EP0063471A1
Expired / Lapsed
EP
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Composition and method for releasing stuck drill pipes
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1982-04-15
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Granted: —
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Expires: 2002-04-15
Abstract
Abstract An additive composition effective in the release of stuck pipe in a borehole during a drilling operation which composition contains propoxylated C 18 -C 32 alkanols of the formula: (wherein R is an alkyl group containing from 18 to 32 carbon atoms and n is an integer of from 18 to 35), an oil-soluble emulsifier-wetting agent and a liquid hydro-carbon diluent.
Inventors
- 👤 Thad Oscar Walker
- 👤 Patricia Catherine Matthews
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 02:01
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C08; C08G; C08G65/00; C08G65/02; C08G65/26; C08G65/2603; C08G65/2606; C08G65/2609; E; E21; E21B; E21B31/00; E21B31/035; C09K2208/00; C09K2208/02; Y; Y10; Y10S; Y10S507/00; Y10S507/94
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
33 words
Propoxylated C 18 -C 32 alcohols represented by the formula: wherein R represents an alkyl group of from 18 to 32 carbon atoms and n is an integer of from 18 to 35.
Claim 2
Dependent Claim
33 words
Propoxylated C 18 -C 32 alcohols represented by the formula: wherein R represents an alkyl group of from 18 to 32 carbon atoms and n is an integer of from 18 to 35.
Claim 3
Dependent Claim
24 words
Propoxylated alcohols according to claim 1 wherein R represents predominantly 20 to 24 carbon atom alkyl groups and n ranges from 20 to 25.
Claim 4
Dependent Claim
115 words
An improved method of releasing a stuck drill string in the borehole of an underground formation during drilling operations employing a 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 comprised of propoxylated C 18 -C 32 alcohols represented by the formula: wherein R represents an alkyl group of from 18 to 32 carbon atoms and n is an integer of from 18 to 35; a C 8 -C 22 fatty acid ester of a polyol or polyol anhydride; and a liquid hydrocarbon diluent.
Claim 5
Dependent Claim
115 words
An improved method of releasing a stuck drill string in the borehole of an underground formation during drilling operations employing a 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 comprised of propoxylated C 18 -C 32 alcohols represented by the formula: wherein R represents an alkyl group of from 18 to 32 carbon atoms and n is an integer of from 18 to 35; a C 8 -C 22 fatty acid ester of a polyol or polyol anhydride; and a liquid hydrocarbon diluent.
Claim 6
Dependent Claim
30 words
The method according to claim 3 wherein R contains predominantly 20 to 24 carbon atoms and n ranges from 20 to 25 and said fatty acid ester is sorbitan monooleate.
Claim 7
Dependent Claim
29 words
The method according to claim 4 wherein said hydrocarbon diluent is a member of the class consisting of mineral seal oil, diesel oil, paraffinic oil and white mineral oil.
Claim 8
Dependent Claim
28 words
The method according to claim 3 wherein said composition is a water-in-oil emulsion with said water being from about 10 to 50 percent by weight of said emulsion.
Claim 9
Dependent Claim
33 words
A stuck pipe additive composition which comprises propoxylated C 18 -C 32 alkanols comprising about 18 to 35 pro p oxy groups per alkanol molecule; an oil-soluble emulsifier-wetting agent; and a hydrocarbon diluent.
Claim 10
Dependent Claim
33 words
A stuck pipe additive composition which comprises propoxylated C 18 -C 32 alkanols comprising about 18 to 35 pro p oxy groups per alkanol molecule; an oil-soluble emulsifier-wetting agent; and a hydrocarbon diluent.
Claim 11
Dependent Claim
51 words
A stuck pipe additive composition according to claim 7 comprising: propoxylated C 18 -C 32 alcohols represented by the formula: wherein R represents an alkyl group of from 18 to 32 carbon atoms and n is an integer of from 18 to 35; an oil-soluble emulsifier-wetting agent; and a hydrocarbon diluent.
Claim 12
Dependent Claim
53 words
A stuck pipe additive composition according to claim 8 wherein said propoxylated alcohols are present in an amount ranging from 10 to 25 weight percent and said emulsifier-wetting agent is present in an amount ranging from 8 to 20 weight percent, said weight percent being based on the total weight of said composition.
Claim 13
Dependent Claim
57 words
A stuck pipe additive concentrate comprising: from 40 to 70 weight percent propoxylated C 18 -C 32 alcohols represented by the formula: wherein R represents an alkyl group of from 18 to 32 carbon atoms and n is an integer of from 18 to 35 and from 60 to 30 weight percent of an oil-soluble emulsifier-wetting agent.
Claim 14
Dependent Claim
57 words
A stuck pipe additive concentrate comprising: from 40 to 70 weight percent propoxylated C 18 -C 32 alcohols represented by the formula: wherein R represents an alkyl group of from 18 to 32 carbon atoms and n is an integer of from 18 to 35 and from 60 to 30 weight percent of an oil-soluble emulsifier-wetting agent.
Claim 15
Dependent Claim
25 words
A stuck pipe additive concentrate according to claim 10 wherein R predominantly contains 20 to 24 carbon atoms and said emulsifier-wetting agent is sorbitan monooleate.
Claim 16
Dependent Claim
27 words
A stuck pipe additive concentrate according to claim 11 wherein said propoxylated alcohols are present in about 57 weight percent and the balance is said sorbitan monooleate.
References Cited (Backward Citations)
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