| 摘要 |
A method and apparatus for assembling a wellscreen (50) onto a perforated ba se pipe (52) are provided. The wellscreen defines a tubular body which is suitable f or subterranean use in oil, gas, and water wells. In accordance with the presen t invention, the wellscreen first defines a perforated base pipe having termination membe rs (66) at its opposite ends. Disposed on each termination member is a continuous helical, step-tiered surface (72). The helical surface serves as a support surface for a layer of filtering material (74) which is rolled around the base pipe. The filtering material i s pre-cut to a correct diameter and bias to match the diameters and bias of the spiralling termination support surfaces. The filtering material is connected to the rings to form a substantial seal on the opposite ends. A protective, perforated outer shroud is optional ly disposed around the filtering media as well. |
