US2859819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic fracturing with overflushing
Assignee: California Research LLC
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Filing: 1957-04-25
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Granted: 1958-11-11
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Expires: 1977-04-25
Abstract
No abstract record available.
Inventors
- 👤 Donald E Trott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:58
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/25; E21B43/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
THE METHOD FOR INCREASING THE PRODUCTIVITY OF A SUBTERRANEAN FORMATION PENETRATED BY A WELL BY HYDRAULIC FRACTURING COMPRISING THE STEPS OF PUMPING, UNDER INCREASING PRESSURE, A FRACTURING LIQUID HAVING SAND SUSPENDED THEREIN INTO A CONFINED ZONE IN SAID WELL UNTIL SAID FRACTURING OCCURS, MAINTAINING A DECREASED PRESSURE ON SAID FRACTURING LIQUID AFTER FRACTURING OCCURS, SUBSEQUENTLY INJECTING INTO SAID FORMATION AT A PRESSURE AND AN INJECTION RATE NO GREATER THAN ONE-HALF THE AVERAGE PRESSURE AND THE AVERAGE INJECTION RATE USED DURING SAID FRACTURING A FIRST OVERFLUSHING LIQUID HAVING A VISCOSITY SUFFICIENT TO CARRY AWAY FROM THE PORTION OF SAID FORMATION ADJACENT SAID WELL PARTICLES ABRADED LOOSE DURING SAID FRACTURING, AND THEN INJECTING INTO SAID FORMATION AT A PRESSURE AND AN INJECTION RATE NO GREATER THAN ONE-HALF THE AVERAGE PRESSURE AND THE AVERAGE INJECTION RATER USED DURING SAID FRACTURING A SECOND OVERFLUSING LIQUID HAVING A VISCOSITY APPRECIABLY LOWER THAN SAID FIRST OVERFLUSING LIQUID TO DISPLACE SAID FIRST OVERFLUSING LIQIUD FROM THE PORTION OF SAID FORMATION ADJACENT SAID WELL BORE.
Claim 2
Independent Claim
167 words
THE METHOD FOR INCREASING THE PRODUCTIVITY OF A SUBTERRANEAN FORMATION PENETRATED BY A WELL BY HYDRAULIC FRACTURING COMPRISING THE STEPS OF PUMPING, UNDER INCREASING PRESSURE, A FRACTURING LIQUID HAVING SAND SUSPENDED THEREIN INTO A CONFINED ZONE IN SAID WELL UNTIL SAID FRACTURING OCCURS, MAINTAINING A DECREASED PRESSURE ON SAID FRACTURING LIQUID AFTER FRACTURING OCCURS, SUBSEQUENTLY INJECTING INTO SAID FORMATION AT A PRESSURE AND AN INJECTION RATE NO GREATER THAN ONE-HALF THE AVERAGE PRESSURE AND THE AVERAGE INJECTION RATE USED DURING SAID FRACTURING A FIRST OVERFLUSHING LIQUID HAVING A VISCOSITY SUFFICIENT TO CARRY AWAY FROM THE PORTION OF SAID FORMATION ADJACENT SAID WELL PARTICLES ABRADED LOOSE DURING SAID FRACTURING, AND THEN INJECTING INTO SAID FORMATION AT A PRESSURE AND AN INJECTION RATE NO GREATER THAN ONE-HALF THE AVERAGE PRESSURE AND THE AVERAGE INJECTION RATER USED DURING SAID FRACTURING A SECOND OVERFLUSING LIQUID HAVING A VISCOSITY APPRECIABLY LOWER THAN SAID FIRST OVERFLUSING LIQUID TO DISPLACE SAID FIRST OVERFLUSING LIQIUD FROM THE PORTION OF SAID FORMATION ADJACENT SAID WELL BORE.
References Cited (Backward Citations)
US2596843A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-10 | 1962-05-12 | 1962-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-10 | 1966-05-12 | 1966-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-10 | 1970-05-12 | 1970-11-11 | $7700.00 | Window Closed / Lapsed |