Fluid sampling apparatus
The patent describes an apparatus for extracting virgin fluid from a selected formation of a subterranean well isolated by a pair of vertically spaced packing units, comprising: an outer tubular housing sealably connectable between the packing units to lie adjacent to the selected formation; at least one radial port in the wall of the outer tubular housing communicating with the well annulus between the outer tubular housing and the selected formation; a hollow mandrel slidably mounted within the tubular outer housing and defining an isolated annular sampling chamber in the annulus between the hollow mandrel and the bore of the outer tubular housing. The bore of the hollow mandrel is communicable with a surface source of fluid pressure; a valve sleeve shiftable mounted within the annulus adjacent the radial port; first sealing means on the exterior of the valve sleeve preventing communication between the radial port and the sampling chamber in the run-in position of the apparatus; means responsive to a first fluid pressure in the hollow mandrel for axially shifting the valve sleeve from the run-in position to a first position to open communication between the radial port and the sampling chamber; thereby permitting flow of virgin fluid from the selected formation into the sampling chamber; second sealing means on the valve sleeve operative in a second axial position of the valve sleeve to block communication between the radial port and the sampling chamber; and means responsive to a second higher fluid pressure in the hollow mandrel bore for further shifting the valve sleeve to the second position.
- Assignee:
- Baker Oil Tools, Inc., Orange, CA
- Patent Number(s):
- US 4721157
- OSTI ID:
- 5287731
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
CONTROL EQUIPMENT
DESIGN
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
FLUID MECHANICS
FLUIDS
HYDRAULICS
MECHANICS
NATURAL GAS WELLS
OIL WELLS
RESERVOIR FLUIDS
SAMPLERS
SAMPLING
SLEEVES
VALVES
WELLS