DST FUTURE Pressure Operated tester valve (LPR-N Valve)
Materiall:Alloy
Service:H2S, CO2
Standard:NACE MR0175
Operate:Full-opening, annulus press
DST Tools LPR-N Valve General:
The Pressure Operated tester valve (LPR-N Valve) is a full-
opening, annulus pressure-operated valve. It measures multiple
closed-in pressures in cased holes where pipe manipulation is
restricted and a full-opening string is required. The nitrogen
chamber is charged at the surface to a selected pressure determined
by surface temperature, bottomhole temperature, and bottomhole
pressure. If the intended test requires a permanent packer that
uses a stinger mandrel or seal nipple, a variety of ENOC bypass
tools are available, depending on field application, to help ensure
that the formations and downhole equipment are protected from
excessive pressure buildup.
Features and Benefits
• The ball valve operates independently of internal pressure
changes, such as with acidizing or fracturing operations.
• Advanced materials and processes provide a unique metal-to-metal
seat for exceptional gas-holding capabilities.
• The Pressure Poerated tester valve has been through an extensive
five-day qualification testing at 400°F and15,000 psi burst and
collapse pressures.
• An open-in feature allows the operator to run the Pressure
Poerated tester in the hole with the ball valve opened or closed.
• Fluids can be spotted or circulated through the PRESSURE POERATED
tester with the packer unseated.
A double nitrogen chamber can be added to the Pressure Poerated
tester for use in deep, hot, high-pressure wells to reduce the
operating pressure.
Operation
The Pressure Poerated tester valve is composed of a ball valve
section, a power section, and a metering section.
The ball valve section provides multiple downhole closures. It is
turned by operating arms. The power section has a floating piston
that is exposed to the hydrostatic pressure on one side and
pressurized nitrogen on the other side. With the packer set, pump
pressure applied to the annulus moves the piston downward,
activates the operating arms, and opens theball valve. When the
annulus pressure is released, pressurized nitrogen returns the
piston upward, closing the ball.
After the surface equipment is properly installed, the packer is
set, and the rams are closed, pressure is applied to the annulus,
using rig pumps to operate the Pressure Poerated tester.
Pictures