US5095993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anchor apparatus for a tubing and wireline conveyed method and apparatus
Assignee: Schlumberger Technology Corp
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Filing: 1990-11-20
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Granted: 1992-03-17
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Expires: 2010-11-20
Abstract
Abstract A new method of standalone perforating comprises the steps of lowering a perforator part-way into a borehole on a tubing string; when perforating is desired, connecting a wireline to the perforator; disconnecting the perforator from the tubing string; lowering the perforator into the borehole to the desired depth; attaching the perforator to the borehole casing or formation by setting an anchor on the perforator; disconnecting all wireline and associated apparatus from the perforator; withdrawing the wireline apparatus to the well surface; with the perforator standing alone in the well, firing the perforator into the surrounding formation; and dropping the perforator to the bottom of the well. A new apparatus for releasing the perforator from the tubing string includes a neutral release latch mechanism, and a new anchoring apparatus includes two interleaved coil springs having beveled shaped surfaces. Compression of an inner coil spring forces a radial expansion of an outer slip coil spring until the slip coil spring contacts the borehole wall and sets the anchor.
Inventors
- 👤 Klaus B. Huber
- 👤 Joe C. Hromas
- 👤 Arnold G. Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:53
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; E21B23/00; E21B23/01; E21B23/02; E21B23/14; E21B43/119; E21B43/1193; E21B17/00; E21B17/02; E21B17/028; E21B17/0283
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
195 words
An anchor apparatus for setting an anchor in a wall tool, comprising; a first helical member having helical turns; a second helical member interleaved with the turns of said first helical member, the second helical member including gripping means disposed on an outer periphery thereof for gripping a borehole casing; means for compressing said field helical member, said means for compressing including, a first pull mandrel, a second pull mandrel connected on one end to said first pull mandrel and on the other end to a bottom end of said first helical member, and means for pulling said first pull mandrel, the pull on said first pull mandrel producing a corresponding pull on said second pull mandrel, the pull on said second pull mandrel producing a corresponding pull on said bottom end of said first helical member, the pull on said bottom end compressing said first helical member, the second helical member expanding radially outwardly in response to the compression of said first helical member by said means for compressing until said gripping means of said second helical member grips said borehole casing, the anchor being set when said gripping means grips said borehole casing.
Claim 2
Dependent Claim
195 words
An anchor apparatus for setting an anchor in a wall tool, comprising; a first helical member having helical turns; a second helical member interleaved with the turns of said first helical member, the second helical member including gripping means disposed on an outer periphery thereof for gripping a borehole casing; means for compressing said field helical member, said means for compressing including, a first pull mandrel, a second pull mandrel connected on one end to said first pull mandrel and on the other end to a bottom end of said first helical member, and means for pulling said first pull mandrel, the pull on said first pull mandrel producing a corresponding pull on said second pull mandrel, the pull on said second pull mandrel producing a corresponding pull on said bottom end of said first helical member, the pull on said bottom end compressing said first helical member, the second helical member expanding radially outwardly in response to the compression of said first helical member by said means for compressing until said gripping means of said second helical member grips said borehole casing, the anchor being set when said gripping means grips said borehole casing.
Claim 3
Dependent Claim
14 words
The anchor of claim 1, wherein said first pull mandrel comprises first buttress teeth.
Claim 4
Dependent Claim
41 words
The anchor of claim 2, further comprising: a ratchet surrounding said first pull mandrel, said ratchet having second buttress teeth adapted to mate with said first buttress teeth of said first pull mandrel when said ratchet contacts said first pull mandrel.
Claim 5
Dependent Claim
49 words
The anchor of claim 3, wherein a load is produced on said second helical member when said gripping means grips said borehole casing, said means for pulling separating from said first pull mandrel when the pull on said means for pulling exceeds said load on said second helical member.
Claim 6
Dependent Claim
68 words
The anchor of claim 4, wherein said second buttress teeth of said ratchet firmly holds said first buttress teeth of said first pull mandrel when the means for pulling separates from said first pull mandrel, said anchor remaining set in response to the holding of said first buttress teeth by said second buttress teeth regardless of the separation of said means for pulling from said first pull mandrel.
Claim 7
Dependent Claim
80 words
The anchor of claim 5, further comprising: a release sleeve, the release sleeve adapted to be disposed between said second buttress teeth of said ratchet and said first buttress teeth of said first pull mandrel, the first helical member relaxing when said release sleeve is disposed between said second buttress teeth and said first buttress teeth, the second helical member relaxing when the first helical member relaxes, the anchor being released from said set when said second helical member relaxes.
Claim 8
Independent Claim
156 words
A method of setting an anchor in a well tool, said well tool adapted to be disposed in a borehole, said anchor including a first coil, a second coil interleaved with said first coil and including a gripping means disposed on the outer periphery thereof, a first pull mandrel, and a second pull mandrel connected on one end to said first pull mandrel and on the other end to a bottom end of said first coil, comprising the steps of: pulling said first pull mandrel; in response to the pulling step, producing a corresponding pull on said second pull mandrel; in response to the producing step, further producing a corresponding pull on said bottom end of said first coil thereby compressing said first coil; and radially expanding said second coil response to the compression of said first coil, the anchor being set when said gripping means on said second coil contacts a wall of said borehole.
Claim 9
Independent Claim
156 words
A method of setting an anchor in a well tool, said well tool adapted to be disposed in a borehole, said anchor including a first coil, a second coil interleaved with said first coil and including a gripping means disposed on the outer periphery thereof, a first pull mandrel, and a second pull mandrel connected on one end to said first pull mandrel and on the other end to a bottom end of said first coil, comprising the steps of: pulling said first pull mandrel; in response to the pulling step, producing a corresponding pull on said second pull mandrel; in response to the producing step, further producing a corresponding pull on said bottom end of said first coil thereby compressing said first coil; and radially expanding said second coil response to the compression of said first coil, the anchor being set when said gripping means on said second coil contacts a wall of said borehole.
Claim 10
Dependent Claim
159 words
An anchor apparatus for setting an anchor in a well tool, comprising: a first helical member having helical turns; a second helical member interleaved with the turns of said first helical member, the second helical member including gripping means disposed on an outer periphery thereof for gripping a borehole casing; means for compressing said first helical member, said means for compressing including, a pull mandrel connected to a bottom end of said first helical member, and means for pulling said pull mandrel, the pull on said pull mandrel producing a corresponding pull on said bottom end of said first helical member, the pull on said bottom end compressing said first helical member, the second helical member expanding radially outwardly in response to the compression of said first helical member by said means for compressing until said gripping means of said second helical member grips said borehole casing, the anchor being set when said gripping means grips said borehole casing.
Claim 11
Dependent Claim
159 words
An anchor apparatus for setting an anchor in a well tool, comprising: a first helical member having helical turns; a second helical member interleaved with the turns of said first helical member, the second helical member including gripping means disposed on an outer periphery thereof for gripping a borehole casing; means for compressing said first helical member, said means for compressing including, a pull mandrel connected to a bottom end of said first helical member, and means for pulling said pull mandrel, the pull on said pull mandrel producing a corresponding pull on said bottom end of said first helical member, the pull on said bottom end compressing said first helical member, the second helical member expanding radially outwardly in response to the compression of said first helical member by said means for compressing until said gripping means of said second helical member grips said borehole casing, the anchor being set when said gripping means grips said borehole casing.
References Cited (Backward Citations)
US2670797A
Cited
US3079177A
Cited
US4498534A
Cited
US4349072A
Cited
US4690214A
Cited
US4488595A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-17 | 1995-09-16 | 1996-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-17 | 1999-09-16 | 2000-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-17 | 2003-09-16 | 2004-03-17 | $7700.00 | Window Closed / Lapsed |