Patent US3667544A successfully refreshed from Google Patents.
US3667544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dumbell scraper
Assignee: Shell USA Inc
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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 20:56
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.
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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) | 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 |