US3667544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dumbell scraper
Assignee: Shell USA Inc
•
Filing: 1970-09-09
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Granted: 1972-06-06
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Expires: 1990-09-09
Abstract
Abstract A dumbell-shaped paraffin scraper of a type that may be pumped through a paraffin coated portion of a well flow line in order to remove the paraffin.
Inventors
- 👤 Willard F Allimon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:59
CPC Classifications
B; B08; B08B; B08B9/00; B08B9/02; B08B9/027; B08B9/04; B08B9/053; B08B9/055; B08B9/0554; E; E21; E21B; E21B37/00; E21B37/02; E21B37/04; E21B37/045
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
262 words
An apparatus for scraping paraffin deposits from the interior of a tubular pipe comprising: an elongate scraper body having a longitudinal axis at least twice as long as the internal diameter of the tubular pipe; said scraper body comprising a first scraper member having a curved scraping surface of substantially circular cross section when taken in a plane perpendicular to the longitudinal axis of said scraper body and of at least partially curved cross section when taken in a plane parallel to said axis; a second scraper member having a curved scraping surfaCe of substantially circular cross section when taken in a plane perpendicular to the longitudinal axis of said elongate scraper body and of at least partially curved cross section when taken in a plane parallel to said axis; and an elongate connector member operatively connected to said first scraper member and said scraper member, said elongate connector member having a maximum cross sectional thickness perpendicular to the longitudinal axis of said scraper body less than the maximum diameter of said first and second scraper members when taken in a parallel plane; said first and second scraper members each being provided with a number of slots which extend along the surface of said scraper members longitudinally in a direction substantially paralleled to the longitudinal axis of said scraper body and which are recessed into said scraper members in a radial direction with respect to the substantially circular cross section of said scraper members a sufficient distance to allow said scraper members to flex when encountering an obstruction in the well tubing.
Claim 2
Independent Claim
262 words
An apparatus for scraping paraffin deposits from the interior of a tubular pipe comprising: an elongate scraper body having a longitudinal axis at least twice as long as the internal diameter of the tubular pipe; said scraper body comprising a first scraper member having a curved scraping surface of substantially circular cross section when taken in a plane perpendicular to the longitudinal axis of said scraper body and of at least partially curved cross section when taken in a plane parallel to said axis; a second scraper member having a curved scraping surfaCe of substantially circular cross section when taken in a plane perpendicular to the longitudinal axis of said elongate scraper body and of at least partially curved cross section when taken in a plane parallel to said axis; and an elongate connector member operatively connected to said first scraper member and said scraper member, said elongate connector member having a maximum cross sectional thickness perpendicular to the longitudinal axis of said scraper body less than the maximum diameter of said first and second scraper members when taken in a parallel plane; said first and second scraper members each being provided with a number of slots which extend along the surface of said scraper members longitudinally in a direction substantially paralleled to the longitudinal axis of said scraper body and which are recessed into said scraper members in a radial direction with respect to the substantially circular cross section of said scraper members a sufficient distance to allow said scraper members to flex when encountering an obstruction in the well tubing.
Claim 3
Dependent Claim
33 words
The apparatus of claim 1 including: through-bore means passing axially through said scraper body whereby a fluid may flow through said through-bore means; and check valve means operatively associated with said through-bore means.
Claim 4
Dependent Claim
18 words
The apparatus of claim 1 wherein at least some of said slots are filled with a rubberlike material.
Claim 5
Dependent Claim
231 words
An improved apparatus for scraping paraffin deposits from the interior of tubular pipe of the type comprising an elongate scraper body having a longitudinal axis at least twice as long as the internal diameter of the tubular pipe; said scraper body comprising first and second scraper members having a curved scraping surface of substantially circular cross section when taken in a plane perpendicular to the longitudinal axis of said scraper body and of at least partially curved cross section when taken in a plane parallel to said axis; and an elongate connector member operatively connected to said first scraper member and said second scraper member, said elongate connector member having a maximum cross sectional thickness perpendicular to the longitudinal axis of said scraper body less than the maximum diameter of said first and second scraper members when taken in a parallel plane, the improvement comprising: provided in at least one of said first and second scraper members, a circumferential groove adapted to accept a substantially circular flex ring; at least one substantially circular flex ring operatively positioned in said groove whereby said flex ring may expand or contract as said apparatus passes through a pipeline of varying internal diameter to scrape the internal walls of said pipeline; and a flexible sand seal means disposed in said groove beneath said flex ring to prevent matter from being deposited beneath said flex ring.
Claim 6
Dependent Claim
231 words
An improved apparatus for scraping paraffin deposits from the interior of tubular pipe of the type comprising an elongate scraper body having a longitudinal axis at least twice as long as the internal diameter of the tubular pipe; said scraper body comprising first and second scraper members having a curved scraping surface of substantially circular cross section when taken in a plane perpendicular to the longitudinal axis of said scraper body and of at least partially curved cross section when taken in a plane parallel to said axis; and an elongate connector member operatively connected to said first scraper member and said second scraper member, said elongate connector member having a maximum cross sectional thickness perpendicular to the longitudinal axis of said scraper body less than the maximum diameter of said first and second scraper members when taken in a parallel plane, the improvement comprising: provided in at least one of said first and second scraper members, a circumferential groove adapted to accept a substantially circular flex ring; at least one substantially circular flex ring operatively positioned in said groove whereby said flex ring may expand or contract as said apparatus passes through a pipeline of varying internal diameter to scrape the internal walls of said pipeline; and a flexible sand seal means disposed in said groove beneath said flex ring to prevent matter from being deposited beneath said flex ring.
Claim 7
Dependent Claim
18 words
The apparatus of claim 5 wherein at least some of said slots are filled with a rubberlike material.
Claim 8
Independent Claim
178 words
An apparatus for scraping deposits from the interior of a tubular pipe comprising an elongate scraper body formed from a wear resistant material and having a longitudinal axis of symmetry at least twice as long as the internal diameter of the pipe to be scraped; said scraper body comprising two scraper members the surfaces of which at least partially conform to the shape of an ellipsoid-like body and which have a substantially circular cross section in a plane perpendicular to the longitudinal axis of the apparatus; said scraper body also comprising a connector member of substantially reduced radial thickness operatively connected to said scraper members whereby said apparatus may negotiate bends in said pipe; at least one of said scraper members being provided with a number of elongate slots which run parallel to the longitudinal axis of symmetry of the scraper body and at least some of which slots extend in a radial direction from said axis of symmetry completely through said scraper member to Allow said scraper member to flex when encountering an obstruction in said pipe.
Claim 9
Independent Claim
178 words
An apparatus for scraping deposits from the interior of a tubular pipe comprising an elongate scraper body formed from a wear resistant material and having a longitudinal axis of symmetry at least twice as long as the internal diameter of the pipe to be scraped; said scraper body comprising two scraper members the surfaces of which at least partially conform to the shape of an ellipsoid-like body and which have a substantially circular cross section in a plane perpendicular to the longitudinal axis of the apparatus; said scraper body also comprising a connector member of substantially reduced radial thickness operatively connected to said scraper members whereby said apparatus may negotiate bends in said pipe; at least one of said scraper members being provided with a number of elongate slots which run parallel to the longitudinal axis of symmetry of the scraper body and at least some of which slots extend in a radial direction from said axis of symmetry completely through said scraper member to Allow said scraper member to flex when encountering an obstruction in said pipe.
References Cited (Backward Citations)
US604058A
Cited
US1278823A
Cited
US1371792A
Cited
US1756378A
Cited
US2810143A
Cited
US3052302A
Cited
US3091294A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |