Pressure opened circulating sleeve
Abstract
Abstract A VALVE FOR USE IN A STRING OF TUBING SUSPENDED IN A WELL BORE. A TUBULAR SUB HAVING A FIRST PORT IN THE WALL THEREOF IS CONNECTED INTO THE TUBING STRING. A FIRST SLEEVE VALVE SURROUNDS THE TUBULAR MEMBER AND IN ITS UPER POSITION OPENS THE PORT AND IN ITS LOWER POSITION CLOSES THE PORT. AN UPPER FLUID-DRIVEN PISTON IS USED TO DRIVE THE SLEEVE VALVE DOWN AND A LOWER FLUID-DRIVEN PISTON IS USED TO DRIVE THE SLEEVE UPWARD. THE PISTONS ARE SPRING BIASED AWAY FROM THE SLEEVE VALVE, ONE OF THE SPRINGS HAVING ABOUT TWICE THE COMPRESSIVE RESISTANCE OF THE OTHER. APPLI- CATION OF SELECTED PRESSURES TO THE PISTONS WILL CAUSE THE RIGHT PISTON TO MOVE IN THE REQUIRED DIRECTION TO OPEN OR CLOSE THE SLEEVE VALVE. THERE IS PROVIDED A RETRIEVABLE INSERTABLE TOOL COMPRISING (A) A SLEEVE HAVING A PORT ALIGNED WITH THE FIRST PORT IN THE SUB AND (B) A SECOND SLEEVE VALVE INSIDE THE SLEEVE FOR OPENING AND CLOSING THIS PORT.
Inventors
- 👤 John H Ecuer
Bibliographic Details
Claims Analysis
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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) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |