US3739847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination well bailer and swab
Assignee: Individual
•
Filing: 1971-10-06
•
Granted: 1973-06-19
•
Expires: 1991-10-06
Abstract
Abstract A combination well bailer and swab having a plunger slidably disposed in the body of the bailer and a swab cup supporting mandrel secured to the lower end of the bailer with an overload relief valve disposed below the swab cup. Ports are provided through the swab mandrel above the swab cup, communicating with the annulus exteriorly of the swab mandrel, with an upwardly opening flapper check valve between the ports and the plunger so that upon upward movement of the plunger the flapper valve is opened, drawing fluid interiorly of the body from above the swab cup, thereby drawing suspended sand and other foreign material into the body where it may be collected or expelled, and an undue accumulation of sand within the body will open the safety relief valve and dump same into the well below the swab cup.
Inventors
- 👤 J Reynolds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:31
CPC Classifications
E; E21; E21B; E21B27/00; E21B37/00; E21B37/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
69 words
In a well tool, a tubular body having a plunger assembly slidably disposed in the bore; one or more perforations provided Through the wall of the body; a swab cup about the body below the perforations; an upwardly opening check valve in the body between the perforations and the plunger; and a check valve below the swab cup arranged to open downwardly when a predetermined pressure is imposed thereon.
Claim 2
Dependent Claim
69 words
In a well tool, a tubular body having a plunger assembly slidably disposed in the bore; one or more perforations provided Through the wall of the body; a swab cup about the body below the perforations; an upwardly opening check valve in the body between the perforations and the plunger; and a check valve below the swab cup arranged to open downwardly when a predetermined pressure is imposed thereon.
Claim 3
Dependent Claim
135 words
In a combination plunger and well swab, a hollow barrel; a plunger in the barrel; a head on the barrel having a central passage therethrough; a stem attached to the plunger movably extending through the passage, the stem being smaller in diameter than the central passage to provide an annular restricted flow passage thereabout; a central passage through the plunger communicating with area above and below the plunger; an upwardly opening check valve in the passage through the plunger; a swab assembly suspended to the barrel, said swab assembly including a tubular body having perforations through the wall thereof; a swab cup disposed about the body below the perforations; a downwardly opening check valve in the body below the swab cup; and passage means through the lower end of the body below the check valve.
Claim 4
Dependent Claim
135 words
In a combination plunger and well swab, a hollow barrel; a plunger in the barrel; a head on the barrel having a central passage therethrough; a stem attached to the plunger movably extending through the passage, the stem being smaller in diameter than the central passage to provide an annular restricted flow passage thereabout; a central passage through the plunger communicating with area above and below the plunger; an upwardly opening check valve in the passage through the plunger; a swab assembly suspended to the barrel, said swab assembly including a tubular body having perforations through the wall thereof; a swab cup disposed about the body below the perforations; a downwardly opening check valve in the body below the swab cup; and passage means through the lower end of the body below the check valve.
Claim 5
Dependent Claim
22 words
The combination called for in claim 2 with the addition of an upwardly opening check valve in the body above the perforations.
Claim 6
Dependent Claim
34 words
The combination called for in claim 2 with the addition of an enlarged head on the plunger engageable with the lower end of the passage through the head to allow retrieval of the tool.
Claim 7
Dependent Claim
67 words
The combination called for in claim 2 wherein the barrel is threadedly engaged with the swab body; and a plurality of radially arranged closed end passages in the head communicating with the central passage through the head arranged to receive pressure from the said passage when the plunger is raised to apply torque to the barrel to tighten the threaded connection between the barrel and the body.
Claim 8
Dependent Claim
98 words
In a well tool, a tubular body having a plunger assembly slidably disposed in the bore; a head on the upper end of the body, said head having a passage therethrough; a stem on the plunger assembly movable vertically in said passage, the stem being smaller in diameter than the passage to provide an annular restricted flow passage thereabout; one or more perforations provided through the wall of the body; a swab cup about the body below the perforations; and a check valve below the swab cup arranged to open downwardly when a predetermined pressure is imposed thereupon.
Claim 9
Dependent Claim
98 words
In a well tool, a tubular body having a plunger assembly slidably disposed in the bore; a head on the upper end of the body, said head having a passage therethrough; a stem on the plunger assembly movable vertically in said passage, the stem being smaller in diameter than the passage to provide an annular restricted flow passage thereabout; one or more perforations provided through the wall of the body; a swab cup about the body below the perforations; and a check valve below the swab cup arranged to open downwardly when a predetermined pressure is imposed thereupon.
Claim 10
Dependent Claim
56 words
The combination called for in claim 6 with the addition of a pair of radially disposed closed end passages in the inner wall of the head communicating with the passage through the head arranged to receive fluid pressure from said restricted passage when the plunger is moved upwardly to impart a rotative motion to the body.
Claim 11
Dependent Claim
41 words
The combination called for in claim 6 with the addition of an enlarged head on the plunger below the stem arranged to engage the passage to allow retrieval of the assembly from the well by a cable attached to the stem.
Claim 12
Dependent Claim
86 words
In a well tool, a tubular body having a plunger assembly slidably disposed in the bore, said plunger having a passage therethrough to allow communication between areas in the body above and below the plunger; an upwardly opening check valve in the passage to control flow therethrough; one or more perforations provided through the wall of the body; a swab cup about the body below the perforations; and a check valve below the swab cup arranged to open downwardly when a predetermined pressure is imposed thereupon.
Claim 13
Dependent Claim
86 words
In a well tool, a tubular body having a plunger assembly slidably disposed in the bore, said plunger having a passage therethrough to allow communication between areas in the body above and below the plunger; an upwardly opening check valve in the passage to control flow therethrough; one or more perforations provided through the wall of the body; a swab cup about the body below the perforations; and a check valve below the swab cup arranged to open downwardly when a predetermined pressure is imposed thereupon.
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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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |