Patent US4442897A successfully refreshed from Google Patents.
US4442897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formation fracturing method
Assignee: BP Corp North America Inc
•
Filing: 1982-05-13
•
Granted: 1984-04-17
•
Expires: 2002-05-13
Abstract
Abstract A method is disclosed for fracturing a subterranean formation penetrated by a wellbore, the fracturing being accomplished by first injecting into said formation a low leakoff, high efficiency fluid followed by a controlled viscosity fluid carrying propping agents.
Inventors
- 👤 Ronald F. Crowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:11
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/80; C09K8/62; C09K8/64; E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; E21B43/267
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
88 words
The method of extending a fracture in a subterranean formation, comprising injecting into a fracture in the formation through a wellbore an oil-in-water emulsion fluid at a sufficient pressure and rate to extend the fracture in said formation, followed by injecting into the fracture a cross-linked polymer gel containing a quantity of propping agents therein at a sufficient pressure and rate to extend the fracture into the formation so that said fracture is lengthened and the propping agent is carried into said formation, and shutting in the wellbore.
Claim 2
Independent Claim
88 words
The method of extending a fracture in a subterranean formation, comprising injecting into a fracture in the formation through a wellbore an oil-in-water emulsion fluid at a sufficient pressure and rate to extend the fracture in said formation, followed by injecting into the fracture a cross-linked polymer gel containing a quantity of propping agents therein at a sufficient pressure and rate to extend the fracture into the formation so that said fracture is lengthened and the propping agent is carried into said formation, and shutting in the wellbore.
Claim 3
Dependent Claim
34 words
The method of claim 1 wherein a first quantity of crosslinked polymer gel contains between about 1 lb/gal to 4 lb/gal of proppant and subsequent quantities contain at least about 3 lb/gal of proppant.
Claim 4
Dependent Claim
54 words
The method of claim 1 wherein a first quantity of polymer gel contains about 1 lb/gal to 4 lb/gal of proppant, the second quantity contains from about 3 to 6 lb/gal, the third quantity contains from about 5 to 7 lb/gal, and successive quantities contain graded amounts of proppant up to about 12 lb/gal.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein the crosslinked polymer gel has a viscosity of from between about 50-400 cp.
References Cited (Backward Citations)
US3121464A
Cited
US3172471A
Cited
US3592266A
Cited
US3710865A
Cited
US3888312A
Cited
US3977472A
Cited
US4109721A
Cited
US4156464A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-17 | 1987-10-17 | 1988-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-17 | 1991-10-17 | 1992-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-17 | 1995-10-17 | 1996-04-17 | $7700.00 | Window Closed / Lapsed |