APR Downhole Tester Valve without lock-open Mode DST Tools

Product Description

Payment & Shipping Terms Supply Capacity
Unit Price: 600.0 USD Production Capacity: 10sets/month
Trade Term: FOB,CFR Packing: plywood
Payment Terms: L/C, T/T Delivery Date: 35days
Min. Order: 1 Set/Sets
Means of Transport: Ocean, Air, Land

APR Downhole Tester Valve without lock-open Mode DST Tools

Downhole Tester Valve without lock open mode LPR-N Valve

The LPR-N Tester Valve is a full-opening, annulus pressure-operated valve. It permits measuring 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 and bottomhole

temperature and pressure. As the LPR-N Tester Valve is run into the well, the ball valve can either set up to be in the

open or closed position. The power section controls the ball valve mechanism. The power section has a moving piston

with one side exposed to hydrostatic pressure and the other side exposed to pressurized nitrogen. After the packer has

been set, pressure is applied to the annulus, moving the piston downward to pull the ball into the open position.

Releasing annulus pressure allows the pressurized nitrogen to return the piston upward to close the ball valve.

The nitrogen chamber is charged at the surface to a predetermined pressure depending upon surface temperature,

bottomhole temperature, and hydrostatic pressure at testing depth. This charging pressure gives the tool the optimum

volume for compression in the nitrogen chamber when the tool arrives at testing depth. These values do not have to be

exact because the floating piston compensates for small inaccuracies Annulus pressure is transmitted to the nitrogen

chamber through the oil chamber and metering cartridge. As the tool is run in the hole, pressure enters

the tool through the lower annulus ports below the oil chamber. When the tool reaches the desired testing depth, there

will be less pressure in the nitrogen chamber than in the annulus. This creates a pressure differential across the

operating piston, which is acting to open the ball valve. For this reason, shear pins are needed to keep the ball valve in

the closed position until ready to test. The shear pins in the 5-in. tool have an approximate rating of 280 psi/pin.

Normally the tool is set up with four pins. To close the ball valve, the annulus pressure is released at a safe maximum

rate. This creates a differential across the operating piston due to the stored pressure in the nitrogen chamber. The

differential pressure moves the operating piston upward, rotating the ball to the closed position. After approximately

10 minutes, the nitrogen pressure has dropped to a level slightly higher than annulus hydrostatic, helping keep the ball

in the closed position.


Specifications 5″
OD 127.5mm
ID 57mm
Length 4940mm(3 1/2″IF BXP)
Working Pressure 105Mpa
Diff. pressure over ball valve 70Mpa
Diff. pressure to Ball valve open 35Mpa
Internal Yield Pressure strength(Bursting pressure) 140Mpa
External Yield Pressure strength (Collapse Pressure) 130Mpa
Tensile Strength(Yield) 1947KN
Torque Strength 61KN.m
Service environment Mud, Crude Oil, Natural gas NACE MR0175(>175F)
Service temperature –29oC~+204oC
End connections 3 7/8 CAS, 3 1/2″ IF