Patent DE678887C successfully refreshed from Google Patents.
US3812911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retrievable blanking plug
Assignee: Individual
•
Filing: 1973-06-11
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Granted: 1974-05-28
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Expires: 1993-06-11
Abstract
Abstract Combination wireline fishing tool and retrievable blanking plug for use in conjunction with a seating nipple. The blanking plug has a fishing neck which extends from a shoulder located thereon. The fishing neck includes spaced overshot engaging members so that a fishing tool in the form of an overshot can be forced into engagement with either of the members. An axial counterbore extending into the blanking plug has a combination stop means and pressure relief means located therein, in the form of spaced breakable plugs. The counterbore further includes means for releasing the blanking plug from the seating nipple. Attached to the overshot in axially aligned relationship therewith is a probe arranged whereby part of the overshot must be positioned in attached relationship between the two spaced members in order for the probe to break a relief plug and equalize the pressure across the blanking plug. Part of the overshot must next be moved into a position between the shoulder and the lowermost overshot engaging member and the second breakable plug broken by the probe in order for the release device to be actuated.
Inventors
- 👤 R Vann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:50
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/02; E21B33/00; E21B33/10; E21B33/12; E21B33/13; E21B33/134
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
369 words
In a well bore having a flow conduit located therewithin and a seating nipple located in the flow conduit so that a wireline operated fishing tool can retrieve a retrievable blanking plug from the seating nipple, in combination: said plug having a main body portion for sealingly engaging the inside peripheral wall of the seating nipple, anchor means connected to said plug and being movable from an extended into a retracted position relative to said main body for engagement with the seating nipple; a fishing neck means formed on said plug, an axial passageway formed through said fishing neck means and into said main body; said fishing neck means having at least one lifting member which can be engaged by said fishing tool; said fishing tool being in the form of an overshot having a downwardly depending skirt engageable with said lifting member and a probe axially aligned with said skirt and slidably received within said axial passageway; said probe having a large outside diameter portion affixed to said overshot and a small outside diameter free end portion; release means located in said axial passageway movable by said large outside diameter portion of said probe for releasing said anchor means from the seating nipple; spaced upper and lower stop means, said upper stop means being a combination stop and pressure equalizing means, said spaced stop means being located in said passageway in underlying relationship respective to said release means in a position so that said upper stop and pressure equalizing means must be engaged by said small outside diameter portion of said probe before said release means can be engaged by the large outside diameter portion of said probe; the relative position of said lifting member, said release means, said spaced upper and lower stops, the length of said probe, and the relative position of said large and small outside diameter portion of said probe being arranged so that part of the overshot must be engaged with the lifting member in order for the probe to actuate the pressure equalizing means, and so that the probe must be positioned below the lowermost stop means in order for the large outside diameter of the probe to actuate the release means.
Claim 2
Dependent Claim
369 words
In a well bore having a flow conduit located therewithin and a seating nipple located in the flow conduit so that a wireline operated fishing tool can retrieve a retrievable blanking plug from the seating nipple, in combination: said plug having a main body portion for sealingly engaging the inside peripheral wall of the seating nipple, anchor means connected to said plug and being movable from an extended into a retracted position relative to said main body for engagement with the seating nipple; a fishing neck means formed on said plug, an axial passageway formed through said fishing neck means and into said main body; said fishing neck means having at least one lifting member which can be engaged by said fishing tool; said fishing tool being in the form of an overshot having a downwardly depending skirt engageable with said lifting member and a probe axially aligned with said skirt and slidably received within said axial passageway; said probe having a large outside diameter portion affixed to said overshot and a small outside diameter free end portion; release means located in said axial passageway movable by said large outside diameter portion of said probe for releasing said anchor means from the seating nipple; spaced upper and lower stop means, said upper stop means being a combination stop and pressure equalizing means, said spaced stop means being located in said passageway in underlying relationship respective to said release means in a position so that said upper stop and pressure equalizing means must be engaged by said small outside diameter portion of said probe before said release means can be engaged by the large outside diameter portion of said probe; the relative position of said lifting member, said release means, said spaced upper and lower stops, the length of said probe, and the relative position of said large and small outside diameter portion of said probe being arranged so that part of the overshot must be engaged with the lifting member in order for the probe to actuate the pressure equalizing means, and so that the probe must be positioned below the lowermost stop means in order for the large outside diameter of the probe to actuate the release means.
Claim 3
Dependent Claim
33 words
The combination of claim 1 wherein said lower stop means is a pressure equalizing means positioned to be actuated by said probe before the release means causes the anchor means to be retracted.
Claim 4
Dependent Claim
111 words
The combination of claim 1 wherein said anchor means is a pivoted member journaled to said main body and having opposed free ends, one free end being pivoted away from said body to provide for the anchor action while the remaining free end is pivoted into the passageway to provide for the engagement with the probe; said small outside diameter of said probe passing free of said remaining free end of said pivoted member while said large outside diameter of said probe engages and moves said remaining free end of said pivoted member so that said one free end of said pivoted member can be retracted relative to said main body.
Claim 5
Dependent Claim
73 words
The combination of claim 1 wherein said skirt member has an expandable inwardly directed lower circumferentially extending edge portion; said lifting member is in the form of an enlargement about which said skirt member is received when the skirt member is moved in a downward direction, so that the inwardly directed edge portion of the skirt can be latched onto the enlargement, to thereby provide for a lifting action respective to said plug.
Claim 6
Dependent Claim
116 words
The combination of claim 1 wherein said lower spaced stop means is a pressure equalizing means, said upper and lower pressure equalizing means being positioned to be contacted and actuated by said probe before the release means is retracted; said skirt member includes an expandable inwardly directed lower circumferentially extending edge portion; said fishing neck includes a second lifting member to provide for both an upper And a lower lifting member, said lifting members being enlargements about which said skirt member is received in latched relationship respective thereto when the skirt member is moved in a downward direction, so that the inwardly directed edge portion of the skirt can be latched onto both of the enlargements.
Claim 7
Dependent Claim
260 words
In combination, a retrievable blanking plug and a wireline operated fishing tool for use in a flow conduit located within a borehole; said retrievable blanking plug having a main body, means on said main body by which said plug can be placed in sealing engagement with the inside peripheral wall surface of the flow conduit; a lifting member connected to said main body for engagement with said fishing tool; anchor means including release means connected to said main body for releasably engaging the inside peripheral wall of the flow conduit so that the plug can be anchored therewithin; means forming an obstructed flow passageway through said main body; means on said fishing tool by which said obstructed flow passageway is made unobstructed when engaged by the last said means so that the pressure across the plug can be equalized when said fishing tool is placed in a first position of engagement with said lifting member; means connected to said fishing tool for causing said anchor means to be disengaged from the flow conduit when said fishing tool is placed in a second position of engagement with said lifting member; whereby said fishing tool can be positioned in said first position of engagement relative to said plug to enable the pressure across the plug to be equalized, whereupon said fishing tool can then be placed in the second position of engagement with said lifting member so that the plug is released from engagement with respect to the conduit, thereby enabling the fishing tool to lift the plug from the flow conduit.
Claim 8
Dependent Claim
260 words
In combination, a retrievable blanking plug and a wireline operated fishing tool for use in a flow conduit located within a borehole; said retrievable blanking plug having a main body, means on said main body by which said plug can be placed in sealing engagement with the inside peripheral wall surface of the flow conduit; a lifting member connected to said main body for engagement with said fishing tool; anchor means including release means connected to said main body for releasably engaging the inside peripheral wall of the flow conduit so that the plug can be anchored therewithin; means forming an obstructed flow passageway through said main body; means on said fishing tool by which said obstructed flow passageway is made unobstructed when engaged by the last said means so that the pressure across the plug can be equalized when said fishing tool is placed in a first position of engagement with said lifting member; means connected to said fishing tool for causing said anchor means to be disengaged from the flow conduit when said fishing tool is placed in a second position of engagement with said lifting member; whereby said fishing tool can be positioned in said first position of engagement relative to said plug to enable the pressure across the plug to be equalized, whereupon said fishing tool can then be placed in the second position of engagement with said lifting member so that the plug is released from engagement with respect to the conduit, thereby enabling the fishing tool to lift the plug from the flow conduit.
Claim 9
Dependent Claim
86 words
The improvement of claim 6 wherein said fishing tool is a wireline operated overshot having a skirt member located thereon; said skirt member has an expandable inwardly directed lower circumferentially extending edge portion; said lifting member being an enlargement about which said skirt member is received when the skirt member is telescopingly moved in a downward direction thereover so that the inwardly directed edge portion of the skirt can be latched onto the enlargement thereby enabling the fishing tool to lift the plug from the conduit.
Claim 10
Dependent Claim
39 words
The improvement of claim 7 wherein said fishing tool has a probe thereon and said pressure equalizing means include a combination stop and pressure equalizing means positioned to be contacted by said probe before the release means is retracted.
Claim 11
Dependent Claim
65 words
The improvement of claim 7 wherein said skirt member has an expandable inwardly directed lower circumferentially extending edge portion; said lifting member includes upper and lower members in the form of enlargements about which said skirt member is received when the skirt member is moved in a downward direction, so that the inwardly directed edge portion of the skirt can be latched onto the enlargements.
Claim 12
Dependent Claim
89 words
The improvement of claim 7 wherein said fishing tool includes a probe for providing said releasing means; said pressure equalizing means include a stop means, and further including a lower stop means positioned to be contacted by said probe before the release means is retracted; said lifting member includes an upper and lower enlargement about which said skirt member is received when the skirt member is moved in a downward direction, so that the inwardly directed edge portion of the skirt can be latched onto either of the enlargements.
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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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |