US3858657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well stimulation with polyamine solutions
Assignee: Marathon Oil Co
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Filing: 1973-11-26
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Granted: 1975-01-07
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Expires: 1993-11-26
Abstract
Abstract Polyacrylamide and its derivatives are removed from a subterranean formation by flooding the formation with an aqueous polyamine solution. Skin damage can also be removed by this process, resulting in an improved injectivity index. The polyamine solution is preferably lower mono and dialkyl diamines, and more preferably is hydrazine.
Inventors
- 👤 Gerald W Haws
- 👤 Bruce L Knight
- 👤 John S Rhudy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:16
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/52; C09K8/528; C09K8/58; C09K8/588
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
69 words
A PROCESS FOR INCREASING THE INJECTIVITY OF AN INJECTION MEANS IN FLUID COMMUNICATION WITH AN OIL-BEARING SUBTERRANEAN FORMATION CONTAINING HIGH MOLECULAR WEIGHT POLYACRYLAMIDE(S) AND/OR DERIVATIVES(S) THEREOF IN THE IMMEDIATE VICINITY OF THE FORMATION IN FLUID COMMUNICATION WITH THE INJECTION MEANS, THE PROCESS COMPRISING CONTACTING THE FORMATION WITH AN AQUEOUS SOLUTION COMPRISED OF ABOUT 100 TO ABOUT 30,000 PPM OF POLYAMINE AND THEREAFTER CONTINUING NORMAL OPERATION OF THE INJECTION MEANS.
Claim 2
Dependent Claim
69 words
A PROCESS FOR INCREASING THE INJECTIVITY OF AN INJECTION MEANS IN FLUID COMMUNICATION WITH AN OIL-BEARING SUBTERRANEAN FORMATION CONTAINING HIGH MOLECULAR WEIGHT POLYACRYLAMIDE(S) AND/OR DERIVATIVES(S) THEREOF IN THE IMMEDIATE VICINITY OF THE FORMATION IN FLUID COMMUNICATION WITH THE INJECTION MEANS, THE PROCESS COMPRISING CONTACTING THE FORMATION WITH AN AQUEOUS SOLUTION COMPRISED OF ABOUT 100 TO ABOUT 30,000 PPM OF POLYAMINE AND THEREAFTER CONTINUING NORMAL OPERATION OF THE INJECTION MEANS.
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein about one barrel to about 500 barrels per vertical foot of the aqueous polyamine solution are injected into the formation.
Claim 4
Dependent Claim
22 words
The process of claim 2 wherein the concentration of the polyamine in the aqueous solution is about 500 to about 15,000 ppm.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein a drive medium is injected following the aqueous polyamine solution.
Claim 6
Dependent Claim
11 words
The process of claim 4 wherein the drive medium is water.
Claim 7
Dependent Claim
72 words
A process for increasing the injectivity index of an injection means in fluid communication with an oil-bearing subterranean formation containing a high molecular weight polyacrylamide(s) and/or derivatives(s) thereof in the vicinity of the injection means, the process comprising injecting into the formation an aqueous solution comprised of about 100 to about 30, 000 ppm of a polyamine, the polyamine selected from the group consisting of lower mono and dialkyl derivatives of hydrazine.
Claim 8
Dependent Claim
72 words
A process for increasing the injectivity index of an injection means in fluid communication with an oil-bearing subterranean formation containing a high molecular weight polyacrylamide(s) and/or derivatives(s) thereof in the vicinity of the injection means, the process comprising injecting into the formation an aqueous solution comprised of about 100 to about 30, 000 ppm of a polyamine, the polyamine selected from the group consisting of lower mono and dialkyl derivatives of hydrazine.
Claim 9
Dependent Claim
25 words
The process of claim 6 wherein about one barrel to about 500 barrels per vertical foot of the pOlyamine solution are injected into the formation.
Claim 10
Dependent Claim
23 words
The process of claim 6 wherein the concentration of the polyamine in the aqueous solution is about 500 ppm to about 15.000 ppm.
Claim 11
Dependent Claim
16 words
The process of claim 6 wherein a drive medium is injected following the aqueous polaymine solution.
Claim 12
Dependent Claim
11 words
The process of claim 9 wherein the drive medium is water.
Claim 13
Dependent Claim
63 words
A process for increasing the injectivity index of an injection means in fluid communication with an oil-bearing subterranean formation containing a high molecular weight polyacrylamide(s) and/or derivatives(s) thereof in the vicinity of the injection means, the process comprising contacting the formation with an aqueous solution containing about 100 ppm to about 30,000 ppm of hydrazine, and thereafter continuing operation of the injection means.
Claim 14
Dependent Claim
63 words
A process for increasing the injectivity index of an injection means in fluid communication with an oil-bearing subterranean formation containing a high molecular weight polyacrylamide(s) and/or derivatives(s) thereof in the vicinity of the injection means, the process comprising contacting the formation with an aqueous solution containing about 100 ppm to about 30,000 ppm of hydrazine, and thereafter continuing operation of the injection means.
Claim 15
Dependent Claim
27 words
The process of claim 11 wherein about one barrel to about 500 barrels of the hydrazine solution per vertical foot of formation are injected into the formation.
Claim 16
Dependent Claim
19 words
The process of claim 11 wherein the concentration of the hydrazine is about 500 ppm to about 15,000 ppm.
Claim 17
Dependent Claim
14 words
The process of claim 11 wherein water is injected following the aqueous hydrazine solution.
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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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |