| 摘要 |
<p>A wireline supported mechanically operable packer device for use in a drill string casing and attached core drill bit raised off the bottom of a borehole and testing the formation below has a housing adapted to engage an arresting internal shoulder of the core drill bit. A hollow inner mandrel slideable in the housing has attached thereto a packer seal cup an O-ring seal expanded weight means and wireline means moveable between stops determining the extended and contracted positions thereof relative to the housing. Upon lowering the wireline and weight means that attached inner mandrel continues its downward movement relative to the arrested housing and toward the contracted, locked sealing position, and thereby actuates means locking the housing to the casing, ejects the initially contracted and stored packer seal from an end chamber of the housing whereupon it expands into sealing engagement with the borehole wall below and the expander means expands the O-ring against the internal surface of the casing. Fluid under pressure is then pumped through casing and inner mandrel to test formation after which the packer device can be retrieved and hoisted out by wireline whereby a reverse sequence of movements of the various elements occurs during return of the device to its initial extended unlocked nonsealing position.</p> |
