US4098698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic recovery system for plugs and excavation materials
Assignee: Foraco Forage Rationnel Construction
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Filing: 1976-09-20
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Granted: 1978-07-04
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Expires: 1996-09-20
Abstract
Abstract The present invention relates to a system for automatically recovering the entirety of the excavated materials in the order in which they are raised to the surface. The excavated materials being delivered through the central passage of a double pipe system pass into a strainer pipe 6 discharging into a perforated recovery sheath 5 which is closed at its base. A decompression sleeve 3 encloses the strainer pipe. Air and water are evacuated through the strainer slots 6 and all the excavated materials are deposited at 5 in the order in which they are brought up. The invention is applicable to any reverse circulation drilling system.
Inventors
- 👤 Andre Lamothe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:17
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/02; E21B21/00; E21B21/12; E21B21/16; E21B27/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
144 words
An automatic recovery system for materials excavated during a drilling or plug removing operation comprising pipe means adapted to be connected to the inner pipe of a two pipe pressurized drilling system for receiving and conveying said materials, a strainer pipe having one end connected to said pipe means having a plurality of relatively fine slots disposed about the circumference thereof through which the pressurizing medium may be dissipated, a recovery sheath having a closed end and an open end connected to the other end of said strainer pipe for receiving and holding said materials and a sleeve open at at least one end secured to said strainer pipe and disposed in radially outwardly spaced concentric relation to said strainer pipe and said sheath for limiting the dissipation of the pressurizing medium and collecting fine loose material which may have passed through said slots.
Claim 2
Dependent Claim
144 words
An automatic recovery system for materials excavated during a drilling or plug removing operation comprising pipe means adapted to be connected to the inner pipe of a two pipe pressurized drilling system for receiving and conveying said materials, a strainer pipe having one end connected to said pipe means having a plurality of relatively fine slots disposed about the circumference thereof through which the pressurizing medium may be dissipated, a recovery sheath having a closed end and an open end connected to the other end of said strainer pipe for receiving and holding said materials and a sleeve open at at least one end secured to said strainer pipe and disposed in radially outwardly spaced concentric relation to said strainer pipe and said sheath for limiting the dissipation of the pressurizing medium and collecting fine loose material which may have passed through said slots.
Claim 3
Dependent Claim
40 words
An automatic recovery system as set forth in claim 1, wherein said strainer pipe is connected to said pipe means and said sheath by disengageable connecting means to provide for the interchangeability of strainer pipes having different size slots therein.
Claim 4
Dependent Claim
21 words
An automatic recovery system as set forth in claim 1, wherein said recovery sheath is provided with a plurality of perforations.
References Cited (Backward Citations)
US1645364A
Cited
US3291229A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |