EP0195531A2
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EP
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Organic titanium compositions useful as cross-linkers
Assignee: EIDP Inc
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Filing: 1986-02-21
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Granted: —
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Expires: 2006-02-21
Abstract
Abstract Novel aqueous titanium compositions comprising mixtures of at least two titanium compounds, at least one of which effects cross-linking of hydroxyl-containing materials more rapidly than at least one other titanium compound; the use of such organic titanium compositions in a novel process for hydraulically fracturing oil- and/or gas-containing subterranean formations; and aqueous compositions useful in such a process.
Inventors
- 👤 Donald Edward Putzig
- 👤 Kenneth Cleon Smeltz
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 17:53
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0091; C07; C07F; C07F7/00; C07F7/003; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/66; C09K8/68; C09K8/685
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
100 words
A composition comprising an aqueous solution containing at least two titanium compounds, at least one of which effects cross-linking of hydroxyl-containing materials more rapidly than the other titanium compound, each of which titanium compounds is the reaction product of a polyol, water and an α-hydroxycarboxylic acid plus a tetravalent titanium compound of an inorganic acid, the relative amounts of the titanium compounds being such that the cross-linking rate of the solution is intermediate those of the titanium compound in the solution that has the most rapid cross-linking rate and the titanium compound in the solution having the slowest cross-linking rate.
Claim 2
Dependent Claim
100 words
A composition comprising an aqueous solution containing at least two titanium compounds, at least one of which effects cross-linking of hydroxyl-containing materials more rapidly than the other titanium compound, each of which titanium compounds is the reaction product of a polyol, water and an α-hydroxycarboxylic acid plus a tetravalent titanium compound of an inorganic acid, the relative amounts of the titanium compounds being such that the cross-linking rate of the solution is intermediate those of the titanium compound in the solution that has the most rapid cross-linking rate and the titanium compound in the solution having the slowest cross-linking rate.
Claim 3
Dependent Claim
46 words
A composition according to Claim 1, wherein each of said titanium compounds has an α-hydroxycarboxylic acid: titanium mol ratio between about 1:1 and about 3:1, a polyol:titanium mol ratio between about 0.25:1 and about 2:1, and a water:titanium mol ratio between about 36:1 and about 60.:1..
Claim 4
Dependent Claim
41 words
A composition according to Claim 1 or 2, wherein the volume:volume.ratio of the titanium compound that has the most rapid cross-linking rate to the titanium compound having the slowest cross-linking rate is in the range between about 10:1 to about 1:10.
Claim 5
Dependent Claim
16 words
A composition according to Claim 3, wherein said volume:volume ratio is between about 3:1 and 1:3.
Claim 6
Dependent Claim
23 words
A composition according to any preceding claim, wherein said α-hydroxycarboxylic acid is lactic acid, glycolic acid, malic acid, citric acid, or tartaric acid.
Claim 7
Dependent Claim
20 words
A compositon according to any preceding claim, wherein said polyol is glycerol, erythritol, arabitol, xylitol, sorbitol, dulcitol, mannitol, or myo-inositol.
Claim 8
Dependent Claim
11 words
A composition according to Claim 6, wherein said polyol is sorbitol.
Claim 9
Dependent Claim
15 words
A composition according to any preceding claim, wherein said titanium salt is TiCl 4 .
Claim 10
Dependent Claim
16 words
A composition according to any preceding claim, wherein one of said α-hydroxycarboxylic acids is lactic acid.
Claim 11
Dependent Claim
25 words
A composition according to Claim 9, wherein one of the titanium compounds comprises lactic acid, sorbitol, and TiCl 4 in a mol ratio of 1:0.5:1.
Claim 12
Dependent Claim
16 words
A composition according to any preceding claim, wherein one of said α-hydroxycarboxylic acids is malic acid.
Claim 13
Dependent Claim
25 words
A composition according to Claim 11, wherein one of the titanium compounds comprises malic acid, sorbitol, and TiCl 4 in a mol ratio of 1:1:1.
Claim 14
Dependent Claim
49 words
A hydraulic fracturing process " wherein a cross-linked gel is introduced into a subterranean oil- or gas-containing formation at a flow rate and pressure sufficient to create or extend one or more fractures therein, characterised by effecting cross-linking of the gel with a composition according to any preceding claim.
Claim 15
Dependent Claim
33 words
A process according to Claim 13, characterised in that as conditions favoring hydraulic fracturing change during the course of the process, the relative amounts of said titanium compounds are modified to compensate therefor.
Claim 16
Dependent Claim
50 words
A hydraulic fracturing fluid useful in creating or extending one or more fractures in a subterranean oil- or gas-containing formation, the fluid containing water, a cross-linking polymer, a proppant and a cross-linking agent, characterised in that the cross-linking agent is the composition according to any of Claims 1 to 12.
References Cited (Backward Citations)
No citation records indexed.
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