APRN testing valve requires high pressure stability in annulus, complicated nitrogen injection operation and
high maintenance cost for. This paper introduces a new large diameter and pressure controlled spring test valve. The energy storage mode of
“spring“group is adopted to adjust the compensation force by changing the number of “spring” group. The compensation force can be adjusted
with the different well depth of the valve. When the bottom hole pressure of annulus is higher than the compensation force, the transmission rod
will pull the ball valve to realize the pressure control switch of downhole testing valve. The ball valve can return to its original position
accurately in thousands of switching experiments indoor. The switch is normal when the pressure is stabilized for 60 min with the 40 MPa pressure.
The annulus of well PX4701 is connected with the pump truck, and the pump truck is pressurized for 7~15 MPa to conduct twice well opening testing.
During the second well opening, a weight bar of 35 mm is put on the steel wire rope to pass the testing valve, which achieve the predetermined
goal. The test valve has the function of large diameterof 40mm, which can meet the needs of various applications. The maintenance cost is low, the
operation is simple. This valve can meet the complex testing needs of horizontal wells, highly deviated wells and deep gas wells.