US3981359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centralizer element for well screen
Assignee: Honeywell UOP LLC
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Filing: 1975-10-21
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Granted: 1976-09-21
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Expires: 1995-10-21
Abstract
Abstract Centralizer assembly for an oil well screen has two identical halves which are fastened together around a well screen to permit the well screen to be properly centered within a tubular well casing. A shoulder or lip at one end of the centralizer engages a recess adjacent the end of the well screen to limit axial movement of the centralizer relative to the well screen.
Inventors
- 👤 Dewitt L. Fortenberry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:19
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1078; E21B43/00; E21B43/02; E21B43/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
239 words
A centralizer for axially centering a well screen within a tubular well casing, said centralizer comprising a pair of identical housing portions having a generally semi-cylindrical, annular wall cross-section along substantially the entire axial length thereof, one end of said wall having an integral, inwardly extending lip portion formed thereon, a pair of integral, outwardly extending flange portions formed in a common plane and extending from each side edge of said housing portions, each one of said pair of flange portions having an aperture therein so that when a pair of housing portions are positioned opposite each other and in surrounding relation to a well screen, fastener members can pass through said apertures to clamp said housing portions together, and an outwardly extending flange portion on each housing portion arranged between said pair of flange portions, each of said flange portions extending about the same distance from the inner wall of said housing portions so as to center a well screen to which said housing portions are adapted to be clamped within a well casing which is just slightly larger in internal diameter than the distance between the tips of any pair of flange portions lying in a common plane, said lip portions being adapted to fit into a recessed area of limited axial extent adjacent the end of a well screen to prevent axial shifting of said centralizer relative to a well screen to which it is clamped.
Claim 2
Dependent Claim
239 words
A centralizer for axially centering a well screen within a tubular well casing, said centralizer comprising a pair of identical housing portions having a generally semi-cylindrical, annular wall cross-section along substantially the entire axial length thereof, one end of said wall having an integral, inwardly extending lip portion formed thereon, a pair of integral, outwardly extending flange portions formed in a common plane and extending from each side edge of said housing portions, each one of said pair of flange portions having an aperture therein so that when a pair of housing portions are positioned opposite each other and in surrounding relation to a well screen, fastener members can pass through said apertures to clamp said housing portions together, and an outwardly extending flange portion on each housing portion arranged between said pair of flange portions, each of said flange portions extending about the same distance from the inner wall of said housing portions so as to center a well screen to which said housing portions are adapted to be clamped within a well casing which is just slightly larger in internal diameter than the distance between the tips of any pair of flange portions lying in a common plane, said lip portions being adapted to fit into a recessed area of limited axial extent adjacent the end of a well screen to prevent axial shifting of said centralizer relative to a well screen to which it is clamped.
Claim 3
Dependent Claim
45 words
A centralizer in accordance with claim 1 wherein each of said flange portions has a cross section in the axial plane of the centralizer which progressively increases in radial dimension as one proceeds in a direction from the ends of the centralizer toward its center.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-21 | 1980-03-22 | 1980-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-21 | 1984-03-22 | 1984-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-21 | 1988-03-22 | 1988-09-21 | $7700.00 | Window Closed / Lapsed |