Patent US3760878A successfully refreshed from Google Patents.
US3760878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perforations washing tool
Assignee: BP America Production Co
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Filing: 1972-03-16
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Granted: 1973-09-25
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Expires: 1992-03-16
Abstract
Abstract This invention concerns a tool for washing perforations in a casing set in a well bore. It includes a cylindrical housing having an upper port, and a lower port. The housing is connected to the lower end of a string of tubing hung from the well bore. The housing has various packers and passages so that cleaning fluid circulated down the annulus between the tubing string and casing flows in through the first port and out the second port through perforations at the same level as the second port. The cleaning fluid returns through lower perforations in the casing carrying sand or other plugging material with it and is returned up the tubing string.
Inventors
- 👤 R Peevey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:39
CPC Classifications
E; E21; E21B; E21B37/00; E21B37/08; E21B33/00; E21B33/10; E21B33/12; E21B33/124; E21B33/126
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
141 words
An apparatus for washing perforations in a casing set in a well bore and for connecting to the lower end of a tubular member suspended in the casing which comprises: a cylindrical housing having an upper port and a lower port in the walls thereof, a first packer surrounding said housing and placed below said upper port, a second packer surrounding said housing and positioned below said first packer and above said lower port, a third packer surrounding said housing and positioned below said lower port, a first chamber at the upper end of said housing and containing means connectable into said tubular member, a second chamber at the lower end of said housing and open at its lower end to the interior of the casing immediately below said third packer, a passage means extending between said first and second chamber.
Claim 2
Independent Claim
141 words
An apparatus for washing perforations in a casing set in a well bore and for connecting to the lower end of a tubular member suspended in the casing which comprises: a cylindrical housing having an upper port and a lower port in the walls thereof, a first packer surrounding said housing and placed below said upper port, a second packer surrounding said housing and positioned below said first packer and above said lower port, a third packer surrounding said housing and positioned below said lower port, a first chamber at the upper end of said housing and containing means connectable into said tubular member, a second chamber at the lower end of said housing and open at its lower end to the interior of the casing immediately below said third packer, a passage means extending between said first and second chamber.
Claim 3
Dependent Claim
40 words
An apparatus as defined in claim 1 in which said first packer is a cup type packer facing up, said second packer is a cup type packer facing down and said third packer is a cup type packer facing up.
Claim 4
Dependent Claim
23 words
An apparatus as defined in claim 1 including an orifice in the wall of said housing between said first and said second packers.
Claim 5
Dependent Claim
21 words
An apparatus as defined in claim 1 including a valve means between the first chamber and the exterior of said housing.
Claim 6
Dependent Claim
27 words
An apparatus as defined in claim 2 and including a flow restriction means in the wall of said housing between said first packer and said second packer.
Claim 7
Dependent Claim
16 words
An apparatus as defined in claim 5 in which said flow restriction means is an orifice.
Claim 8
Dependent Claim
25 words
An apparatus as defined in claim 4 in which said valve means permits only unidirectional flow from within said first chamber to the exterior thereof.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |