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    • 12. 发明授权
    • Well perforating apparatus including an underbalancing valve
    • 良好的穿孔装置包括一个欠平衡阀
    • US4616701A
    • 1986-10-14
    • US742095
    • 1985-06-06
    • Gregg W. StoutWilliam D. Myers, Jr.
    • Gregg W. StoutWilliam D. Myers, Jr.
    • E21B43/116E21B43/1185
    • E21B43/11855E21B43/116
    • A well perforating apparatus includes an underbalancing valve for opening ports in a tubing string immediately subsequent to the firing of a perforating gun, and comprises a hollow conduit having at least one pair of axially aligned, and radial holes traversing the wall of the conduit. A frangible member has its end portions slidably and sealably mounted in such holes and is therefore disposed transversely to the path of a detonating bar which is dropped to initiate the firing of the perforating gun. Upon breakage of the frangible member, the ends of the bar are forced inwardly out of the holes by the fluid pressure differential existing between the interior and exterior of the conduit due to the underbalanced fluid pressure condition achieved in the tubing string prior to firing the perforating gun.
    • 一种穿孔良好的装置包括一个平衡阀,用于在紧随射孔枪的射击之后立即打开管柱中的端口,并且包括具有穿过管道壁的至少一对轴向对准和径向孔的中空导管。 易碎构件的端部可滑动地并可密封地安装在这些孔中,并因此被布置成与引爆杆的路径横向放置,以引起射孔枪的击发。 在易碎构件断裂时,由于在燃烧穿孔之前在管柱中实现的欠平衡流体压力条件,杆的端部被存在于管道的内部和外部之间的流体压力差向内压出孔 枪。