Patent US4350505A successfully refreshed from Google Patents.
US4350505A
Expired / Lapsed
US
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Device for reduction of oxygen content in drilling fluid
Assignee: Loffland Brothers Co
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Filing: 1978-08-28
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Granted: 1982-09-21
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Expires: 1998-08-28
Abstract
Abstract A method and means for using nitrogen exhaust gases or gaseous mixtures of combustible products for reduction of oxygen in drilling fluids during the drilling of well bores and which comprises utilizing nitrogen from normally waste exhaust gases or the like, injecting the nitrogen and other gases present into the usual drilling muds for replacing the oxygen contents of the drilling muds with the nitrogen gas, whereby corrosive action of the drilling muds is greatly reduced or substantially eliminated.
Inventors
- 👤 Harvey E. Mallory
- 👤 James W. Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:56
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/14; E21B21/06; E21B21/063; E21B21/067
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
256 words
A device for treating gases containing nitrogen for utilizing the nitrogen for reduction of oxygen content in well bore drilling fluids and comprising housing means, a chamber provided in said housing means and having a suitable filter material disposed therein to provide a filter chamber, a chamber provided in said housing means below said filter chamber and having a suitable liquid disposed therein to provide a liquid bath chamber, a stand-pipe means disposed in said housing means and providing communication between said filter chamber and said liquid bath chamber, level control means for controlling the level of the liquid bath in said liquid bath chamber, first discharge means in communication with said liquid bath for discharge of said liquid bath, second discharge means in communication with the liquid bath chamber and disposed above the upper level of the liquid bath, means disposed in said liquid bath chamber and disposed above the upper level of the liquid bath to provide a tortuous path of travel between the liquid bath and the second discharge means, inlet means providing access to the interior of said filter chamber for admitting the nitrogen containing gases thereto, and means operably connected with said second discharge means for creating a suction within said housing means for pulling said gases through the filter chamber and liquid bath for removing unwanted debris from the gases and discharging clean gases from said device, and including spreader plate means disposed in said filter chamber for dispersing the exhaust gases upon initial entry thereof into the filter chamber.
Claim 2
Independent Claim
256 words
A device for treating gases containing nitrogen for utilizing the nitrogen for reduction of oxygen content in well bore drilling fluids and comprising housing means, a chamber provided in said housing means and having a suitable filter material disposed therein to provide a filter chamber, a chamber provided in said housing means below said filter chamber and having a suitable liquid disposed therein to provide a liquid bath chamber, a stand-pipe means disposed in said housing means and providing communication between said filter chamber and said liquid bath chamber, level control means for controlling the level of the liquid bath in said liquid bath chamber, first discharge means in communication with said liquid bath for discharge of said liquid bath, second discharge means in communication with the liquid bath chamber and disposed above the upper level of the liquid bath, means disposed in said liquid bath chamber and disposed above the upper level of the liquid bath to provide a tortuous path of travel between the liquid bath and the second discharge means, inlet means providing access to the interior of said filter chamber for admitting the nitrogen containing gases thereto, and means operably connected with said second discharge means for creating a suction within said housing means for pulling said gases through the filter chamber and liquid bath for removing unwanted debris from the gases and discharging clean gases from said device, and including spreader plate means disposed in said filter chamber for dispersing the exhaust gases upon initial entry thereof into the filter chamber.
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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) | 1985-09-20 | 1986-03-22 | 1986-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-20 | 1990-03-22 | 1990-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-20 | 1994-03-22 | 1994-09-21 | $7700.00 | Window Closed / Lapsed |