Description:

The Non Equalizing Tester Valve (NETV 3035) can be used as an alternative to the Multi-Cycle Tester Valve (MCTV 3030). Both tools use an annulus pressure controlled ball valve to allow multiple cycles during cased hole testing and perforating.

Applications:

• Bottom- hole tubing shut in during drillstem testing and perforating operations
• Safety shut in valve for any situation where the workstring or tree connection develop an integrity problem
• Use in tandem with Multi Cycle Circulating Valve for fluid loss control
• Splined construction allows torque to be transmitted through the tool

Operation:

The NETV is a spring loaded normally closed ball valve. Spring force holds the valve in the closed position. It is opened and maintained open by applying pressure to the annulus. When applied pressure is released the ball valve will close. The NETV is a multi cycle tool that can accommodate infinite repeatability of cycling sequence.

To run the NETV effectively, the nitrogen chamber must be pressurized to an accurate estimate of the downhole hydrostatic pressure. This way when the tool is downhole the nitrogen pressure equals hydrostatic, balancing the pressure across the ball, and causing the spring force to be the only force holding the ball closed.

The NETV is a simple and cost effective alternative to the MCTV for testing wells that have lower pressures and are not extremely deep.