US2118171A - Well screen - Google Patents

Description

y 1938; G. w. DARST' 2,118,171

WELL SCREEN Filed Nov. 24, 1936 11M In 1 1 ylllfisgmwl 2/ I 17 T012 5 /V 1/ {v 2 11 WQM A TTOFP/VE/ Patented May 24, 1938 UNITED STATES Ei i'i' FFIQE WELL SCREEN George W. Darst, San Jose, Calif.

Application November 24, 1936, Serial No. 112,521

1 Claim. (01. 166--5) The present invention relates particularly to Referring now more particularly to the drawthat type of screens used in deep well centrifugal ing, I show at i and 2 the inner and outer tubes pump installations, and for drainage purposes. of the screen, one fitting snugly within the other In the manufacture of well screens, where both as clearly shown in Figure 2.

5 economy and efliciency are highly important fac- In the outer tube 2 are punched any required 6 tors, it has been somewhat common practice to number or arrangement of holes as indicated at 3, build the screen of two thicknesses of sheet metal. these holes being clean cut to leave the tube This construction not only provides an extremely smooth on both the interior and exterior surface. low-priced screen, but also one that is strong and In the inner tube I are punched slots as 4. Each 1 difiicult to deform. In making this screen several slot 4 is disposed longitudinally of the tube and 10 different methods of perforating have been fclpunched outwardly from the. interior of the tube lowed, chief of which are the following. in such a manner, as with a chisel, to form lips In one method of perforating, both the inner as 5 lying within the confines oi the hole 3, and and outer tubes are perforated and then asnot projecting beyond the general outer surface sembled with the perforations registering. One of the outer tube. In forming the cuts 4 in this 5 of the principal objections to this method is that manner inner pockets as 5 are formed, these while the perforations may register perfectly when pockets having the advantages hereinafter set the two tubes are assembled, the rough handling forth.

of installation may move one tube relative to the A screen constructed in the manner described 21) other in such a manner as to partially or even cannot be rendered useless, or even partially so, wholly ofiset the perforations, and consequently by shifting of one tube relative to the other bedestroy or limit the efficiency of the screen. cause the outwardly projecting lips 5 effectually In another method the perforations in the outer prevent such movement, and the screen may be tube are made by punching outwardly with a readily'adjusted in a well because of its smooth 25 chisel thereby forming a slitted boss on the out exterior surface. 25

side which interferes with the positioning of the In this form of screen there are no protuberscreen. Furthermore, by this method pockets are ances or bulges on the exterior against which sand formed between the outer slits and the inner tube, can lodge and build up, but rather the movement and these pockets are prone to fill with sand and of both water and sand is rendered smooth and close off the flow of water. easy. This is due largely to the inwardly diverg- 0 It is, therefore, the object of my invention to ing walls of the lips 5 forming the flaring pockets provide a well screen of the type indicated that 6, whereby any material passing through theslots will not only be economical to manufacture, rigid, 4 passes away quickly and easily. strong, and hi hly efficient in its practical pp It is to be understood, of course, that while I cation, but also one that will not pack and close have shown the preferred form of my invention 35 with sand, wherein the flow of water can not be. various changes may be made without departing shut off through displacement of one tube relafrom the spirit of the invention.

tive to the other, and wherein the screen will I (31mm; present a smooth exterior surface with obvious A well screen comprising, a tubular member advantageous results. having slots disposed longitudinally thereof and 40 Othe Obj c and advantages W appe in punched outwardly from its inner side to form the following descripti n a d 111 the p ybosses on its outer surface, and a second tubular ing drawing, in which; member overlying and encompassing the first Figure 1 is a Side elevation of a portion of a well member having orifices formed therein enscreen embodying my invention. compassing said bosses. 45

Figure 2 is an enlarged section on line 2-2 of Figure 1. GEORGE W. DARSI.

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