Multiple sample annulus pressure responsive sampler
A downhole sampling apparatus is described positioned within a well bore, on a tubing string containing an internal diameter, and the tubing string and well bore forming an annulus, the apparatus comprising: a cylindrical housing having a portion defining a first annulus port; a first power piston slidably disposed within said cylindrical housing movable between an initial position and a second position, said first power piston being responsive to an increase in the annulus pressure as communicated through said first annulus port to move said power piston from the initial position to the second position; a concentric housing disposed within said cylindrical housing and containing a plurality of tubing ports; means for biasing said first power piston so that as annulus pressure is released, said first power piston returns to the initial position; a first and second case located within said cylindrical housing, said first chamber case being exposed to tubing hydrostatic pressure and wherein said first case has contained therein oil and said second chamber case has contained air at atmospheric pressure; valve means, located between said atmospheric chamber case and said oil chamber case, for controlling flow of oil to the air chamber, said valve means having an open position and a closed position; valve activating means, operably associated with said first power piston, for supplying tubing hydrostatic pressure to said valve means so that said valve means is placed in the opened position; and means for sampling a portion of fluid contained within said tubing, string said sampling means being responsive to said valve means.
- Assignee:
- Halliburton Co., Duncan, OK (United States)
- Patent Number(s):
- US 5240072; A
- Application Number:
- PPN: US 7-765075
- OSTI ID:
- 6180189
- Country of Publication:
- United States
- Language:
- English
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