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.

Specification:

ZZ TOP OIL TOOLS is the professional manufacturer for the drill stem testing tools and surface testing equipment. All the DST tools are 

conformed with NACE MR 0175 with traceability,and the DST tools can be worked in H2S & CO2 above 175 F and full H2S, also with the skilled 

and experienced engineers, we can design the drill stem testing tools as per customer's well condition. Moreover, we supply the training in 

our factory and operation instruction at the well site. The DST tools are exported to USA, Colombia, India, Pakistan, Iran, Brazil etc. and 

enjoy the good reputation from the customers.

To shorten the delivery time, we proceeded the DST Tools in stock:

Packer,circualting valve,select tester valve,APR N-valve,OMNI valve,Hydraulic Jar,Tubing string tester

1. Full bore Packer, 7" Casing, working pressure 70Mpa, Working Temperature 400F, Connection: IF, 4set

2. Tester valve, 5", Working pressure 105Mpa, Working temperature 400F, Connection CAS. BXP, 4 sets

3. Hydraulic Jar,5", Working pressure 105Mpa, Working temperature 400F, Connection CAS. BXP, 4sets

4. Rupture disk Circulating valve, 5", Working pressure 105Mpa, Working temperature 400F, Connection CAS. BXP, 4sets

5. Flowhead (surface test tree), 3 1/16", working pressure 70 Mpa. 1set

Should you have any interest or inquiry on the Drill stem testing tools, contact us freely.

APR Downhole Tester Valve without lock-open Mode DST Tools

Downhole Tester Valve without lock open mode LPR-N Valve