted: 1978-10-31
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Expires: 1997-08-03
Abstract
Abstract Sodium carboxymethylcellulose and sodium carboxymethyl starch incorporated together in drilling mud, especially sea water mud, yield better flow properties with low fluid loss in drilling mud. The control of flow properties and thixotropy at low water loss values in salty drilling muds are better when the mixture is used than for either of the materials used separately.
Inventors
- 👤 Charles A. Sauber
- 👤 Louis E. Roper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:49
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/206
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
44 words
A clay-based drilling mud composed with seawater containing as additive therein to provide a low fluid loss and improved flow properties sodium carboxymethyl starch and sodium carboxymethylcellulose wherein said additives are respectively present in a weight ratio of from about 3:2 to about 19:1.
Claim 2
Dependent Claim
44 words
A clay-based drilling mud composed with seawater containing as additive therein to provide a low fluid loss and improved flow properties sodium carboxymethyl starch and sodium carboxymethylcellulose wherein said additives are respectively present in a weight ratio of from about 3:2 to about 19:1.
Claim 3
Dependent Claim
55 words
A process of drilling a well employing a clay-based drilling mud composed with seawater which comprises adding to the drilling mud to provide low fluid loss and improved flow properties sodium carboxymethyl starch and sodium carboxymethylcellulose, respectively, in the range of from about 3:2 to about 19:1 and circulating said drilling mud in said well.
Claim 4
Dependent Claim
55 words
A process of drilling a well employing a clay-based drilling mud composed with seawater which comprises adding to the drilling mud to provide low fluid loss and improved flow properties sodium carboxymethyl starch and sodium carboxymethylcellulose, respectively, in the range of from about 3:2 to about 19:1 and circulating said drilling mud in said well.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-30 | 1982-05-01 | 1982-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-30 | 1986-05-01 | 1986-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-30 | 1990-05-01 | 1990-10-31 | $7700.00 | Window Closed / Lapsed |