| 摘要 |
<p>A downhole tool suction screen assembly includes a top screen assembly adapter, a lower screen assembly adapter, and a tubular screen mandrel connected between the top and lower screen assembly adapters. A cylindrical pump screen is disposed about an outer surface of the screen mandrel. A flow tube is disposed concentrically within the screen mandrel. An inner mandrel is disposed concentrically within the flow tube. A seal mandrel engages upper ends of the inner mandrel and flow tube. The seal mandrel has a central bore communicated with an interior of the inner mandrel and has a longitudinal bore communicated with an annulus between the inner mandrel and the flow tube. The seal mandrel also includes a central outer cylindrical surface spaced radially inward from an inner surface of the upper screen assembly adapter. The seal mandrel includes first and second successively reduced diameter upwardly extending cylindrical outer surfaces which are connected by an upward facing shoulder. The seal mandrel further includes first and second successively reduced diameter downwardly extending cylindrical outer surfaces connected by a downward facing shoulder. The longitudinal bore of the seal mandrel communicates the upward and downward facing shoulders of the seal mandrel.</p> |
