LPR-N Tester Valve

Drill Stem Testing Tools 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 bottom temperature. If the intended test requires a permanent packer that uses a stinger mandrel or seal nipple, a variety of bypass tools are available, depending on field application to help ensure that the formations and downhole equipment are protected from excessive pressure buildup.