US4717488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spacer fluid
Assignee: CP Kelco US Inc
•
Filing: 1986-04-23
•
Granted: 1988-01-05
•
Expires: 2006-04-23
Abstract
Abstract A spacer fluid for use in oil well drilling applications is disclosed. The fluid is prepared from a slurry comprising 25-60% heteropolysaccharide S-130, 0.5-6% organophilic clay, 30-70% solvent, up to 10% surfactant, and up to 6% methanol or isopropanol.
Inventors
- 👤 James M. Seheult
- 👤 Ernest L. Grebe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:13
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/601; C09K8/42; C09K8/424; Y; Y10; Y10S; Y10S507/00; Y10S507/927; Y10S507/928
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
54 words
A slurry useful in preparing spacer fluids, said slurry consisting essentially of: ______________________________________
% (wt.)
______________________________________
Heteropolysaccharide S-130
25-60
Organophilic clay 0.5-6
Hydrocarbon solvent 30-70
Surfactant 0-10
Lower alkanol 0-6
______________________________________ wherein the surfactant is ethoxylated nonylphenol, the fatty acid esters of vegetable or animal oil, ethoxylated linear alcohol, or ethylene glycol monobutyl ether.
Claim 2
Dependent Claim
54 words
A slurry useful in preparing spacer fluids, said slurry consisting essentially of: ______________________________________
% (wt.)
______________________________________
Heteropolysaccharide S-130
25-60
Organophilic clay 0.5-6
Hydrocarbon solvent 30-70
Surfactant 0-10
Lower alkanol 0-6
______________________________________ wherein the surfactant is ethoxylated nonylphenol, the fatty acid esters of vegetable or animal oil, ethoxylated linear alcohol, or ethylene glycol monobutyl ether.
Claim 3
Dependent Claim
44 words
A slurry of claim 1, wherein the organophilic clay is bentonite, hectorite, amine-treated montmorillonite, or attapulgite clay; the solvent is mineral oil, diesel oil, kerosene, 5-12 carbon chain alcohol, or vegetable oil; and the lower alkanol is a 1-3 carbon branched- or straight-chain alcohol.
Claim 4
Dependent Claim
22 words
A slurry of claim 1, wherein the solvent is mineral oil, the surfactant is ethoxylated nonylphenol, and the lower alkanol is isopropanol.
Claim 5
Dependent Claim
25 words
A slurry of claim 1 consisting essentially of: ______________________________________
% (wt.)
______________________________________
S-130 23.5
organophilic clay
3.5
mineral oil 67.5
surfactant 3
isopropanol 2.5
______________________________________
Claim 6
Dependent Claim
28 words
A spacer fluid comprising water and a slurry of claim 1 said spacer fluid comprising 0.25 to 2.5 pounds S-130 per barrel (0.113-1.13 kg/158.98 l) of spacer fluid.
Claim 7
Dependent Claim
35 words
A process for preparing a spacer fluid which comprises adding and mixing therein a slurry of claim 1 to water such that the spacer fluid contains 0.25 to 2.5 lb/bbl (0.113-1.13 kg/158.98 l) of S-130.
References Cited (Backward Citations)
US4141843A
Cited
US4312675A
Cited
US4350601A
Cited
US4304300A
Cited
US4342866A
Cited
US4352861A
Cited
US4330414A
Cited
US4566977A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-04 | 1991-07-06 | 1992-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-04 | 1995-07-06 | 1996-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-04 | 1999-07-06 | 2000-01-05 | $7700.00 | Window Closed / Lapsed |