US4522731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic fracturing propping agent
Assignee: STANDARD OIL PROPPANTS LP A LP
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Filing: 1982-10-28
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Granted: 1985-06-11
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Expires: 2002-10-28
Abstract
Abstract A high strength propping agent for use in hydraulic fracturing of subterranean formations comprising solid, spherical particles having an alumina content of between 40 and 60%, a density of less than 3.0 gm/cc and an ambient temperature permeability of 100,000 or more millidarcies at 10,000 psi.
Inventors
- 👤 Eugene P. Lunghofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:44
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; E21B43/267; B; B01; B01J; B01J2/00; B01J2/16; C; C01; C01F; C01F7/00; C01F7/02; C01F7/30; C09; C09K; C09K8/00; C09K8/60; C09K8/80; C01P; C01P2006/00; C01P2006/10; C01P2006/32; C01P2006/80; Y; Y10; Y10S; Y10S507/00; Y10S507/906; Y10S507/922; Y10S507/924
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
69 words
In a hydraulic fracturing method in which a fluid is injected into a subterranean formation to open a fracture therein, the improvement wherein said fracture is propped open with a high strength propping agent comprising solid, spherical particles, said particles having an alumina content of between 40 and 60%, a density of less than 3.0 gm/cc, and an ambient temperature permeability of 100,000 or more millidarcies at 10,000 psi.
Claim 2
Dependent Claim
69 words
In a hydraulic fracturing method in which a fluid is injected into a subterranean formation to open a fracture therein, the improvement wherein said fracture is propped open with a high strength propping agent comprising solid, spherical particles, said particles having an alumina content of between 40 and 60%, a density of less than 3.0 gm/cc, and an ambient temperature permeability of 100,000 or more millidarcies at 10,000 psi.
Claim 3
Dependent Claim
21 words
The hydraulic fracturing method of claim 1 wherein the subterranean formation is a high closure stress (10,000 psi or greater) formation.
Claim 4
Dependent Claim
19 words
The hydraulic fracturing method of claim 1 wherein the subterranean formation is a medium closure stress (6,000-10,000 psi) formation.
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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) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |