Patent US2811209A successfully refreshed from Google Patents.
US2811209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well clean-out method
Assignee: Shell Development Co
•
Filing: 1956-04-12
•
Granted: 1957-10-29
•
Expires: 1976-04-12
Abstract
No abstract record available.
Inventors
- 👤 Randell L Elkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:17
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/52; C09K8/524; Y; Y10; Y10S; Y10S48/00; Y10S48/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A METHOD FOR REMOVING MINUTE PARTICLES OF CLOGGING MATERIALS FROM THE FACE OF A POROUS FORMATION TRAVERSED BY A WELL, SAID METHOD COMPRISING THE STEPS OF INTRODUCING A MIXTURE OF AT LEAST TWO GAS GENERATING MATERIALS INTO SAID WELL, ONE OF SAID MATERIALS GENERATING GAS BY AN EXOTHERMIC PROCESS, THE OTHER OF SAID MATERIALS GENERATING GAS BY AN ENDOTHERMIC PROCESS, SAID TWO MATERIALS BEING IN A RATIO SO THAT THE HEAT GENERATED BY THE EXOTHERMIC PROCESS IS SUBSTANTIALLY NEUTRALIZED BY THE HEAT ABSORBED BY THE ENDOTHERMIC REACTION WITHIN THE WELL AT THE LEVEL OF THE POROUS FORMATION BEING CLEANED, SHUTTING IN SAID WELL, ALLOWING PRESSURE TO BUILD UP IN SAID WELL WHEREBY A PORTION OF THE FLUID IN THE WELL IS FORCED INTO SAID POROUS FORMATION, OPENING SAID WELL AND RELEASING THE PRESSURE THEREIN WHEREBY THE FLUID FORCED INTO THE FORMATION SURGES BACK INTO THE WELL AND REMOVES THE CLOGGING MATERIALS FROM THE FACE OF THE POROUS FORMATION.
Claim 2
Independent Claim
158 words
A METHOD FOR REMOVING MINUTE PARTICLES OF CLOGGING MATERIALS FROM THE FACE OF A POROUS FORMATION TRAVERSED BY A WELL, SAID METHOD COMPRISING THE STEPS OF INTRODUCING A MIXTURE OF AT LEAST TWO GAS GENERATING MATERIALS INTO SAID WELL, ONE OF SAID MATERIALS GENERATING GAS BY AN EXOTHERMIC PROCESS, THE OTHER OF SAID MATERIALS GENERATING GAS BY AN ENDOTHERMIC PROCESS, SAID TWO MATERIALS BEING IN A RATIO SO THAT THE HEAT GENERATED BY THE EXOTHERMIC PROCESS IS SUBSTANTIALLY NEUTRALIZED BY THE HEAT ABSORBED BY THE ENDOTHERMIC REACTION WITHIN THE WELL AT THE LEVEL OF THE POROUS FORMATION BEING CLEANED, SHUTTING IN SAID WELL, ALLOWING PRESSURE TO BUILD UP IN SAID WELL WHEREBY A PORTION OF THE FLUID IN THE WELL IS FORCED INTO SAID POROUS FORMATION, OPENING SAID WELL AND RELEASING THE PRESSURE THEREIN WHEREBY THE FLUID FORCED INTO THE FORMATION SURGES BACK INTO THE WELL AND REMOVES THE CLOGGING MATERIALS FROM THE FACE OF THE POROUS FORMATION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |