| 摘要 |
Embodiments of a filter assembly for use in down-hole applications generally include a drain filter, an inner layer of filter media, an outer layer of filter media, and a cover filter. The inner filter media includes a woven filter media spiral wrapped around the drain filter, with adjoining edges abutting, and the outer filter media includes a woven filter media spiral wrapped around the inner filter media, with adjoining edges abutting. Abutting edges of the second filter media are offset from the first filter media abutting edges. Embodiments of a method of constructing a filter assembly for use in down-hole applications generally include providing a drain filter by a wire wrap process, wrapping an inner filter media around the drain filter, wrapping an outer filter media around the inner filter media layer, and providing a cover filter by a wire wrap process, wherein abutting filter media layer edges are offset. |
