Patent US3874231A successfully refreshed from Google Patents.
US3874231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffusion barrier chamber for sperry sun permagage type pressure gage
Assignee: ConocoPhillips Co
•
Filing: 1973-12-19
•
Granted: 1975-04-01
•
Expires: 1993-12-19
Abstract
Abstract An improvement in devices for detecting pressure and pressure changes in subterranean formations is shown. The devices comprise a chamber positioned in the wellbore and a tubular means which is in fluid communication with the chamber and a pressure sensing device. The improvement comprises positioning a baffle, a coil, or the like in the chamber to prevent the mixture of formation fluids with fluids contained in the tubular section.
Inventors
- 👤 Jr Herbert C Walther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:31
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
143 words
In a device for detecting pressure and pressure changes in a subterranean formation penetrated by a wellbore, said device including a chamber means positioned in said wellbore and in fluid communication with said formation, and a tubular means in fluid communication with said chamber means and in fluid communication with a means for detecting pressure and pressure changes in said wellbore, the improvement comprising; providing means in fluid communication with said tubular means and said formation for preventing the mixture of formation fluids with fluids contained in said tubular means, said means comprising an extended flow path in fluid communication with the lower end of said tubular means and said formation, said extended flow path being positioned to fluidly transmit pressure changes to said tubular means and prevent the entry of formation fluids into said tubular means upon changes in the formation pressure.
Claim 2
Dependent Claim
143 words
In a device for detecting pressure and pressure changes in a subterranean formation penetrated by a wellbore, said device including a chamber means positioned in said wellbore and in fluid communication with said formation, and a tubular means in fluid communication with said chamber means and in fluid communication with a means for detecting pressure and pressure changes in said wellbore, the improvement comprising; providing means in fluid communication with said tubular means and said formation for preventing the mixture of formation fluids with fluids contained in said tubular means, said means comprising an extended flow path in fluid communication with the lower end of said tubular means and said formation, said extended flow path being positioned to fluidly transmit pressure changes to said tubular means and prevent the entry of formation fluids into said tubular means upon changes in the formation pressure.
Claim 3
Dependent Claim
82 words
The improvement of claim 1 wherein said means for preventing the mixture of formation fluids with fluids contained in said tubular means is a baffle means positioned in said chamber means and having an inlet and an outlet so that said inlet to said baffle means is in fluid communication with said formation, said outlet from said baffle means is in fluid communication with said tubular means and the flow path between said inlet and said outlet is at least 50 feet.
Claim 4
Dependent Claim
10 words
The improvement of claim 2 wherein said fluids are gases.
Claim 5
Dependent Claim
81 words
The improvement of claim 1 wherein said means for preventing the mixture of formation fluids with fluids contained in said tubular means is a coil means positioned in said chamber means anD having an inlet and an outlet so that said inlet to said coil means is in fluid communication with said formation, said outlet from said coil is in fluid communication with said tubular means and the flow path between said inlet and said outlet is at least 50 feet.
Claim 6
Dependent Claim
25 words
The improvement of claim 4 wherein said coil means has a volume equal to from 0.1 to 10 times the volume of the tubular means.
Claim 7
Dependent Claim
10 words
The improvement of claim 5 wherein said fluids are gases.
Claim 8
Dependent Claim
18 words
The method of claim 1 wherein said extended flow path is positioned to have a minimal pressure gradient.
Claim 9
Dependent Claim
19 words
The method of claim 7 wherein said extended flow path comprises a plurality of substantially horizontal flow path sections.
References Cited (Backward Citations)
US2855780A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |