Patent US3766981A successfully refreshed from Google Patents.
US3766981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sand screen sand saver
Assignee: BP America Production Co
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Filing: 1972-08-14
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Granted: 1973-10-23
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Expires: 1992-08-14
Abstract
Abstract This is a special downhole sand screen assembly for oil and other fluids containing sand. This invention is called a sand screen sand saver and was developed especially for use with multi-layer concentric sand screens in which the outer screen has larger openings to retain the coarser sand particles and the openings in the inner screen are progressively smaller to retain the less coarse sand particles. The sand screen sand saver causes the sand to be retained so that it can form a sand pack between the outer screen and the well casing.
Inventors
- 👤 R Rundt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:59
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B33/00; E21B33/10; E21B33/12; E21B33/126
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
A sand screen sand saver for use with a sand screen supported by a tubing string suspended in a casing lining a wellbore which has perforations opposite an underground producing formation which comprises a hollow cup-like member having a lower cylindrical portion, an upper cylindrical portion of larger diameter than said lower portion, an intermediate truncated cone portion connecting said lower section and said upper section, said intermediate section having a plurality of ports therethrough sloping inwardly and downwardly.
Claim 2
Dependent Claim
79 words
A sand screen sand saver for use with a sand screen supported by a tubing string suspended in a casing lining a wellbore which has perforations opposite an underground producing formation which comprises a hollow cup-like member having a lower cylindrical portion, an upper cylindrical portion of larger diameter than said lower portion, an intermediate truncated cone portion connecting said lower section and said upper section, said intermediate section having a plurality of ports therethrough sloping inwardly and downwardly.
Claim 3
Dependent Claim
14 words
An apparatus as defined in claim 1 including check valve means closing said ports.
Claim 4
Dependent Claim
47 words
An apparatus as defined in claim 2 in which L1/L2 > or = 2 where L2 is the longitudinal distance between said lower section and said upper section and L2 is the difference between the radius of said lower portion and the radius of said upper portion.
Claim 5
Dependent Claim
20 words
An apparatus as defined in claim 3 including a circumferential groove in the lower exterior portion of said intermediate section.
Claim 6
Dependent Claim
80 words
A sand screen saver for use with a sand screen supported by a tubing string suspended in a casing lining a wellbore which has perforations opposite an underground producing formation which comprises a hollow cup-like member having a lower cylindrical portion, an upper cylindrical portion of larger diameter than said lower portion, an intermediate truncated conical portion connecting said lower section and said upper section, said intermediate section including a circumferential groove in the lower part of said intermediate section.
Claim 7
Dependent Claim
80 words
A sand screen saver for use with a sand screen supported by a tubing string suspended in a casing lining a wellbore which has perforations opposite an underground producing formation which comprises a hollow cup-like member having a lower cylindrical portion, an upper cylindrical portion of larger diameter than said lower portion, an intermediate truncated conical portion connecting said lower section and said upper section, said intermediate section including a circumferential groove in the lower part of said intermediate section.
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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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |