Many pressure dominated testing valve is through pumping of relieving annulus pressure to realize open or shut down hole test valve and keep annulus pressure for certain all the time.

　
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  • 許多種壓控測試閥均是通過(guò)環(huán)空加泵壓打開(kāi),泄掉泵壓關(guān)閉,開(kāi)井過(guò)程中環(huán)空始終保持一定的開(kāi)啟壓力。
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