US3139930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of and apparatus for fracturing
Assignee: ConocoPhillips Co
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Filing: 1962-01-08
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Granted: 1964-07-07
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Expires: 1982-01-08
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles M Hudgins
- 👤 Robert L Mcglasson
- 👤 Walton D Greathouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:59
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; E21B43/2605
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A METHOD FOR FRACTURING A SUBSURFACE FORMATION FROM A WELL BORE COMPRISING THE STEPS OF: PLACING A PISTON IN THE WELL BORE AT A POSITION SUBSTANTIALLY ABOVE THE FORMATION; PLACING IN THE WELL BORE BELOW THE PISTON A GAS AT A FIRST PRESSURE; INCREASING THE PRESSURE OF FLUIDS IN THE WELL BORE ABOVE THE PISTON TO A SUBSTANTIALLY GREATER PRESSURE THAN THE FIRST PRESSURE WHILE SUPPORTING THE PISTON AT SAID POSITION; AND, RELEASING THE PISTON; WHEREBY THE PRESSURE OF THE FLUIDS ABOVE THE PISTON FORCE THE PISTON RAPIDLY DOWNWARDLY TO PRODUCE AN
Claim 2
Independent Claim
92 words
A METHOD FOR FRACTURING A SUBSURFACE FORMATION FROM A WELL BORE COMPRISING THE STEPS OF: PLACING A PISTON IN THE WELL BORE AT A POSITION SUBSTANTIALLY ABOVE THE FORMATION; PLACING IN THE WELL BORE BELOW THE PISTON A GAS AT A FIRST PRESSURE; INCREASING THE PRESSURE OF FLUIDS IN THE WELL BORE ABOVE THE PISTON TO A SUBSTANTIALLY GREATER PRESSURE THAN THE FIRST PRESSURE WHILE SUPPORTING THE PISTON AT SAID POSITION; AND, RELEASING THE PISTON; WHEREBY THE PRESSURE OF THE FLUIDS ABOVE THE PISTON FORCE THE PISTON RAPIDLY DOWNWARDLY TO PRODUCE AN
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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) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |