Apparatus for maintaining clean fluid in a chamber in a subterranean well tool

Patent · Tue Nov 24 04:00:00 EST 1987

OSTI ID:5820394

Salerni, J V; Donovan, J F

This patent describes a subterranean well tool suspendable in a well bore containing fluid on a well conduit defining an annulus between the exterior of the conduit and the well bore. The well tool defines a vertically extending internal chamber filled with a clean fluid having a specific gravity less than the well fluids contained in the annulus; means for subjecting the clean fluid to the fluid pressure of the annulus fluids comprising: annular conduit means communicating with the top portions of the vertically extending chamber and extending upwardly and defining an inverted U-shape annular passage. The inverted U-shaped annular passage has a downwardly directed annular passage communicating with the annulus; and pressure transmitting sealing means fixedly secured in the lower end of the downwardly directed passage and operative in the fixed position to transmit annulus fluid pressure to the clean fluid. The vertically extending chamber, the annular conduit means, and the inverted U-shaped annular passage may be filled with the clean fluid at the top of the well and the clean fluid in the chamber is uncontaminated by annulus fluids during insertion and residence of the tool in the well.

• Assignee: Baker Oil Tools, Inc., Orange, CA
• Patent Number(s): US 4708200
• OSTI ID: 5820394
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
CONTROL
DENSITY
DESIGN
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
DRILLING FLUIDS
DRILLS
EQUIPMENT
FLUIDS
NATURAL GAS WELLS
OIL WELLS
PHYSICAL PROPERTIES
PIPES
PRESSURE CONTROL
PURIFICATION
SEALS
SEPARATION EQUIPMENT
WELL DRILLING
WELLS