| 摘要 |
An apparatus (200) for coupling between opposing first and second portions (140, 150) of a downhole tool string (100). The apparatus includes a housing (260) having a port (620) therein, a shaft (270) extending within at least a portion of the housing, and a flow restrictor (630) reducing a flow area of the port. The housing and the shaft move axially relative to each other. The port fluidly connects a space external to the housing with an annulus (610) defined between the housing and the shaft. |
