Pressure operated test valve

Patent · Tue Mar 25 04:00:00 EST 1986

OSTI ID:5911672

Reardon, D R

A pressure operated test valve is described for use in a well test string in a well bore, the test string having a packer arranged for sealing the well bore to isolate the annulus between the well bore and the test string above the packer from that portion of the well bore below the packer. The valve consists of: a rotating ball valve movable between open and closed positions relative to the interior of the test string; a ball piston for shifting the rotating ball between the open and closed positions; biasing means for urging the ball piston to its valve closing position; a power fluid reservoir containing a power fluid; an axially shiftable power valve located within a power chamber, the power valve having opposed piston faces exposed by means of fluid passageways to fluid in the power fluid reservoir; and an axially slidable control valve located within a control chamber, the control valve having a pressure responsive annular area exposed to the power fluid for shifting the control valve and having internal passages for supplying pressurized power fluid to a selected face of the power valve to shift the power valve between a first position which isolates the ball piston and a second position which exposes the ball piston to annulus fluid pressure for shifting the ball to the open position.

• Assignee: Hughes Tool Co., Houston, TX
• Patent Number(s): US 4577692
• OSTI ID: 5911672
• 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 EQUIPMENT
DESIGN
DRILL BITS
DRILL PIPES
DRILLING EQUIPMENT
EQUIPMENT
FLOW REGULATORS
MOTION
NATURAL GAS WELLS
OIL WELLS
PACKINGS
PIPES
PISTONS
POSITIONING
PRESSURIZING
ROTATION
TESTING
VALVES
WELLS