초록 ▼

A method of manufacture of a long radial-flow filter particularly suitable for use as an input filter in a subterranean fluid (oil, gas, water) well starts with a length of multi-perforate pipe, which may be an integral part of the well 's production tubing. The pipe is mounted in an engine lathe wi

A method of manufacture of a long radial-flow filter particularly suitable for use as an input filter in a subterranean fluid (oil, gas, water) well starts with a length of multi-perforate pipe, which may be an integral part of the well 's production tubing. The pipe is mounted in an engine lathe with the perforated length between the headstock and the tailstock of the lathe. With the pipe rotating, a strip of metal (steel) wool is wrapped around the pipe in repeated, overlapping helical layers each aligned at an acute angle X to the pipe axis, with adjacent layers angularly displaced by 2X. The completed filter has a tubular wire mesh around the pipe, between the pipe and the innermost layer of steel wool, and a multi-perforate sheath over the outermost layer of wool.

대표청구항 ▼

[ I claim:] [1.] The method of manufacturing a radial-flow filter, suitable for use as an input filter for the production tubing of a subterranean fluid well, which production tubing has a predetermined outer diameter D, comprising the following steps:A. providing a preselected length L of a multi-p

[ I claim:] [1.] The method of manufacturing a radial-flow filter, suitable for use as an input filter for the production tubing of a subterranean fluid well, which production tubing has a predetermined outer diameter D, comprising the following steps:A. providing a preselected length L of a multi-perforate pipe having an outer diameter D1 corresponding to that of the production tubing for a subterranean fluid well, L being at least five feet (152 cm);B. mounting the length of multi-perforate pipe in a lathe with the length L of multi-perforate pipe between the headstock and the tailstock of the lathe;C. aligning a strip of metal fiber wool with the length of the metal wool strip at a given acute angle X to the axis of the multi-perforate pipe;D. affixing one end of the strip of metal fiber wool to one end of the length of pipe;E. actuating the lathe to rotate the pipe and simultaneously moving the strip of metal wool along a path parallel to the pipe from the one end of the pipe length L to the other so that the metal wool strip is wound in helical relation on the pipe, at the angle X, from one end of the length L of pipe to the other, while maintaining the metal wool strip under tension; andF. repeating and reversing step E to apply plural overlapping layers of metal wool to the exterior of the length L of pipe, with the strip forming alternate layers of metal wool angularly displaced from each other by an angle of 2X.