| 摘要 |
<p>An improved seal assembly is shown for use in an oil well packer of the type having a packer body having a longitudinal bore, a packer carried on the body for sealing off the annular space between the body and a surrounding well conduit, a mandrel slidably disposed within the body longitudinal bore, the mandrel being spaced-apart from the body to define a fluid flow path between the mandrel exterior and the interior of the body, and wherein the mandrel is slidable between an open, running-in position in which the fluid flow path communicates the annular space above the packer with the mandrel longitudinal passageway and a closed, set-position in which the fluid flow path is sealed off. The improvement comprises a face seal housing as a part of the mandrel which has a weight loading shoulder and a deformable seal portion. The weight loading shoulder is engageable with the packer body when the mandrel is in the closed, set-position to thereby support the weight of the mandrel from the body. A pressure biased seal compressor is carried between the mandrel and the body for contacting the deformable seal portion when the mandrel is in the closed, set-position to seal off the fluid flow path. The weight loading shoulder supports the large compressive loads often encountered in service work without increasing the compressive stress on the deformable seal.</p> |
