Patent US4230587A successfully refreshed from Google Patents.
US4230587A
Expired / Lapsed
US
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Additive composition for release of stuck drill pipe
Assignee: Texaco Inc
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Filing: 1978-12-26
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Granted: 1980-10-28
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Expires: 1998-12-26
Abstract
Abstract An additive composition effective in the release of stuck pipe in a bore hole during a drilling operation.
Inventors
- 👤 Clarence O. Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:50
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; E; E21; E21B; E21B31/00; E21B31/03; E21B31/035; C09K2208/00; C09K2208/02; Y; Y10; Y10S; Y10S507/00; Y10S507/94
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
173 words
An improved method of releasing a stuck drill string in the borehole of an underground formation during drilling operations employing an aqueous drilling fluid which comprises contacting said stuck drill string with an additive composition effective to reduce the annular pressure exerted by the drilling fluid against the stuck drill string and to release said stuck drill string, said additive composition being a member selected from the group consisting of 100% by weight polyethylene glycol having a molecular weight of from about 106 to 600; an admixture of from 25 to 50% by weight of a polyethylene glycol having a molecular weight of from 150 to 600 with from 75 to 50% by weight of saturated salt water; an admixture of 50% by weight of a polyethylene glycol having a molecular weight of from 300 to 600 with 50% by weight of sea water; and an admixture of 25% to 50% by weight of a polyethylene glycol having a molecular weight of 300 with from 75 to 50% by weight of sea water.
Claim 2
Dependent Claim
173 words
An improved method of releasing a stuck drill string in the borehole of an underground formation during drilling operations employing an aqueous drilling fluid which comprises contacting said stuck drill string with an additive composition effective to reduce the annular pressure exerted by the drilling fluid against the stuck drill string and to release said stuck drill string, said additive composition being a member selected from the group consisting of 100% by weight polyethylene glycol having a molecular weight of from about 106 to 600; an admixture of from 25 to 50% by weight of a polyethylene glycol having a molecular weight of from 150 to 600 with from 75 to 50% by weight of saturated salt water; an admixture of 50% by weight of a polyethylene glycol having a molecular weight of from 300 to 600 with 50% by weight of sea water; and an admixture of 25% to 50% by weight of a polyethylene glycol having a molecular weight of 300 with from 75 to 50% by weight of sea water.
Claim 3
Dependent Claim
17 words
A method as claimed in claim 1 wherein said 100% by weight polyethylene glycol is diethylene glycol.
Claim 4
Dependent Claim
17 words
A method as claimed in claim 1 wherein said 100% by weight polyethylene glycol is triethylene glycol.
Claim 5
Dependent Claim
18 words
A method as claimed in claim 1 wherein said 100% by weight polyethylene glycol is polyethylene glycol 300.
Claim 6
Dependent Claim
18 words
A method as claimed in claim 1 wherein said 100% by weight polyethylene glycol is polyethylene glycol 600.
Claim 7
Dependent Claim
25 words
A method as claimed in claim 1 wherein said additive composition is sea water solution containing about 25%-50% by weight of said polyethylene glycol 300.
Claim 8
Dependent Claim
25 words
A method as claimed in claim 1 wherein said additive composition is sea water solution containing about 50% by weight of said polyethylene glycol 600.
Claim 9
Dependent Claim
26 words
A method as claimed in claim 1 wherein said additive composition is saturated salt water solution containing from 25% to 50% by weight of triethylene glycol.
Claim 10
Dependent Claim
27 words
A method as claimed in claim 1 wherein said additive composition is saturated salt water solution containing from 25% to 50% by weight of polyethylene glycol 300.
Claim 11
Dependent Claim
27 words
A method as claimed in claim 1 wherein said additive composition is saturated salt water solution containing from 25% to 50% by weight of polyethylene glycol 600.
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) | 1983-10-28 | 1984-04-28 | 1984-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-28 | 1988-04-28 | 1988-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-28 | 1992-04-28 | 1992-10-28 | $7700.00 | Window Closed / Lapsed |