| 摘要 |
<p num="1"><br/>A method and apparatus for assembling a wellscreen (50) onto a perforated base <br/>pipe <br/>(52) are provided. The wellscreen defines a tubular body which is suitable for <br/><br/>subterranean use in oil, gas, and water wells. In accordance with the present <br/>invention, <br/>the wellscreen first defines a perforated base pipe having termination members <br/>(66) at its <br/>opposite ends. Disposed on each termination member is a continuous helical, <br/>step-tiered <br/>surface (72). The helical surface serves as a support surface for a layer of <br/>filtering <br/>material (74) which is rolled around the base pipe. The filtering material is <br/>pre-cut to a <br/>correct diameter and bias to match the diameters and bias of the spiralling <br/>termination <br/>support surfaces. The filtering material is connected to the rings to form a <br/>substantial <br/>seal on the opposite ends. A protective, perforated outer shroud is optionally <br/>disposed <br/>around the filtering media as well.<br/> |
