Wireline releasing device
Patent
·
OSTI ID:7090813
This patent describes, in a wireline operation in a wellbore, a hydraulically operated wireline releasing apparatus for completely releasing the wireline from a downhole device suspended on the wireline. It comprises: a first portion for releasable connection to a wireline; a second portion for releasable connection to downhole tool; release means having at least one releasing element releasably connecting the first portion to the second portion. The release means holding the first portion and the second portion against relative movement to one another; means for applying a coupling force of a predetermined magnitude to the at least one releasing element to maintain the first portion and the second portion connected together against movement; and means operable in response to a change in hydrostatic pressure in the wellbore from the surface and communicated to the releasing apparatus in the wellbore for operating the release means to permit movement of the first portion and the second portion relative to one another.
- Assignee:
- Conoco Inc., Ponca City, OK
- Patent Number(s):
- US 4909321; A
- Application Number:
- PPN: US 7-290671A
- OSTI ID:
- 7090813
- Country of Publication:
- United States
- Language:
- English
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