Many pressure dominated testing valve is through pumping of relieving annulus pressure to realize open or shut down holetest valve and keep annulus pressure for certain all the time.
许多种压控测试阀均是通过环空加泵压打开，泄掉泵压关闭，开井过程中环空始终保持一定的开启压力。
3
This hole is the beginning of our "miracle mile" holes 6-14, a challenging stretch that will test our entire membership!