US3868328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction reducing compounds for use in hydraulic fracturing fluids
Assignee: Calgon Corp
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Filing: 1973-01-15
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Granted: 1975-02-25
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Expires: 1993-01-15
Abstract
Abstract Polymers containing (3-acrylamido-3-methyl) butyl trimethyl ammonium chloride and/or certain related compounds are useful as friction reducers for aqueous fluids flowing through a conduit, especially for the aqueous hydraulic fracturing of subterranean formations, with or without the use of acid.
Inventors
- 👤 Jerry Emile Boothe
- 👤 Fred David Martin
- 👤 Jr Andrew Jackson Sharpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:21
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/72; C09K8/74; C09K8/66; C09K8/68; C09K2208/00; C09K2208/28; Y; Y10; Y10S; Y10S507/00; Y10S507/922; Y10S526/00; Y10S526/923; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
82 words
AN IMPROVED METHOD FOR HYDRAULICALLY FRACTURING AN EARTH FORMATION PENETRATED BY A WELL COMPRISING INJECTING AN AQUEOUS FRACTURING FLUID DOWN THE WELL INTO THE EARTH FORMATION UNDER PRESSURE TO CAUSE FRACTURING OF THE EARTH FORMATION WHEREIN THE IMPROVEMENT COMPRISES TREATING THE AQEUOUS FRACTURING FLUID PRIOR TO INJECTION WITH AN EFFECTIVE AMOUNT OF A RANDOM, LINEAR, WATER-SOLUBLE POLYMER CONSISTING ESSENTIALLY OF FROM ABOUT 1.0 TO 100 PERCENT BY WEIGHT (3-ACRYLAMIDO-3METHYL) BUTYL TRIMETHYL AMMONIUM CHLORIDE AND FROM 0 TO ABOUT 99 WEIGHT PERCENT ACRYLAMIDE.
Claim 2
Dependent Claim
82 words
AN IMPROVED METHOD FOR HYDRAULICALLY FRACTURING AN EARTH FORMATION PENETRATED BY A WELL COMPRISING INJECTING AN AQUEOUS FRACTURING FLUID DOWN THE WELL INTO THE EARTH FORMATION UNDER PRESSURE TO CAUSE FRACTURING OF THE EARTH FORMATION WHEREIN THE IMPROVEMENT COMPRISES TREATING THE AQEUOUS FRACTURING FLUID PRIOR TO INJECTION WITH AN EFFECTIVE AMOUNT OF A RANDOM, LINEAR, WATER-SOLUBLE POLYMER CONSISTING ESSENTIALLY OF FROM ABOUT 1.0 TO 100 PERCENT BY WEIGHT (3-ACRYLAMIDO-3METHYL) BUTYL TRIMETHYL AMMONIUM CHLORIDE AND FROM 0 TO ABOUT 99 WEIGHT PERCENT ACRYLAMIDE.
Claim 3
Dependent Claim
28 words
A method of claim 1 wherein the amount of polymer employed is about 10 to 1,000 ppm by weight based on the weight of the aqueous fracturing fluid.
Claim 4
Dependent Claim
17 words
A method of claim 2 wherein the polymer has a molecular weight of at least about 1,000,000.
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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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |