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Brief introduction：In middle drill string testing tool, connect pressure distributing valve between open hole packers. This kind of valve could adjust and distribute hydraustatic pressure between open hole packers and to every packer, which could avoid loss of seal cause of single packer could not bear testing differential pressure. The function is advantage for setting in unconsolidated layer or vertical fracture zone.
Structure feature：Pressure Distributing Valve is closed automatically when pressure sealed by packers is equal to determined operating pressure. Pressure Distributing Valve keeps closed in whole testing if testing reservoir pressure not higher than its operating pressure. |
