Drill Stem Testing Select Tester Valve Lock Open Tester Valve Well
Testing Service
Brief of Lock Open Tester Valve
The Lock Open Tester Valve is the kind of full bore tester valve,
which is an annulus pressure controlled to operate the ball valve.
During the cased hole testing and perforating operations, the lock
open tester valve is designed to allow multiple cycles .The tester
valve is fully balanced to annulus pressure and will be kept in the
closed position while tripping in hole.
Specification of the downhole tester valve
| Tool size /in | OD/ mm | ID/ mm | Working pressure / Mpa | Service environment | Working temperature | Connection |
| 5" | 127.5 | 57 | 105 | Mud, Crude Oil, Natural gas with H2S and acid | --29oC ~ +204oC | EUE IF CAS |
Application of the Lock Open Tester Valve
* Made of the alloy steel, the Lock Open Tester Valve is applied
for standard well testing operation, work in H2S above 175oF according to NACE MR0175.
* Made of the Inconel steel, the Lock Open Tester Valve is applied
for full H2S well testing operation.
* Tubing perforating opeation.
* Well flow testing operation.
Operation of the Lock Open Tester Valve
The lock open tester valve is designed with a spring loaded
normally closed ball valve.The spring force holds the ball valve in
the closed position, and the lock open tester valve is opened and
kept open by applying additional pressure to the annulus. When
applied annulus pressure is released, the ball valve will be
closed. 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
Techcore insist on the traceability of each Drill stem testing
tools and related DST parts from the raw
material to the finished products to meet on requirements of
onshore and offshore standards.
All the raw materila will be test by SGS at the thrid party testing
lab, SGS made the mark and keep the traceability of each DST tools
parts.
The drill stem testing tools are applied in cased hole, open hole
and slim hole, the main DST tool string includes RTTS packer,
circulating valve, safety joint, select tester valve, omni valve,
hydraulic jar, shock absorber, RD safety circulating valve, high
pressure retrievable packer with bypass, IPO valve, tubing string
test valve, and so on.
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 information!!
