5" 15000 PSI Downhole Select Tester Valve Full H2S Well Testing
Service
Introudction of DST Select tester valve
The select tester valve is the lock open tester valve with a full
opening design and operated by annulus pressure which is used drill
stem testing operation in cased holes. The tester valve is able to
take multiple downhole closures where pipe manipulation is
restricted, and the tool can be locked open and then
returned to the normal operating sequence at any time
The select tester valve is composed of four basic sections: ball
valve section, nitrogen section, upper hydraulic section, and the
metering section.
Features of the DST tester valve
* The select tester valve is able to lock the ball valve in the
open position at any point during the string
test operation
* With metal to metal seal for exceptional gas-holding capabilities
* The select tester valve made of Inconel alloy steel can work in
the Full H2S service
* The tool can be locked open to allow operation of other services,
including coil tubing, wire line,
slick line and well kill operations
Specification of the Select tester valve
| NO. | Specification | 5” |
| 1 | OD | 5” |
| 2 | ID | 2.25” |
| 3 | Length(mm) | 288.2” |
| 4 | Working pressure | 15000 PSI |
| 5 | Torque strength | 30.9kN.m |
| 6 | Service Environment | Full H2S service |
| 7 | End connection | 3 7/8CAS. BXP, 3 1/2 IF BXP |
| 8 | Service temperature | -20oF~450oF |
Operation of the tester valve
Under normal operating conditions the tool would be run in the well
in the closed position. Once the packer is set, pressure is applied
to the annulus to operate the tester valve.
The select tester valve has a spring loaded normally closed ball
valve. Spring force holds the valve in the closed position. By
applying additional pressure to the annulus, the tester valve is
opened and maintained open . When applied annulus pressure is
released, the ball valve will close. Fluid at hydrostatic pressure
is trapped behind the nitrogen chamber acting against a piston,
compressing the nitrogen to hydrostatic pressure. The nitrogen then
acts against the lower piston, the same hydrostatic pressure that
is acting against the lower piston is also passing through pressure
ports, located in the upper outer housing acting against the upper
piston. Both the upper and lower piston have the same
cross-sectional area, thus keeping the ball valve balanced.
Select tester valve metering
Techcore Oil Tools expertise in manufacture of the DST tools for
more than Ten years, the professional Reserch and Development
(R&D) department improves the advanced technology in design of
the downhole oil tools for well testing service and well completion
service.
We approach every client’s enquiry with meticulous attention to
technical specifications, and a high level of appreciation for
their urgency.
Welcome to contact us for more informaiton!
