US4629575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drilling and production fluids employing parenchymal cell cellulose
Assignee: SBP Inc A CORP OF
•
Filing: 1983-07-06
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Granted: 1986-12-16
•
Expires: 2003-07-06
Abstract
Abstract Circulating and non-circulating well-drilling fluids are provided comprising parenchymal cell cellulose. In accordance with a preferred embodiment, improved viscosity and fluid loss control in circulating well-drilling fluids are obtained from the inclusion of parenchymal cell cellulose in such fluids. In accordance with another preferred embodiment, certain polymers, especially anionic polymers, and polymers derived from hemicellulosic materials are admixed with parenchymal cell cellulsoe in well fluids to provide synergistic fluid loss control and other beneficial properties. Methods for the employment of circulating and non-circulating well fluids employing parenchymal cell cellulose are also disclosed.
Inventors
- 👤 Michael K. Weibel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:09
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/84; C09K8/86; C09K8/88; C09K8/90; C08; C08B; C08B37/00; C08B37/0006; C08B37/0057; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/206; C09K8/62; C09K8/70; C09K8/703; D; D21; D21C; D21C5/00; E; E21; E21B; E21B21/00; E21B21/003; Y; Y10; Y10S; Y10S507/00; Y10S507/922; Y10S507/925; Y10S507/933
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
19 words
A method of drilling a well comprising circulating through the well being drilled a fluid comprising parenchymal cell cellulose.
Claim 2
Independent Claim
19 words
A method of drilling a well comprising circulating through the well being drilled a fluid comprising parenchymal cell cellulose.
Claim 3
Dependent Claim
29 words
The method of claim 1 wherein said fluid further comprises a polymer soluble in the fluid in an amount sufficient to improve the fluid loss control of said fluid.
Claim 4
Dependent Claim
26 words
The method of claim 2 wherein said polymer is selected from the group consisting of carboxyalkyl cellulose, anionic polymers, nonionic polymers and polymers derived from starch.
Claim 5
Dependent Claim
23 words
The method of claim 1 wherein said fluid further comprises hemicellulose in an amount sufficient to improve fluid loss control of said fluid.
Claim 6
Dependent Claim
17 words
The method of claim 4 wherein said hemicellulose is derived from alkaline saponification of a cellulosic material.
Claim 7
Dependent Claim
24 words
The method of claim 1 wherein said fluid further comprises clay in an amount sufficient to improve the fluid loss control of said fluid.
Claim 8
Dependent Claim
24 words
The method of claim 2 wherein said fluid further comprises clay in an amount sufficient to improve the fluid loss control of said fluid.
Claim 9
Dependent Claim
27 words
The method of claim 1 wherein said fluid further comprises one or more materials selected from the group consisting of weighting agent, clay, brine and fibrous cellulose.
Claim 10
Dependent Claim
8 words
A non-circulating well fluid comprising parenchymal cell cellulose.
Claim 11
Dependent Claim
8 words
A non-circulating well fluid comprising parenchymal cell cellulose.
Claim 12
Dependent Claim
36 words
The fluid of claim 9 further comprising one or more materials selected from the group consisting of anionic polymer, substantially nonionic polymer, polymer derived from starch, carboxyalkyl cellulose, weighting agent, clay, brine, fibrous cellulose and acid.
Claim 13
Dependent Claim
11 words
The fluid of claim 9 adapted for fracturing a subterranean formation.
Claim 14
Dependent Claim
14 words
The fluid of claim 9 adapted for use as a completion or workover fluid.
Claim 15
Dependent Claim
13 words
The fluid of claim 9 adapted for use as an acid stimulation fluid.
Claim 16
Dependent Claim
19 words
A process of improving or maintaining a well comprising placing into said well a fluid comprising parenchymal cell cellulose.
Claim 17
Dependent Claim
19 words
A process of improving or maintaining a well comprising placing into said well a fluid comprising parenchymal cell cellulose.
Claim 18
Dependent Claim
39 words
The method of claim 14 wherein said fluid further comprises one or more materials selected from the group consisting of anionic polymer, substantially nonionic polymer, polymer derived from starch, carboxyalkyl cellulose, weighting agent, clay, brine, fibrous cellulose and acid.
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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) | 1989-12-15 | 1990-06-16 | 1990-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-15 | 1994-06-16 | 1994-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-15 | 1998-06-16 | 1998-12-16 | $7700.00 | Window Closed / Lapsed |