US4964467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-aqueous viscosified carbon dioxide and method of use
Assignee: Halliburton Co
•
Filing: 1989-10-06
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Granted: 1990-10-23
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Expires: 2009-10-06
Abstract
Abstract A method of treating a subterranean formation is provided using a treating fluid comprising from about 0% up to about 80% by volume liquid carbon dioxide. The remainder of the treating fluid comprises a viscous substantially anhydrous liquid which may be crosslinked by a metal ion source. The treating fluid is formed by the addition of polymers or copolymers of dimethylacrylamide to the substantially anhydrous fluid.
Inventors
- 👤 Marlin D. Holtmyer
- 👤 Charles V. Hunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:02
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; E21B43/267; C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/66; C09K8/68; C09K8/685; E21B43/16; E21B43/164; Y; Y10; Y10S; Y10S507/00; Y10S507/922
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
79 words
A method of treating a subterranean formation penetrated by a well bore comprising: solubilizing a polymer comprising N,N-dimethylacrylamide in a substantially anhydrous fluid to form a viscosified fluid; admixing said viscosified fluid with liquid carbon dioxide to form an admixture in which said carbon dioxide is present in an amount sufficient to comprise from about 0% to about 80% by volume of said admixture; introducing said admixture into said well bore; and treating said subterranean formation with said admixture.
Claim 2
Independent Claim
79 words
A method of treating a subterranean formation penetrated by a well bore comprising: solubilizing a polymer comprising N,N-dimethylacrylamide in a substantially anhydrous fluid to form a viscosified fluid; admixing said viscosified fluid with liquid carbon dioxide to form an admixture in which said carbon dioxide is present in an amount sufficient to comprise from about 0% to about 80% by volume of said admixture; introducing said admixture into said well bore; and treating said subterranean formation with said admixture.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein said substantially anhydrous fluid is selected from the group consisting of monohydric alcohols.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein said polymer is the homopolymer of N,N-dimethylacrylamide.
Claim 5
Dependent Claim
28 words
The method of claim 1 wherein said polymer is present in an amount of about 0.25% to about 2.5% based on the volume of the substantially anhydrous fluid.
Claim 6
Dependent Claim
33 words
The method of claim 1 wherein said substantially anhydrous fluid is admixed with liquid carbon dioxide in a ratio of from about 1 to 1 to a ratio of about 3 to 1.
Claim 7
Dependent Claim
54 words
The method of claim 1 wherein said polymer comprising N,N-dimethylacrylamide is selected from the group consisting of the homopolymer, copolymers with at least one of the following monomers: methacrylamidopropyltrimethyl ammonium chloride, dimethylaminopropyl methacrylamide, 2-acrylamido-2-methyl propane sulfonic acid (sodium salt), trimethylammoniumethyl methacrylic methyl sulfate, trimethylammoniumethyl methacrylic chloride, hydrophobic derivatives of said copolymers, and mixtures thereof.
Claim 8
Dependent Claim
19 words
The method of claim 1 wherein said polymer in said substantially anhydrous fluid is crosslinked with a crosslinking agent.
Claim 9
Independent Claim
126 words
A method of treating a subterranean formation penetrated by a well bore comprising: solubilizing a polymer comprising N,N-dimethylacrylamide in a substantially anhydrous fluid; admixing said substantially anhydrous fluid/polymer solution with a crosslinking agent; admixing said solution with a proppant material and liquid carbon dioxide in a ratio so as to maintain a single-phase, viscosified fluid; introducing said single-phase, viscosified fluid into said well bore and said subterranean formation at a temperature below the critical temperature of carbon dioxide and under sufficient pressure to maintain the carbon dioxide as a liquid; and maintaining said single-phase, viscosified fluid within said formation for a sufficient time to permit said fluid to be heated to a temperature above the critical temperature of carbon dioxide to form a stabilized supercritical fluid.
Claim 10
Independent Claim
126 words
A method of treating a subterranean formation penetrated by a well bore comprising: solubilizing a polymer comprising N,N-dimethylacrylamide in a substantially anhydrous fluid; admixing said substantially anhydrous fluid/polymer solution with a crosslinking agent; admixing said solution with a proppant material and liquid carbon dioxide in a ratio so as to maintain a single-phase, viscosified fluid; introducing said single-phase, viscosified fluid into said well bore and said subterranean formation at a temperature below the critical temperature of carbon dioxide and under sufficient pressure to maintain the carbon dioxide as a liquid; and maintaining said single-phase, viscosified fluid within said formation for a sufficient time to permit said fluid to be heated to a temperature above the critical temperature of carbon dioxide to form a stabilized supercritical fluid.
Claim 11
Dependent Claim
19 words
The method of claim 8 wherein said substantially anhydrous fluid is selected from the group consisting of monohydric alcohols.
Claim 12
Dependent Claim
28 words
The method of claim 8 wherein said polymer is present in an amount of from about 0.25% to about 2.5% based upon the volume of substantially anhydrous fluid.
Claim 13
Dependent Claim
30 words
The method of claim 8 wherein said substantially anhydrous fluid is admixed with liquid carbon dioxide in a ratio of from about 1 to 1 to about 3 to 1.
Claim 14
Dependent Claim
20 words
The method of claim 8 wherein said crosslinking agent is selected from the group consisting of compounds providing zirconium ions.
Claim 15
Dependent Claim
53 words
The method of claim 8 wherein said polymer consisting of N,N-dimethylacrylamide is selected from the group consisting of the homopolymer, copolymers with at least one of the following monomers: methacrylamidopropyltrimethyl ammonium chloride, dimethylaminopropylmethacrylamide, 2-acrylamido-2-methylpropane sulfonic acid (sodium salt), trimethylammoniumethyl methacrylic methyl sulfate, trimethylammoniumethyl methacrylic chloride, hydrophobic derivatives of said copolymers, and mixtures thereof.
Claim 16
Independent Claim
120 words
A method of treating a subterranean formation penetrated by a well bore comprising: solubilizing a polymer comprising N,N-dimethylacrylamide in a substantially anhydrous monohydric alcohol to form a viscosified fluid; admixing said viscosified fluid with liquid carbon dioxide in a ratio so as to form a singlephase, viscosified fluid; introducing said single-phase, viscosified fluid into said well bore and said subterranean formation at a temperature below the critical temperature of liquid carbon dioxide and a sufficient pressure to maintain the carbon dioxide as a liquid; and maintaining said single-phase, viscosified fluid within said formation for a sufficient time to permit said fluid to be heated to a temperature above the critical temperature of carbon dioxide to form a stabilized supercritical fluid.
Claim 17
Independent Claim
120 words
A method of treating a subterranean formation penetrated by a well bore comprising: solubilizing a polymer comprising N,N-dimethylacrylamide in a substantially anhydrous monohydric alcohol to form a viscosified fluid; admixing said viscosified fluid with liquid carbon dioxide in a ratio so as to form a singlephase, viscosified fluid; introducing said single-phase, viscosified fluid into said well bore and said subterranean formation at a temperature below the critical temperature of liquid carbon dioxide and a sufficient pressure to maintain the carbon dioxide as a liquid; and maintaining said single-phase, viscosified fluid within said formation for a sufficient time to permit said fluid to be heated to a temperature above the critical temperature of carbon dioxide to form a stabilized supercritical fluid.
Claim 18
Dependent Claim
53 words
The method of claim 14 wherein said polymer consisting of N,N-dimethylacrylamide is selected from the group consisting of the homopolymer, copolymers with at least one of the following monomers: methacrylamidopropyltrimethyl ammonium chloride, dimethylaminopropylmethacrylamide, 2-acrylamido-2-methylpropane sulfonic acid (sodium salt), trimethylammoniumethyl methyacrylic methyl sulfate, trimethylammoniumethyl methacrylic chloride, hydrophobic derivatives of said copolymers, and mixtures thereof.
Claim 19
Dependent Claim
23 words
The method of claim 14 wherein said substantially anhydrous monohydric alcohol is selected from the group consisting of methanol, ethanol, propanol and butanol.
Claim 20
Dependent Claim
20 words
The method of claim 14 wherein said polymer is present in an amount of from about 0.25% to about 2.5%.
Claim 21
Dependent Claim
36 words
The method of claim 14 wherein said substantially anhydrous monohydric alcohol is admixed with said liquid carbon dioxide in a ratio of from about 1 to 1 to about 3 to 1 based on liquid volume.
Claim 22
Independent Claim
118 words
A method of treating a subterranean formation penetrated by a well bore comprising: solubilizing a polymer comprising N,N-dimethylacrylamide in substantially anhydrous methanol to form a viscosified fluid; admixing said viscosified fluid with liquid carbon dioxide in a ratio so as to form a single phase, viscosified fluid; introducing said single-phase, viscosified fluid into said well bore and said subterranean formation at a temperature below the critical temperature of liquid carbon dioxide and sufficient pressure to maintain the carbon dioxide as a liquid; and maintaining said single-phase, viscosified fluid within said formation for a sufficient time to permit said fluid to be heated to a temperature above the critical temperature of carbon dioxide to form a stabilized supercritical fluid.
Claim 23
Independent Claim
118 words
A method of treating a subterranean formation penetrated by a well bore comprising: solubilizing a polymer comprising N,N-dimethylacrylamide in substantially anhydrous methanol to form a viscosified fluid; admixing said viscosified fluid with liquid carbon dioxide in a ratio so as to form a single phase, viscosified fluid; introducing said single-phase, viscosified fluid into said well bore and said subterranean formation at a temperature below the critical temperature of liquid carbon dioxide and sufficient pressure to maintain the carbon dioxide as a liquid; and maintaining said single-phase, viscosified fluid within said formation for a sufficient time to permit said fluid to be heated to a temperature above the critical temperature of carbon dioxide to form a stabilized supercritical fluid.
Claim 24
Dependent Claim
53 words
The method of claim 19 wherein said polymer consisting of N,N-dimethylacrylamide is selected from the group consisting of the homopolymer, copolymers with at least one of the following monomers: methacrylamidopropyltrimethyl ammonium chloride, dimethylaminopropylmethacrylamide, 2-acrylamido-2methylpropane sulfonic acid (sodium salt), trimethylammoniumethyl methyacrylic methyl sulfate, trimethylammoniumethyl methacrylic chloride, hydrophobic derivatives of said copolymers, and mixtures thereof.
Claim 25
Independent Claim
127 words
A method of treating a subterranean formation penetrated by a well bore comprising: solubilizing a polymer comprising N,N-dimethylacrylamide in substantially anhydrous methanol to form a viscosified fluid; admixing said viscosified fluid with a crosslinking agent; admixing said viscosified fluid and liquid carbon dioxide in a ratio so as to maintain a single-phase, viscosified admixing said single-phase, viscosified fluid with a proppant material; introducing said single-phase, viscosified fluid into said well bore and said formation at a temperature below the critical temperature of carbon dioxide and a pressure to maintain the carbon dioxide as a liquid; and maintaining said single-phase, viscosified fluid within said formation to permit said fluid to be heated to a temperature above the critical temperature of carbon dioxide to form a stabilized supercritical fluid.
Claim 26
Independent Claim
127 words
A method of treating a subterranean formation penetrated by a well bore comprising: solubilizing a polymer comprising N,N-dimethylacrylamide in substantially anhydrous methanol to form a viscosified fluid; admixing said viscosified fluid with a crosslinking agent; admixing said viscosified fluid and liquid carbon dioxide in a ratio so as to maintain a single-phase, viscosified admixing said single-phase, viscosified fluid with a proppant material; introducing said single-phase, viscosified fluid into said well bore and said formation at a temperature below the critical temperature of carbon dioxide and a pressure to maintain the carbon dioxide as a liquid; and maintaining said single-phase, viscosified fluid within said formation to permit said fluid to be heated to a temperature above the critical temperature of carbon dioxide to form a stabilized supercritical fluid.
Claim 27
Dependent Claim
53 words
The method of claim 21 wherein said polymer consisting of N,N-dimethylacrylamide is selected from the group consisting of the homopolymer, copolymers with at least one of the following monomers: methacrylamidopropyltrimethyl ammonium chloride, dimethylaminopropylmethacrylamide, 2-acrylamido-2-methylpropane sulfonic acid (sodium salt), trimethylammoniumethyl methyacrylic methyl sulfate, trimethylammoniumethyl methacrylic chloride, hydrophobic derivatives of said copolymers, and mixtures thereof.
Claim 28
Dependent Claim
23 words
The method of claim 21 wherein said crosslinking agent is selected from the group consisting of zirconium oxychloride, zirconium lactate, and zirconium acetate.
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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) | 1993-10-22 | 1994-04-23 | 1994-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-22 | 1998-04-23 | 1998-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-22 | 2002-04-23 | 2002-10-23 | $7700.00 | Window Closed / Lapsed |